Publications
| Title | Abstract | Year Filter | PMID(sorted descending) Filter |
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| a comparison of the reproductive cycles of modiolus modiolus (l.), cerastoderma (=cardium) edule (l.), and mytilus edulis l. in strangford lough, northern ireland. | this paper examines the reproductive cycles of three ecologically important marine bivalves-modiolus modiolus (l.), cerastoderma edule (l.), and mytilus edulis l. in strangford lough, northern ireland over a period of almost five years.whilst modiolus does not appear to become sexually mature until it is several years old, mytilus and cerastoderma can reproduce in their first and second years of life respectively. in cerastoderma and modiolus sexual maturity is preceded by a period of rapid soma ... | 1977 | 28309431 |
| prey depletion and foraging strategy in the oystercatcher haematopus ostralegus. | the responses of a population of oystercatchers to their own depletion of their prey, the edible cockle cerastoderma edule, have been examined in strangford lough, northern ireland., cockle stocks were severely depleted each winter as a result of predation by oystercatchers and about half the birds present in october in the main study area had left by march: the reduction was greater when the initial population of oystercatchers was high than when it was low. oystercatchers were initially widesp ... | 1977 | 28309339 |
| amphidoma languida (amphidomatacea, dinophyceae) with a novel azaspiracid toxin profile identified as the cause of molluscan contamination at the atlantic coast of southern spain. | azaspiracids (aza) are a group of food poisoning phycotoxins that are known to accumulate in shellfish. they are produced by some species of the planktonic dinophycean taxon amphidomataceae. azaspiracids have been first discovered in ireland but are now reported in shellfish from numerous global sites thus showing a wide distribution. in shellfish samples collected in 2009 near huelva (spain), aza was also found along the andalusian atlantic coast for the first time. analysis using lc-ms/ms reve ... | 2017 | 28118886 |
| application of phage therapy during bivalve depuration improves escherichia coli decontamination. | the present study investigated the potential application of the bacteriophage (or phage) pht4a, eca2 and the phage cocktail pht4a/eca2 to decrease the concentration of escherichia coli during the depuration of natural and artificially contaminated cockles. depuration in static seawater at multiplicity of infection (moi) of 1 with single phage suspensions of pht4a and eca2 was the best condition, as it decreased by ∼2.0 log cfu/g the concentration of e. coli in artificially contaminated cockles a ... | 2017 | 27697159 |
| simulated leakage of high pco2 water negatively impacts bivalve dominated infaunal communities from the western baltic sea. | carbon capture and storage is promoted as a mitigation method counteracting the increase of atmospheric co2 levels. however, at this stage, environmental consequences of potential co2 leakage from sub-seabed storage sites are still largely unknown. in a 3-month-long mesocosm experiment, this study assessed the impact of elevated pco2 levels (1,500 to 24,400 μatm) on cerastoderma edule dominated benthic communities from the baltic sea. mortality of c. edule was significantly increased in the high ... | 2016 | 27538361 |
| digestive selection underlies differential utilization of phytoplankton and sedimentary organics by infaunal bivalves: experiments with cockles (cerastoderma edule) using cross-labelled mixed diets. | differential utilization of phytoplankton and detrital particles present in natural sediments of mud-flats was studied in a series of experiments performed on the infaunal bivalve cerastoderma edule. in order to assess digestive selection, parameters of food processing (organic ingestion rate: oir, gross absorption efficiency: gae and gut passage time: gpt) were recorded for each organic component in different combinations of food particles radio-labelled with (14)c. experimental design included ... | 2016 | 27494189 |
| widespread transmission of independent cancer lineages within multiple bivalve species. | most cancers arise from oncogenic changes in the genomes of somatic cells, and while the cells may migrate by metastasis, they remain within that single individual. natural transmission of cancer cells from one individual to another has been observed in two distinct cases in mammals (tasmanian devils and dogs), but these are generally considered to be rare exceptions in nature. the discovery of transmissible cancer in soft-shell clams (mya arenaria) suggested that this phenomenon might be more w ... | 2016 | 27338791 |
| impact of high pco2 on shell structure of the bivalve cerastoderma edule. | raised atmospheric emissions of carbon dioxide (co2) result in an increased ocean pco2 level and decreased carbonate saturation state. ocean acidification potentially represents a major threat to calcifying organisms, specifically mollusks. the present study focuses on the impact of elevated pco2 on shell microstructural and mechanical properties of the bivalve cerastoderma edule. the mollusks were collected from the baltic sea and kept in flow-through systems at six different pco2 levels from 9 ... | 2016 | 27285613 |
| understanding spatial distributions: negative density-dependence in prey causes predators to trade-off prey quantity with quality. | negative density-dependence is generally studied within a single trophic level, thereby neglecting its effect on higher trophic levels. the 'functional response' couples a predator's intake rate to prey density. most widespread is a type ii functional response, where intake rate increases asymptotically with prey density; this predicts the highest predator densities at the highest prey densities. in one of the most stringent tests of this generality to date, we measured density and quality of bi ... | 2016 | 27053747 |
| influence of intertidal recreational fisheries and 'bouchot' mussel culture on bivalve recruitment. | in coastal environments, fishing and aquaculture may be important sources of disturbance to ecosystem functioning, the quantification of which must be assessed to make them more sustainable. in the chausey archipelago, france, recreational fishing and commercial shellfish farming are the only two evident anthropogenic activities, dominated by bivalve hand-raking and 'bouchot' mussel culture, respectively. this study evaluates the impact of both activities on bivalve recruitment dynamics by compa ... | 2016 | 27039134 |
| propensity to metal accumulation and oxidative stress responses of two benthic species (cerastoderma edule and nephtys hombergii): are tolerance processes limiting their responsiveness? | the chronic exposure of benthic organisms to metals in sediments can lead to the development of tolerance mechanisms, thus diminishing their responsiveness. this study aims to evaluate the accumulation profiles of v, cr, co, ni, as, cd, pb and hg and antioxidant system responses of two benthic organisms (cerastoderma edule, bivalvia; nephtys hombergii, polychaeta). this approach will provide clarifications about the ability of each species to signalise metal contamination. organisms of both spec ... | 2016 | 26911481 |
| changes of paralytic shellfish toxins in gills and digestive glands of the cockle cerastoderma edule under post-bloom natural conditions. | concentrations of the paralytic shellfish toxins c1+2, c3+4, gtx5, gtx6, dcgtx2+3, dcstx, dcneo, gtx2+3, gtx1+4, stx and neo were determined by lc-fld in composite samples of digestive glands and gills of cerastoderma edule cockle. the specimens were sampled in aveiro lagoon, portugal, under natural depuration conditions (days 0, 8, 12, 14, 19, 21 and 25) after exposure to a bloom of gymnodinium catenatum. individual paralytic shellfish toxins indicated different pathways of elimination and biot ... | 2016 | 26874623 |
