NDLI: Food use is affected by the experience of nest predation: implications for indirect predator effects on clutch size

Content Provider	SpringerLink
Author	Zanette, Liana Y. Hobson, Keith A. Clinchy, Michael Travers, Marc Williams, Tony D.
Copyright Year	2013
Abstract	Indirect predator effects on prey demography include any effect not attributable to direct killing and can be mediated by perceived predation risk. Though perceived predation risk clearly affects foraging, few studies have yet demonstrated that it can chronically alter food intake to an extent that affects demography. Recent studies have used stable isotopes to gauge such chronic effects. We previously reported an indirect predator effect on the size of subsequent clutches laid by song sparrows (Melospiza melodia). Females that experienced frequent experimental nest predation laid smaller clutches and were in poorer physiological condition compared to females not subject to nest predation. Every female was provided with unlimited supplemental food that had a distinctive 13C signature. Here, we report that frequent nest predation females had lower blood δ13C values, suggesting that the experience of nest predation caused them to eat less supplemental food. Females that ate less food gained less fat and were in poorer physiological condition, consistent with the effect on food use contributing to the indirect predator effect on clutch size. Tissue δ15N values corroborated that clutch size was not likely constrained by endogenous resources. Finally, we report that the process of egg production evidently affects egg δ13C values, and this may mask the source of nutrients to eggs. Our results indicate that perceived predation risk may impose food limitation on prey even where food is unlimited and such predator-induced food limitation ought to be added to direct killing when considering the total effect of predators on prey numbers.
Starting Page	1031
Ending Page	1039
Page Count	9
File Format	PDF
ISSN	00298549
Journal	Oecologia
Volume Number	172
Issue Number	4
e-ISSN	14321939
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-01-06
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	Non-consumptive effects Non-lethal predator effects Perceived predation risk Predator–prey interaction Risk effect Ecology Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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