NDLI: The isotopic composition and insect content of diet predict tissue isotopic values in a South American passerine assemblage

Content Provider	Springer Nature Link
Author	Sabat, Pablo Ramirez Otarola, Natalia Bozivic, Francisco Rio, Carlos Martínez
Copyright Year	2012
Abstract	We analyzed the carbon and nitrogen isotopic values of the muscle, liver, and crop contents (“diet”) of 132 individuals of 16 species of Chilean birds. The nitrogen content of diet was tightly correlated with the fraction of gut contents represented by insects relative to plant material. The carbon and nitrogen isotopic values of diet, liver, and muscle were all linearly correlated, implying high temporal consistency in the isotopic value of the diet of these birds. However, δ15N was not significantly related with the percentage of insects in diet. These results cast doubt on the applicability of the use of 15N enrichment to diagnose trophic level in, at least some, terrestrial ecosystems. However, the residuals of the relationship relating the isotopic value of bird tissues with those of their diet were weakly negatively correlated with insect intake. We hypothesize that this negative correlation stems from the higher quality of protein found in insects relative to that of plant materials. Finally, our data corroborated a perplexing and controversial negative relationship between tissue to diet isotopic discrimination and the isotopic value of diet. We suggest that this relationship is an example of the commonly observed regression to the mean effect that plagues many scientific studies.
Starting Page	419
Ending Page	430
Page Count	12
File Format	PDF
ISSN	01741578
Journal	Journal of Comparative Physiology B
Volume Number	183
Issue Number	3
e-ISSN	1432136X
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-09-27
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Stable isotope Diet Birds Animal Physiology Biomedicine general Human Physiology Zoology Biochemistry
Content Type	Text
Resource Type	Article
Subject	Physiology Biochemistry Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Endocrinology

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