| long-term epidemiological study of disseminated neoplasia of cockles in galicia (nw spain): temporal patterns at individual and population levels, influence of environmental and cockle-based factors and lethality. | the dynamics of disseminated neoplasia (dn) affecting cockles cerastoderma edule (l.) in galicia was addressed at individual and population levels. early stage of dn was characterized by isolated neoplastic cells occurring in branchial vessels or in the connective tissue of gills, mantle, gonad or digestive gland. as disease progressed, the neoplastic cells appeared loose in foci and became widely distributed throughout the organs. in advanced stages, the connective tissue of most organs was inf ... | 2016 | 26813312 |
| prevalence and genetic diversity of human sapoviruses in shellfish from commercial production areas in galicia, spain. | the prevalence of human forms of sapovirus, an emerging pathogen of human gastroenteritis, was investigated in an 18-month survey from class b mollusc-harvesting areas in two galician rias (northwest spain). the detection and quantification of sapovirus was performed by reverse transcription-real-time pcr, according to the recently developed standard method iso/ts 15216-1:2013, and genotyping by reverse transcription-nested pcr. the bivalve species studied were wild and cultured mussels (mytilus ... | 2015 | 26655761 |
| accumulation of sellafield-derived radiocarbon ((14)c) in irish sea and west of scotland intertidal shells and sediments. | the nuclear energy industry produces radioactive waste at various stages of the fuel cycle. in the united kingdom, spent fuel is reprocessed at the sellafield facility in cumbria on the north west coast of england. waste generated at the site comprises a wide range of radionuclides including radiocarbon ((14)c) which is disposed of in various forms including highly soluble inorganic carbon within the low level liquid radioactive effluent, via pipelines into the irish sea. this (14)c is rapidly i ... | 2016 | 26555367 |
| natural selection by pulsed predation: survival of the thickest. | selective predation can lead to natural selection in prey populations and may alleviate competition among surviving individuals. the processes of selection and competition can have substantial effects on prey population dynamics, but are rarely studied simultaneously. moreover, field studies of predator-induced short-term selection pressures on prey populations are scarce. here we report measurements of density dependence in body composition in a bivalve prey (edible cockle, cerastoderma edule) ... | 2015 | 26378316 |
| taxonomic diversity and structure of the molluscan fauna in oualidia lagoon (moroccan atlantic coast). | the spatial distribution of the molluscan fauna of oualidia lagoon (moroccan atlantic coast) was studied during winter 2013. samples were collected from 43 stations over the whole of the lagoon. twenty-eight taxa (19 species of gastropods, 7 species of bivalves, 1 species of polyplacophora, and 1 species of cephalopod) were listed, 21 of which are newly reported for oualidia lagoon. four taxa, hydrobia sp. (78.29%), followed by abra alba (13.99 ), nassarius pfeifferi (5.07%), and cerastoderma ed ... | 2015 | 26231976 |
| trace element fingerprinting of cockle (cerastoderma edule) shells can reveal harvesting location in adjacent areas. | determining seafood geographic origin is critical for controlling its quality and safeguarding the interest of consumers. here, we use trace element fingerprinting (tef) of bivalve shells to discriminate the geographic origin of specimens. barium (ba), manganese (mn), magnesium (mg), strontium (sr) and lead (pb) were quantified in cockle shells (cerastoderma edule) captured with two fishing methods (by hand and by hand-raking) and from five adjacent fishing locations within an estuarine system ( ... | 2015 | 26149418 |
| potential use of fatty acid profiles of the adductor muscle of cockles (cerastoderma edule) for traceability of collection site. | geographic traceability of seafood is key for controlling its quality and safeguarding consumers' interest. the present study assessed if the fatty acid (fa) profile of the adductor muscle (am) of fresh cockles (cerastoderma edule) can be used to discriminate the origin of specimens collected in different bivalve capture/production areas legally defined within a coastal lagoon. results suggest that this biochemical approach holds the potential to trace sampling locations with a spatial resolutio ... | 2015 | 26084395 |
| mesocosm validation of the marine no effect concentration of dissolved copper derived from a species sensitivity distribution. | the predicted no effect concentration (pnec) for dissolved copper based on the species sensitivity distribution (ssd) of 24 marine single species tests was validated in marine mesocosms. to achieve this, the impact of actively maintained concentrations of dissolved copper on a marine benthic and planktonic community was studied in 18 outdoor 4.6m(3) mesocosms. five treatment levels, ranging from 2.9 to 31μg dissolved cu/l, were created in triplicate and maintained for 82days. clear effects were ... | 2015 | 25829294 |
| review: bucephalus minimus, a deleterious trematode parasite of cockles cerastoderma spp. | trematodes are the most prevalent and abundant macroparasites in coastal waters. they display a complex life cycle with alternation of free-living and parasitic stages generally involving three host species. the most deleterious stage is in the first intermediate host (a mollusc) where the parasite penetrates as miracidium larvae and asexually multiplicates in sporocysts/rediae to provide cercariae larvae. however, due to basic low prevalence in ecosystems, this system remains difficult to study ... | 2015 | 25681142 |
| profiles of paralytic shellfish toxins in bivalves of low and elevated toxicities following exposure to gymnodinium catenatum blooms in portuguese estuarine and coastal waters. | profiles of paralytic shellfish toxins (psts) were examined in 405 composite samples of mytilus spp., cerastoderma edule, donax trunculus and spisula solida collected between 2007 and 2012 from natural production areas in two estuaries (aveiro and mondego), two coastal lagoons (óbidos and formosa), and three open coastal areas (aguda, comporta and culatra). toxin concentrations were obtained from the biotoxin monitoring programme database. episodes of pst toxicity in portugal have been associate ... | 2015 | 25616737 |
| detection and quantification of hepatitis a virus and norovirus in spanish authorized shellfish harvesting areas. | an 18-month survey was conducted in ten class "b" harvesting areas from two galician rias (nw of spain), the most important bivalve production area in europe, to determine the prevalence of hepatitis a virus (hav) and human norovirus (nov), including genogroups i (gi) and ii (gii). quantification was performed by reverse transcription real-time pcr (rt-qpcr), according to the recently developed standard method iso/ts 15216-1:2013. four bivalve species were studied, including wild and cultured mu ... | 2015 | 25462922 |
| estimation of density-dependent mortality of juvenile bivalves in the wadden sea. | we investigated density-dependent mortality within the early months of life of the bivalves macoma balthica (baltic tellin) and cerastoderma edule (common cockle) in the wadden sea. mortality is thought to be density-dependent in juvenile bivalves, because there is no proportional relationship between the size of the reproductive adult stocks and the numbers of recruits for both species. it is not known however, when exactly density dependence in the pre-recruitment phase occurs and how prevalen ... | 2014 | 25105293 |
| disseminated neoplasia in the soft-shell clam mya arenaria: membrane lipid composition and functional parameters of circulating cells. | in a previous study we compared lipid composition and functional parameters of circulating cells from cerastoderma edule affected or not by disseminated neoplasia (neoplastic cells vs hemocytes) (le grand et al. chem phys lipids 167:9-20 2013). neoplastic cells presented morpho-functional modifications concomitant to striking membrane lipid alterations: the proportion of particular plasmalogen molecular species was drastically decreased. we wanted to test whether this pattern was representative ... | 2014 | 24934587 |
