0 1996, by the American Society of Limnology and Oceanography, Inc. Global warming impacts on lake trout in arctic lakes
Arctic freshwater ecosystems may be sensitive indicators of climatic warming trends because they have relatively few species and simple food webs. Many of these systems are dominated by lake trout, which act as keystone predators. For arctic Alaska Toolik Lake, we have a 16-yr record of physical, ch...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.583.7819 2023-05-15T14:43:53+02:00 0 1996, by the American Society of Limnology and Oceanography, Inc. Global warming impacts on lake trout in arctic lakes Michael E. Mcdonald Anne E. Hershey Michael C. Miller The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.583.7819 http://www.aslo.org/lo/toc/vol_41/issue_5/1102.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.583.7819 http://www.aslo.org/lo/toc/vol_41/issue_5/1102.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.aslo.org/lo/toc/vol_41/issue_5/1102.pdf text ftciteseerx 2016-08-28T00:05:29Z Arctic freshwater ecosystems may be sensitive indicators of climatic warming trends because they have relatively few species and simple food webs. Many of these systems are dominated by lake trout, which act as keystone predators. For arctic Alaska Toolik Lake, we have a 16-yr record of physical, chemical, and biological data. Our temperature data show a 3°C increase in mean July epilimnetic temperatures. An individual-based bioenergetics model for young-of-year (YOY) lake trout in the lake was used to examine the effects of climate warming on growth of YOY lake trout. Our simulation models predicted that with a July temperature increase, YOY lake trout would need to consume> 8-fold more food (> lo-fold with seasonally increased temperatures) to achieve the same end-of-year size as historically surviving YOY lake trout. We have observed no increase in food availability in the lake, and recent analysis shows that primary productivity has actually decreased. If recent changes in the lake foreshadow a long-term trend, our model results suggest that YOY lake trout will not survive their first winter. Such changes, coupled with other current anthropogenic impacts in the arctic, may disrupt lake trout control of the trophic structure in arctic lakes. Recent models have predicted that accumulating green- Text Arctic Global warming Alaska Unknown Arctic |
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ftciteseerx |
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English |
description |
Arctic freshwater ecosystems may be sensitive indicators of climatic warming trends because they have relatively few species and simple food webs. Many of these systems are dominated by lake trout, which act as keystone predators. For arctic Alaska Toolik Lake, we have a 16-yr record of physical, chemical, and biological data. Our temperature data show a 3°C increase in mean July epilimnetic temperatures. An individual-based bioenergetics model for young-of-year (YOY) lake trout in the lake was used to examine the effects of climate warming on growth of YOY lake trout. Our simulation models predicted that with a July temperature increase, YOY lake trout would need to consume> 8-fold more food (> lo-fold with seasonally increased temperatures) to achieve the same end-of-year size as historically surviving YOY lake trout. We have observed no increase in food availability in the lake, and recent analysis shows that primary productivity has actually decreased. If recent changes in the lake foreshadow a long-term trend, our model results suggest that YOY lake trout will not survive their first winter. Such changes, coupled with other current anthropogenic impacts in the arctic, may disrupt lake trout control of the trophic structure in arctic lakes. Recent models have predicted that accumulating green- |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Michael E. Mcdonald Anne E. Hershey Michael C. Miller |
spellingShingle |
Michael E. Mcdonald Anne E. Hershey Michael C. Miller 0 1996, by the American Society of Limnology and Oceanography, Inc. Global warming impacts on lake trout in arctic lakes |
author_facet |
Michael E. Mcdonald Anne E. Hershey Michael C. Miller |
author_sort |
Michael E. Mcdonald |
title |
0 1996, by the American Society of Limnology and Oceanography, Inc. Global warming impacts on lake trout in arctic lakes |
title_short |
0 1996, by the American Society of Limnology and Oceanography, Inc. Global warming impacts on lake trout in arctic lakes |
title_full |
0 1996, by the American Society of Limnology and Oceanography, Inc. Global warming impacts on lake trout in arctic lakes |
title_fullStr |
0 1996, by the American Society of Limnology and Oceanography, Inc. Global warming impacts on lake trout in arctic lakes |
title_full_unstemmed |
0 1996, by the American Society of Limnology and Oceanography, Inc. Global warming impacts on lake trout in arctic lakes |
title_sort |
0 1996, by the american society of limnology and oceanography, inc. global warming impacts on lake trout in arctic lakes |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.583.7819 http://www.aslo.org/lo/toc/vol_41/issue_5/1102.pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
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Arctic Global warming Alaska |
genre_facet |
Arctic Global warming Alaska |
op_source |
http://www.aslo.org/lo/toc/vol_41/issue_5/1102.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.583.7819 http://www.aslo.org/lo/toc/vol_41/issue_5/1102.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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