Digenean parasitism and the origin and consequences of apomictic parthenogenesis in a freshwater snail, Campeloma decisum

TitleDigenean parasitism and the origin and consequences of apomictic parthenogenesis in a freshwater snail, Campeloma decisum
Publication TypeThesis
Year of Publication1990
AuthorsJohnson SG
DegreeDoctor of Philosophy
Number of Pages105 pp.
UniversityUniversity of Kansas
CityLawrence, KS
KeywordsTREMATODES
Abstract

The role of parasites in the evolution of sex has begun to receive considerable attention in recent years. In this dissertation I examine the effects of digenetic trematodes on the origin and consequences of apomictic parthenogenesis in a freshwater snail. I argue that the metacercariae stage of Leuchochloridiomorpha constantiae may have caused the origin of parthenogensis in the freshwater snail, Campeloma decisum, by the ingestion of sperm, resulting in severe sperm limitation. Electrophoretic analysis suggests that an alternative hypothesis, namely hybridization between genetically-divergent sexual ancestors, was not necessary for the origin of parthenogensis in this snail.