| cockle cerastoderma edule fishery collapse in the ría de arousa (galicia, nw spain) associated with the protistan parasite marteilia cochillia. | the highest shellfishery catch in galicia (nw spain) has traditionally been cockle cerastoderma edule. the shellfish bed located in lombos do ulla (ría de arousa) used to be among those with the highest cockle production; however, cockle mortality rate increased sharply in this bed in april 2012, reaching 100% in may 2012. salinity and temperature were discounted as potential causes of the mortality. marteiliosis, which was first detected in february 2012 and reached 100% prevalence in april 201 ... | 2014 | 24781796 |
| bmaa in shellfish from two portuguese transitional water bodies suggests the marine dinoflagellate gymnodinium catenatum as a potential bmaa source. | the neurotoxin β-n-methylamino-l-alanine (bmaa) and its putative role in multiple neurodegenerative diseases have been intensely studied since 2005 when the toxin was discovered to be produced by worldwide-distributed cyanobacterial species inhabiting terrestrial, marine, brackish, and freshwater ecosystems. recently, bmaa production was also associated with one eukaryotic group, namely, diatoms, raising questions about its production by other phytoplanktonic groups. to test for bmaa bioavailabi ... | 2014 | 24747603 |
| partitioning of paralytic shellfish toxins in sub-cellular fractions of the digestive gland of the cockle cerastoderma edule: changes under post-bloom natural conditions. | concentrations of paralytic shellfish toxins (c1+2, b1, dcgtx2+3, dcstx, gtx2+3 and stx) were determined by lc-fld in composite samples of digestive glands of the cockle cerastoderma edule and in each sub-cellular particulate fractions obtained after differential centrifugation (nuclei+debris, mitochondria, lysosomes and microsomes). the specimens were sampled during the exposure to a bloom of gymnodinium catenatum (day 0) and in the subsequent 8, 12, 14, 19, 21 and 25 days under natural depurat ... | 2014 | 24736027 |
| trematode communities in cockles (cerastoderma edule) of the ria de aveiro (portugal): influence of inorganic contamination. | this work aims to assess the trematode parasites infecting the edible cockle cerastoderma edule, collected in the ria de aveiro lagoon, one of the most relevant biodiversity hotspots of the western iberia, and evaluate the relationship between the observed patterns and environmental descriptors. a total of 11 of the 16 trematode species known to infect c. edule were identified, including himasthla continua and psilostomum brevicolle as new occurrences in this lagoon. parvatrema minutum was the m ... | 2014 | 24680719 |
| a mixed modeling approach to predict the effect of environmental modification on species distributions. | human infrastructures can modify ecosystems, thereby affecting the occurrence and spatial distribution of organisms, as well as ecosystem functionality. sustainable development requires the ability to predict responses of species to anthropogenic pressures. we investigated the large scale, long term effect of important human alterations of benthic habitats with an integrated approach combining engineering and ecological modelling. we focused our analysis on the oosterschelde basin (the netherlan ... | 2014 | 24586545 |
| perkinsus chesapeaki observed in a new host, the european common edible cockle cerastoderma edule, in the spanish mediterranean coast. | histological observations showed the presence of a perkinsus sp. parasite in cerastoderma edule tissues for the first time in the spanish mediterranean coast. its molecular characterization by pcr-rflp, in situ hybridization and sequencing, identified the parasite as perkinsus chesapeaki, with a maximum identity of 99-100% with genbank p. chesapeaki sequences from france and 97% with p. chesapeaki sequences of north american origin when blast analysis was carried out. furthermore, phylogenetic s ... | 2014 | 24525498 |
| limitations of metallothioneins in common cockles (cerastoderma edule) and sponges (haliclona oculata) as biomarkers of metal contamination in a semi-enclosed coastal area. | poole harbour is typical of many heavily anthropologically impacted semi-enclosed estuarine coastal areas under pressure from metal pollution across the world. this study examined the physiological significance of metal burdens within that sensitive area, and assessed the potential use of metallothionein (mt) concentrations in two organisms: the common cockle (cerastoderma edule) and the mermaid's glove sponge (haliclona oculata) for mapping the spatial extent of the biological response to metal ... | 2014 | 24378929 |
| ingestion and absorption of particles derived from different macrophyta in the cockle cerastoderma edule: effects of food ration. | we analyzed the capacity of the common cockle cerastoderma edule to utilize detrital food particles obtained from three different macrophytes: the vascular plant juncus maritimus and two green macroalgae (ulva lactuca and enteromorpha sp.). we measured feeding and digestive parameters at three concentrations of detritus (0.5, 1.0 and 3.0 mm(3) l(-1)), so that functional relationships between ingestive and digestive processes could be assessed. increasing concentrations of detritus (food) resulte ... | 2014 | 24178188 |
| assessing the spatial variability, level and source of organic chemical contaminants in bivalve fishing grounds on the galician coast (nw spain). | polychlorinated biphenyls, organochlorine pesticides, organotin compounds and triazines were quantified in sediments and bivalves collected in four areas on the galician coast. one or several species were analysed at each site depending on their availability, including mussels (mytilus galloprovincialis), cockles (cerastoderma edule), clams (venerupis pullastra and ruditapes decussatus) and razor shells (ensis siliqua). the general spatial distribution of contaminants was consistent in spite of ... | 2013 | 23849952 |
| cytomorphology and pcna expression pattern in bivalves mytilus galloprovincialis and cerastoderma edule with haemic neoplasia. | haemic neoplasia (hn) is a pathologic condition reported in several bivalve species in different geographic areas. in this study we describe the cytomorphological features and the proliferative behaviour, assessed by the proliferating cell nuclear antigen (pcna), of hn in common cockle cerastoderma edule and mediterranean mussel mytilus galloprovicialis. in mussels the presence of at least 5 types of atypical haemocytes was detected, including a- and b-type cells, previously described in m. edul ... | 2013 | 23836773 |
| conditional responses of benthic communities to interference from an intertidal bivalve. | habitat-modifying organisms that impact other organisms and local functioning are important in determining ecosystem resilience. however, it is often unclear how the outcome of interactions performed by key species varies depending on the spatial and temporal disturbance context which makes the prediction of disturbance-driven regime shifts difficult. we investigated the strength and generality of effects of the filter feeding cockle cerastoderma edule on its ambient intertidal benthic physical ... | 2013 | 23824689 |
| matrix solid-phase dispersion combined with gas chromatography-mass spectrometry for the determination of fifteen halogenated flame retardants in mollusks. | this study presents the development and validation of a new analytical method for the simultaneous determination of fifteen analytes classified as halogenated flame retardants (hfrs) - nine brominated diphenyl ethers (bdes) and six novel hfrs - in different kinds of mollusks using matrix solid-phase dispersion (mspd) followed by gas chromatography coupled to negative chemical ionization-mass spectrometry (gc-nci-ms). the proposed method is the first one developed for such a broad range of hfrs i ... | 2013 | 23809805 |
