| the ultrastructure of the capsule surrounding pomphorhynchus laevis (acanthocephala) in its intermediate host echinogammarus stammeri (amphipoda). | the capsule or the membranous layer surrounding larvae of pomphorhynchus laevis müller, 1776 in its intermediate host, echinogammarus stammeri s. karaman, 1931, was studied by electron microscopy. some observations were also made with a light microscope. capsule components mainly show a tubular profile; capsule thickness can reach up to 8 microns. in some instances, within the hemocoel of e. stammeri, the parasite was encapsulated by amphipod hemocytes. | 1992 | 1339979 |
| occurrence of pomphorhynchus laevis müller 1776 (acanthocephala) in silurus glanis (l.) from the river po. | the sheatfish, silurus glanis (l.), from the terminal part of river po was examined for the presence of helminth parasites. of 182 s. glanis specimens, 95 (52.2%) were infected with the acanthocephalan pomphorhynchus laevis. mid-gut followed by fore-gut appeared to be the most infected portions of host alimentary canal. in 45 sheatfish of total length < or = 40 cm, specimens of p. laevis were found encapsulated in mesenteric and peritoneal tissues. a comparison between light and electron microsc ... | 1992 | 1339980 |
| comparative investigations of the morphology and chemical composition of the eggshells of acanthocephala. ii. palaeacanthocephala. | eggshells of the palaeacanthocephalans acanthocephalus anguillae, pomphorhynchus laevis and polymorphus minutus were investigated for their fine structure as well as their chemical composition. the acanthor larvae are surrounded by four eggshells (e1-e4) separated by interstices (g1-g4). immature eggs do not exhibit the complete set of eggshells. the chemical composition of the outermost, thin eggshell (e1) remains unknown. e2 is supplied by outer filaments of different strength; it contains ker ... | 1992 | 1379711 |
| cystathionine beta-synthase and gamma-cystathionase in helminths. | the activities of gamma-cystathionase and cystathionine beta-synthase were investigated in a range of gastrointestinal, free-living and entomophagous nematodes. although nematode gamma-cystathionase used the same range of substrates as the mammalian hepatic enzyme, its activity was extremely low and there were significant interspecies variations with respect to the relative order of active substrates. like the mammalian liver enzyme, nematode cystathionine beta-synthase showed activity in the di ... | 1991 | 1805216 |
| site availability and density-dependent constraints on the acanthocephalan pomphorhynchus laevis in rainbow trout, oncorhynchus mykiss (walbaum). | threshold density levels were investigated experimentally in rainbow trout, oncorhynchus mykiss, for the acanthocephalan pomphorhynchus laevis. fifty small fish 120-150 mm long were infected with 50 cystacanths each every 4 weeks for 16 weeks, and samples of up to 10 fish examined at 1, 5, 9, 13 and 17 weeks after the original infection. the mean intestinal length was found to have increased significantly over this period, from a mean of 125 to 173 mm and the mean number of parasites recovered i ... | 1991 | 1866187 |
| interactions between the acanthocephalans pomphorhynchus laevis and acanthocephalus anguillae in rainbow trout: testing an exclusion hypothesis. | rainbow trout were infected simultaneously with cystacanths of the two acanthocephalan species pomphorhynchus laevis and acanthocephalus anguillae in the laboratory. infections consisted of varying proportions of the two species (from 0 to 100%) at low (20 cystacanths) and high (60 cystacanths) levels. fish were sacrificed at 7, 56 and 112 days post-infection (p.i.) and the parasites recovered. at low-level infections there was a high degree of overlap in the range of intestine occupied by the t ... | 1990 | 2362768 |
| the immune response of a cyprinid fish to infections of the acanthocephalan pomphorhynchus laevis. | | 1972 | 4196350 |
| the effects of temperature and other factors upon the establishment and survival of pomphorhynchus laevis (acanthocephala) in goldfish, carassius auratus. | | 1972 | 4680538 |
| the importance of parasite mortality in regulating the population size of the acanthocephalan pomphorhynchus laevis in goldfish. | | 1974 | 4815475 |
| the fine structure of the acanthor shell of pomphorhynchus laevis (acanthocephala). | | 1972 | 5018475 |
| preliminary observations on the ultrastructure of the body wall of pomphorhynchus laevis (acanthocephala). | | 1966 | 5336137 |
| cadmium concentrations in two adult acanthocephalans, pomphorhynchus laevis and acanthocephalus lucii, as compared with their fish hosts and cadmium and lead levels in larvae of a. lucii as compared with their crustacean host. | adults of pomphorhynchus laevis and acanthocephalus lucii were analyzed for cadmium by atomic absorption spectrometry. their cadmium concentrations were compared with those found in different tissues (muscle, liver, and intestine) of their final hosts the chub and perch. additionally, the cadmium and lead concentrations in larvae of a. lucii and their intermediate host asellus aquaticus were determined. regarding the adult acanthocephalans, the parasites showed several times more cadmium than di ... | 1995 | 7567908 |
| cyathocephalus truncatus (cestoda: spathebothridea) in its intermediate host echinogammarus stammeri (amphipoda) from the river brenta, northern italy. | a study was carried out on the occurrence of the tapeworm cyathocephalus truncatus (pallas, 1781) (cestoda: spathebothridea) in its intermediate host, the amphipod echinogammarus stammeri, in the river brenta. a total of 18,860 e. stammeri was examined from july 1990 to june 1994; only 25 of them (prevalence 0.13%) were infected with tapeworm larvae (intensity of infection 1 larva/host). co-occurrence of c. truncatus larvae with the larva of the acanthocephalan pomphorhynchus laevis (müller, 177 ... | 1995 | 8532369 |
| populations of acanthocephalus anguillaepomphorhynchus laevis in rivers with different pollution levels | the distribution of two acanthocephalan species (pomphorhynchus laevisacanthocephalus anguillae) in the chub (leuciscus cephalus) was studied in four river reaches characterized by different levels of pollution: the river ticino near abbiategrasso (unpolluted), the naviglio grande canal, in milano (slightly polluted), the river lambro near merone village (polluted) and the river lambro near monza (severely polluted).pomphorhynchus laevis was restricted to the unpolluted and the slightly polluted ... | 1998 | 9858630 |
| pomphorhynchus laevis: the intestinal acanthocephalan as a lead sink for its fish host, chub (leuciscus cephalus). | aqueous lead exposure of chub (leuciscus cephalus) experimentally infected with the parasite pomphorhynchus laevis resulted in a rapid accumulation of this metal in the intestinal acanthocephalans, reaching concentrations which were significantly greater than in the host muscle, liver, and intestine and approximately 1000 times higher than the exposure con centration. parasitized chub accumulated significantly less lead in their intestinal wall than their uninfected conspecifics (mann-whitney u ... | 1999 | 10502468 |
| parasite-altered behavior in a crustacean intermediate host: field and laboratory studies. | the effects of the acanthocephalan parasite pomphorhynchus laevis on the behavior of its crustacean intermediate host, the amphipod echinogammarus stammeri, were studied. a drift study revealed that infected amphipods were disproportionately represented in drift samples taken throughout a 24-hr period; infection with more than 1 parasite enhanced this effect. infection also interacted with the daily timing of drift, with parasitized amphipods beginning to drift earlier in the evening. two distin ... | 1998 | 9920297 |
