POPULATION DIFFERENCES IN RESPONSES OF RED-LEGGED FROGS ( RANA AURORA ) TO INTRODUCED BULLFROGS

POPULATION DIFFERENCES IN RESPONSES OF RED-LEGGED FROGS ( RANA AURORA ) TO INTRODUCED BULLFROGS We studied eight populations of the red-legged frog, Rana aurora, to examine responses of allotopic and syntopic tadpoles to the bullfrog, Rana catesbeiana, an introduced predator of R. aurora. We also assessed predation rates by R. catesbeiana on syntopic and allotopic populations of R. aurora. Syntopic R. aurora tadpoles significantly reduced their activity and increased their refuge use when presented with the chemical cues of both tadpoles and adult R. catesbeiana. In contrast, allotopic tadpoles did not significantly alter their behavior in the presence of either R. catesbeiana adults or larvae. Predation by R. catesbeiana was lower in syntopic than in allotopic populations of R. aurora tadpoles. Our results show differential responses of syntopic and allotopic R. aurora tadpoles to larval and adult R. catesbeiana. Syntopic tadpoles avoid predation by R. catesbeiana more efficiently than do tadpoles from allotopic populations. Apparently, individuals that are unfamiliar with novel, introduced organisms may not possess adaptations that would prevent a negative encounter. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Ecology Ecological Society of America

POPULATION DIFFERENCES IN RESPONSES OF RED-LEGGED FROGS ( RANA AURORA ) TO INTRODUCED BULLFROGS

Ecology, Volume 78 (6) – Sep 1, 1997

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Publisher
Ecological Society of America
Copyright
Copyright © 1997 by the Ecological Society of America
Subject
Articles
ISSN
0012-9658
DOI
10.1890/0012-9658%281997%29078%5B1752:PDIROR%5D2.0.CO%3B2
Publisher site
See Article on Publisher Site

Abstract

We studied eight populations of the red-legged frog, Rana aurora, to examine responses of allotopic and syntopic tadpoles to the bullfrog, Rana catesbeiana, an introduced predator of R. aurora. We also assessed predation rates by R. catesbeiana on syntopic and allotopic populations of R. aurora. Syntopic R. aurora tadpoles significantly reduced their activity and increased their refuge use when presented with the chemical cues of both tadpoles and adult R. catesbeiana. In contrast, allotopic tadpoles did not significantly alter their behavior in the presence of either R. catesbeiana adults or larvae. Predation by R. catesbeiana was lower in syntopic than in allotopic populations of R. aurora tadpoles. Our results show differential responses of syntopic and allotopic R. aurora tadpoles to larval and adult R. catesbeiana. Syntopic tadpoles avoid predation by R. catesbeiana more efficiently than do tadpoles from allotopic populations. Apparently, individuals that are unfamiliar with novel, introduced organisms may not possess adaptations that would prevent a negative encounter.

Journal

EcologyEcological Society of America

Published: Sep 1, 1997

Keywords: antipredator behavior ; bullfrogs ; chemical cues ; endangered species ; introduced organisms ; population differences ; predator avoidance ; Rana aurora ; Rana catesbeiana ; red-legged frogs

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