| cross-habitat interactions among bivalve species control community structure on intertidal flats. | increasing evidence shows that spatial interactions between sedentary organisms can structure communities and promote landscape complexity in many ecosystems. here we tested the hypothesis that reef-forming mussels (mytilus edulis l.), a dominant intertidal ecosystem engineer in the wadden sea, promote abundances of the burrowing bivalve cerastoderma edule l. (cockle) in neighboring habitats at relatively long distances coastward from mussel beds. field surveys within and around three mussel bed ... | 2013 | 23691667 |
| biomarkers and transcription levels of cancer-related genes in cockles cerastoderma edule from galicia (nw spain) with disseminated neoplasia. | disseminated neoplasia (dn) is a pathological condition reported for several species of marine bivalves throughout the world, but its aetiology has not yet been satisfactorily explained. it has been suggested that chemical contamination could be a factor contributing to neoplasia. the aim of the present study was to compare cell and tissue biomarkers and the transcription level of cancer-related genes in cockles (cerastoderma edule) affected by dn with those of healthy cockles in relation to che ... | 2013 | 23665240 |
| disseminated neoplasia causes changes in ploidy and apoptosis frequency in cockles cerastoderma edule. | a proliferative disease, usually referred as disseminated neoplasia (dn), shows high prevalence in some cockle cerastoderma edule beds of galicia (nw spain). chromosome counts, examination of chromosome morphology, dna quantification by flow cytometry and estimation of apoptosis frequency by tunel assay and flow cytometry were performed in cockles with different dn severity. metaphases obtained from gills of dn-affected cockles displayed a chromosome number ranging from 41 to 145, while normal n ... | 2013 | 23583807 |
| climate change impacts on potential recruitment in an ecosystem engineer. | climate variability and the rapid warming of seas undoubtedly have huge ramifications for biological processes such as reproduction. as such, gametogenesis and spawning were investigated at two sites over 200 km apart on the south coast of ireland in an ecosystem engineer, the common cockle, cerastoderma edule. both sites are classed as special areas of conservation (sacs), but are of different water quality. cerastoderma edule plays a significant biological role by recycling nutrients and affec ... | 2013 | 23532482 |
| statistical analysis of heavy metals in cerastoderma edule glaucum and venerupis aurea laeta from ganzirri lake, messina (italy). | our study was carried out on two species of clams, venerupis aurea laeta and cerastoderma edule glaucum, from ganzirri lake considered as "environmental biomarkers" for their changes in physiology, morphology or distribution under the influence of substances in the environment. the aim of the present study was to conduct a statistical analysis on venerupis and cerastoderma to investigate the difference between the two autochthonous clams according to the presence of metals, and to link metal con ... | 2013 | 23412955 |
| altered membrane lipid composition and functional parameters of circulating cells in cockles (cerastoderma edule) affected by disseminated neoplasia. | membrane lipid composition and morpho-functional parameters were investigated in circulating cells of the edible cockle (cerastoderma edule) affected by disseminated neoplasia (neoplastic cells) and compared to those from healthy cockles (hemocytes). membrane sterol levels, phospholipid (pl) class and subclass proportions and their respective fatty acid (fa) compositions were determined. morpho-functional parameters were evaluated through total hemocyte count (thc), mortality rate, phagocytosis ... | 2013 | 23333874 |
| mercury bioaccumulation and decontamination kinetics in the edible cockle cerastoderma edule. | mercury bioaccumulation and decontamination kinetics in the edible cockle cerastoderma edule were studied through a mesocosms experiment after a medium-term exposure to the metal. the results revealed that the bivalve presented distinct bioaccumulation kinetics according to the different tissues. while the gills showed a linear accumulation pattern, the digestive gland and the entire organism presented a saturation model, with higher accumulation during the first 7d of exposure and lower during ... | 2013 | 23141557 |
| metal contamination in water, sediment and biota from a semi-enclosed coastal area. | this study identifies and quantifies the spatial variations of metal contamination in water, sediment and biota: the common cockle (cerastoderma edule) and the mermaid's glove sponge (haliclona oculata), within a heavily anthropogenically impacted semi-enclosed estuarine-coastal area with a low ability to disperse and flush contaminants (poole harbour, uk). the results showed that metal contamination was detected in all environmental compartments. water was polluted with as, and hg sediment meta ... | 2013 | 23014922 |
| spatial variability of benthic-pelagic coupling in an estuary ecosystem: consequences for microphytobenthos resuspension phenomenon. | the high degree of physical factors in intertidal estuarine ecosystem increases material processing between benthic and pelagic compartments. in these ecosystems, microphytobenthos resuspension is a major phenomenon since its contribution to higher trophic levels can be highly significant. understanding the sediment and associated microphytobenthos resuspension and its fate in the water column is indispensable for measuring the food available to benthic and pelagic food webs. to identify and hie ... | 2012 | 22952910 |
| relative sensitivity of two marine bivalves for detection of genotoxic and cytotoxic effects: a field assessment in the tamar estuary, south west england. | the input of anthropogenic contaminants to the aquatic environment is a major concern for scientists, regulators and the public. this is especially relevant in areas such as the tamar valley in sw england, which has a legacy of contamination from industrial activity in the nineteenth and twentieth centuries. following on from previous laboratory validation studies, this study aimed to assess the relationship between genotoxic and cytotoxic responses and heavy metal concentrations in two bivalve ... | 2013 | 22890867 |
| are metallothioneins equally good biomarkers of metal and oxidative stress? | several researchers investigated the induction of metallothioneins (mts) in the presence of metals, namely cadmium (cd). fewer studies observed the induction of mts due to oxidizing agents, and literature comparing the sensitivity of mts to different stressors is even more scarce or even nonexistent. the role of mts in metal and oxidative stress and thus their use as a stress biomarker, remains to be clearly elucidated. to better understand the role of mts as a biomarker in cerastoderma edule, a ... | 2012 | 22854745 |
| physiological responses of the european cockle cerastoderma edule (bivalvia: cardidae) as indicators of coastal lagoon pollution. | physiological responses can be used as effective parameters to identify environmentally stressful conditions. in this study, physiology changes such as oxygen consumption, clearance rate, survival in air, condition index and energy reserves were measured on natural populations of cockles collected from different sites at ria de aveiro, portugal. at those sites, sediment samples were collected for hg concentration analysis. cockles were used for the evaluation of both the hg concentration and phy ... | 2012 | 22846762 |
| influence of disseminated neoplasia, trematode infections and gametogenesis on surfacing and mortality in the cockle cerastoderma edule. | cerastoderma edule is a widely distributed bivalve mollusc, commercially exploited throughout europe and is also an important food source for birds and crustaceans. recently, mass surfacing and mortalities of cockles have been observed and reported at sites in ireland and elsewhere, particularly in the summer months. one such site is flaxfort strand, courtmacsherry bay, county cork, ireland, an important feeding area used by many seabirds during the summer months. for the past few years large nu ... | 2012 | 22422131 |
