Stable carbon and nitrogen isotopes in multiple tissues of wild and captive harbor seals ( Phoca vitulina ) off the California coast
Abstract Stable carbon and nitrogen isotope ratios (δ 13 C and δ 15 N) of serum, red blood cells (RBC), muscle, and blubber were measured in captive and wild northeast Pacific harbor seals ( Phoca vitulina richardii ) at three coastal California sites (San Francisco Bay, Tomales Bay, and Channel Isl...
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crwiley:10.1111/j.1748-7692.2011.00516.x 2023-12-03T10:29:05+01:00 Stable carbon and nitrogen isotopes in multiple tissues of wild and captive harbor seals ( Phoca vitulina ) off the California coast Germain, Leslie R. McCarthy, Matthew D. Koch, Paul L. Harvey, James T. 2011 http://dx.doi.org/10.1111/j.1748-7692.2011.00516.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1748-7692.2011.00516.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1748-7692.2011.00516.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Marine Mammal Science volume 28, issue 3, page 542-560 ISSN 0824-0469 1748-7692 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 2011 crwiley https://doi.org/10.1111/j.1748-7692.2011.00516.x 2023-11-09T14:10:09Z Abstract Stable carbon and nitrogen isotope ratios (δ 13 C and δ 15 N) of serum, red blood cells (RBC), muscle, and blubber were measured in captive and wild northeast Pacific harbor seals ( Phoca vitulina richardii ) at three coastal California sites (San Francisco Bay, Tomales Bay, and Channel Islands). Trophic discrimination factors (Δ Tissue‐Diet ) were calculated for captive seals and then applied in wild counterparts in each habitat to estimate trophic position and feeding behavior. Trophic discrimination factors for δ 15 N of serum (+3.8‰), lipid‐extracted muscle (+1.6‰), and lipid‐blubber (+6.5‰) are proposed to determine trophic position. An offset between RBC and serum of +0.3‰ for δ 13 C and −0.6‰ for δ 15 N was observed, which is consistent with previous research. Specifically, weaner seals (<1 yr) had large offsets, suggesting strong trophic position shifts during this life stage. Isotopic values indicated an average trophic position of 3.6 at both San Francisco Bay and Tomales Bay and 4.2 at Channel Islands. Isotopic means were strongly dependent on age class and also suggested that mean diet composition varies considerably between all locations. Together, these data indicate that isotopic composition of blood fractions can be an effective approach to estimate trophic position and dietary behavior in wild pinnipeds. Article in Journal/Newspaper Phoca vitulina Wiley Online Library (via Crossref) Pacific Marine Mammal Science 28 3 542 560 |
institution |
Open Polar |
collection |
Wiley Online Library (via Crossref) |
op_collection_id |
crwiley |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Aquatic Science Ecology, Evolution, Behavior and Systematics Germain, Leslie R. McCarthy, Matthew D. Koch, Paul L. Harvey, James T. Stable carbon and nitrogen isotopes in multiple tissues of wild and captive harbor seals ( Phoca vitulina ) off the California coast |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
Abstract Stable carbon and nitrogen isotope ratios (δ 13 C and δ 15 N) of serum, red blood cells (RBC), muscle, and blubber were measured in captive and wild northeast Pacific harbor seals ( Phoca vitulina richardii ) at three coastal California sites (San Francisco Bay, Tomales Bay, and Channel Islands). Trophic discrimination factors (Δ Tissue‐Diet ) were calculated for captive seals and then applied in wild counterparts in each habitat to estimate trophic position and feeding behavior. Trophic discrimination factors for δ 15 N of serum (+3.8‰), lipid‐extracted muscle (+1.6‰), and lipid‐blubber (+6.5‰) are proposed to determine trophic position. An offset between RBC and serum of +0.3‰ for δ 13 C and −0.6‰ for δ 15 N was observed, which is consistent with previous research. Specifically, weaner seals (<1 yr) had large offsets, suggesting strong trophic position shifts during this life stage. Isotopic values indicated an average trophic position of 3.6 at both San Francisco Bay and Tomales Bay and 4.2 at Channel Islands. Isotopic means were strongly dependent on age class and also suggested that mean diet composition varies considerably between all locations. Together, these data indicate that isotopic composition of blood fractions can be an effective approach to estimate trophic position and dietary behavior in wild pinnipeds. |
format |
Article in Journal/Newspaper |
author |
Germain, Leslie R. McCarthy, Matthew D. Koch, Paul L. Harvey, James T. |
author_facet |
Germain, Leslie R. McCarthy, Matthew D. Koch, Paul L. Harvey, James T. |
author_sort |
Germain, Leslie R. |
title |
Stable carbon and nitrogen isotopes in multiple tissues of wild and captive harbor seals ( Phoca vitulina ) off the California coast |
title_short |
Stable carbon and nitrogen isotopes in multiple tissues of wild and captive harbor seals ( Phoca vitulina ) off the California coast |
title_full |
Stable carbon and nitrogen isotopes in multiple tissues of wild and captive harbor seals ( Phoca vitulina ) off the California coast |
title_fullStr |
Stable carbon and nitrogen isotopes in multiple tissues of wild and captive harbor seals ( Phoca vitulina ) off the California coast |
title_full_unstemmed |
Stable carbon and nitrogen isotopes in multiple tissues of wild and captive harbor seals ( Phoca vitulina ) off the California coast |
title_sort |
stable carbon and nitrogen isotopes in multiple tissues of wild and captive harbor seals ( phoca vitulina ) off the california coast |
publisher |
Wiley |
publishDate |
2011 |
url |
http://dx.doi.org/10.1111/j.1748-7692.2011.00516.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1748-7692.2011.00516.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1748-7692.2011.00516.x |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Phoca vitulina |
genre_facet |
Phoca vitulina |
op_source |
Marine Mammal Science volume 28, issue 3, page 542-560 ISSN 0824-0469 1748-7692 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1748-7692.2011.00516.x |
container_title |
Marine Mammal Science |
container_volume |
28 |
container_issue |
3 |
container_start_page |
542 |
op_container_end_page |
560 |
_version_ |
1784254220682133504 |