NDLI: Food or fear: hunger modifies responses to injured conspecifics in tadpoles

Content Provider	Springer Nature Link
Author	Carlson, Bradley E. Newman, Jillian C. Langkilde, Tracy
Copyright Year	2014
Abstract	Animals must balance the conflicting needs to forage and avoid predation. The optimal balance of risk and reward should depend on the individual’s state, particularly hunger status. Satiated individuals are hypothesized to react more strongly to risk than hungry individuals, for which the necessity for food overrides perceived danger. We tested this in wood frog (Lithobates sylvaticus) tadpoles by comparing the response of fasted and fed tadpoles to injured conspecifics (alarm cue) and uninjured conspecifics (control). Food restriction significantly affected the activity levels of tadpoles and the impact of injured conspecific cues on activity. Fed tadpoles responded little to these cues, tending to decrease activity. Hungry tadpoles were more active overall and responded to injured conspecific cues by increasing activity. We propose that hungry tadpoles increase their activity in response to an injured conspecific because, in addition to indicating danger, this cue represents a nutrient source for this opportunistically cannibalistic species, and hungry tadpoles should thus adopt risky behavior to acquire this valuable resource. Differences in hunger may therefore explain variation among studies of tadpole responses to injured conspecifics. Future studies in aquatic organisms should consider the role of hunger status when assessing antipredator behavior.
Starting Page	299
Ending Page	308
Page Count	10
File Format	PDF
ISSN	00188158
Journal	Hydrobiologia
Volume Number	743
Issue Number	1
e-ISSN	15735117
Language	English
Publisher	Springer International Publishing
Publisher Date	2014-09-24
Publisher Place	Cham
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Alarm cues Antipredator behavior Cannibalism Hunger Predation risk State-dependent behavior Freshwater & Marine Ecology Ecology Zoology
Content Type	Text
Resource Type	Article
Subject	Aquatic Science

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