| bivalve esterases as biomarker: identification and characterization in european cockles (cerastoderma edule). | this study characterized esterase activity in cerastoderma edule tissues using different substrates and specific inhibitors and identified the tissue distribution of esterases in this species. synthetic thiocholines and thioacetate esters and specific inhibitors (eserine, bw284c51 and iso-ompa) were used to identify and quantify cholines and carboxyl esterases. the results demonstrated the presence of a non-specific propionyl thiocholine (prsch)-cleaving cholinesterase (che) and a large amount o ... | 2012 | 22241547 |
| disseminated neoplasia in cockles cerastoderma edule: ultrastructural characterisation and effects on haemolymph cell parameters. | disseminated neoplasia (dn) has been detected in cockles from various beds in galicia (nw spain). a study was performed to characterise cockle neoplastic cell ultrastructure and to evaluate the effect of this disease at different severity stages on various haemolymph cell parameters. examination of cockle neoplastic cells with transmission electron microscopy (tem) showed round shapes and a lack of pseudopods, a high nucleus:cytoplasm diameter ratio, golgi complexes, abundant mitochondria, ribos ... | 2011 | 22013755 |
| quantitative determination of marine lipophilic toxins in mussels, oysters and cockles using liquid chromatography-mass spectrometry: inter-laboratory validation study. | thirteen laboratories participated in an inter-laboratory study to evaluate the method performance characteristics of a liquid chromatography-tandem mass spectrometric method (lc-ms/ms) for marine lipophilic shellfish toxins. method performance characteristics were evaluated for mussel (mytilus edulis), oyster (crassostrea gigas) and cockle (cerastoderma edule) matrices. the specific toxin analogues tested included okadaic acid (oa), dinophysistoxins-1 and -2 (dtx1, -2), azaspiracids-1, -2 and - ... | 2011 | 21995816 |
| cloning, characterization and gene expression of a metallothionein isoform in the edible cockle cerastoderma edule after cadmium or mercury exposure. | metallothionein (mt) genes encode crucial metal-binding proteins ubiquitously expressed in living organisms and which play important roles in homeostasis of essential metals and detoxification processes. here, the molecular organization of the first metallothionein gene of the edible cockle cerastoderma edule and its expression after cadmium (cd) or mercury (hg) exposures were determined. the resulting sequence (cemt1) exhibits unusual features. the full length cdna encodes a protein of 73 amino ... | 2012 | 21963253 |
| Looking for suitable biomarkers in benthic macroinvertebrates inhabiting coastal areas with low metal contamination: comparison between the bivalve Cerastoderma edule and the Polychaete Diopatra neapolitana. | Metals accumulated in marine sediments are often a threat to benthic communities. With the recognized importance and wide use of stress biochemical responses as indicators of metal contamination it becomes essential to compare these markers between different species and verify their ubiquity and accuracy. Using wild Diopatra neapolitana and Cerastoderma edule, collected at several areas differing in metal contamination, this study aimed to assess the use of these two macrobenthic species as sent ... | 2012 | 21890202 |
| comparison between two bivalve species as tools for the assessment of pollution levels in an estuarian environment. | estuaries are semi-enclosed marine areas with water short residence times. estuary ecosystems show a higher susceptibility to contamination, as historically these sites are linked to urban and industrial development. polycyclic aromatic hydrocarbons (pah) are ubiquitous contaminants present in high quantities in these marine environments. chemical analyses of sediments provides information regarding pah pollution levels but not a direct measure of the toxicological effects attributed to these co ... | 2011 | 21707426 |
| dynamics of bacterial communities in cockles (cerastoderma edule) with respect to trematode parasite (bucephalus minimus) infestation. | the bacterial communities associated with the cockle (cerastoderma edule) were investigated at the individual level through a 10-month monitoring programme. temporal changes and those changes associated with a common parasite of the cockle, bucephalus minimus, were investigated by monthly sampling of individuals, selected based on their shell length (cohort monitoring). cockle bacterial community abundance (cbca) and diversity (cbcd) were estimated by epifluorescence microscopy counts and automa ... | 2011 | 21584755 |
| norovirus, hepatitis a virus and enterovirus presence in shellfish from high quality harvesting areas in portugal. | this is the first report on the screening of shellfish from portugal for the presence of human enteropathogenic viruses. approximately 2000 shellfish (curbicula fluminea, ruditapes decussatus, tellina crassa, spisula solida, dosinia exoleta, ensis spp., mytilus spp., ostrea edulis and cerastoderma edule), organized in 49 batches, were collected between march 2008 and february 2009. they were tested for norovirus (nov), hepatitis a virus (hav) and enterovirus (ev) by rt-pcr followed by nucleotide ... | 2011 | 21569936 |
| health concerns of consuming cockles (cerastoderma edule l.) from a low contaminated coastal system. | commercial and recreational harvesting of shellfish within the coastal systems is usually very extensive. since these ecosystems are frequently subjected to contamination, namely from agricultural, urban and industrial activities, and shellfish generally display a high capacity to bioaccumulate metals, populations may be at risk in terms of toxic metal exposure as a consequence of the harvesting and ingestion of near shore coastal marine organisms. shellfish is regularly tested for concentration ... | 2011 | 21507485 |
| bioaccumulation surveillance in milford haven waterway. | biomonitoring of contaminants (metals, organotins, polyaromatic hydrocarbons (pahs), pcbs) was undertaken in milford haven waterway (mhw) and a reference site in the tywi estuary (st ishmael/ferryside) during 2007-2008. bioindicator species encompassed various uptake routes-fucus vesiculosus (dissolved contaminants); littorina littorea (grazer); mytilus edulis and cerastoderma edule (suspension feeders); and hediste (=nereis) diversicolor (sediments). differences in feeding and habitat preferenc ... | 2012 | 21432028 |
| comparison of antibacterial activity in the hemolymph of marine bivalves from galicia (nw spain). | a screening study of in vitro antibacterial activity was conducted in marine bivalves with economical importance and widespread along the coast of galicia (nw spain). hemocyte lysate supernatant (hls) and plasma of mytilus galloprovincialis, ostrea edulis, crassostrea gigas, ruditapes decussatus, ruditapes philippinarum, and cerastoderma edule were incubated with vibrio splendidus and micrococcus sp. hls and plasma for all the species demonstrated antibacterial activity, and c. edule had the hig ... | 2010 | 21134379 |
| source and impact of lead contamination on δ-aminolevulinic acid dehydratase activity in several marine bivalve species along the gulf of cadiz. | coastal areas and estuaries are particularly sensitive to metal contamination from anthropogenic sources and in the last few decades the study of space-time distribution and variation of metals has been extensively researched. the gulf of cadiz is no exception, with several rivers draining one of the largest concentrations of sulphide deposits in the world, the iberian pyrite belt (ipb). of these rivers, the guadiana, one of the most important in the iberian peninsula, together with smaller rive ... | 2010 | 20965582 |
