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successful eradication of the european rabbit (oryctolagus cuniculus) and house mouse (mus musculus) from the island of selvagem grande (macaronesian archipelago), in the eastern atlantic.the portuguese island of selvagem grande (great salvage) in macaronesia is an important seabird breeding station in the eastern atlantic. significant populations of cory's shearwater calonectris diomedea (scopoli, 1769), bulwer's petrel bulweria bulweria (jardine & selby, 1828) and little shearwater puffinus assimilis baroli (bonaparte, 1857) are present, and white-faced storm-petrel pelagodroma marina (latham, 1790) and madeiran storm-petrel oceanodroma castro (harcourt, 1851) populations are o ...201021392324
[gasometric determination of carbon dioxide in carbano-apatites of calcified tissue].the determination of carbon dioxide in carbonato-apatites is carried out a new gasometric method. its application, in this paper, concerns the bones of skull and mandibles of cory's shearwater (calonectris diomedea borealis) and mallard (anas platyrhynchos). the results lead to appreciable differences between some organs of this two species.19911781603
buying years to extinction: is compensatory mitigation for marine bycatch a sufficient conservation measure for long-lived seabirds?along the lines of the 'polluter pays principle', it has recently been proposed that the local long-line fishing industry should fund eradication of terrestrial predators at seabird breeding colonies, as a compensatory measure for the bycatch caused by the fishing activity. the measure is economically sound, but a quantitative and reliable test of its biological efficacy has never been conducted. here, we investigated the demographic consequences of predator eradication for cory's shearwater cal ...200919279685
occurrence of halococcus spp. in the nostrils salt glands of the seabird calonectris diomedea.the nostrils of the seabird calonectris diomedea are endowed with a salt-excreting gland that could produce a suitable environment for the colonization of extreme halophilic prokaryotes. we have studied in this organ the presence of extreme halophiles by means of culturing techniques. we could easily cultivate members of haloarchaea, and all cultures studied were identified as members of one of the two species halococcus morrhuae and hcc. dombrowskii. in order to reveal the diversity of these co ...200919363644
the lévy flight foraging hypothesis in a pelagic seabird.lévy flight foraging represents an innovative paradigm for the analysis of animal random search by including models of heavy-tailed distribution of move length, which complements the correlated random walk paradigm that is founded on brownian walks. theory shows that the efficiency of the different foraging tactics is a function of prey abundance and dynamics with lévy flight being especially efficient in poor prey fields. lévy flights have been controversial in some quarters, because they previ ...201424102157
feather corticosterone of a nestling seabird reveals consequences of sex-specific parental investment.offspring of long-lived species should face costs of parental trade-offs that vary with overall energetic demands encountered by parents during breeding. if sex differences exist in how parents make the trade-off, sex-specific differences may exist in the contribution of each parent to those costs. adaptations of offspring facing such costs are not well understood, but the hormone corticosterone probably plays a role. we manipulated breeding effort in cory's shearwaters (calonectris diomedea) to ...201221632628
gps tracking for mapping seabird mortality induced by light pollution.light pollution and its consequences on ecosystems are increasing worldwide. knowledge on the threshold levels of light pollution at which significant ecological impacts emerge and the size of dark refuges to maintain natural nocturnal processes is crucial to mitigate its negative consequences. seabird fledglings are attracted by artificial lights when they leave their nest at night, causing high mortality. we used gps data-loggers to track the flights of cory's shearwater calonectris diomedea f ...201526035530
colony foundation in an oceanic seabird.seabirds are colonial vertebrates that despite their great potential for long-range dispersal and colonization are reluctant to establish in novel locations, often recruiting close to their natal colony. the foundation of colonies is therefore a rare event in most seabird species and little is known about the colonization process in this group. the cory's shearwater (calonectris diomedea) is a pelagic seabird that has recently established three new colonies in galicia (ne atlantic) thus expandin ...201626909694
mate vocal recognition in the scopoli's shearwater calonectris diomedea: do females and males share the same acoustic code?vocal recognition is an important process allowing partners' reunion in most seabirds. although the acoustic basis of this recognition has been explored in several species, only a few studies have experimentally tested the acoustic coding-decoding strategy used for mate identification. here, we investigated mate recognition in the scopoli's shearwater (calonectris diomedea) by conducting playbacks of calls with modified acoustic features. we showed that females and males in a seabird species wit ...201627126987
