TitleThe effects of snake predation on metamorphosis of western toads, Bufo boreas (Amphibia, Bufonidae)
Publication TypeJournal Article
Year of Publication1998
AuthorsDeVito, J, Chivers, DP, Kiesecker, JM, Marco, A, Wildy, EL, Blaustein, AR
JournalEthology
Volume104
Pagination185-193
Type of ArticleJournal Article
ISSN0179-1613
Abstract

For some anuran species, synchronous metamorphosis may function as an antipredator adaptation by swamping predators during the period of transformation. We examined the levels of synchrony of emergence from the water of metamorphosing western roads (Bufo boreas) in the presence and absence of a lire snake predator, the common garter snake (Thamnophis sirtalis) in a laboratory experiment. To compare between the treatments, we measured the time to emergence from the mater, the number of metamorphs emerging together, and the level of aggregation (before and during emergence) of the toads in each treatment. There was a difference between the treatments when all three factors were considered. We attributed these differences to a behavioral response in which B. boreas emerged sooner in the presence of the predator, regardless of whether individual toads had reached the point at which they were physically better suited to the terrestrial environment than the larval environment.

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