| selection by parasites in spate conditions in wild trinidadian guppies (poecilia reticulata). | gyrodactylids are ubiquitous fish parasites and yet, with the notable exception of gyrodactylus salaris, few studies have reported the effect of these parasites on host survival in natural populations. here, we assess the impact of the parasite load of gyrodactylids (g. turnbulli and g. bullatarudis) on the survival and migration of guppies (poecilia reticulata) in their natural habitat of the aripo river in trinidad. the recapture rate of males declined by 19% with every additional parasite, a ... | 2007 | 17307185 |