| modelling shellfish growth with dynamic energy budget models: an application for cockles and mussels in the oosterschelde (southwest netherlands). | dynamic energy budget models for growth of individual cockles (cerastoderma edule) and mussels (mytilus edulis) are adjusted and calibrated to the oosterschelde by formulating and parametrizing their functional responses using an extensive set of field observations. the resulting model predictions fit the observations satisfactorily. results indicate that food quality and the importance of detritus as a food source are site-specific as well as species-specific. despite these differences in their ... | 2010 | 20921054 |
| expression of mutant protein p53 and hsp70 and hsp90 chaperones in cockles cerastoderma edule affected by neoplasia. | high prevalence of disseminated neoplasia has been found in cockles cerastoderma edule of galicia (nw spain). disseminated neoplasia has been associated with high mortalities of various bivalve species. in vertebrates, proteins such as p53 and heat shock proteins (hsps) play important roles in carcinogenesis. the protein p53 has been detected in neoplastic cells of bivalve molluscs such as mytilus edulis, mytilus trossulus, mya arenaria, spisula solidissima, crassostrea rhizophorae and crassostr ... | 2010 | 20815330 |
| evaluation of the potential of the common cockle (cerastoderma edule l.) for the ecological risk assessment of estuarine sediments: bioaccumulation and biomarkers. | common cockles (cerastoderma edule, l. 1758, bivalvia: cardiidae) were subjected to a laboratory assay with sediments collected from distinct sites of the sado estuary (portugal). cockles were obtained from a mariculture site of the sado estuary and exposed through 28-day, semi-static, assays to sediments collected from three sites of the estuary. sediments from these sites revealed different physico-chemical properties and levels of metals and organic contaminants, ranging from unimpacted (the ... | 2010 | 20717720 |
| morphological and molecular analysis of metacercariae of diphtherostomum brusinae (stossich, 1888) stossich, 1903 from a new bivalve host mytilus galloprovincialis. | the digenean trematode diphtherostomum brusinae (stossich, 1888) stossich, 1903 presents a complex life cycle that may involve more than one intermediate host. the present study represents the first description of the metacercariae from d. brusinae infecting the labial palps of a new intermediate host, mytilus galloprovincialis, in the aveiro estuary, portugal. the morphology of this parasitic stage was studied by light (lm) and scanning electron microscopy (sem) and some differences were report ... | 2010 | 20701832 |
| use of three bivalve species for biomonitoring a polluted estuarine environment. | estuaries are marine areas at great contamination risk due to their hydrodynamic features. pah are wide and ubiquitous contaminants with a high presence in these marine environments. chemical analysis of sediments can provide information, although it does not give a direct measure of the toxicological effect of such contaminants in the biota. samples of venerupis pullastra, cerastoderma edule, and mytilus galloprovincialis were collected from two locations in corcubión estuary (norhwest of spain ... | 2011 | 20686838 |
| the role of environmental variables in structuring landscape-scale species distributions in seafloor habitats. | ongoing statistical sophistication allows a shift from describing species' spatial distributions toward statistically disentangling the possible roles of environmental variables in shaping species distributions. based on a landscape-scale benthic survey in the dutch wadden sea, we show the merits of spatially explicit generalized estimating equations (gee). the intertidal macrozoobenthic species, macoma balthica, cerastoderma edule, marenzelleria viridis, scoloplos armiger, corophium volutator, ... | 2010 | 20583700 |
| population structure and growth rates at biogeographic extremes: a case study of the common cockle, cerastoderma edule (l.) in the barents sea. | a descriptive study of population structure, growth rates and shell morphometry was conducted on nine intertidal populations of the infaunal bivalve cerastoderma edule in the murmansk coast of the barents sea. year-to-year population dynamics was analyzed during 2002-2006 on a tidal flat dalniy plaj (eastern murmansk coast). the region constitutes the northern extremes of c. edule range where populations occupied the middle to low intertidal zone and were characterized by low densities. the dist ... | 2010 | 20347100 |
| prevalence, intensity, and aneuploidy patterns of disseminated neoplasia in cockles (cerastoderma edule) from arcachon bay: seasonal variation and position in sediment. | the present report presents the first evidence of disseminated neoplasia (dn) in cockles cerastoderma edule from arcachon bay (france). aneuploidy of neoplastic cells allowed the use of flow cytometry (fcm) to diagnose and stage dn. a 1year survey (2007) of the prevalence and intensity (% of aneuploid circulating cells in neoplastic cockles) was conducted. prevalences ranged from 2.2% (june) to 13.6% (may), and disease intensity ranged from 18.7% (june) to 95.5% (september). these percentages we ... | 2010 | 20159021 |
| temporal variation of meiogymnophallus minutus infections in the first and second intermediate host. | in order to study seasonal patterns of meiogymnophallus minutus infections in its intermediate hosts, bivalve samples were collected monthly between april 2008 and march 2009 from a high intertidal flat at courtmacsherry bay, ireland. infection rates in the first intermediate host scrobicularia plana did not fluctuate significantly with season. completely developed m. minutus cercariae appeared in daughter sporocysts from june and prevailed from july to october, indicating that transmission of m ... | 2010 | 20113534 |
| genotyping of hepatitis a virus detected in bivalve shellfish in galicia (nw spain). | hepatitis a virus (hav) represents a significant public health problem due to its high persistence in the environment and its transmission through contaminated water and food. bivalve shellfish are filter feeders that can bioaccumulate human pathogens found in contaminated waters, their consumption being a potential cause of hepatitis a outbreaks. in this work, cultured and wild bivalve shellfish from the ría de vigo (galicia, nw spain) were analysed for the presence and genotyping of hav. a tot ... | 2010 | 20057087 |
| short-term metallothionein inductions in the edible cockle cerastoderma edule after cadmium or mercury exposure: discrepancy between mrna and protein responses. | metallothioneins (mt) are essential metal binding proteins involved in metal homeostasis and detoxification in living organisms. numerous studies have focused on mt response to metal exposure and showed an important variability according to species, metal, concentration and time of exposure. in this study, the expression of one isoform of mt gene (cemt1) and associated mt protein synthesis were determined after 1, 3, 9, 24, 72 and 168h of cadmium (cd) or mercury (hg) exposures in gills of the co ... | 2010 | 20045202 |
| autochthonous clams monitoring of ganzirri lake (sicily). | two autochthonous clams, venerupis aurea laeta and cerastoderma edule/glaucum, collected for a period of 1 year, from may 2007 to january 2008, were studied in the cape peloro lagoon. on the samples, it was evaluated the presence of pathogenic microorganisms and proteins, lipids and yield edible part were determined. it was evaluated the concentration of mineral elements (cd, cu, mn, se, pb, zn) and organic contaminants (∑ddt and pcbs). salmonella is never present in any sample. total and faecal ... | 2010 | 20033279 |
| interactive effects of metal contamination and pathogenic organisms on the marine bivalve cerastoderma edule. | the present study evaluated the interactive effects of cadmium contamination and pathogenic organisms (trematodes himasthla elongata and bacteria vibrio tapetis) singularly and in combination during 7 days on the bivalve cerastoderma edule. some defense-related activities were analyzed such as genetic expression, metallothionein and immune responses. trematode metacercarial infection, similar whatever the treatment, induced the strongest responses of immune parameters. particularly, the interact ... | 2010 | 20031177 |