climate-driven vital rates do not always mean climate-driven population.current climatic changes have increased the need to forecast population responses to climate variability. a common approach to address this question is through models that project current population state using the functional relationship between demographic rates and climatic variables. we argue that this approach can lead to erroneous conclusions when interpopulation dispersal is not considered. we found that immigration can release the population from climate-driven trajectories even when loc ...201627279167
relative abundance and distribution of fisheries influence risk of seabird bycatch.fisheries provide an abundant and predictable food source for many pelagic seabirds through discards, but also pose a major threat to them through bycatch, threatening their populations worldwide. the reform of the european common fisheries policy (cfp), which intends to ban discards through the landing obligation of all catches, may force seabirds to seek alternative food sources, such as baited hooks from longlines, increasing bycatch rates. to test this hypothesis we performed a combined anal ...201627876852
the attendance cycles of the cory's shearwater calonectris diomedea borealis on selvagem grande.in the cory's shearwater calonectris diomedea borealis of selvagem grande (30 degrees 09'n, 15 degrees 52'w), the visits the birds pay to their colonies are cyclic throughout the breeding period. the number of visitors varies regularly between a minimum and a maximum following a sinusoid, the half-period of which is 4.8 +/- 1.5 d (2-8 d). no variation exists according to the status of the birds (breeders or non-breeders) or to the stage of the breeding cycle (pre-egg, incubation or chick rearing ...200010803350
geographic assignment of seabirds to their origin: combining morphologic, genetic, and biogeochemical analyses.longline fisheries, oil spills, and offshore wind farms are some of the major threats increasing seabird mortality at sea, but the impact of these threats on specific populations has been difficult to determine so far. we tested the use of molecular markers, morphometric measures, and stable isotope (delta15n and delta13c) and trace element concentrations in the first primary feather (grown at the end of the breeding period) to assign the geographic origin of calonectris shearwaters. overall, we ...200717708223
plastic debris in mediterranean seabirds.plastic debris is often ingested by marine predators and can cause health disorders and even death. we present the first assessment of plastic ingestion in mediterranean seabirds. we quantified and measured plastics accumulated in the stomach of 171 birds from 9 species accidentally caught by longliners in the western mediterranean from 2003 to 2010. cory's shearwaters (calonectris diomedea) showed the highest occurrence (94%) and large numbers of small plastic particles per affected bird (on av ...201324449923
relationships between heavy metal and metallothionein concentrations in lesser black-backed gulls, larus fuscus, and cory's shearwater, calonectris diomedea.metallothionein, cadmium, zinc, copper, and mercury concentrations were measured in adult lesser black-backed gulls, larus fuscus; and metallothionein, cadmium, zinc, and copper concentrations were measured in fledgling cory's shearwaters, calonectris diomedea. in gulls, metallothionein was positively correlated with cadmium (kidney r = 0.83, liver r = 0.46), zinc (kidney r = 0.46, liver r = 0.37), and copper (kidney r = 0.28, liver r = 0.34). mercury levels in lesser black-backed gulls showed n ...19968854964
an holistic ecological analysis of the diet of cory's shearwaters using prey morphological characters and dna barcoding.knowledge of the dietary choices and trophic niches of organisms is the key to understanding their roles in ecosystems. in seabird diet studies, prey identification is a difficult challenge, often yielding results with technique-specific biases. additionally, sampling efforts are often not extensive enough to reveal intrapopulational variation. immature animals, which may constitute up to 50% of a population, may occupy a significantly different trophic niche to more experienced birds, but this ...201424806079
oxidative stress predicts long-term resight probability and reproductive success in scopoli's shearwater (calonectris diomedea).a major challenge in conservation physiology is to find out biomarkers that reliably reflect individual variation in wear and tear. recent work has suggested that biomarkers of oxidative stress may provide an additional tool to assess the health state of individuals and to predict fitness perspectives. in this study, we assessed whether three biomarkers of plasma oxidative status predicted the following factors: (i) the resight probability as breeder in the next seasons; and (ii) the cumulative ...201527293709
