Phenotypic basis for feeding in insular garter snakes

TitlePhenotypic basis for feeding in insular garter snakes
Publication TypeJournal Article
Year of Publication1983
AuthorsSexton OJ
JournalAmerican Philosophy Society Yearbook

The grantee sought to determine the basis of a dietary shift observed in a population of garter snakes (Thamnophis sirtalis) inhabitating High Island in northern Lake Michigan. Adult High Island snakes feed extensively on the nestlings of a colony of common terns (Sterna hirundo) in contrast to the rare occurrences of avian prey in mainland populations. These latter populations prefer prey such as earthworms and amphibians.