| heavy metal concentrations in adult acanthocephalans and cestodes compared to their fish hosts and to established free-living bioindicators. | intestinal helminths of fish caught from freshwater and brackish water biotopes throughout europe were analysed by electrothermal atomic absorption spectrometry for their heavy metal (pb and cd) levels. the metal concentrations of the parasites were compared to those of different organs (muscle, liver, intestine) of the fish hosts and to those detected in the whole bodies of the respective intermediate hosts. the three acanthocephalan species analysed contained very high amounts of pb and cd. th ... | 1997 | 9802069 |
| biodiversity of parasites in freshwater environment in relation to pollution. | during 1994, 129 specimens of chub (leuciscus cephalus l.) from two localities, polluted--bolelouc, 80th river kilometer, near the city of olomouc, and unpolluted--brodské, 225th river kilometer, near the lanzhot on the morava river, were examined for metazoan parasites. altogether 38 metazoan parasite species including helminths, leeches and glochidia belonging to 14 genera were found, 34 in the case of unpolluted locality (brodské) and 28 in the polluted one (bolelouc). in both localities, 24 ... | 1997 | 9802067 |
| uptake of lead by pomphorhynchus laevis cystacanths in gammarus pulex and immature worms in chub (leuciscus cephalus). | the uptake of lead by cystacanths of the acanthocephalan pomphorhynchus laevis in naturally infected amphipods, gammarus pulex, and by immature parasites in experimentally infected fish, leuciscus cephalus, was examined following 3-week experimental exposures (0.01 and 0.1 mg l(-1) pb2+). both g. pulex and the cystacanths of p. laevis accumulated lead but concentrations in the parasites were lower than in the host tissues at the low lead dose and significantly lower at the high dose. p. laevis f ... | 1998 | 9694375 |
| the cement apparatus of larval and adult pomphorhynchus laevis (acanthocephala: palaeacanthocephala). | light and electron microscopy were used to study the ultrastructure of the cement apparatus, namely cement glands and cement ducts of mature specimens of the acanthocephalan parasite pomphorhynchus laevis müller, 1776, recovered from the digestive tracts of fish leuciscus cephalus risso, 1826. in addition, the cement glands of immature p. laevis found within the body cavity of the fish alburnus alburnus alborella de filippi, 1844 were examined. in a mature male of p. laevis the 6 cement glands a ... | 1998 | 9614327 |
| associations and interactions among intestinal helminths of the brown trout, salmo trutta, in northern italy. | species co-occurrences and interspecific associations between intensity of infection were studied in helminth communities of three populations of brown trout, salmo trutta, from northern italy. of the eight helminth species, only four were common enough to be included in the analyses: pomphorhynchus laevis, acanthocephalus anguillae, echinorhynchus truttae and cyathocephalus truncatus. the observed frequencies of co-occurrences of the different species, based on presence/absence data, did not di ... | 2001 | 11818049 |
| colonization and establishment of pomphorhynchus laevis (acanthocephala) in an isolated english river. | the successful colonization, establishment and spread of pomphorhynchus laevis in a small, isolated, devon river 128 km from the parasite's nearest focus in dorset was followed over 11 years from 1985. the parasite was first detected in anguilla anguilla and platichthys flesus in 1988: by 1995 it had attained prevalence levels of 22.6% in a. anguilla and 43.6% in p. flesus and also occurred in 100% salmo trutta, 50% cottus gobio and noemacheilus barbatulus. as judged by prevalence, abundance, pr ... | 1996 | 8991914 |
| metazoan parasite community structure in brown trout from two lakes in western ireland. | a total of 549 brown trout were caught from two lakes, lough feeagh and bunaveela lake, in the burrishoole system, co. mayo, ireland. seven species of metazoan parasite were detected but only four species occurred in > or = 10% of the sample. the parasite community of the trout was dominated by a single species, pomphorhynchus laevis, with a prevalence if 58%. only one allogenic helminth species was recorded from the trout, diphyllobothrium ditremum, with the community mainly comprising autogeni ... | 1995 | 8522767 |
| population biology of pomphorhynchus laevis in brown trout from two lakes in the west of ireland. | since ireland is the only country in which pomphorhynchus laevis (acanthocephala) uses brown trout (salmo trutta) as its preferred definitive host, the population biology of the parasite in this host was investigated thus enabling a comparison to be made with data collected on p. laevis from other hosts, particularly the cyprinids, chub and barbel. over a period of 12 months, 549 brown trout were caught from two lakes, lough feeagh and bunaveela lake, in the burrishoole river system, co. mayo, i ... | 1995 | 8522766 |
| proteolytic enzymes of pomphorhynchus laevis and in three other acanthocephalan species. | cystacanths and adults of the acanthocephalan pomphorhynchus laevis were found to release proteolytic enzymes during in vitro culture. culture media in which cystacanths had been kept contained a trypsinlike collagenolytic proteinase exhibiting a molecular mass of 29 kda on gelatin substrate gel electrophoresis and a ph optimum at ph 9.0. samples of adults possessed a trypsinlike collagenolytic proteinase with a molecular mass of 26 kda and showed a ph optimum at 9.0. leucine aminopeptidase acti ... | 1994 | 8308657 |
| lead accumulation in pomphorhynchus laevis and its host. | adults of pomphorhynchus laevis were collected from the intestines of 10 chubs (leuciscus cephalus) from the river ruhr near bochum, germany. the acanthocephalans and various tissues of the fish (muscle, liver, and intestine) were analyzed for lead with electrothermal atomic absorption spectrometry. the mean lead level in the parasite was 54 micrograms/g wet weight, which was 284 times more than in the host intestine, 771 times more than in host liver, and 2,700 times more than in host muscle. t ... | 1994 | 8195935 |
| leucine aminopeptidase activity in adults of pomphorhynchus laevis (acanthocephala): a histochemical study. | in frozen sections of the acanthocephalan pomphorhynchus laevis, which is a frequent intestinal parasite of cyprinid and salmonid fishes, leucine aminopeptidase (apase) was localized histochemically in outer parts of the presomal bulbus as well as in all layers and most nuclei of the metasomal body wall. enzyme activity visualized at ph 6.5 using l-leucyl-4-methoxy-2-naphtylamide as the substrate was also associated with ovarian balls, immature larvae, and the testes. the results are discussed w ... | 1994 | 7809000 |
| lipids of fish parasites and their hosts: fatty acid fingerprints of four species of acanthocephalans and of their hosts' intestinal tissues. | the fatty acid fingerprints of total lipid extracts from the four fish parasites acanthocephalus lucii, neoechinorhynchus rutili, paratenuisentis ambiguus, and pomphorhynchus laevis were investigated by capillary gas-liquid chromatography (glc). the fatty acid patterns of the parasites were compared with those of their respective host tissue, viz., intestinal tract tissue of infected perch, brown trout, eel, and chub. the highly complex gas chromatograms revealed significant differences not only ... | 1995 | 7567912 |