effect of exotic mammalian predators on parasites of cory's shearwater: ecological effect on population health and breeding success.predator activity around the nests induces stress in breeding birds, which may have weaker immunity and are therefore more susceptible to parasite infections. the influence of predators on parasites has only been observed in land birds, and most studies are experimental. as seabird colonies offer excellent conditions for parasites, here we assess the influence of mouse, rat, and cat activity on parasites in cory's shearwater (calonectris diomedea borealis). adults were examined for blood parasit ...201323708397
olfaction and topography, but not magnetic cues, control navigation in a pelagic seabird: displacements with shearwaters in the mediterranean sea.pelagic seabirds wander the open oceans then return accurately to their habitual nest-sites. we investigated the effects of sensory manipulation on oceanic navigation in scopoli's shearwaters (calonectris diomedea) breeding at pianosa island (italy), by displacing them 400 km from their colony and tracking them. a recent experiment on atlantic shearwaters (cory's shearwater, calonectris borealis) breeding in the azores indicated a crucial role of olfaction over the open ocean, but left open the ...201526548946
olfactory foraging in temperate waters: sensitivity to dimethylsulphide of shearwaters in the atlantic ocean and mediterranean sea.many procellariiforms use olfactory cues to locate food patches over the seemingly featureless ocean surface. in particular, some of them are able to detect and are attracted by dimethylsulphide (dms), a volatile compound naturally occurring over worldwide oceans in correspondence with productive feeding areas. however, current knowledge is restricted to sub-antarctic species and to only one study realized under natural conditions at sea. here, for the first time, we investigated the response to ...201424526721
how important are seabirds in the diet of black rats on islands with a superpredator?this study assessed the impact of introduced black rats (rattus rattus) on cory's shearwater (calonectris diomedea borealis) in a multi-invaded insular ecosystem where rats are mesopredators. we hypothesized that black rats should have little impact on cory's shearwaters in the presence of cats as superpredators. stomach contents and stable isotope analysis (sia) in tissues of black rats were analyzed to assess the trophic ecology and the importance of cory's shearwater in their diet. we also st ...201424726532
population structure and dispersal patterns within and between atlantic and mediterranean populations of a large-range pelagic seabird.dispersal is critically linked to the demographic and evolutionary trajectories of populations, but in most seabird species it may be difficult to estimate. using molecular tools, we explored population structure and the spatial dispersal pattern of a highly pelagic but philopatric seabird, the cory's shearwater calonectris diomedea. microsatellite fragments were analysed from samples collected across almost the entire breeding range of the species. to help disentangle the taxonomic status of th ...201323950986
pelagic seabird flight patterns are consistent with a reliance on olfactory maps for oceanic navigation.homing studies have provided tantalizing evidence that the remarkable ability of shearwaters (procellariiformes) to pinpoint their breeding colony after crossing vast expanses of featureless open ocean can be attributed to their assembling cognitive maps of wind-borne odours but crucially, it has not been tested whether olfactory cues are actually used as a system for navigation. obtaining statistically important samples of wild birds for use in experimental approaches is, however, impossible be ...201526136443
eleven polymorphic microsatellite markers in cory's shearwater, calonectris diomedea, and cross-species amplification on threatened procellariiformes.for the first time, we describe 11 variable dinucleotide microsatellites and the conditions for multiplexing and simultaneous genotyping sets of loci in cory's shearwater, calonectris diomedea. microsatellite variability was assessed in a colony from the azores archipelago (atlantic ocean). two to eight alleles were detected per locus, the mean gene diversity being 4.5. cross-species amplification in three other seabirds (diomedea exulans, procellaria aequinoctialis and bulweria bulwerii) reveal ...200821585845
carry-over effects from breeding modulate the annual cycle of a long-distance migrant: an experimental demonstration.carry-over effects relate to events or processes that influence individual performance in a subsequent season, but their occurrence in the annual cycle of migratory avian taxa is seldom studied. we investigated if different levels of resource allocation to reproduction may result in carry-over effects that change the timing and destination of long-distance migration. we reduced the parental investment of cory's shearwaters calonectris diomedea by removing their chick at an early stage. when comp ...201323923482
do seabirds differ from other migrants in their travel arrangements? on route strategies of cory's shearwater during its trans-equatorial journey.long-distance migrants have developed diverse strategies to deal with the challenges imposed by their annual journeys. these are relatively well studied in some avian groups, such as passerines, shorebirds and raptors. in contrast, few studies have addressed the migratory behaviour of pelagic birds in the light of current theories of optimal migration. using a dataset of 100 complete migratory tracks gathered along four years, we performed a detailed study on the migratory strategy of a pelagic ...201223145168