| profiles of fatty acids and 7-o-acyl okadaic acid esters in bivalves: can bacteria be involved in acyl esterification of okadaic acid? | the presence of 7-o-acyl okadaic acid (oa) esters was studied by lc-ms in the digestive glands of blue mussel (mytilus galloprovincialis) and common cockle (cerastoderma edule) from albufeira lagoon, located 20km south of lisbon. the profile of free and total fatty acids (fa) was analysed using a similar lc separation with a reversed phase c8 column and mass spectrometry detection. in mussel the free fa profile was reflected in the fa esterified to oa, being palmitic acid for instance the most a ... | 2010 | 19686865 |
| effect of some habitual cooking processes on the domoic acid concentration in the cockle (cerastoderma edule) and manila clam (ruditapes philippinarum). | the effect of cooking on the concentration and burden of domoic acid in two bivalve molluscs was studied. the manila clam (ruditapes philippinarum) and cockle (cerastoderma edule) were subjected to steaming and boiling, respectively. in both cases, factorial plans were used to evaluate the effects of common cooking methods and the variations likely to take place during the cooking procedure (cooking time and salt concentration in both species, in addition to ethanol percentage in manila clam). t ... | 2009 | 19680984 |
| brominated dioxins (pbdd/fs) and pbdes in marine shellfish in the uk. | the occurrence of brominated dioxins (pbdd/fs) and polybrominated diphenyl ethers (pbdes) was investigated in commonly consumed species of marine shellfish in the uk. individual samples of pacific oysters (crassostrea gigas), native oysters (ostrea edulis), mussels (mytilus edulis), scallops (pecten maximus), and cockles (cerastoderma edule) were collected from different coastal regions between 2006 and 2007. samples of a particular species from each site were composited and 60 samples were anal ... | 2009 | 19680967 |
| metabolites of saxitoxin analogues in bivalves contaminated by gymnodinium catenatum. | bivalve metabolites of saxitoxin analogues, not present in microalgae, were recently described as an important toxin fraction in mussels contaminated by alexandrium tamarense. these possess very low fluorescence, and require mass spectrometry detection. hilic-ms was implemented to look for these metabolites in bivalves contaminated during gymnodinium catenatum blooms at the portuguese coast. the presence of m1 was tentatively identified in several bivalves, ranging from estuarine (mytilus gallop ... | 2010 | 19622366 |
| intrapopulational distribution of meiogymnophallus minutus (digenea, gymnophallidae) infections in its first and second intermediate host. | host size and age are generally assumed to play a pivotal role in digenean trematode infection patterns, accounting for much of the variation found within intermediate host populations. however, knowledge is based on a limited number of studied host-parasite systems. we investigated the shell length class distribution of meiogymnophallus minutus infections within populations of the first intermediate host scrobicularia plana and second intermediate host cerastoderma edule. infections occurred ve ... | 2009 | 19575218 |
| diopatra neapolitana (polychaeta: onuphidae) as a second intermediate host of gymnophallus choledochus (digenea: gymnophallidae) in the aveiro estuary (portugal): distribution within the host and histopathology. | this is the first host record of gymnophallus choledochus metacercariae infecting the polychaete diopatra neapolitana in the aveiro estuary (portugal). the metacercariae were found unencysted, and their morphology is similar to that presented by metacercariae harbored by nereis diversicolor and cerastoderma edule, although they are larger in size. in d. neapolitana, the prevalence and mean intensity of the infection was very high, at 100% and 202 +/- 139 metacercariae per host, respectively, sug ... | 2009 | 19441876 |
| digenean trematodes-marine mollusc relationships: a stable isotope study. | the stable carbon and nitrogen isotopic composition of digenean trematode parasites and their marine mollusc hosts was investigated to describe the potential influence of parasites on their host and its different tissues, and to obtain further insight into their trophic relationships. four parasite-host systems were studied: labratrema minimus-cerastoderma edule, monorchis parvus-c. edule, lepocreadiidae parasites-nassarius reticulatus and zoogonidae parasites-n. reticulatus. among the 4 samplin ... | 2009 | 19419008 |
| morphological and molecular studies on life cycle stages of diphtherostomum brusinae (digenea: zoogonidae) from northern portugal. | diphtherostomum brusinae was first recorded by the present study in the north of portugal. sporocysts, containing cercariae and encysted metacercariae, were observed in the gonads and digestive gland of the gastropod nassarius reticulatus. metacercariae were also found infecting the foot, mantle border and gills of the cockle cerastoderma edule. the adult form was lodged in the rectum of the definitive host diplodus sargus. the morphology of the three parasitic stages was studied by light (lm) a ... | 2009 | 19265558 |
| distance decay of similarity among parasite communities of three marine invertebrate hosts. | the similarity in species composition between two communities generally decays as a function of increasing distance between them. parasite communities in vertebrate definitive hosts follow this pattern but the respective relationship in intermediate invertebrate hosts of parasites with complex life cycles is unknown. in intermediate hosts, parasite communities are affected not only by the varying vagility of their definitive hosts (dispersing infective propagules) but also by the necessary coinc ... | 2009 | 19189130 |
| oxidative stress responses in bivalves (scrobicularia plana, cerastoderma edule) from the oued souss estuary (morocco). | the aim of this work was to study the responses of oxidative-stress biomarkers (catalase: cat, thiobarbituric acid reactive substances: tbars) in bivalves (scrobicularia plana and cerastoderma edule) from the oued souss estuary (morocco). this estuary, subjected to large amounts of sewage discharges and industrial effluents, do not receive since november 2002 any waste outlets due to their connection to a wastewater purification plant. high cat and tbars values were recorded in both species coll ... | 2009 | 18995904 |
| the macrobenthic community along a mercury contamination in a temperate estuarine system (ria de aveiro, portugal). | mercury is a widely distributed environmental pollutant and a toxic element to all living organisms. this study represents an attempt to evaluate its correlation with the macrobenthic community structure in a temperate estuarine system, the ria de aveiro (portugal). the macrobenthic community structure showed significant differences along the mercury gradient. overall, the increase of mercury contamination was associated with reduced total abundance, lower species richness, and dominance of tole ... | 2008 | 18765161 |
| identification and description of bucephalus minimus (digenea: bucephalidae) life cycle in portugal: morphological, histopathological, and molecular data. | the cercaria of bucephalus minimus infects the digestive gland and gonads of its first intermediate host, the edible cockle, cerastoderma edule. light microscopy (lm) and scanning electron microscopy (sem) of the cercaria showed a tail formed by a central stem, with 2 long contractile arms presenting distinct morphological surfaces. the encysted metacercaria naturally infected the flathead grey mullet, mugil cephalus. the cysts found in the heart, liver, and spleen were shown to be identical by ... | 2009 | 18710298 |
