MUSEO ARGENTINO DE CIENCIAS NATURALES "BERNARDINO RIVADAVIA"
Unidad Ejecutora - UE
Castrating effects of trematode larvae on reproductive succes of a highly parasitized population of Crepipatella dilatata (Caenogastropoda) in Argentina
GILARDONI, C.; CRISTIÁN ITUARTE; CREMONTE , FLORENCIA
Lugar: Berlin; Año: 2012 vol. 159 p. 2259 - 2259
Crepipatella dilatata (Calyptraeidae) is a common intertidal or shallow subtidal protandric hermaphroditic gastropod. Intertidal snails from Puerto Madryn, Chubut, Argentina (424603700S, 645405100 W), showed a high prevalence, up to 46 %, of a castrating larval microphallid trematode. Reproductive success was studied during a 2-year period from September 2007 to August 2009, and the results were compared to those from an unparasitized subtidal sample. Brooding females and males were never found infected. The proportion ofbrooding females was higher in months with a higher prevalence of infection. The number of brooding females in the intertidal sample was higher than in the subtidal sample.Generalized linear models were utilized to determine the effects of parasitism on the reproductive success of the host population. Anticipated reproduction in smaller females in the intertidal sample, increased reproductive success in months with higher prevalence, and unparasitizedmales are interpreted as fitness responses to ensure host population survival when the prevalence of trematode infection is high.