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Effects of Predator Chemical Cues and Behavioral Biorhythms on Foraging, Activity of Terrestrial Salamanders

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Abstract

Red-backed salamanders, Plethodon cinereus, show a variety of alarm responses to chemical cues from eastern garter snakes, Thamnophis sirtalis. We measured the foraging activity of red-backed salamanders exposed to water soiled by a garter snake (fed P. cinereus) or to unsoiled water. Salamanders exposed to snake-soiled water showed less foraging activity than salamanders exposed to unsoiled water; therefore, predators could have nonlethal effects on salamander populations. Our results also show additional factors influenced salamander foraging activity. Salamander foraging activity and responsiveness to chemical cues do not appear to have been affected by sex or food deprivation. Salamander foraging activity does appear to have been influenced by activity biorhythms. Foraging activity of animals in both treatments showed a bimodal periodicity that is consistent with natural activity patterns controlled by internal biorhythms. Exposure to snake-soiled water significantly reduced foraging activity during periods of peak foraging activity, but had a subtler effect0 on foraging activity during natural lulls in activity. We suggest that both activity biorhythms and exposure to chemical cues are important factors affecting salamander foraging behavior.

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Authors and Affiliations

  1. Department of Biological Sciences, State University of New York at Binghamton, Binghamton, New York, 13902-6000

    John C. Maerz, Nova L. Panebianco & Dale M. Madison

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  1. John C. Maerz
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  2. Nova L. Panebianco
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  3. Dale M. Madison
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Maerz, J.C., Panebianco, N.L. & Madison, D.M. Effects of Predator Chemical Cues and Behavioral Biorhythms on Foraging, Activity of Terrestrial Salamanders. J Chem Ecol 27, 1333–1344 (2001). https://doi.org/10.1023/A:1010309108210

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