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Kangaroo metabolism does not cause the relationship between bone collagen delta15N and water availability

Murphy, B. and Bowman, David (2006). Kangaroo metabolism does not cause the relationship between bone collagen delta15N and water availability. Functional Ecology,20(6):1062-1069.

Document type: Journal Article
Citation counts: Scopus Citation Count Cited 47 times in Scopus Article | Citations

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IRMA ID A00004xPUB63
Title Kangaroo metabolism does not cause the relationship between bone collagen delta15N and water availability
Author Murphy, B.
Bowman, David
Journal Name Functional Ecology
Publication Date 2006
Volume Number 20
Issue Number 6
ISSN 1365-2435   (check CDU catalogue open catalogue search in new window)
Scopus ID 2-s2.0-33750719410
Start Page 1062
End Page 1069
Total Pages 8
Place of Publication UK
Publisher Blackwell Publishing
Field of Research 0602 - Ecology
HERDC Category C1 - Journal Article (DEST)
Abstract 1. A negative relationship between water availability and the abundance of 15N relative to 14N (expressed as δ15N) in the bone collagen of herbivores has been widely reported. However, the relative importance of dietary δ15N and animal metabolism in producing this effect remains unclear. 2. To evaluate the relative importance of these two factors, we examined variation in δ15N of both grass foliage and kangaroo (Macropus spp.) bone collagen. We assessed whether the offset between grass and bone collagen δ15N was constant with respect to water availability. 3. An index of water availability (annual actual evapotranspiration/annual potential evapotranspiration) explained a considerable proportion of the variation in both grass δ15N (R2=0·40) and bone collagen δ15N (R2=0·57), and the slopes of these negative relationships were similar, with a near-constant δ15N offset between grass foliage and bone collagen. 4. This finding suggests that dietary δ15N is the main cause of the negative relationship between kangaroo bone collagen δ15N and water availability, with metabolic factors having little discernible effect.
DOI http://dx.doi.org/10.1111/j.1365-2435.2006.01186.x   (check subscription with CDU E-Gateway service for CDU Staff and Students  check subscription with CDU E-Gateway in new window)
 
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