Diet and Digestion Rates of Slimy Sculpin, Cottus cognatus , in an Alaskan Arctic Lake
In arctic Toolik Lake, slimy sculpin (Cottus cognatus) rely on a diet of larval chironomids (Diptera: Chironomidae). Dry weight of sculpin gut contents was not correlated with fish wet weight. This finding, combined with age and growth data, suggested that sculpin may be food limited in Toolik Lake,...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Language: | English |
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Canadian Science Publishing
1985
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Online Access: | http://dx.doi.org/10.1139/f85-065 http://www.nrcresearchpress.com/doi/pdf/10.1139/f85-065 |
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crcansciencepubl:10.1139/f85-065 2023-12-17T10:25:21+01:00 Diet and Digestion Rates of Slimy Sculpin, Cottus cognatus , in an Alaskan Arctic Lake Hershey, Anne E. McDonald, Michael E. 1985 http://dx.doi.org/10.1139/f85-065 http://www.nrcresearchpress.com/doi/pdf/10.1139/f85-065 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 42, issue 3, page 483-487 ISSN 0706-652X 1205-7533 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 1985 crcansciencepubl https://doi.org/10.1139/f85-065 2023-11-19T13:38:21Z In arctic Toolik Lake, slimy sculpin (Cottus cognatus) rely on a diet of larval chironomids (Diptera: Chironomidae). Dry weight of sculpin gut contents was not correlated with fish wet weight. This finding, combined with age and growth data, suggested that sculpin may be food limited in Toolik Lake, particularly as they approach reproductive size. Since three taxonomically distinct chironomids were digested at similar rates, one chironomid species was used as a marker to measure gut passage. Gut passage rate as a function of temperature fits an inverse quadratic model slightly better than a negative exponential model. Sculpins took approximately 1 d to digest food at typical summer temperatures (8–16 °C), but approximately 2 d at a typical winter temperature (4 °C). Since winter is three times longer than summer, winter feeding by sculpins may have greater impact on chironomid density than summer feeding. If sculpin are important in the diet of other Toolik Lake fishes, they may serve as an important trophic link between benthic and pelagic production. Article in Journal/Newspaper Arctic Cottus cognatus Slimy sculpin Canadian Science Publishing (via Crossref) Arctic Arctic Lake ENVELOPE(-130.826,-130.826,57.231,57.231) Canadian Journal of Fisheries and Aquatic Sciences 42 3 483 487 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Aquatic Science Ecology, Evolution, Behavior and Systematics Hershey, Anne E. McDonald, Michael E. Diet and Digestion Rates of Slimy Sculpin, Cottus cognatus , in an Alaskan Arctic Lake |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
In arctic Toolik Lake, slimy sculpin (Cottus cognatus) rely on a diet of larval chironomids (Diptera: Chironomidae). Dry weight of sculpin gut contents was not correlated with fish wet weight. This finding, combined with age and growth data, suggested that sculpin may be food limited in Toolik Lake, particularly as they approach reproductive size. Since three taxonomically distinct chironomids were digested at similar rates, one chironomid species was used as a marker to measure gut passage. Gut passage rate as a function of temperature fits an inverse quadratic model slightly better than a negative exponential model. Sculpins took approximately 1 d to digest food at typical summer temperatures (8–16 °C), but approximately 2 d at a typical winter temperature (4 °C). Since winter is three times longer than summer, winter feeding by sculpins may have greater impact on chironomid density than summer feeding. If sculpin are important in the diet of other Toolik Lake fishes, they may serve as an important trophic link between benthic and pelagic production. |
format |
Article in Journal/Newspaper |
author |
Hershey, Anne E. McDonald, Michael E. |
author_facet |
Hershey, Anne E. McDonald, Michael E. |
author_sort |
Hershey, Anne E. |
title |
Diet and Digestion Rates of Slimy Sculpin, Cottus cognatus , in an Alaskan Arctic Lake |
title_short |
Diet and Digestion Rates of Slimy Sculpin, Cottus cognatus , in an Alaskan Arctic Lake |
title_full |
Diet and Digestion Rates of Slimy Sculpin, Cottus cognatus , in an Alaskan Arctic Lake |
title_fullStr |
Diet and Digestion Rates of Slimy Sculpin, Cottus cognatus , in an Alaskan Arctic Lake |
title_full_unstemmed |
Diet and Digestion Rates of Slimy Sculpin, Cottus cognatus , in an Alaskan Arctic Lake |
title_sort |
diet and digestion rates of slimy sculpin, cottus cognatus , in an alaskan arctic lake |
publisher |
Canadian Science Publishing |
publishDate |
1985 |
url |
http://dx.doi.org/10.1139/f85-065 http://www.nrcresearchpress.com/doi/pdf/10.1139/f85-065 |
long_lat |
ENVELOPE(-130.826,-130.826,57.231,57.231) |
geographic |
Arctic Arctic Lake |
geographic_facet |
Arctic Arctic Lake |
genre |
Arctic Cottus cognatus Slimy sculpin |
genre_facet |
Arctic Cottus cognatus Slimy sculpin |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 42, issue 3, page 483-487 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f85-065 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
42 |
container_issue |
3 |
container_start_page |
483 |
op_container_end_page |
487 |
_version_ |
1785575878598590464 |