ocean surface winds drive dynamics of transoceanic aerial movements.global wind patterns influence dispersal and migration processes of aerial organisms, propagules and particles, which ultimately could determine the dynamics of colonizations, invasions or spread of pathogens. however, studying how wind-mediated movements actually happen has been hampered so far by the lack of high resolution global wind data as well as the impossibility to track aerial movements. using concurrent data on winds and actual pathways of a tracked seabird, here we show that oceanic ...200818698354
contrasting effects of climatic variability on the demography of a trans-equatorial migratory seabird.large-scale seasonal climatic indices, such as the north atlantic oscillation (nao) index or the southern oscillation index (soi), account for major variations in weather and climate around the world and may influence population dynamics in many organisms. however, assessing the extent of climate impacts on species and their life-history traits requires reliable quantitative statistical approaches. we used a new analytical tool in mark-recapture, the multi-event modelling, to simultaneously asse ...201322823099
combined spatio-temporal impacts of climate and longline fisheries on the survival of a trans-equatorial marine migrant.predicting the impact of human activities and their derivable consequences, such as global warming or direct wildlife mortality, is increasingly relevant in our changing world. due to their particular life history traits, long-lived migrants are amongst the most endangered and sensitive group of animals to these harming effects. our ability to identify and quantify such anthropogenic threats in both breeding and wintering grounds is, therefore, of key importance in the field of conservation biol ...201222815833
high prevalence of parental delivery of plastic debris in cory's shearwaters (calonectris diomedea).plastic ingestion by adult procellariiformes has been widely recorded, but few studies have evaluated intergenerational transfer. we assessed the prevalence of plastic particles, as well as their basic characteristics, in the gut content of dead cory's shearwater fledglings stranded by light pollution on canary islands. eighty-three percent of birds were affected, containing on average 8.0 plastic pieces per bird. the average plastic weight per bird was low (2.97±3.97mg) compared with other petr ...201222784377
different means to the same end: long-distance migrant seabirds from two colonies differ in behaviour, despite common wintering grounds.although seabirds that are trans-equatorial migrants show apparently broad overlap among populations in the non-breeding season, such large-scale pattern may conceal subtle but nevertheless key differences in migratory behaviour. these specializations could reflect adaptation to different environments during the breeding season, carry-over effects from the breeding to the nonbreeding period, or asymmetries in competitive ability of birds of different origin. we compared the migratory and winteri ...201122022513
studying the reproductive skipping behavior in long-lived birds by adding nest inspection to individual-based data.the frequency at which individuals breed is an important parameter in population, as well as in evolutionary, studies. however, when nonbreeding individuals are absent from the study area, the reproductive skipping is usually confounded with a recapture failure and cannot be estimated directly. yet, there are situations in which external information may help to estimate reproductive skipping. such a situation is found with nest-tenacious birds: the fact that an individual is not encountered in i ...201121563585
linking isotopic and migratory patterns in a pelagic seabird.the value of stable isotope analysis in tracking animal migrations in marine environments is poorly understood, mainly due to insufficient knowledge of isotopic integration into animal tissues within distinct water masses. we investigated isotopic and moult patterns in cory's shearwaters to assess the integration of different stable isotopes into feathers in relation to the birds' transoceanic movements. specimens of mediterranean cory's shearwater calonectris diomedea diomedea caught accidental ...200919194727
sexual dimorphism in bill morphology and feeding ecology in cory's shearwater (calonectris diomedea).the bill is a sexually dimorphic structure in many bird species and implicated in numerous functions. sexual differences may arise from sexual selection or ecological divergence. here, we examined differences in bill size and shape between males and females and explored to what extent these relate to feeding ecology of each sex in cory's shearwater (calonectris diomedea). we applied linear measurements and geometric morphometric methods to examine sexual differences in bill size and shape. we in ...200918950998
