TitleThe effects of food level and conspecific density on biting and cannibalism in larval long-toed salamanders, Ambystoma macrodactylum
Publication TypeJournal Article
Year of Publication2001
AuthorsWildy, EL, Chivers, DP, Kiesecker, JM, Blaustein, AR
JournalOecologia
Volume128
Pagination202-209
Type of ArticleJournal Article
ISSN0029-8549
Abstract

Previous studies have examined abiotic and biotic factors that facilitate agonistic behavior. For larval amphibians. food availability and conspecific density have been suggested as important factors influencing intraspecific aggression and cannibalism. In this study, we examined the separate and combined effects of food availability and density on the agonistic behavior and life history of larval long-toed salamanders, Ambystoma macrodactylum. We designed a 2x2 factorial experiment in which larvae were raised with either a high or low density of conspecifics and fed either a high or low level of food. For each treatment, we quantified the amount of group size variation., biting, and cannibalism occurring. Additionally, we examined survival to, time to and size at metamorphosis for all larvae. Results indicated that differences in both density and food level influenced all three life history traits measured. Moreover, differences in food level at which larvae were reared resulted in higher within-group size variation and heightened intraspecific biting while both density and food level contributed to increased cannibalism. We suggest that increased hunger levels and an uneven size structure promoted biting among larvae in the low food treatments. Moreover. these factors combined with a higher encounter rate with conspecifics in the high density treatments may have prompted larger individuals to seek an alternative food source in the form of smaller conspecifics.

URL<Go to ISI>://WOS:000170392500007
DOI10.1007/s004420100641