In:
Canadian Journal of Fisheries and Aquatic Sciences, Canadian Science Publishing, Vol. 74, No. 8 ( 2017-08), p. 1291-1297
Abstract:
Compound-specific nitrogen stable isotope analysis provides an approach for estimating animal trophic position that may overcome key issues associated with stable isotope analysis of bulk tissue. Yet compound-specific trophic discrimination factors have not been estimated for a broad range of habitats, taxa, and diets. We conducted a controlled-feeding experiment to characterize the variation in compound-specific (TDF AA ) and bulk (TDF Bulk ) trophic discrimination factors of four freshwater fish species fed on three distinct diets. We also compared TDF AA of fish muscle and scale to evaluate the viability of scales for making food web inferences. Mean ± 1 SD TDF Bulk was 2.2‰ ± 0.9‰, and there were significant effects of species and diet trophic position on TDF Bulk . Mean ± 1 SD TDF AA was 6.9‰ ± 0.8‰. Although there was no effect of species on TDF AA , there were significant differences in TDF AA across the three diets. TDF AA from fish scales were not significantly different from those of muscle. Our study illustrates the advantages of estimating trophic position using compound-specific stable isotopes and the need for continued investigation of factors resulting in variation in TDF values.
Type of Medium:
Online Resource
ISSN:
0706-652X
,
1205-7533
DOI:
10.1139/cjfas-2016-0420
Language:
English
Publisher:
Canadian Science Publishing
Publication Date:
2017
detail.hit.zdb_id:
7966-2
detail.hit.zdb_id:
1473089-3
SSG:
21,3
SSG:
12
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