| influence of enteric helminths on the distribution of intestinal endocrine cells belonging to the diffuse endocrine system in brown trout, salmo trutta l. | the presence of intestinal helminths in the alimentary canal of brown trout, salmo trutta l., can alter the number of cells that synthesize modulatory peptides. a total of 167 brown trout were collected from tributaries of the river brenta (northern italy), of which 119 (71.3%) specimens were infected with enteric helminths, 28 with the acanthocephalan pomphorhynchus laevis müller, 1776 with intensity of infection ranging from 1 to 162 (18.57 +/- 30.79) worms per host and 67 fish with the cestod ... | 2003 | 12962225 |
| [remarks on pomphorhynchus laevis (zoega, muller 1776) as a parasite in pleuronectes flesus and pleuronectes platessa]. | | 1957 | 13457088 |
| [helminths in trout (fam. salmonidae) in freshwater reservoirs]. | a survey is made of the helminths parasitizing in representatives of family salmonidae caught mainly in the free fresh-water basins in the country. more detailed information and study concerned the american and the balkan trout--salmo irideus gairdneri and salmo trutta m. fario respectively--because of their higher economic importance. in the course of the study some corrections were made of the names of some of the species in the light of the new data obtained concerning all helminths alreay me ... | 1982 | 7179733 |
| the effect of the acanthocephalan pomphorhynchus laevis upon the respiration of its intermediate host, gammarus pulex. | | 1974 | 4826717 |
| pathological changes induced by pomphorhynchus laevis muller (acanthocephala) in the gut of rainbow trout, salmo gairdneri richardson. | the consequences of infection of rainbow trout, salmo gairdneri richardson, by an acanthocephalan, pomphorhynchus laevis muller, have been studied using light and electron microscopy. the mucosal epithelium, of the gut adjacent to the metasoma of the worm suffered compression and abrasion. the praesoma of p. laevis penetrated the mucosal epithelium, lamina propria, stratum compactum, stratum granulosum, muscularis and serosa of the gut wall, and was invested by a fibrous capsule of inflammation ... | 1986 | 3962428 |
| potential interactions between acanthocephalus anguillae and pomphorhynchus laevis in their natural hosts chub, leuciscus cephalus and the european eel, anguilla anguilla. | chub and eels were experimentally infected via intermediate hosts harbouring cystacanths, with pomphorhynchus laevis alone, or acanthocephalus anguillae alone, or simultaneously with mixtures of both species in varying proportions, and sampled at 7, 56 or 112 days post-infection. examination of chub revealed that both species showed low establishment and growth rates, differing markedly from british field data, where chub is apparently one of the most important hosts, and preventing further mean ... | 1991 | 1852495 |
| histopathology in leuciscus cephalus (pisces: cyprinidae) resulting from infection with pomphorhynchus laevis (acanthocephala). | the histopathology present in leuciscus cephalus risso 1826 from the river po, naturally infected with the acanthocephalan pomphorhynchus laevis müller 1776, was studied and described. the parasite was only found within the host's digestive tract, and a density of 10 p. laevis per square centimeter was common. on histological examination it was noticed that both male and female parasites penetrated deeply through all the layers of the host digestive tract by means of their slender neck, bulb and ... | 1991 | 1844504 |
| the sites occupied by the acanthocephalan pomphorhynchus laevis in the alimentary canal of fish. | the distribution of the acanthocephalan pomphorhynchus laevis along the alimentary tract of several species of freshwaster fish was studied in both natural and experimental infections. the parasite exhibits a clear preference for a particular region of the alimentary canal, which differs from host species to host species, but it is capable of surviving in all regions of the intestine. in some species, but not in all, its growth rate may be reduced in regions outside of the preferred site. the pa ... | 1976 | 1264491 |
| costs of intraspecific and interspecific host sharing in acanthocephalan cystacanths. | larval helminths often share individual intermediate hosts with other larval worms of the same or different species. in the case of immature acanthocephalans capable of altering the phenotype of their intermediate hosts, the benefits or costs of host sharing can be evaluated in terms of increased or decreased probability of transmission to a suitable definitive host. competitive interactions among the immature stages of acanthocephalans within the intermediate host could create additional costs ... | 2001 | 11315182 |
| the effect of the acanthocephalan parasite pomphorhynchus laevis on the lipid and glycogen content of its intermediate host gammarus pulex. | besides conspicuous changes in behaviour, manipulative parasites may also induce subtle physiological effects in the host that may also be favourable to the parasite. in particular, parasites may be able to influence the re-allocation of resources in their own favour. we studied the association between the presence of the acanthocephalan parasite, pomphorhynchus laevis, and inter-individual variation in the lipid and glycogen content of its crustacean host, gammarus pulex (amphipoda). infected g ... | 2001 | 11306112 |
| species associations among larval helminths in an amphipod intermediate host. | larval helminths that share the same intermediate host may or may not also share the same definitive hosts. if one or more of these helminth species can manipulate the phenotype of the intermediate host, there can be great advantages or severe costs for other helminths resulting from co-occurring with a manipulator, depending on whether they have the same definitive host or not. among 2372 specimens of the amphipod echinogammarus stammeri collected from the river brenta, northern italy, there wa ... | 2000 | 11027778 |
| evidence for the hypothesis of strain formation in pomphorhynchus laevis (acanthocephala): an investigation using mitochondrial dna sequences. | a hypothesis has been erected stating that in the british isles the acanthocephalan, pomphorhynchus laevis can be separated into 3 strains, an english, irish and marine strain. ecological and morphological evidence exists in support of this hypothesis. an investigation at the molecular level was conducted in order to test the validity of the existing evidence. a mitochondrial gene, subunit i of cytochrome c oxidase was partially sequenced from 3 irish populations of p. laevis, 1 scottish populat ... | 2004 | 15471009 |
| conflict between co-occurring manipulative parasites? an experimental study of the joint influence of two acanthocephalan parasites on the behaviour of gammarus pulex. | when two parasite species are manipulators and have different definitive hosts, there is a potential for conflict between them. selection may then exist for either avoiding hosts infected with conflicting parasites, or for hijacking, i.e. competitive processes to gain control of the intermediate host. the evidence for both phenomena depends largely on the study of the relative competitive abilities of parasites within their common intermediate host. we studied the effects of simultaneous infecti ... | 2000 | 10874725 |
