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  • 1
    ISSN: 1573-5117
    Keywords: Corophium ; Hydrobia ; intertidal mud flats ; microphallid trematodes ; phenology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The phenology of microphallid trematodes within their intermediate hostpopulations has been studied on an intertidal mud flat. The parasites usethe mud snail Hydrobia ulvae and the infaunal amphipod Corophium volutatoras first and secondary intermediate host, respectively. Migratory shorebirdsact as final hosts. Our results show a general trend of decline in thedensity of infected intermediate hosts during both spring and autumn, whichcould mainly be ascribed to shorebird predation. During summer the densityof both infected snails and infected amphipods increased considerably, witha culmination in June within the snail population (1000 infectedm-2 and in August within the amphipod population (40 000infected m-2. This time lag in parasite occurrence could berelated to (1) the development time of larval trematodes within the snails,(2) higher ambient temperatures in late summer increasing parasitetransmission between snails and amphipods during this period, and (3) ageneral increase in the Corophium population during late summer. Fromsamples collected between 1990 and 1995 it is shown that microphallidtrematodes occasionally may give rise to mass mortality in the amphipodpopulation. The prerequisites for such an event are a high parasiteprevalence within the first intermediate host population and unusually highambient temperatures, facilitating parasite transmission to the secondaryintermediate host, C. volutator.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Hydrobiologia 418 (2000), S. 243-246 
    ISSN: 1573-5117
    Keywords: Biomphalaria glabrata ; Hydrobia ulvae ; epibiosis ; fouling ; trematodes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A sample of mud snails Hydrobia ulvae (Prosobranchia) from an intertidal population revealed that the shells of trematode-infected specimens were especially likely to be fouled with epibionts. Experimentally trematode-infected Biomphalaria glabrata (Pulmonata) appeared to be especially prone to develop epigrowth in comparison with uninfected conspecifics as well. These findings suggest an interaction between trematode infections and epibiosis in aquatic gastropods. The two most likely explanations for this are (1) that trematode infections weakens the snails' natural defences against epibionts, or (2) that the defences against epibionts also are effective against invading trematodes, causing snail specimens with a particularly good fouling defence to be less likely to become infected.
    Type of Medium: Electronic Resource
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