| anaerobic survival potential of four bivalves from different habitats. a comparative survey. | a comparative survey of the anaerobic survival potential of four different bivalve species and the interference of associated bacteria has been carried out. individuals from both subtidal and intertidal environments were considered by selecting the following species: mytilus edulis (subtidal epifaunal), spisula subtruncata (subtidal infaunal), macoma balthica (intertidal infaunal) and cerastoderma edule (intertidal infaunal). anaerobiosis was simulated in the laboratory by subjecting individuals ... | 2008 | 18593601 |
| ambient fauna impairs parasite transmission in a marine parasite-host system. | to understand possible factors controlling transmission of trematode larvae between first and second intermediate hosts we examined the impact of ambient fauna on parasite transmission in a marine intertidal parasite-host association. cockle hosts (cerastoderma edule) kept together with selected co-occurring macrozoobenthic species in mesocosms acquired a lower parasite load compared to cockles kept alone, when targeted by cercariae of the trematode himasthla elongata. the reduction of parasite ... | 2008 | 18561867 |
| confirmation by lc-ms/ms of azaspiracids in shellfish from the portuguese north-western coast. | the search for azaspiracids (azas) in shellfish on the portuguese coast started in 2002, but the presence of these toxins could not be demonstrated until the summer of 2006. analysis by liquid-chromatography-tandem mass spectrometry (lc-ms/ms) allowed the confirmation of aza2 as a dominant compound, followed by aza1, in blue mussel (mytilus galloprovincialis), common cockle (cerastoderma edule), clams (venerupis senegalensis, ruditapes decussatus), razor clam (solen marginatus) and oyster (crass ... | 2008 | 18471847 |
| monitoring of trace metal contamination in the souss estuary (south morocco) using the clams cerastoderma edule and scrobicularia plana. | concentrations of seven metals (cd, cu, cr, pb, ni, zn, hg) were monitored monthly during 2 years in two bivalves, cerastoderma edule and scrobicularia plana collected from the souss estuary (south morocco) before and after the commissioning of a sewage treatment plant in november 2002. according to trace metals, changes in concentrations were observed mainly in s. plana, characterised by a decrease of cu, hg and pb when cd was clearly increasing. conversely, no clear changes were observed in c. ... | 2008 | 18292952 |
| the human alimentary tract transfer and body retention of environmental polonium-210. | this paper presents the results of a 4 year study to investigate the human alimentary tract transfer factor (f(a) value) and body retention of 210 po in shellfish. in the first 3 years, mussels (mytilus edulis l.), cockles (cerastoderma edule l.) and brown meat from crab (cancer pagurus l.) were successively studied. in each year five volunteers (from a pool of seven) ate a suitable portion of the shellfish and provided 24 h samples of excreta usually for 3 days before and for at least 7 days du ... | 2007 | 18268372 |
| effects of body-size and season on digestive organ size and the energy balance of cockles fed with a constant diet of phytoplankton. | seasonal variation in size-dependence of seawater clearance rate, absorption efficiency, oxygen consumption, gill area, length of the crystalline style and dry weight of digestive gland was analyzed in cockles cerastoderma edule from the mundaka estuary, spain. experimental determinations were performed monthly (from july 1998 to november 1999) in cockles being fed with tetraselmis suecica (organic content: 87.84 +/- 1.95%) at a concentration of 3 mm(3)/l for 3 days. analysis of covariance revea ... | 2008 | 18193430 |
| development and validation of a rapid headspace gas chromatography-mass spectrometry method for the determination of diethyl ether and acetone residues in tween extracts of shellfish intended for mouse bioassay for diarrhoetic toxins. | a validated analytical method using headspace capillary gas chromatography with mass spectrometric detection, which utilises deuterated analogues of the target analytes as internal standards has been developed and applied to the determination of acetone and diethyl ether in tween extracts of cockles (cerastoderma edule) and mussels (mytilus edulis) destined for mouse bioassay for lipophilic toxins. the optimal conditions for headspace incubation were 50 degrees c for 6 min. the limits of detecti ... | 2007 | 17499755 |
| effect of temperature on emergence, survival and infectivity of cercariae of the marine trematode renicola roscovita (digenea: renicolidae). | marine bivalves harbour a diversity of trematode parasites affecting population and community dynamics of their hosts. although ecologically and economically important, factors influencing transmission between first (snail) and second (bivalve) intermediate hosts have rarely been studied in marine systems. in laboratory experiments, the effect of temperature (10, 15, 20, 25 degrees c) was investigated on (1) emergence from snails, (2) survival outside hosts and (3) infectivity in second intermed ... | 2006 | 17240753 |
| shellfish dredging pushes a flexible avian top predator out of a marine protected area. | there is a widespread concern about the direct and indirect effects of industrial fisheries; this concern is particularly pertinent for so-called "marine protected areas" (mpas), which should be safeguarded by national and international law. the intertidal flats of the dutch wadden sea are a state nature monument and are protected under the ramsar convention and the european union's habitat and birds directives. until 2004, the dutch government granted permission for ~75% of the intertidal flats ... | 2006 | 17105350 |
| evidence of retroviral etiology for disseminated neoplasia in cockles (cerastoderma edule). | epizootiologic outbreaks of disseminated neoplasia have been reported in association with massive mortalities of various bivalve species. in cockles, cerastoderma edule, this pathological condition was described in ireland and france. since 1997, different populations affected by this pathology have been detected in galicia (nw spain). transmission electron microscopy allowed the visualization of virus-like particles in neoplastic cells, resembling a retrovirus-like agent. to confirm this hypoth ... | 2007 | 17092515 |
| habitat and transmission--effect of tidal level and upstream host density on metacercarial load in an intertidal bivalve. | transmission of parasites may be mediated by their habitat, consisting of abiotic and biotic components. i investigated the effect of 2 important habitat components in intertidal ecosystems, tidal level (abiotic) and density of upstream hosts (biotic), on the transmission of trematode cercariae to cockle (cerastoderma edule) hosts. a field survey showed no general trend in metacercarial loads of cockles regarding tidal level but species-dependent reactions. parasites originating from littorina l ... | 2007 | 17076926 |
| evidence of an altered protective effect of metallothioneins after cadmium exposure in the digenean parasite-infected cockle (cerastoderma edule). | the aim of the present study was to analyse the relation between parasitism and subsequent metallothioneins (mt) in the case of metal contamination. experimental exposure of parasitized and unparasitized cockles (cerastoderma edule) to cadmium (cd) was performed, with the cockle as first or second intermediate host of 2 digenean species. after 7 days of cd exposure in microcosms, cockles infected as first intermediate host by labratrema minimus exhibited metal concentrations in tissues double th ... | 2007 | 17032474 |
| spatial heterogeneity in parasite infections at different spatial scales in an intertidal bivalve. | spatial heterogeneities in the abundance of free-living organisms as well as in infection levels of their parasites are a common phenomenon, but knowledge on parasitism in invertebrate intermediate hosts in this respect is scarce. we investigated the spatial pattern of four dominant trematode species which utilize a common intertidal bivalve, the cockle cerastoderma edule, as second intermediate host in their life cycles. sampling of cockles from the same cohort at 15 sites in the northern wadde ... | 2007 | 17004055 |