Complementary use of stable isotopes and fatty acids for quantitative diet estimation of sympatric predators, the Antarctic pack-ice seals
The quantitative use of stable isotopes (SIs) for trophic studies has seen a rapid growth whereas fatty acid (FA) studies remain mostly qualitative. We apply the Bayesian tool MixSIAR to both SI and FA data to estimate the diet of three sympatric predators: the crabeater (Lobodon carcinophaga), Wedd...
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Springer Nature
2021
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ftunswworks:oai:unsworks.library.unsw.edu.au:1959.4/unsworks_79725 2024-05-19T07:32:26+00:00 Complementary use of stable isotopes and fatty acids for quantitative diet estimation of sympatric predators, the Antarctic pack-ice seals Guerrero, AI Pinnock, A Negrete, J Rogers, TL 2021-11-01 application/pdf http://hdl.handle.net/1959.4/unsworks_79725 https://unsworks.unsw.edu.au/bitstreams/cf8849dc-ab85-4f6c-95d2-d2f84f6603a2/download https://doi.org/10.1007/s00442-021-05045-z unknown Springer Nature http://hdl.handle.net/1959.4/unsworks_79725 https://unsworks.unsw.edu.au/bitstreams/cf8849dc-ab85-4f6c-95d2-d2f84f6603a2/download https://doi.org/10.1007/s00442-021-05045-z open access https://purl.org/coar/access_right/c_abf2 CC BY https://creativecommons.org/licenses/by/4.0/ free_to_read urn:ISSN:0029-8549 urn:ISSN:1432-1939 Oecologia, 197, 3, 729-742 Nutrition Animals Antarctic Regions Bayes Theorem Diet Fatty Acids Humans Isotopes Seals Earless Biochemical tracer Blubber Marine mammal Pinniped Trophic marker anzsrc-for: 0602 Ecology journal article http://purl.org/coar/resource_type/c_6501 2021 ftunswworks https://doi.org/10.1007/s00442-021-05045-z 2024-04-24T00:45:16Z The quantitative use of stable isotopes (SIs) for trophic studies has seen a rapid growth whereas fatty acid (FA) studies remain mostly qualitative. We apply the Bayesian tool MixSIAR to both SI and FA data to estimate the diet of three sympatric predators: the crabeater (Lobodon carcinophaga), Weddell (Leptonychotes weddellii) and leopard seal (Hydrurga leptonyx). We used SI data of their vibrissae and FA data of their outer blubber to produce comparable diet estimates for the same individuals. Both SI and FA models predicted the same main diet components, although the predicted proportions differed. For the crabeater seal, both methods identified krill, Euphausia superba, as the main, and almost exclusive, food item, although the FA model estimated a slightly lower proportion, potentially due to the low lipid content of krill compared to the fish species used in the model. For the Weddell seal the FA model identified the fish Pleuragramma antarcticum as the most important prey, whereas the SI model was not able to distinguish among prey species, identifying a ‘fish-squid’ group as the main diet component. For the leopard seal, both models identified krill as the main contributor; however, the predicted proportions for the secondary sources differed. Although vibrissae and outer blubber may not represent the same timeframe, the use of MixSIAR with FA data provides diet estimates comparable to those obtained with SI data, thus, both approaches were complimentary. The use of both biotracers offers a feasible option to study diets of wild animals in a quantitative manner. Article in Journal/Newspaper Antarc* Antarctic Crabeater Seal Euphausia superba Hydrurga leptonyx Leopard Seal Weddell Seal UNSW Sydney (The University of New South Wales): UNSWorks Oecologia 197 3 729 742 |
institution |
Open Polar |
collection |
UNSW Sydney (The University of New South Wales): UNSWorks |
op_collection_id |
ftunswworks |
language |
unknown |
topic |
Nutrition Animals Antarctic Regions Bayes Theorem Diet Fatty Acids Humans Isotopes Seals Earless Biochemical tracer Blubber Marine mammal Pinniped Trophic marker anzsrc-for: 0602 Ecology |
spellingShingle |
Nutrition Animals Antarctic Regions Bayes Theorem Diet Fatty Acids Humans Isotopes Seals Earless Biochemical tracer Blubber Marine mammal Pinniped Trophic marker anzsrc-for: 0602 Ecology Guerrero, AI Pinnock, A Negrete, J Rogers, TL Complementary use of stable isotopes and fatty acids for quantitative diet estimation of sympatric predators, the Antarctic pack-ice seals |