yelkouan shearwater nest-cavity selection and breeding success.we describe, for the first time, nest-cavities selected by the mediterranean endemic yelkouan shearwater puffinus yelkouan on french islands, comparing it with the sympatric cory's shearwater calonectris diomedea. by monitoring 179 suitable cavities during four years, we show that yelkouan shearwaters select deeper cavities and with more winding tunnels than those selected by cory's shearwaters or unoccupied cavities. logistic regression modelling indicates that cavities with nest-like character ...200717434114
experimental increase of flying costs in a pelagic seabird: effects on foraging strategies, nutritional state and chick condition.a central point in life history theory is that parental investment in current reproduction should be balanced by the costs in terms of residual reproductive value. long-lived seabirds are considered fixed investors, that is, parents fix a specific level of investment in their current reproduction independent to the breeding requirements. we tested this hypothesis analysing the consequences of an experimental increase in flying costs on the foraging ecology, body condition and chick condition in ...200717124570
food provisioning to nestling shearwaters: why parental behaviour should be monitored?we examined temporal variation in food delivery to nestling cory's shearwaters calonectris diomedea, by repeated periodic weighings during the night. we tested whether the magnitude and frequency of meals were influenced by the condition of chicks. in contrast to previous studies of chick provisioning in petrels and shearwaters, the evidence of feeding derived from chick weight gains was complemented by data provided by an electronic system, which logged the entry of each parent to the nest. est ...199910196057
flexible foraging strategy of cory's shearwater, calonectris diomedea, during the chick-rearing period.procellariiformes are well known for their low rates of food provisioning to their slow-growing chicks. in some species, the patterns of food delivery to chicks have been deduced from changes in their weight, obtained from periodic weighings. however, the behaviour of individual parents cannot be resolved using this method. in this study, we used a periodic weighing protocol with cory's shearwater chicks on selvagem grande island, in the northeast atlantic. in addition, we used an automatic logg ...19989819333
heavy metal concentrations in cory's shearwater, calonectris diomedea, fledglings from the azores, portugal. 19978952934
the homing behaviour of cory's shearwaters (calonectris diomedea) studied by means of a direction recordera direction recorder, which can be carried by a flying bird on its back, has been used for the first time on a wild species. the device can detect and record the direction in which a bird is heading during flight. cory's shearwaters (calonectris diomedea) were moved from their nesting colony to five different sites and fitted with direction recorders, and four homing flight paths were obtained. our data show that the displaced birds were able to assume and maintain a homeward course soon after r ...19959317959
inter- and intraspecific variation of the nucleotide sequence of the cytochrome b gene in cory's (calonectris diomedea), manx shearwater (puffinus puffinus) and the fulmar (fulmarus glacialis).the cytochrome b gene of three european taxa of the family of procellariidae was amplified from total dna and sequenced. the sequence comparison shows that the fulmar (fulmarus glacialis) is significantly distinct from shearwaters, whereas cory's (calonectris diomedea) and manx shearwater (puffinus puffinus) are closely related. although the populations of c. diomedea can be distinguished morphologically, the sequences of cyt b differ only slightly between the atlantic and mediterranean subspeci ...20098363711
breaking the routine: individual cory's shearwaters shift winter destinations between hemispheres and across ocean basins.there is growing evidence that migratory species are particularly vulnerable to rapid environmental changes arising from human activity. species are expected to vary in their capacity to respond to these changes: long-distance migrants and those lacking variability in migratory traits are probably at considerable disadvantage. the few studies that have assessed the degree of plasticity in behaviour of marine animals suggest that fidelity to non-breeding destinations is usually high. in the prese ...201021106591
foraging segregation between two closely related shearwaters breeding in sympatry.trophic segregation has been proposed as a major mechanism explaining the coexistence of closely related animal taxa. however, how such segregation varies throughout the annual cycle is poorly understood. here, we examined the feeding ecology of the two subspecies of cory's shearwater, calonectris diomedea diomedea and calonectris diomedea borealis, breeding in sympatry in a mediterranean colony. to study trophic segregation at different stages, we combined the analysis of isotope values (delta( ...200919364709
features of dna fragments obtained by random amplified polymorphic dna (rapd) assaysrandom amplified polymorphic dna (rapd) fragments were prepared from samples of calonectris diomedea (cory's shearwater, aves) and haemonchus contortus (nematoda) dna by polymerase chain reaction (pcr) using decamers containing two restriction enzyme sites as primers. six of 19 studied rapd fragments probably originated from traces of commensal microorganisms. many rearranged fragments, absent in the original genomic dna, were synthesized and amplified during the processing of all the dna sample ...199910199010
