Diet composition and seasonal feeding patterns of a freshwater ringed seal ( Pusa hispida saimensis )
Abstract The Saimaa ringed seal ( Pusa hispida saimensis ) is one of the few freshwater seal populations worldwide. The major conservation issue of this critically endangered population is bycatch mortality. We used digestive tract content and stable isotopes ( δ 13 C and δ 15 N) to estimate the die...
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crwiley:10.1111/mms.12133 2023-12-03T10:29:23+01:00 Diet composition and seasonal feeding patterns of a freshwater ringed seal ( Pusa hispida saimensis ) Auttila, Miina Sinisalo, Tuula Valtonen, Mia Niemi, Marja Viljanen, Markku Kurkilahti, Mika Kunnasranta, Mervi 2014 http://dx.doi.org/10.1111/mms.12133 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fmms.12133 https://onlinelibrary.wiley.com/doi/pdf/10.1111/mms.12133 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Marine Mammal Science volume 31, issue 1, page 45-65 ISSN 0824-0469 1748-7692 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 2014 crwiley https://doi.org/10.1111/mms.12133 2023-11-09T13:14:26Z Abstract The Saimaa ringed seal ( Pusa hispida saimensis ) is one of the few freshwater seal populations worldwide. The major conservation issue of this critically endangered population is bycatch mortality. We used digestive tract content and stable isotopes ( δ 13 C and δ 15 N) to estimate the diet and seasonal feeding patterns for gaining better understanding of the seals feeding habits and potential conservation implications. The diet was similar across age groups. Altogether 15 fish species were identified and the most important were smelt ( Osmerus eperlanus ), ruff ( Gymnocephalus cernuus ), perch ( Perca fluviatilis ), vendace ( Coregonus albula ) and cyprinids. The high δ 15 N values suggested that the seals lose weight during winter and spring. Additionally the drop in δ 15 N values indicated that pups start to recover from postweaning stress and gain weight around the age of 6 mo. The isotope values differed regionally, which emphasizes that samples from consumers and prey should be collected from the same regions to improve interpretation of the stable isotopic results. Overall, diet composition suggests minimal to nonexistent competition with commercial or recreational fishing. However, observed weight loss of pups during summer may be related to higher risk of bycatch and this should be taken into account when planning temporal fishing closures. Article in Journal/Newspaper Pusa hispida ringed seal Gymnocephalus cernuus Ruff Wiley Online Library (via Crossref) Marine Mammal Science 31 1 45 65 |
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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 Auttila, Miina Sinisalo, Tuula Valtonen, Mia Niemi, Marja Viljanen, Markku Kurkilahti, Mika Kunnasranta, Mervi Diet composition and seasonal feeding patterns of a freshwater ringed seal ( Pusa hispida saimensis ) |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
Abstract The Saimaa ringed seal ( Pusa hispida saimensis ) is one of the few freshwater seal populations worldwide. The major conservation issue of this critically endangered population is bycatch mortality. We used digestive tract content and stable isotopes ( δ 13 C and δ 15 N) to estimate the diet and seasonal feeding patterns for gaining better understanding of the seals feeding habits and potential conservation implications. The diet was similar across age groups. Altogether 15 fish species were identified and the most important were smelt ( Osmerus eperlanus ), ruff ( Gymnocephalus cernuus ), perch ( Perca fluviatilis ), vendace ( Coregonus albula ) and cyprinids. The high δ 15 N values suggested that the seals lose weight during winter and spring. Additionally the drop in δ 15 N values indicated that pups start to recover from postweaning stress and gain weight around the age of 6 mo. The isotope values differed regionally, which emphasizes that samples from consumers and prey should be collected from the same regions to improve interpretation of the stable isotopic results. Overall, diet composition suggests minimal to nonexistent competition with commercial or recreational fishing. However, observed weight loss of pups during summer may be related to higher risk of bycatch and this should be taken into account when planning temporal fishing closures. |
format |
Article in Journal/Newspaper |
author |
Auttila, Miina Sinisalo, Tuula Valtonen, Mia Niemi, Marja Viljanen, Markku Kurkilahti, Mika Kunnasranta, Mervi |
author_facet |
Auttila, Miina Sinisalo, Tuula Valtonen, Mia Niemi, Marja Viljanen, Markku Kurkilahti, Mika Kunnasranta, Mervi |
author_sort |
Auttila, Miina |
title |
Diet composition and seasonal feeding patterns of a freshwater ringed seal ( Pusa hispida saimensis ) |
title_short |
Diet composition and seasonal feeding patterns of a freshwater ringed seal ( Pusa hispida saimensis ) |
title_full |
Diet composition and seasonal feeding patterns of a freshwater ringed seal ( Pusa hispida saimensis ) |
title_fullStr |
Diet composition and seasonal feeding patterns of a freshwater ringed seal ( Pusa hispida saimensis ) |
title_full_unstemmed |
Diet composition and seasonal feeding patterns of a freshwater ringed seal ( Pusa hispida saimensis ) |
title_sort |
diet composition and seasonal feeding patterns of a freshwater ringed seal ( pusa hispida saimensis ) |
publisher |
Wiley |
publishDate |
2014 |
url |
http://dx.doi.org/10.1111/mms.12133 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fmms.12133 https://onlinelibrary.wiley.com/doi/pdf/10.1111/mms.12133 |
genre |
Pusa hispida ringed seal Gymnocephalus cernuus Ruff |
genre_facet |
Pusa hispida ringed seal Gymnocephalus cernuus Ruff |
op_source |
Marine Mammal Science volume 31, issue 1, page 45-65 ISSN 0824-0469 1748-7692 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/mms.12133 |
container_title |
Marine Mammal Science |
container_volume |
31 |
container_issue |
1 |
container_start_page |
45 |
op_container_end_page |
65 |
_version_ |
1784254693370757120 |