| the origin and function of cement gland secretion in pomphorhynchus laevis (acanthocephala). | cement gland protein in male and inseminated female individuals of an acanthocephalan parasite of fish, pomphorhynchus laevis (müller, 1776), was localized by immunohistochemistry using an antibody specific for cement protein. male p. laevis possess 3 pairs of round to oval cement glands ranging from 0.5 to 0.9 mm in length and from 0.3 to 0.7 mm in width. each gland has an outer portion containing nuclear fragments and other cellular organelles surrounding a space for storage of gland products. ... | 1999 | 10633927 |
| the parasite community infecting flounders, platichthys flesus, in the tidal thames. | the composition of the parasite fauna of the flounder, platichthys flesus, retrieved from two locations in the tidal thames is described in detail for the first time. the combined parasite species list of the flounders from lots road in the upper tideway and west thurrock in the middle tideway consisted of one protozoan (glugea stephani), one monogenean (gyrodactylus sp.), four larval digeneans (cryptocotyle concava, timoniella imbutiforme, t. praeterita, and labratrema minimus), five adult dige ... | 1999 | 10526412 |
| richness and diversity of parasite communities in european eels anguilla anguilla of the river rhine, germany, with special reference to helminth parasites. | a total of 121 european eels (anguilla anguilla) from 2 sampling sites on the river rhine were investigated in respect of their parasite communities. special attention was given to the swim bladders, intestines, gills and fins of the fish. twelve different parasite species were found to live in and on the eels. data from each sampling site were kept separate. parasites found in descending order of prevalence were: anguillicola crassus, trypanosoma granulosum, myxobolus sp., paratenuisentis ambig ... | 1999 | 10503258 |
| comparison between lead accumulation of pomphorhynchus laevis (palaeacanthocephala) in the intestine of chub (leuciscus cephalus) and in the body cavity of goldfish (carassius auratus auratus). | this experimental study assessed the role of the microhabitat in the uptake of metals by adult acanthocephalans. we examined the accumulation of lead by adult pomphorhynchus laevis in the intestine of chub (leuciscus cephalus) and compared it with that in goldfish, carassius auratus auratus, in which the parasites penetrate the intestinal wall and enter the body cavity. chub and goldfish experimentally infected with adult pomphorhynchus laevis were exposed to 0.01 mg l(-1) pb(2+) over 3 weeks. l ... | 2001 | 11336747 |
| differential influence of pomphorhynchus laevis (acanthocephala) on the behaviour of native and invader gammarid species. | although various species of acanthocephalan parasites can increase the vulnerability of their amphipod intermediate hosts to predation, particularly by altering their photophobic behaviour, their influence on the structure of amphipod communities and the success of invader species has so far received little attention. we compared the prevalence and behavioural influence of a fish acanthocephalan parasite, pomphorhynchus laevis, in two species of amphipods, gammarus pulex and gammarus roeseli in ... | 2000 | 11428335 |
| a comparison of freshwater and marine/estuarine strains of pomphorhynchus laevis occurring sympatrically in flounder, platichthys flesus, in the tidal thames. | collections of flounder, platichthys flesus, at two sites on the tidal river thames in 1994 and 1995 have, for the first time, revealed the sympatric occurrence of the freshwater and marine/estuarine strains of the acanthocephalan parasite pomphorhynchus laevis. this natural co-occurrence of the strains has been employed to compare infection levels and a range of parasite attributes of the two strains under conditions of sympatry. at both lots road (chelsea) and tilbury the marine/estuarine stra ... | 2001 | 11551313 |
| patterns of intermediate host use and levels of association between two conflicting manipulative parasites. | for many parasites with complex life cycles, manipulation of intermediate host phenotypes is often regarded as an adaptation to increase the probability of successful transmission. this phenomenon creates opportunities for either synergistic or conflicting interests between different parasite species sharing the same intermediate host. when more than one manipulative parasite infect the same intermediate host, but differ in their definitive host, selection should favour the establishment of a ne ... | 2002 | 11796118 |
| helminth communities of european eels anguilla anguilla (linnaeus, 1758) from the vistula lagoon and puck bay, poland. | within 2001-2002 a total of 621 eel anguilla anguilla (l., 1758) (488 from the vistula lagoon and 133 from the puck bay) were examined. fifteen parasite taxa were recovered: pseudodactylogyrus anguillae (yin et sproston, 1948), brachyphallus crenatus (rudolphi, 1802), deropristis inflata (molin, 1859), diplostomum spp., bothriocephalus claviceps (goeze, 1782), proteocephalus macrocephalus (creplin, 1825), anguillicola crassus (kuwahara, niimi et itagaki, 1974), camallanus lacustris (zoega, 1776) ... | 2005 | 16838624 |
| [helminths fauna of fishes in the mała panew river drainage basin]. | a parasitological investigation was made at 420 fishes from 10 species: perca fluviatilis l., gymnocephalus cernuus (l.), gobio gobio (l.), tinca tinca (l.), leuciscus idus (l), noemacheilus barbatulus (l.), lota lota (l.), leucaspisus delineatus (heckell 843), blicca biorkna (l.) and rhodeus sericeus amarus (bloch 1782). the fishes were caught over one year period (1995-1996) in the mała panew river drainage basin (south poland). in examined fishes the following parasite species were found: dip ... | 2000 | 16886354 |
| comparison of the macroparasite communities of wild and stocked brown trout (salmo trutta l.) in the west of ireland. | the aim of the present study was to compare the helminth infra and component communities of wild and stocked brown trout in lough feeagh, in the west of ireland, and also to examine the establishment and development of helminth communities in stocked brown trout. fish were sampled in may, august and november 1997 and 1998 and an additional sample of wild brown trout was examined in april 1997. in total 217 wild trout and 122 stocked trout were examined. the acanthocephalans acanthocephalus clavu ... | 2002 | 12003067 |
| parasitic infection and developmental stability: fluctuating asymmetry in gammarus pulex infected with two acanthocephalan species. | several studies have reported a negative association between developmental stability and parasitic infection. however, the host-parasite associations examined so far consist only of a limited number of parasite taxa, and developmental stability was appraised on definitive hosts. the present study examines the association between infection by 2 acanthocephalan parasites. pomphorhynchus laevis and polymorphus minutus, and the developmental stability of their common intermediate host gammarus pulex ... | 2002 | 12053979 |
| effects of two acanthocephalan parasites on the fecundity and pairing status of female gammarus pulex (crustacea: amphipoda). | acanthocephalan parasites are known to alter the reproductive biology and physiology of their hosts in various ways. in this study we investigated the influence of two acanthocephalan parasites, pomphorhynchus laevis and polymorphus minutus, on the fecundity and pairing success of female gammarus pulex. the results show that p. laevis and p. minutus affect female intermediate host reproduction in different ways. females infected with p. minutus were totally castrated, whereas those infected with ... | 2002 | 12095239 |