topic_facet |
Nutrition Animals Antarctic Regions Bayes Theorem Diet Fatty Acids Humans Isotopes Seals Earless Biochemical tracer Blubber Marine mammal Pinniped Trophic marker anzsrc-for: 0602 Ecology |
description |
The quantitative use of stable isotopes (SIs) for trophic studies has seen a rapid growth whereas fatty acid (FA) studies remain mostly qualitative. We apply the Bayesian tool MixSIAR to both SI and FA data to estimate the diet of three sympatric predators: the crabeater (Lobodon carcinophaga), Weddell (Leptonychotes weddellii) and leopard seal (Hydrurga leptonyx). We used SI data of their vibrissae and FA data of their outer blubber to produce comparable diet estimates for the same individuals. Both SI and FA models predicted the same main diet components, although the predicted proportions differed. For the crabeater seal, both methods identified krill, Euphausia superba, as the main, and almost exclusive, food item, although the FA model estimated a slightly lower proportion, potentially due to the low lipid content of krill compared to the fish species used in the model. For the Weddell seal the FA model identified the fish Pleuragramma antarcticum as the most important prey, whereas the SI model was not able to distinguish among prey species, identifying a ‘fish-squid’ group as the main diet component. For the leopard seal, both models identified krill as the main contributor; however, the predicted proportions for the secondary sources differed. Although vibrissae and outer blubber may not represent the same timeframe, the use of MixSIAR with FA data provides diet estimates comparable to those obtained with SI data, thus, both approaches were complimentary. The use of both biotracers offers a feasible option to study diets of wild animals in a quantitative manner. |
format |
Article in Journal/Newspaper |
author |
Guerrero, AI Pinnock, A Negrete, J Rogers, TL |
author_facet |
Guerrero, AI Pinnock, A Negrete, J Rogers, TL |
author_sort |
Guerrero, AI |
title |
Complementary use of stable isotopes and fatty acids for quantitative diet estimation of sympatric predators, the Antarctic pack-ice seals |
title_short |
Complementary use of stable isotopes and fatty acids for quantitative diet estimation of sympatric predators, the Antarctic pack-ice seals |
title_full |
Complementary use of stable isotopes and fatty acids for quantitative diet estimation of sympatric predators, the Antarctic pack-ice seals |
title_fullStr |
Complementary use of stable isotopes and fatty acids for quantitative diet estimation of sympatric predators, the Antarctic pack-ice seals |
title_full_unstemmed |
Complementary use of stable isotopes and fatty acids for quantitative diet estimation of sympatric predators, the Antarctic pack-ice seals |
title_sort |
complementary use of stable isotopes and fatty acids for quantitative diet estimation of sympatric predators, the antarctic pack-ice seals |
publisher |
Springer Nature |
publishDate |
2021 |
url |
http://hdl.handle.net/1959.4/unsworks_79725 https://unsworks.unsw.edu.au/bitstreams/cf8849dc-ab85-4f6c-95d2-d2f84f6603a2/download https://doi.org/10.1007/s00442-021-05045-z |
genre |
Antarc* Antarctic Crabeater Seal Euphausia superba Hydrurga leptonyx Leopard Seal Weddell Seal |
genre_facet |
Antarc* Antarctic Crabeater Seal Euphausia superba Hydrurga leptonyx Leopard Seal Weddell Seal |
op_source |
urn:ISSN:0029-8549 urn:ISSN:1432-1939 Oecologia, 197, 3, 729-742 |
op_relation |
http://hdl.handle.net/1959.4/unsworks_79725 https://unsworks.unsw.edu.au/bitstreams/cf8849dc-ab85-4f6c-95d2-d2f84f6603a2/download https://doi.org/10.1007/s00442-021-05045-z |
op_rights |
open access https://purl.org/coar/access_right/c_abf2 CC BY https://creativecommons.org/licenses/by/4.0/ free_to_read |
op_doi |
https://doi.org/10.1007/s00442-021-05045-z |
container_title |
Oecologia |
container_volume |
197 |
container_issue |
3 |
container_start_page |
729 |
op_container_end_page |
742 |
_version_ |
1799470475453136896 |