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...
Published in: | Oecologia |
---|---|
Main Authors: | , , , |
Format: | Text |
Language: | English |
Published: |
Springer Berlin Heidelberg
2021
|
Subjects: | |
Online Access: | http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8585811/ http://www.ncbi.nlm.nih.gov/pubmed/34626270 https://doi.org/10.1007/s00442-021-05045-z |
id |
ftpubmed:oai:pubmedcentral.nih.gov:8585811 |
---|---|
record_format |
openpolar |
spelling |
ftpubmed:oai:pubmedcentral.nih.gov:8585811 2023-05-15T13:59:55+02:00 Complementary use of stable isotopes and fatty acids for quantitative diet estimation of sympatric predators, the Antarctic pack-ice seals Guerrero, A. I. Pinnock, A. Negrete, J. Rogers, T. L. 2021-10-09 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8585811/ http://www.ncbi.nlm.nih.gov/pubmed/34626270 https://doi.org/10.1007/s00442-021-05045-z en eng Springer Berlin Heidelberg http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8585811/ http://www.ncbi.nlm.nih.gov/pubmed/34626270 http://dx.doi.org/10.1007/s00442-021-05045-z © The Author(s) 2021 https://creativecommons.org/licenses/by/4.0/Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . CC-BY Oecologia Ecosystem Ecology–Original Research Text 2021 ftpubmed https://doi.org/10.1007/s00442-021-05045-z 2021-11-21T01:36:45Z 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. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s00442-021-05045-z. Text Antarc* Antarctic Crabeater Seal Euphausia superba Hydrurga leptonyx Leopard Seal Weddell Seal PubMed Central (PMC) Antarctic Hydrurga ENVELOPE(-61.626,-61.626,-64.145,-64.145) The Antarctic Weddell Oecologia 197 3 729 742 |
institution |
Open Polar |
collection |
PubMed Central (PMC) |
op_collection_id |
ftpubmed |
language |
English |
topic |
Ecosystem Ecology–Original Research |
spellingShingle |
Ecosystem Ecology–Original Research Guerrero, A. I. Pinnock, A. Negrete, J. Rogers, T. L. Complementary use of stable isotopes and fatty acids for quantitative diet estimation of sympatric predators, the Antarctic pack-ice seals |
topic_facet |
Ecosystem Ecology–Original Research |
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. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s00442-021-05045-z. |
format |
Text |
author |
Guerrero, A. I. Pinnock, A. Negrete, J. Rogers, T. L. |
author_facet |
Guerrero, A. I. Pinnock, A. Negrete, J. Rogers, T. L. |
author_sort |
Guerrero, A. I. |
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 Berlin Heidelberg |
publishDate |
2021 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8585811/ http://www.ncbi.nlm.nih.gov/pubmed/34626270 https://doi.org/10.1007/s00442-021-05045-z |
long_lat |
ENVELOPE(-61.626,-61.626,-64.145,-64.145) |
geographic |
Antarctic Hydrurga The Antarctic Weddell |
geographic_facet |
Antarctic Hydrurga The Antarctic Weddell |
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 |
Oecologia |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8585811/ http://www.ncbi.nlm.nih.gov/pubmed/34626270 http://dx.doi.org/10.1007/s00442-021-05045-z |
op_rights |
© The Author(s) 2021 https://creativecommons.org/licenses/by/4.0/Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . |
op_rightsnorm |
CC-BY |
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_ |
1766268845169836032 |