| infection with an acanthocephalan manipulates an amphipod's reaction to a fish predator's odours. | many parasites with complex life cycles increase the chances of reaching a final host by adapting strategies to manipulate their intermediate host's appearance, condition or behaviour. the acanthocephalan parasite pomphorhynchus laevis uses freshwater amphipods as intermediate hosts before reaching sexual maturity in predatory fish. we performed a series of choice experiments with infected and uninfected gammarus pulex in order to distinguish between the effects of visual and olfactory predator ... | 2007 | 17049528 |
| effect of pomphorhynchus laevis (acanthocephala) on putative neuromodulators in the intestine of naturally infected salmo trutta. | immunohistochemical and pathological studies were carried out on the digestive tract of parasitized and uninfected specimens of salmo trutta (l.). a total of 124 brown trout were collected on several occasions from 3 tributaries of the brenta river, northern italy. twenty-eight individuals of s. trutta (22.6%) were parasitized with pomphorhynchus laevis (miller, 1776). the occurrence of p. laevis in the trout gut significantly increased the number of endocrine cells immunoreactive to calcitonin ... | 2002 | 12240968 |
| is the host or the parasite the most locally adapted in an amphipod-acanthocephalan relationship? a case study in a biological invasion context. | manipulative endoparasites with complex life cycles can alter their intermediate host immunity and behaviour in ways that increase survival probability within the host body cavity and enhance successful transmission to the definitive host. these parasitic manipulations are variable among and within parasite species and may result from co-evolutionary processes, in which the parasite is constrained for adaptation to the local intermediate host. hence, arrival of a new host species in a local host ... | 2007 | 17266962 |
| differential influence of pomphorhynchus laevis (acanthocephala) on brain serotonergic activity in two congeneric host species. | the physiological mechanisms by which parasites with complex life cycles manipulate the behaviour of their intermediate hosts are still poorly understood. in burgundy, eastern france, the acanthocephalan parasite pomphorhynchus laevis inverses reaction to light in its amphipod host gammarus pulex, but not in gammarus roeseli, a recent invasive species. here, we show that this difference in manipulation actually reflects a difference in the ability of the parasite to alter brain serotonergic (5-h ... | 2007 | 17443968 |
| pomphorhynchus laevis (palaeacanthocephala) in the intestine of chub (leuciscus cephalus) as an indicator of metal pollution. | chub experimentally infected with the acanthocephalan parasite pomphorhynchus laevis were exposed to 0.01 mg l(-1) pb(2+) over 5 weeks. lead was rapidly accumulated in the intestinal worms reaching a steady-state concentration after 4 weeks. this concentration was significantly greater than in the host muscle, liver and intestine and more than 9,000 times higher than the exposure concentration. lead accumulation in p. laevis increased at a higher exposure concentration but was not correlated wit ... | 2003 | 12547347 |
| field evidence of host size-dependent parasitism in two manipulative parasites. | the distribution of parasites within host natural populations has often been found to be host age-dependent. host mortality induced by parasites is the commonest hypothesis proposed for explaining this pattern. despite its potential importance in ecology, the parasitism intensity in relation with the host age has rarely been studied in the field. the 2 manipulative acanthocephalans, polymorphus minutus and pomphorhynchus laevis, use the amphipod gammarus pulex as an intermediate host, and their ... | 2007 | 17918352 |
| modification of hosts' behavior by a parasite: field evidence for adaptive manipulation. | parasites relying on trophic transmission to complete their life cycles often induce modifications of their host's behavior in ways that may increase their susceptibility to predation by final hosts. these modifications have often been interpreted as parasite adaptations, but very few studies have demonstrated that host manipulation has fitness benefits for the parasite. the aim of the present study was to address the adaptive significance of parasite manipulation by coupling observations of beh ... | 2007 | 18051653 |
| a predator's dilemma: prey choice and parasite susceptibility in three-spined sticklebacks. | the acanthocephalan parasite pomphorhynchus laevis is transmitted by a suitable intermediate host such as the amphipod gammarus pulex to its definitive fish host. parasite-induced alterations in both appearance and behaviour concur to render infected gammarids more vulnerable to predation, thus promoting parasite transmission. experimental infection of laboratory bred full- and half-sib groups of three-spined sticklebacks (gasterosteus aculeatus) provided evidence that the parasite imposes a sur ... | 2003 | 12741513 |
| infection with acanthocephalans increases the vulnerability of gammarus pulex (crustacea, amphipoda) to non-host invertebrate predators. | phenotypic alterations induced by parasites in their intermediate hosts often result in enhanced trophic transmission to appropriate final hosts. however, such alterations may also increase the vulnerability of intermediate hosts to predation by non-host species. we studied the influence of both infection with 3 different acanthocephalan parasites (pomphorhynchus laevis, p. tereticollis, and polymorphus minutus) and the availability of refuges on the susceptibility of the amphipod gammarus pulex ... | 2008 | 18371238 |
| crustacean-acanthocephalan interaction and host cell-mediated immunity: parasite encapsulation and melanization. | host-parasite interactions of pomphorhynchus laevis (müller, 1776) in naturally infected amphipod, echinogammarus stammeri (karaman), from the brenta river (northern italy) are described. a fully developed acanthocephalan larva occupies a large portion of an amphipod's haemocoelic space; thus, the parasite frequently induces displacement of host digestive tract and other internal organs. however, no apparent damage to the host's internal structures was observed. within the haemocoel of e. stamme ... | 2008 | 18578167 |
| immune depression induced by acanthocephalan parasites in their intermediate crustacean host: consequences for the risk of super-infection and links with host behavioural manipulation. | parasite survival in hosts mainly depends on the capacity to circumvent the host immune response. acanthocephalan infections in gammarids are linked with decreased activity of the prophenoloxidase (propo) system, suggesting an active immunosuppression process. nevertheless, experimental evidence for this hypothesis is lacking: whether these parasites affect several immune pathways is unknown and the consequences of such immune change have not been investigated. in particular, the consequences fo ... | 2009 | 18708062 |
| effects of conspecifics and heterospecifics on individual worm mass in four helminth species parasitic in fish. | intraspecific and interspecific effects on the growth and body size of helminths are rarely studied in natural situations, yet knowing what determines helminth sizes and thus fecundity is crucial to our understanding of helminth ecology and epidemiology. the determinants of average individual worm mass were investigated in four common species of helminths parasitic in trout, salmo trutta. in the acanthocephalan echinorhynchus truttae, there was a negative relationship between the intensity of in ... | 2003 | 12756550 |
