The Capelin invasion: evidence for a trophic shift in Arctic Char populations from the Cumberland Sound region, Nunavut, Canada
Climate change is having myriad effects on Arctic marine ecosystems and food webs. Anadromous Arctic Char, Salvelinus alpinus (Linnaeus, 1758), feed intensively at sea during summer. In Cumberland Sound, Nunavut, Canada, there has been a recent increased availability of a forage fish, Capelin. To in...
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crcansciencepubl:10.1139/as-2020-0001 2024-09-15T17:49:57+00:00 The Capelin invasion: evidence for a trophic shift in Arctic Char populations from the Cumberland Sound region, Nunavut, Canada Ulrich, Kendra Lyn Tallman, Ross F. 2021 http://dx.doi.org/10.1139/as-2020-0001 https://cdnsciencepub.com/doi/full-xml/10.1139/as-2020-0001 https://cdnsciencepub.com/doi/pdf/10.1139/as-2020-0001 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Arctic Science volume 7, issue 2, page 413-435 ISSN 2368-7460 2368-7460 journal-article 2021 crcansciencepubl https://doi.org/10.1139/as-2020-0001 2024-08-29T04:08:49Z Climate change is having myriad effects on Arctic marine ecosystems and food webs. Anadromous Arctic Char, Salvelinus alpinus (Linnaeus, 1758), feed intensively at sea during summer. In Cumberland Sound, Nunavut, Canada, there has been a recent increased availability of a forage fish, Capelin. To investigate changes over time in Arctic Char foraging, we assessed Arctic Char trophic niche from 2002 to 2011 using stomach content analysis and stable isotope analysis (δ 13 C and δ 15 N) of muscle tissue from two river/lake systems, Isuituq and Kipisa. We also compared population characteristics by calculating Fulton’s condition factor (K) and by fitting von Bertalanffy growth curves with length-at-age data. Results revealed Capelin were newly present in the diets of Arctic Char in 2011, describing a shift from a primarily invertebrate-based to a fish-based diet. No trend in δ 15 N over time suggests that the trophic level of Arctic Char has not changed; however, the δ 15 C for both systems converged in 2011 on a value suggestive of feeding on Capelin. Growth curves and length-at-age analyses suggest that foraging on Capelin may have increased individual growth. Changes in the growth and condition of Arctic Char in this region could have significant economic and cultural implications. Article in Journal/Newspaper Arctic Climate change Cumberland Sound Nunavut Salvelinus alpinus Canadian Science Publishing Arctic Science 1 23 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
Climate change is having myriad effects on Arctic marine ecosystems and food webs. Anadromous Arctic Char, Salvelinus alpinus (Linnaeus, 1758), feed intensively at sea during summer. In Cumberland Sound, Nunavut, Canada, there has been a recent increased availability of a forage fish, Capelin. To investigate changes over time in Arctic Char foraging, we assessed Arctic Char trophic niche from 2002 to 2011 using stomach content analysis and stable isotope analysis (δ 13 C and δ 15 N) of muscle tissue from two river/lake systems, Isuituq and Kipisa. We also compared population characteristics by calculating Fulton’s condition factor (K) and by fitting von Bertalanffy growth curves with length-at-age data. Results revealed Capelin were newly present in the diets of Arctic Char in 2011, describing a shift from a primarily invertebrate-based to a fish-based diet. No trend in δ 15 N over time suggests that the trophic level of Arctic Char has not changed; however, the δ 15 C for both systems converged in 2011 on a value suggestive of feeding on Capelin. Growth curves and length-at-age analyses suggest that foraging on Capelin may have increased individual growth. Changes in the growth and condition of Arctic Char in this region could have significant economic and cultural implications. |
format |
Article in Journal/Newspaper |
author |
Ulrich, Kendra Lyn Tallman, Ross F. |
spellingShingle |
Ulrich, Kendra Lyn Tallman, Ross F. The Capelin invasion: evidence for a trophic shift in Arctic Char populations from the Cumberland Sound region, Nunavut, Canada |
author_facet |
Ulrich, Kendra Lyn Tallman, Ross F. |
author_sort |
Ulrich, Kendra Lyn |
title |
The Capelin invasion: evidence for a trophic shift in Arctic Char populations from the Cumberland Sound region, Nunavut, Canada |
title_short |
The Capelin invasion: evidence for a trophic shift in Arctic Char populations from the Cumberland Sound region, Nunavut, Canada |
title_full |
The Capelin invasion: evidence for a trophic shift in Arctic Char populations from the Cumberland Sound region, Nunavut, Canada |
title_fullStr |
The Capelin invasion: evidence for a trophic shift in Arctic Char populations from the Cumberland Sound region, Nunavut, Canada |
title_full_unstemmed |
The Capelin invasion: evidence for a trophic shift in Arctic Char populations from the Cumberland Sound region, Nunavut, Canada |
title_sort |
capelin invasion: evidence for a trophic shift in arctic char populations from the cumberland sound region, nunavut, canada |
publisher |
Canadian Science Publishing |
publishDate |
2021 |
url |
http://dx.doi.org/10.1139/as-2020-0001 https://cdnsciencepub.com/doi/full-xml/10.1139/as-2020-0001 https://cdnsciencepub.com/doi/pdf/10.1139/as-2020-0001 |
genre |
Arctic Climate change Cumberland Sound Nunavut Salvelinus alpinus |
genre_facet |
Arctic Climate change Cumberland Sound Nunavut Salvelinus alpinus |
op_source |
Arctic Science volume 7, issue 2, page 413-435 ISSN 2368-7460 2368-7460 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/as-2020-0001 |
container_title |
Arctic Science |
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1 |
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23 |
_version_ |
1810291794942885888 |