Stable isotope mixing models in analyses of dietary changes of Antarctic fur seal in Fildes Peninsula,Antarctica over the 20th century

Huang Tao; Zhang Can; Cai Siying

doi:10.3969/j.issn.0253-4193.2015.08.011

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Huang Tao, Zhang Can, Cai Siying. Stable isotope mixing models in analyses of dietary changes of Antarctic fur seal in Fildes Peninsula,Antarctica over the 20th century[J]. Haiyang Xuebao, 2015, 37(8): 117-125. doi: 10.3969/j.issn.0253-4193.2015.08.011

Citation:

Huang Tao, Zhang Can, Cai Siying. Stable isotope mixing models in analyses of dietary changes of Antarctic fur seal in Fildes Peninsula,Antarctica over the 20th century[J]. Haiyang Xuebao, 2015, 37(8): 117-125. doi: 10.3969/j.issn.0253-4193.2015.08.011

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Stable isotope mixing models in analyses of dietary changes of Antarctic fur seal in Fildes Peninsula,Antarctica over the 20th century

doi: 10.3969/j.issn.0253-4193.2015.08.011

1.
School of Resources and Environmental Engineering, Anhui University, Hefei 230601, China;School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China
2.
School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China

Received Date: 2014-12-20
Rev Recd Date: 2015-03-12

Abstract

Abstract

Stable isotope analysis has been used powerfully in tracing animal dietary sources. In the recent decades, many mixing models have been exploited to calculate source proportional contributions to a mixture based on stable isotope analyses. Here we present a case study by using Euclidean, Linear and Bayesian stable isotope mixing models to calculate proportion of Euphausia superba, Electrona antarctica and Gymnoscopelus nicholsi in Antarctic fur seal (Arctocephalus gazelle) diets over the 20th century. The Euphausia superba proportions in fur seal diets obtained from formula (1) and (2) of Euclidean method show a rising trend over the 20th century, similar to those δ¹⁵N of fur seal hairs. While the results given by formula (3) of Euclidean, Linear and Bayesian models show a declining trend, which are in accord with those recent changes in regional climate, sea ice extent and the observational Euphausia superba density. The results here can be used to study the biological response to climate change in a long time period. The calculated decline of krill proportion in seal diets over the past century indicates a decreasing trend of Euphausia superba population which is very likely due to the recent rapid regional warming and sea ice loss. Our results suggest that recent warming in the West Antarctic Peninsula has had an obvious impact on the regional marine food chains.
- stable isotope mixing model,
- bayesian mixing model,
- SIAR,
- Antarctic fur seal,
- dietary change,
- Antarctica

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References(28)

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