Nordic Society Oikos The Marine Snail , Cerithidea californica , Matures at Smaller Sizes Where Parasitism Is High
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منابع مشابه
A correlated response of a parasite's virulence and life cycle to selection on its host's life history
Since the observation that snails exposed to trematode parasites bring forward their maturity and increase their fecundity to lessen the parasite's impact on their reproductive success (Minchella & Loverde, 1981; Minchella, 1985), several studies have considered modi®cations of a host's life history as its adaptive response to parasite pressure (Michalakis & Hochberg, 1994). The marine snail Ce...
متن کاملEffects of parasitic castration on growth, reproduction and population dynamics of the marine snail Cerithidea californica
I investigated the prediction that parasitic castrators can reduce host population density. A survey of the salt marsh snail Cerithidea californica suggested a negative association between snail density and the prevalence of larval trematodes which castrate parasitized snails. Field experiments were conducted to determine the mechanisms by which larval trematodes might affect snail populat ion~...
متن کاملEffects of body size and resource availability on dispersal in a native and a non-native estuarine snail.
I manipulated snail densities of two coexisting species of salt marsh snail, Cerithidea californica Haldeman (native) and Batillaria attramentaria Sowerby (non-indigenous) to investigate how resource levels set by intraspecific competition may influence dispersal rates. I used two distinct size classes of the snails (mature and immature) to determine if the effects of competition on dispersal d...
متن کاملExposing the Mechanism and Timing of Impact of Nonindigenous Species on Native Species
The nonnative mudsnail Batillaria attramentaria was introduced to the west coast of North America in the early part of this century and has been displacing the native mudsnail Cerithidea californica on a marsh-by-marsh basis. We combined detailed, quantitative field data on this invader and its interactions with the native snail in an individualbased model that allowed us to address both genera...
متن کاملPhenotypic plasticity in the life history of the mangrove snail Cerithidea scelariiormis
Although phenotypic variation is commonly observed among populations. the relative contribution of genetic and environmental conditions to phenotypic expression, including life history traits, is often unresolved. We measured characteristics of several isolated populations of the mangrove snail Cerithidea scalariformis across 2 habitat regimes (exposed marsh and forested mangrove marsh) and fou...
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