| est based phylogenomics of syndermata questions monophyly of eurotatoria. | the metazoan taxon syndermata comprising rotifera (in the classical sense of monogononta+bdelloidea+seisonidea) and acanthocephala has raised several hypotheses connected to the phylogeny of these animal groups and the included subtaxa. while the monophyletic origin of syndermata and acanthocephala is well established based on morphological and molecular data, the phylogenetic position of syndermata within spiralia, the monophyletic origin of monogononta, bdelloidea, and seisonidea and the acant ... | 2008 | 19113997 |
| the endohelminth fauna of barbel ( barbus barbus) correlates with water quality of the danube river in bulgaria. | summary: infection of barbel with 10 species of metazoan parasites including 3 trematodes, 3 acanthocephalans and 4 nematodes was observed in fish collected from 3 localities in the bulgarian part of the river danube between summer 2004 and summer 2007. the composition as well as the diversity characteristics of the parasite communities were analysed seasonally and showed a clear correlation with the composition of the invertebrate fauna and water quality. the most prevalent species was the acan ... | 2009 | 19250599 |
| the life cycle and seasonal changes in the occurrence of pomphorhynchus laevis (palaeacanthocephala, pomphorhynchidae) in a small isolated lake. | in a small isolated lake in slovakia, the fish acanthocephalan pomphorhynchus laevis using gammarus balcanicus and the minnow phoxinus phoxinus, respectively, as its intermediate and final hosts, represented a dominant helminth species. its prevalence and intensity of infection in fish showed no significant variation during a year fluctuating above the mean values of 89% and 6.6 worms per fish. the mean prevalence of p. laevis larvae in gammarus was 41.4% with a maximum in the late summer and au ... | 2003 | 14535165 |
| activity levels and predator detection by amphipods infected with an acanthocephalan parasite, pomphorhynchus laevis. | the acanthocephalan parasite pomphorhynchus laevis (müller, 1776) uses freshwater amphipods as its intermediate host. in order to complete the life cycle, the infected amphipod must be consumed by a fish, where the acanthocephalan will mature and reproduce. parasite transmission, and therefore fitness, could be enhanced if infected amphipods fail to detect or avoid predatory fish. we compared the activity levels of infected and non-infected amphipods, echinogammarus stammeri (karaman, 1931), in ... | 2003 | 14560974 |
| its rdna sequences of pomphorhynchus laevis (zoega in müller, 1776) and p. lucyi williams and rogers, 1984 (acanthocephala: palaeacanthocephala). | the internal transcribed spacers (its-1 and its-2) of the ribosomal rna gene of pomphorhynchus laevis (zoega in müller, 1776) (acanthocephala) isolated from various fish species across central and southern europe were compared with those of p. lucyi williams and rogers, 1984 collected from the largemouth bass micropterus salmonoides boulenger from the usa. the nucleotide sequences of its regions of p. laevis from minnows phoxinus phoxinus (l.) and chub leuciscus cephalus (l.) from two distant lo ... | 2003 | 14574091 |
| [a study on the helminth fauna linked to seasonal changes and size of the fish host, leuciscus cephalus l., from lake dam orenler, afyonkarahisar]. | in this study, the presence of helminths on 103 leuciscus cephalus from the orenler dam lake, turkey was investigated from july 2007 to may 2008. five parasite species were found in the host fish: of these species dactylogyrus vistuale was found in the gills (42.7%, 10.6+/-14.8 parasite/fish), diplostomum sp. in the lens of eyes (12.6%, 4.1+/-4.0), bothriocephalus acheilognathi in the intestine (23.3%, 4.8+/-10.4), ligula intestinalis in the body cavity (12.6%, 2.1+/-1.2), and pomphorhynchus lae ... | 2009 | 19851976 |
| interspecific interactions between acanthocephala in the intestine of brown trout: are they more frequent in ireland? | the aim of this paper was to test the hypothesis that when the 2 species of acanthocephalan pomphorhynchus laevis and acanthocephalus clavula are found concurrently within the intestine of brown trout under field conditions, they have the potential to interact negatively. evidence has shown that acanthocephala are more likely to exhibit negative interactions with their own and other species, under both field and experimental conditions. furthermore, the likelihood of these interactions is increa ... | 2003 | 14636026 |
| parasite virulence when the infection reduces the host immune response. | parasite infections often induce a reduction in host immune response either because of a direct manipulation of the immune system by the parasite or because of energy depletion. although infection-induced immunodepression can favour the establishment of the parasite within the host, a too severe immunodepression may increase the risk of infection with opportunistic pathogens, stopping the period over which the parasite can be transmitted to other hosts. here, we explore how the risk of contracti ... | 2010 | 20200031 |
| is metal accumulation in pomphorhynchus laevis dependent on parasite sex or infrapopulation size? | concentrations of the elements as, cd, co, cu, fe, mn, mo, ni, pb, sn, v, zn were analysed by inductively coupled plasma mass spectrometry (icp-ms) in the acanthocephalan pomphorhynchus laevis and its fish host barbus barbus. a total of 27 barbels were collected from the danube river in autumn 2006 close to the town kozloduy (685 river kilometer) on the bulgarian river bank. fish were divided into 3 groups. according to their p. laevis infrapopulation size hosts were considered as heavily infect ... | 2010 | 20380766 |
| larval morphology, genetic divergence, and contrasting levels of host manipulation between forms of pomphorhynchus laevis (acanthocephala). | studies on parasite species with a wide geographic and ecological range may be confounded by still equivocal taxonomic identification. here, we investigated genetic polymorphism and behavioural changes induced in a common intermediate host, in two different forms of pomphorhynchus laevis based on the morphology of the larval infective stage (cystacanth). a 'smooth type' (s) and a 'wrinkled type' (w) of cystacanth were distinguished based on their surface and shape. we analysed sequence divergenc ... | 2004 | 14711589 |
| the intestinal parasite pomphorhynchus laevis (acanthocephala) from barbel as a bioindicator for metal pollution in the danube river near budapest, hungary. | concentrations of as, al, ag, ba, bi, cd, co, cr, cu, fe, ga, mg, mn, ni, pb, sb, sn, sr, tl, v and zn were analyzed by inductively coupled mass spectrometry (icp-ms) in the intestinal helminth pomphorhynchus laevis and its host barbus barbus. the fish were caught in the danube river downstream of the city of budapest (hungary). ten out of twenty one elements analyzed were found at higher concentrations in the acanthocephalan than in different tissues (muscle, intestine, liver and kidney) of bar ... | 2004 | 15016463 |
