Search results for "Parasitic castration"

showing 3 items of 3 documents

Effects of two acanthocephalan parasites on the fecundity and pairing status of female Gammarus pulex (Crustacea: Amphipoda)

2002

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 P. laevis only showed reduced fecundity. The oocytes of P. laevis-infected females showed a similar structure to those of uninfected females, although infected females had a higher proportion of ooc…

0106 biological sciencesHelminthiasisZoology[SDV.BID]Life Sciences [q-bio]/Biodiversity010603 evolutionary biology01 natural sciencesAcanthocephala03 medical and health sciencesSexual Behavior AnimalGammarus roeseliCrustaceaReproductive biologyAnimalsEcology Evolution Behavior and SystematicsComputingMilieux_MISCELLANEOUS030304 developmental biology[ SDV.BID ] Life Sciences [q-bio]/Biodiversity0303 health sciencesbiologyEcologyIntermediate hostParasitic castrationbiology.organism_classificationFecundityGammarus pulexFertilityPomphorhynchus laevisFemaleVitellogenesis
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Digenean parasites of the bivalve mollusc Pisidium amnicum in a small river in eastern Finland

1998

The host-parasite relationship between digeneans and a semelparous population of the mollusc. Pisidium amnicum Müller in a small river in eastern Finland was studied during 1992/1993. The parasite prevalence of the population was high. The total prevalence was 45.6% in 1992 (n = 790) and 47.5% in 1993 (n = 160). The dominant digenean, Bunodera luciopercae (34.2% in 1992, 35.0% in 1993), had highest prevalences in July/August and in winter. Two other species, Palaeorchis crassus (7.8% in 1992, 7.5% in 1993) and Phyllodistomum elongatum (4.7% and 5.0%), were rare during the winter. The prevalence of B. luciopercae increased as clams aged, while the other species were most common in middle-siz…

PopulationZoologyFresh WaterTrematode InfectionsDisease VectorsAquatic ScienceBiologyDigeneaHost-Parasite InteractionsFish DiseasesAnimalseducationMolluscaFinlandEcology Evolution Behavior and Systematicseducation.field_of_studyEcologyIntermediate hostBivalviabiology.organism_classificationParasitic castrationBivalviaPerciformesPisidium amnicumPerchesTrematodaTrematodaDiseases of Aquatic Organisms
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Effect of starvation on parasite-induced mortality in a freshwater snail (Potamopyrgus antipodarum).

1999

The level of host exploitation is expected, under theory, to be selected to maximise (subject to constraints) the lifetime reproductive success of the parasite. Here we studied the effect of two castrating trematode species on their intermediate snail host, Potamopyrgus antipodarum. One of the trematode species, Microphallus sp., encysts in the snail host and the encysted larvae “hatch” following ingestion of infected snails by birds. The other species, Notocotylus gippyensis, by contrast, releases swimming larvae; ingestion of the snail host is not required for, and does not aid, transmission to the final host. We isolated field-collected snails for 3 months in the laboratory, and followed…

biologyEcologyPotamopyrgusfungiZoologyParasitismSnailbiology.organism_classificationParasitic castrationFreshwater snailbiology.animalparasitic diseasesMicrophallusTrematodaEcology Evolution Behavior and SystematicsPotamopyrgus antipodarumOecologia
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