Trophic ecology of Mexican Pacific harbor seal colonies using carbon and nitrogen stable isotopes
There is limited information that provides a comprehensive understanding of the trophic ecology of Mexican Pacific harbor seal (Phoca vitulina richardii) colonies. While scat analysis has been used to determine the diet of some colonies, the integrative characterization of its feeding habits on broa...
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ftpubmed:oai:pubmedcentral.nih.gov:6975529 2023-05-15T16:33:05+02:00 Trophic ecology of Mexican Pacific harbor seal colonies using carbon and nitrogen stable isotopes Juárez-Rodríguez, Maricela Heckel, Gisela Herguera-García, Juan Carlos Elorriaga-Verplancken, Fernando R. Herzka, Sharon Z. Schramm, Yolanda 2020-01-22 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6975529/ http://www.ncbi.nlm.nih.gov/pubmed/31967988 https://doi.org/10.1371/journal.pone.0225889 en eng Public Library of Science http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6975529/ http://www.ncbi.nlm.nih.gov/pubmed/31967988 http://dx.doi.org/10.1371/journal.pone.0225889 © 2020 Juárez-Rodríguez et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. CC-BY Research Article Text 2020 ftpubmed https://doi.org/10.1371/journal.pone.0225889 2020-02-09T01:21:58Z There is limited information that provides a comprehensive understanding of the trophic ecology of Mexican Pacific harbor seal (Phoca vitulina richardii) colonies. While scat analysis has been used to determine the diet of some colonies, the integrative characterization of its feeding habits on broader temporal and spatial scales remains limited. We examined potential feeding grounds, trophic niche width, and overlap, and inferred the degree of dietary specialization using stable carbon and nitrogen isotope ratios (δ(13)C and δ(15)N) in this subspecies. We analyzed δ(13)C and δ(15)N on fur samples from pups collected at five sites along the western coast of the Baja California Peninsula, Mexico. Fur of natal coat of Pacific harbor seal pups begins to grow during the seventh month in utero until the last stage of gestation. Therefore pup fur is a good proxy for the mother’s feeding habits in winter (~December to March), based on the timing of gestation for the subspecies in this region. Our results indicated that the δ(13)C and δ(15)N values differed significantly among sampling sites, with the highest mean δ(15)N value occurring at the southernmost site, reflecting a well-characterized north to south latitudinal (15)N-enrichment in the food web. The tendency identified in δ(13)C values, in which the northern colonies showed the most enriched values, suggests nearshore and benthic-demersal feeding habits. A low variance in δ(13)C and δ(15)N values for each colony (<1‰) and relatively small standard ellipse areas suggest a specialized foraging behavior in adult female Pacific harbor seals in Mexican waters. Text harbor seal Phoca vitulina PubMed Central (PMC) Baja Pacific PLOS ONE 15 1 e0225889 |
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Research Article Juárez-Rodríguez, Maricela Heckel, Gisela Herguera-García, Juan Carlos Elorriaga-Verplancken, Fernando R. Herzka, Sharon Z. Schramm, Yolanda Trophic ecology of Mexican Pacific harbor seal colonies using carbon and nitrogen stable isotopes |
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Research Article |
description |
There is limited information that provides a comprehensive understanding of the trophic ecology of Mexican Pacific harbor seal (Phoca vitulina richardii) colonies. While scat analysis has been used to determine the diet of some colonies, the integrative characterization of its feeding habits on broader temporal and spatial scales remains limited. We examined potential feeding grounds, trophic niche width, and overlap, and inferred the degree of dietary specialization using stable carbon and nitrogen isotope ratios (δ(13)C and δ(15)N) in this subspecies. We analyzed δ(13)C and δ(15)N on fur samples from pups collected at five sites along the western coast of the Baja California Peninsula, Mexico. Fur of natal coat of Pacific harbor seal pups begins to grow during the seventh month in utero until the last stage of gestation. Therefore pup fur is a good proxy for the mother’s feeding habits in winter (~December to March), based on the timing of gestation for the subspecies in this region. Our results indicated that the δ(13)C and δ(15)N values differed significantly among sampling sites, with the highest mean δ(15)N value occurring at the southernmost site, reflecting a well-characterized north to south latitudinal (15)N-enrichment in the food web. The tendency identified in δ(13)C values, in which the northern colonies showed the most enriched values, suggests nearshore and benthic-demersal feeding habits. A low variance in δ(13)C and δ(15)N values for each colony (<1‰) and relatively small standard ellipse areas suggest a specialized foraging behavior in adult female Pacific harbor seals in Mexican waters. |
format |
Text |
author |
Juárez-Rodríguez, Maricela Heckel, Gisela Herguera-García, Juan Carlos Elorriaga-Verplancken, Fernando R. Herzka, Sharon Z. Schramm, Yolanda |
author_facet |
Juárez-Rodríguez, Maricela Heckel, Gisela Herguera-García, Juan Carlos Elorriaga-Verplancken, Fernando R. Herzka, Sharon Z. Schramm, Yolanda |
author_sort |
Juárez-Rodríguez, Maricela |
title |
Trophic ecology of Mexican Pacific harbor seal colonies using carbon and nitrogen stable isotopes |
title_short |
Trophic ecology of Mexican Pacific harbor seal colonies using carbon and nitrogen stable isotopes |
title_full |
Trophic ecology of Mexican Pacific harbor seal colonies using carbon and nitrogen stable isotopes |
title_fullStr |
Trophic ecology of Mexican Pacific harbor seal colonies using carbon and nitrogen stable isotopes |
title_full_unstemmed |
Trophic ecology of Mexican Pacific harbor seal colonies using carbon and nitrogen stable isotopes |
title_sort |
trophic ecology of mexican pacific harbor seal colonies using carbon and nitrogen stable isotopes |
publisher |
Public Library of Science |
publishDate |
2020 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6975529/ http://www.ncbi.nlm.nih.gov/pubmed/31967988 https://doi.org/10.1371/journal.pone.0225889 |
geographic |
Baja Pacific |
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Baja Pacific |
genre |
harbor seal Phoca vitulina |
genre_facet |
harbor seal Phoca vitulina |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6975529/ http://www.ncbi.nlm.nih.gov/pubmed/31967988 http://dx.doi.org/10.1371/journal.pone.0225889 |
op_rights |
© 2020 Juárez-Rodríguez et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. |
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CC-BY |
op_doi |
https://doi.org/10.1371/journal.pone.0225889 |
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e0225889 |
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