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Titolo:
Responses of bullfrog tadpoles to hypoxia and predators
Autore:
McIntyre, PB; McCollum, SA;
Indirizzi:
Harvard Univ, Cambridge, MA 02138 USA Harvard Univ Cambridge MA USA 02138Harvard Univ, Cambridge, MA 02138 USA Univ Michigan, Dept Biol, Ann Arbor, MI 48109 USA Univ Michigan Ann ArborMI USA 48109 , Dept Biol, Ann Arbor, MI 48109 USA
Titolo Testata:
OECOLOGIA
fascicolo: 2, volume: 125, anno: 2000,
pagine: 301 - 308
SICI:
0029-8549(200010)125:2<301:ROBTTH>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
AMBYSTOMA-TIGRINUM LARVAE; RANA-CATESBEIANA; AMPHIBIAN METAMORPHOSIS; XENOPUS-LAEVIS; BODY SIZE; BEHAVIORAL-RESPONSES; OXYGEN-CONSUMPTION; ANURAN LARVAE; RESPIRATORY RESPONSES; POECILIA-RETICULATA;
Keywords:
air-breathing; Rana catesbeiana; dissolved oxygen; Ambystoma tigrinum; hypoxia;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
63
Recensione:
Indirizzi per estratti:
Indirizzo: McIntyre, PB Cornell Univ, Dept Ecol & Evolutionary Biol, Corson Hall, Ithaca, NY 14853USA Cornell Univ Corson Hall Ithaca NY USA 14853 aca, NY 14853USA
Citazione:
P.B. McIntyre e S.A. McCollum, "Responses of bullfrog tadpoles to hypoxia and predators", OECOLOGIA, 125(2), 2000, pp. 301-308

Abstract

Low dissolved oxygen concentrations present numerous challenges for non-air-breathing aquatic organisms. Amphibian larvae and their predators can respond to oxygen levels by altering their behavior and physiology, but the ecological consequences of these responses are generally unknown. We conducted two laboratory experiments to study the effects of dissolved oxygen on respiratory behavior and susceptibility to predation of larval bullfrogs (Rana catesbeiana). Tn the first, we exposed small, lungless tadpoles to a predatory salamander larva (Ambystoma tigrinum) under high and low oxygen conditions. More tadpoles were consumed in high oxygen tanks than in low ones, presumably because salamanders remained near the surface in the low oxygen tanks while most tadpoles rested on the bottom. Tadpole activity depended onboth oxygen and predator presence: swimming decreased after addition of salamanders under high oxygen, but increased under low oxygen. In the second experiment, we examined the effect of predator chemical cues on the air-breathing rats of large tadpoles with well-developed lungs under low oxygen conditions. In the presence of chemical cues produced by dragonfly larvae consuming bullfrog tadpoles, air-breathing and swimming were significantly reduced relative to controls. These experiments demonstrate the potential impact of dissolved oxygen on predator-prey interactions, and suggest that outcomes depend on the respiratory ecology of both predator and prey.

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Documento generato il 30/11/20 alle ore 16:05:25