| comparison of morphological characters in irish and english populations of the acanthocephalan pomphorhynchus laevis (müller, 1776). | pomphorhynchus laevis is believed on ecological evidence to exist as three strains in the british isles. however, the strains have never been shown to be capable of being distinguished using morphological characters. a morphological comparison was made between a sample of p. laevis from salmo trutta in l. feeagh in the west of ireland and a sample from leuciscus cephalus in r. culm in the south of england. the length and width of the trunk, neck, bulb, proboscis and hooks were measured. the numb ... | 2004 | 15477755 |
| intestinal helminth parasites in flounder platichthys flesus from the river thames: an infracommunity analysis. | an analysis was undertaken of intestinal helminth communities in flounder platichthys flesus from two sites on the river thames. a comparison was made between helminth community richness and diversity from these sites at the component and infracommunity levels. at the component community level, a richer and more diverse parasite community was found in flounder from the tilbury location (marine influence) than that from the lots road location (freshwater influence). at the infracommunity level, m ... | 2004 | 15575985 |
| fish acanthocephalans of the genus pomphorhynchus sp. as globally applicable bioindicators for metal pollution in the aquatic environment? | intestinal helminths of fish, especially the acanthocephalans, have become increasingly interesting as potential bioindicators for heavy metal contamination in aquatic habitats. pomphorhynchus laevis from chub and barbel has been investigated frequently for its ability to take up and bioconcentrate metals within its body. this papers summarizes the present knowledge on p. laevis and its metal bioaccumulation properties in order to evaluate the applicability of species of the pomphorhynchus genus ... | 2004 | 15683038 |
| intraspecific conflict over host manipulation between different larval stages of an acanthocephalan parasite. | competitive interactions between coinfecting parasites are expected to be strong when they affect transmission success. when transmission is enhanced by altering host behaviour, intraspecific conflict can lead to 'coinfection exclusion' by the first-in parasite or to a 'sabotage' of behavioural manipulation by the youngest noninfective parasite. we tested these hypotheses in the acanthocephalan parasite pomphorhynchus laevis, reversing phototaxis in its intermediate host gammarus pulex. no evide ... | 2010 | 20964763 |
| the intestinal parasite pomphorhynchus laevis as a sensitive accumulation indicator for the platinum group metals pt, pd, and rh. | concentrations of the platinum group elements pt, pd, and rh were analyzed by adsorptive cathodic stripping voltammetry (pt, rh) and total-reflection x-ray fluorescence (pd) in the intestinal helminth pomphorhynchus laevis and its host barbus barbus. the fish were caught in the danube river south of the city of budapest (hungary) and were exposed to ground catalytic material for 28 days. following exposure all three precious metals were taken up and accumulated in host organs and the parasites. ... | 2005 | 15721887 |
| response of the gut neuroendocrine system of leuciscus cephalus (l.) to the presence of pomphorhynchus laevis müller, 1776 (acanthocephala). | immunohistochemical tests were applied to sections of intestine of uninfected and pomphorhynchus laevis muller-infected chub, leuciscus cephalus (l.) using 15 different antisera. nerve cell bodies and fibres immunoreactive (ir) to the anti-bombesin, -cholecystokinin-8 (cck-8), -galanin, -gastrin-releasing peptide (-grp), -nitric oxide synthase (-nos), -substance p (-sp), and -vasoactive intestinal peptide (-vip) sera were observed in the myenteric plexus of uninfected chub. the density of nerve ... | 2005 | 15736056 |
| protection first then facilitation: a manipulative parasite modulates the vulnerability to predation of its intermediate host according to its own developmental stage. | many trophically transmitted parasites with complex life cycles manipulate their intermediate host behavior in ways facilitating their transmission to final host by predation. this facilitation generally results from lowering host's antipredatory defenses when the parasite is infective to the final host. however, a recent theoretical model predicts that an optimal parasitic strategy would be to protect the intermediate host from predation when noninfective, before switching to facilitation when ... | 2011 | 21884065 |
| metazoan parasites from herring (clupea harengus l.) as biological indicators in the baltic sea. | zoographical distribution of metazoan fish parasites in herring, clupea harengus, from the baltic sea was analysed in order to use them as potential biological indicators. a total of 210 herring from six different sampling sites were investigated, harbouring 12 different parasite species [five digeneans (d), one cestode (c), three nematodes (n) and three acanthocephalans (a)]. the distribution of the parasite species differed according to region, with a distinct gradient of decreasing species ri ... | 2014 | 25119368 |
| helminthofauna of ohrid gudgeon (gobio ohridanus karaman, 1924) from the lake ohrid, macedonia. | total, 94 specimens of gudgeon (gobio ohridanus karaman, 1924) from the macedonian part of the lake ohrid were examined and 61 fishes (64.89%) were infected with parasites. the presence of 4 parasite species was established: dactylogyrus cryptomeres f. typica (monogenea), cystidicoloides tenuissima and philometra ovata (nematoda), and pomphorhynchus laevis (acanthocephala). the highest prevalence and intensity of infection was with dactylogyrus cryptomeres f. typica (59.57%; mean intensity 6.07) ... | 2015 | 25911039 |
| evolutionary anatomy of the muscular apparatus involved in the anchoring of acanthocephala to the intestinal wall of their vertebrate hosts. | different conceptions exist regarding structure, function, and evolution of the muscles that move the acanthocephalan presoma, including the proboscis, i.e., the usually hooked hold-fast anchoring these endoparasites to the intestinal wall of their vertebrate definitive hosts. in order to clarify the unresolved issues, we carried out a light microscopic analysis of series of semi-thin sections and whole mounts representing the three traditional acanthocephalan classes: archiacanthocephala (macra ... | 2017 | 28233104 |
| understanding trophic interactions in host-parasite associations using stable isotopes of carbon and nitrogen. | stable isotope analysis of carbon and nitrogen can deliver insights into trophic interactions between organisms. while many studies on free-living organisms are available, the number of those focusing on trophic interactions between hosts and their associated parasites still remains scarce. in some cases information about taxa (e.g. acanthocephalans) is completely missing. additionally, available data revealed different and occasionally contrasting patterns, depending on the parasite's taxonomic ... | 2017 | 28212669 |
| histopathology of catostomus commersoni (white sucker) infected with the acanthocephalan pomphorhynchus bulbocolli. | this study was undertaken to assess the damage caused by pomphorhynchus bulbocolli to catostomus commersoni (white sucker). three specimens of c. commersoni were collected during early september 2014 via gill net from canadarago lake (otsego county, new york), then dissected and examined for intestinal parasites. one c. commersoni , collected from a tributary of otsego lake (otsego county, new york), was used as a control in this study because it was not infected with intestinal helminths. upon ... | 2016 | 27341296 |
