What are the evolutionary constraints on larval growth in a trophically transmitted parasite?

ABSTRACT: For organisms with a complex life cycle, a large larval size is generally beneficial, but it may come at the expense of prolonged development. Individuals that grow fast may avoid this tradeoff and switch habitats at both a larger size and younger age. A fast growth rate itself can be costly, however, as it requires greater resource intake. For parasites, fast larval growth is assumed to increase the likelihood of host death before transmission to the next host occurs. Using the tapeworm Schistocephalus solidus in its copepod first intermediate host, I investigated potential constraints in the parasite's larval life history. Fast-growing parasites developed infectivity earlier, indicating there is no functional tradeoff between size and developmental time. There was significant growth vari

SUBMITTER: Benesh DP 

PROVIDER: S-EPMC2821511 | biostudies-literature | 2010 Mar

REPOSITORIES: biostudies-literature