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Degradation of chemical alarm cues under natural conditions: risk assessment by larval woodfrogs

CHEMOECOLOGY : Volume 17, Issue 3, September 2007

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Degradation of chemical alarm cues under natural conditions: risk assessment by larval woodfrogs

Content Provider	Springer Nature Link
Author	Ferrari, Maud C. O. Messier, François Chivers, Douglas P.
Copyright Year	2007
Abstract	Many aquatic species use chemosensory information to assess predation risk. The cues used in such risk assessment can come either from the predator (predator odour) or from injured prey (alarm cues). The information conveyed through chemicals may, however, be inaccurate both spatially and temporally, as chemicals may persist in the environment long after the predator is gone. Thus, the level of accuracy of the cues for risk assessment may depend on the persistency of the chemicals in the habitat. Here, we investigated the persistency of alarm cues of a larval amphibian, the woodfrog (Rana sylvatica) in a ephemeral pond, their natural habitat. We introduced either alarm cues or control water in enclosed sleeves (~10 L) installed in the pond. The sleeve water was then sampled after 5 min and every two hours for eight hours. We used the behavioural response of woodfrog tadpoles to alarm cues as a bioassay to assess how long the alarm cues persisted in the environment. We found that tadpoles responded with an antipredator response to the pond water containing alarm cues 5 min after the injection of the cues in the sleeves but did not respond to that same pond water after two hours. Our results indicate that biodegradation and/or photodegradation of alarm cues in natural habitats might occur relatively quickly as the loss of a response to the cues in our experiment was independent of a dilution effect. This contrasts with previous laboratory results indicating that chemicals may be active after several hours.
Starting Page	263
Ending Page	266
Page Count	4
File Format	PDF
ISSN	09377409
Journal	CHEMOECOLOGY
Volume Number	17
Issue Number	4
e-ISSN	14230445
Language	English
Publisher	SP Birkhäuser Verlag Basel
Publisher Date	2007-09-17
Publisher Place	Basel
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Alarm cues degradation persistency field experiment risk assessment larval woodfrog Rana sylvatica Nature Conservation Ecology
Content Type	Text
Resource Type	Article
Subject	Biochemistry Ecology, Evolution, Behavior and Systematics

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Assessment by larval woodfrogs.

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Degradation of chemical alarm cues and assessment of risk throughout the day

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Degradation of chemical alarm cues and assessment of risk throughout the day

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Degradation of chemical alarm cues under natural conditions: risk assessment by larval woodfrogs

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