does sexual segregation occur during the nonbreeding period? a comparative analysis in spatial and feeding ecology of three calonectris shearwaters.sexual segregation (ss) is widespread among animal taxa, with males and females segregated in distribution, behavior, or feeding ecology but so far, most studies on birds have focused on the breeding period. outside this period, the relevance of segregation and the potential drivers of its persistence remain elusive, especially in the marine environment, where animals can disperse over vast areas and are not easily observed. we evaluated the degree of ss in spatio-temporal distribution and pheno ...201931624542
spontaneous primary right tibiotarsal osteosarcoma with pulmonary metastasis in a free-ranging cory's shearwater (calonectris diomedea).we report the pathologic features of a primary right tibiotarsal productive osteoblastic osteosarcoma with pulmonary metastasis, a unique finding in a cory's shearwater (calonectris diomedea).202031237823
occurrence of per- and polyfluoroalkyl substances in calonectris shearwaters breeding along the mediterranean and atlantic colonies.the objective of the present study was to assess the presence of 17 per- and polyfluoroalkyl substances (pfas) in blood of two closely related top predators, the scopoli's (calonectris diomedea) and cory's (c. borealis) shearwaters that breed allopatrically in mediterranean and atlantic basins. among pfas, perfluorooctanesulfononic acid (pfos) and long chain perfluorinated carboxylic acids (pfca) were detected in all samples, highlighting somehow the ubiquity of such pollutants. scopoli's shearw ...201829886955
maiden voyage into death: are fisheries affecting seabird juvenile survival during the first days at sea?the study of juvenile migration behaviour of seabird species has been limited so far by the inability to track their movements during long time periods. foraging and flying skills of young individuals are assumed to be inferior to those of adults, making them more vulnerable during long-distance migrations. in addition to natural oceanographic effects and intrinsic conditions, incidental seabird harvest by human fisheries is one of the main causes of worldwide seabird population declines, and it ...201930800365
crossing the pillars of hercules: understanding transoceanic migrations of seabirds throughout their breeding range.variability in long-distance migration strategies is still poorly understood due to the fact that individuals are often tracked from a single colony/population. transoceanic migrations of scopoli's shearwaters (calonectris diomedea) across the strait of gibraltar (sog) have been tracked from several breeding colonies isolatedly, and factors related to the variability in phenological schedules among different populations remain, therefore, not well-understood. using light-level geolocator data, i ...201931031942
interactions between commercial fishing vessels and a pelagic seabird in the southern mediterranean sea.fishing activities can influence foraging behaviour of many seabird species worldwide. seabirds are attracted by fishing vessels which can facilitate access to demersal fish as a novel food resource that otherwise would be unavailable. on the other hand, intense fishing activities cause depletion of fish stocks with a reduction of natural prey available for seabirds. moreover, fisheries discards can have lower nutritional value than natural prey. however, the importance of fisheries discard for ...201830514281
short-term prey field lability constrains individual specialisation in resource selection and foraging site fidelity in a marine predator.spatio-temporally stable prey distributions coupled with individual foraging site fidelity are predicted to favour individual resource specialisation. conversely, predators coping with dynamic prey distributions should diversify their individual diet and/or shift foraging areas to increase net intake. we studied individual specialisation in scopoli's shearwaters (calonectris diomedea) from the highly dynamic western mediterranean, using daily prey distributions together with resource selection, ...201829659122
rafting behaviour of seabirds as a proxy to describe surface ocean currents in the balearic sea.spatio-temporal variability of surface geostrophic mesoscale currents in the balearic sea (western mediterranean) is characterized from satellite altimetry in combination with in-situ velocity measurements collected, among others, by drifting buoys, gliders and high-frequency radar. here, we explore the use of tracking data from living organisms in the balearic sea as an alternative way to acquire in-situ velocity measurements. specifically, we use gps-tracks of resting scopoli's shearwaters cal ...201930635588
differential adult survival at close seabird colonies: the importance of spatial foraging segregation and bycatch risk during the breeding season.marine megafauna, including seabirds, are critically affected by fisheries bycatch. however, bycatch risk may differ on temporal and spatial scales due to the uneven distribution and effort of fleets operating different fishing gear, and to focal species distribution and foraging behavior. scopoli's shearwater calonectris diomedea is a long-lived seabird that experiences high bycatch rates in longline fisheries and strong population-level impacts due to this type of anthropogenic mortality. anal ...201829178374