| interactions of warming and exposure affect susceptibility to parasite infection in a temperate fish species. | predicting how elevated temperatures from climate change alter host-parasite interactions requires understandings of how warming affects host susceptibility and parasite virulence. here, the effect of elevated water temperature and parasite exposure level was tested on parasite prevalence, abundance and burden, and on fish growth, using pomphorhynchus laevis and its fish host squalius cephalus. at 60 days post-exposure, prevalence was higher at the elevated temperature (22 °c) than ambient tempe ... | 2016 | 27225942 |
| seasonal profile of metal accumulation in the acanthocephalan pomphorhynchus laevis: a valuable tool to study infection dynamics and implications for metal monitoring. | a large number of studies demonstrated that acanthocephalans exhibit a high metal accumulation potential and thus can be used as sensitive accumulation indicators. however, similar to free-living bioindicators, a seasonal variation in metal concentrations in parasites might occur. accordingly, the influence of seasonality has to be elucidated if parasites should be applied as sentinels. | 2016 | 27216617 |
| occurrence of immune cells in the intestinal wall of squalius cephalus infected with pomphorhynchus laevis. | a sub-population of 34 specimens of chub, squalius cephalus, was sampled from the river brenta (northern italy) and examined for ecto- and endo-parasites. pomphorhynchus laevis (acanthocephala) was the only enteric helminth encountered. immunofluorescence and ultrastructural studies were conducted on the intestines of chub. near the site of parasite's attachment, mucous cells, mast cells (mcs), neutrophils and rodlet cells (rcs) were found to co-occur within the intestinal epithelium. the number ... | 2015 | 26434712 |
| identifying a key host in an acanthocephalan-amphipod system. | trophically transmitted parasites may use multiple intermediate hosts, some of which may be 'key-hosts', i.e. contributing significantly more to the completion of the parasite life cycle, while others may be 'sink hosts' with a poor contribution to parasite transmission. gammarus fossarum and gammarus roeseli are sympatric crustaceans used as intermediate hosts by the acanthocephalan pomphorhynchus laevis. gammarus roeseli suffers higher field prevalence and is less sensitive to parasite behavio ... | 2015 | 26303006 |
| influence of host nutritional condition on post-infection traits in the association between the manipulative acanthocephalan pomphorhynchus laevis and the amphipod gammarus pulex. | several parasites with complex life-cycles induce phenotypic alterations in their intermediate hosts. according to the host manipulation hypothesis, such phenotypic alterations are supposed to increase the fitness of the parasite at the expense of that of its intermediate hosts through increasing the probability of transmission to next hosts. although the phenomenon has received a large attention, the proximate factors modulating the occurrence and intensity of host manipulation remain poorly kn ... | 2015 | 26223476 |
| enteric neuromodulators and mucus discharge in a fish infected with the intestinal helminth pomphorhynchus laevis. | in vertebrates, the presence of enteric worms can induce structural changes to the alimentary canal impacting on the neuroendocrine system, altering the proper functioning of the gastrointestinal tract and affecting the occurrence and relative density of endocrine cells (ecs). this account represents the first immunohistochemistry and ultrastructure-based study which documents the intimate relationship between the intestinal mucous cells and ecs in a fish-helminth system, investigating the poten ... | 2015 | 26152567 |
| pomphorhynchus laevis (acanthocephala) from the sava river basin: new insights into strain formation, mtdna-like sequences and dynamics of infection. | here we report the genetic variability and presence of mtdna-like sequences of pomphorhynchus laevis from the chub, squalius cephalus, caught at the sampling sites along the sava river and its tributary the sutla river in croatia. sequences of the cytochrome c oxidase subunit 1 (coi) gene of the recovered p. laevis specimens were used for haplotype network construction and phylogenetic analysis. these analyses showed that some specimens contained mitochondrial-like sequences, and they uncovered ... | 2015 | 25728305 |
| fine structure and cellular responses at the host-parasite interface in a range of fish-helminth systems. | a series of ultrastructural-based studies were conducted on the interface region in different fish-helminth systems: (a) an intestinal infection of the cestode monobothrium wageneri in tench, tinca tinca; (b) an extensive intestinal submucosa and mucosal infection in tench by metacercariae of an unidentified digenean trematode; (c) an intestinal infection in brown trout, salmo trutta, by the acanthocephalan dentitruncus truttae; (d) an extraintestinal infection by larvae of the acanthocephalan, ... | 2015 | 25613477 |
| responses of squalius cephalus intestinal mucous cells to pomphorhynchus laevis. | intestinal mucous cell numbers and their glycoconjugate composition were investigated by histochemical methods in uninfected chub, squalius cephalus, and in conspecifics naturally parasitised with the acanthocephalan pomphorhynchus laevis. a sub-population of 42 chub from the river tiber (perugia, italy) were sampled and screened for ecto and endoparasites. no parasites were found in gills and in other visceral organs of chub and p. laevis appeared to be the only enteric worm encountered. in all ... | 2015 | 25486440 |
| multidimensionality in host manipulation mimicked by serotonin injection. | manipulative parasites often alter the phenotype of their hosts along multiple dimensions. 'multidimensionality' in host manipulation could consist in the simultaneous alteration of several physiological pathways independently of one another, or proceed from the disruption of some key physiological parameter, followed by a cascade of effects. we compared multidimensionality in 'host manipulation' between two closely related amphipods, gammarus fossarum and gammarus pulex, naturally and experimen ... | 2014 | 25339729 |
| does fish reproduction and metabolic activity influence metal levels in fish intestinal parasites, acanthocephalans, during fish spawning and post-spawning period? | application of fish intestinal parasites, acanthocephalans, as bioindicators in metal exposure assessment usually involves estimation of their metal levels and bioconcentration factors. metal levels in parasite final host, fishes, are influenced by fish physiology but there is no data for acanthocephalan metal levels. gastrointestinal zn, fe, mn, cd, ag levels in european chub (squalius cephalus l.) from the sava river were significantly higher during chub spawning (april/may) compared to the po ... | 2014 | 25048939 |
| parasite-induced alteration of plastic response to predation threat: increased refuge use but lower food intake in gammarus pulex infected with the acanothocephalan pomphorhynchus laevis. | larvae of many trophically-transmitted parasites alter the behaviour of their intermediate host in ways that increase their probability of transmission to the next host in their life cycle. before reaching a stage that is infective to the next host, parasite larvae may develop through several larval stages in the intermediate host that are not infective to the definitive host. early predation at these stages results in parasite death, and it has recently been shown that non-infective larvae of s ... | 2014 | 24291320 |