trace metal blood concentrations in scopoli's shearwaters (calonectris diomedea) during 2007-2014: a systematic analysis of the largest species colony in greece.in this study, the concentrations of cadmium (cd), lead (pb), chromium (cr), copper (cu), cobalt (co), nickel (ni), manganese (mn) and zinc (zn) were investigated in the blood of scopoli's shearwaters (calonectris diomedea). blood samples (n=238) were collected from both juvenile and adult individuals during seven breeding seasons between 2007 and 2014, excluding 2013. sampling was performed in the pristine environment of the strofades island complex, greece, where the largest colony of scopoli' ...201931319255
a long-term retrospective study on rehabilitation of seabirds in gran canaria island, spain (2003-2013).the aims of this study were to analyze the causes of morbidity and mortality in a large population of seabirds admitted to the tafira wildlife rehabilitation center (twrc) in gran canaria island, spain, from 2003 to 2013, and to analyze the outcomes of the rehabilitation process.201728475653
varying demographic impacts of different fisheries on three mediterranean seabird species.fisheries have an enormous economic importance, but reconciling their socio-economic features with the conservation and sustainability of marine ecosystems presents major challenges. bycatch mortality from fisheries is clearly among the most serious global threats for marine ecosystems, affecting a wide range of top predators. recent estimates report ca. 200,000 seabirds killed annually by bycatch in european waters. however, there is an urgent need to rigorously estimate actual mortality rates ...201728231421
patterns of mercury exposure and relationships with isotopes and markers of oxidative status in chicks of a mediterranean seabird.the mediterranean basin is a hotspot of mercury (hg) contamination owing to intense anthropogenic emissions, volcanic activity and oligotrophic conditions. little work has been done to assess the sources of hg exposure for seabirds and, particularly, the physiological consequences of hg bioaccumulation. in this study, we (i) describe the individual and temporal variation in blood concentration of total hg (thg) over three breeding seasons, (ii) identify the factors that affect the thg exposure a ...202032041034
tracking through life stages: adult, immature and juvenile autumn migration in a long-lived seabird.seasonal long-distance migration is likely to be experienced in a contrasted manner by juvenile, immature and adult birds, leading to variations in migratory routes, timing and behaviour. we provide the first analysis of late summer movements and autumn migration in these three life stages, which were tracked concurrently using satellite tags, geolocators or gps recorders in a long-ranging migratory seabird, the scopoli's shearwater (formerly named cory's shearwater, calonectrisdiomedea) breedin ...201323977344
anosmia impairs homing orientation but not foraging behaviour in free-ranging shearwaters.shearwaters deprived of their olfactory sense before being displaced to distant sites have impaired homing ability but it is unknown what the role of olfaction is when birds navigate freely without their sense of smell. furthermore, treatments used to induce anosmia and to disrupt magneto-reception in displacement experiments might influence non-specific factors not directly related to navigation and, as a consequence, the results of displacement experiments can have multiple interpretations. to ...201728851985
individual variation of persistent organic pollutants in relation to stable isotope ratios, sex, reproductive phase and oxidative status in scopoli's shearwaters (calonectris diomedea) from the southern mediterranean.little is known about the accumulation of persistent organic pollutants (pops) and its consequences for seabirds in the mediterranean basin. we characterised the plasma contaminant profile (polychlorinated biphenyls σpcbs; organochlorine pesticides σocps; polybrominated diphenyl ethers σpbdes) of a population of the seabird scopoli's shearwater (calonectris diomedea) that breeds in the southern mediterranean (linosa island) and investigated (i) whether sex, stable isotope ratios (related to diet ...201728441596
absence of haemosporidian parasite infections in the long-lived cory's shearwater: evidence from molecular analyses and review of the literature.the apparent scarcity or absence of blood parasites in some avian groups, such as seabirds, has been related to intrinsic and extrinsic factors including host immunological capacity, host-parasite assemblage, and ecological parameters, but also to reduced sensitivity of some methods to detect low parasite prevalence/intensities of infection. here, we examined the haemosporidian parasite prevalence in a breeding population of cory's shearwater calonectris diomedea borealis, a long-distance migran ...201829124410
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