Fall diets of alewife, rainbow smelt, and slimy sculpin in the profundal zone of southern Lake Ontario during 1994–2005 with an emphasis on occurrence of Mysis relicta
In Lake Ontario, factors including the collapse of the burrowing amphipod, Diporeia spp., changes in the distribution and composition of the prey fish community, and occurrence of exotic cladocerans Bythotrephes longimanus and Cercopagis pengoi have led to changes in predation pressure on the remain...
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Michigan State University Press
2008
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Online Access: | http://dx.doi.org/10.1080/14634980802516128 https://scholarlypublishingcollective.org/msup/aehm/article-pdf/11/4/368/1446919/368walsh.pdf |
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crmichiganstupr:10.1080/14634980802516128 2024-09-15T18:02:58+00:00 Fall diets of alewife, rainbow smelt, and slimy sculpin in the profundal zone of southern Lake Ontario during 1994–2005 with an emphasis on occurrence of Mysis relicta Walsh, Maureen G. O'Gorman, Robert Strang, Theodore Edwards, William H. Rudstam, Lars G. 2008 http://dx.doi.org/10.1080/14634980802516128 https://scholarlypublishingcollective.org/msup/aehm/article-pdf/11/4/368/1446919/368walsh.pdf en eng Michigan State University Press Aquatic Ecosystem Health & Management volume 11, issue 4, page 368-376 ISSN 1463-4988 1539-4077 journal-article 2008 crmichiganstupr https://doi.org/10.1080/14634980802516128 2024-07-18T04:19:16Z In Lake Ontario, factors including the collapse of the burrowing amphipod, Diporeia spp., changes in the distribution and composition of the prey fish community, and occurrence of exotic cladocerans Bythotrephes longimanus and Cercopagis pengoi have led to changes in predation pressure on the remaining native profundal macroinvertebrate, Mysis relicta. We conducted a diet study on three important prey fishes, alewife (Alosa pseudoharengus), rainbow smelt (Osmerus mordax), and slimy sculpin (Cottus cognatus) in 2002–2005 at depths 75–130 m along the south shore of Lake Ontario to evaluate the current role of Mysis in the diets of these species relative to earlier studies and previously unpublished data from 1994–1995. Mysis have remained an important prey item for alewife, rainbow smelt, and slimy sculpin in the profundal zone of southern Lake Ontario through 2005, indicating that the population has been able to sustain itself following the collapse of Diporeia. Although the occurrence of Diporeia in prey fish diets was minimal in 2003–2005, Bythotrephes longimanus and Cercopagis pengoi played an important role in the diet of alewife and a minor role in the diet of rainbow smelt, and may actually serve to mitigate predation pressure on Mysis, particularly in years when they are very abundant. Conversely, without Diporeia, the benthic slimy sculpin was primarily reliant on Mysis as a prey item and would be most vulnerable to a decline in the Mysis population. Article in Journal/Newspaper Cottus cognatus Slimy sculpin Michigan State University Press Aquatic Ecosystem Health & Management 11 4 368 376 |
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Open Polar |
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Michigan State University Press |
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crmichiganstupr |
language |
English |
description |
In Lake Ontario, factors including the collapse of the burrowing amphipod, Diporeia spp., changes in the distribution and composition of the prey fish community, and occurrence of exotic cladocerans Bythotrephes longimanus and Cercopagis pengoi have led to changes in predation pressure on the remaining native profundal macroinvertebrate, Mysis relicta. We conducted a diet study on three important prey fishes, alewife (Alosa pseudoharengus), rainbow smelt (Osmerus mordax), and slimy sculpin (Cottus cognatus) in 2002–2005 at depths 75–130 m along the south shore of Lake Ontario to evaluate the current role of Mysis in the diets of these species relative to earlier studies and previously unpublished data from 1994–1995. Mysis have remained an important prey item for alewife, rainbow smelt, and slimy sculpin in the profundal zone of southern Lake Ontario through 2005, indicating that the population has been able to sustain itself following the collapse of Diporeia. Although the occurrence of Diporeia in prey fish diets was minimal in 2003–2005, Bythotrephes longimanus and Cercopagis pengoi played an important role in the diet of alewife and a minor role in the diet of rainbow smelt, and may actually serve to mitigate predation pressure on Mysis, particularly in years when they are very abundant. Conversely, without Diporeia, the benthic slimy sculpin was primarily reliant on Mysis as a prey item and would be most vulnerable to a decline in the Mysis population. |
format |
Article in Journal/Newspaper |
author |
Walsh, Maureen G. O'Gorman, Robert Strang, Theodore Edwards, William H. Rudstam, Lars G. |
spellingShingle |
Walsh, Maureen G. O'Gorman, Robert Strang, Theodore Edwards, William H. Rudstam, Lars G. Fall diets of alewife, rainbow smelt, and slimy sculpin in the profundal zone of southern Lake Ontario during 1994–2005 with an emphasis on occurrence of Mysis relicta |
author_facet |
Walsh, Maureen G. O'Gorman, Robert Strang, Theodore Edwards, William H. Rudstam, Lars G. |
author_sort |
Walsh, Maureen G. |
title |
Fall diets of alewife, rainbow smelt, and slimy sculpin in the profundal zone of southern Lake Ontario during 1994–2005 with an emphasis on occurrence of Mysis relicta |
title_short |
Fall diets of alewife, rainbow smelt, and slimy sculpin in the profundal zone of southern Lake Ontario during 1994–2005 with an emphasis on occurrence of Mysis relicta |
title_full |
Fall diets of alewife, rainbow smelt, and slimy sculpin in the profundal zone of southern Lake Ontario during 1994–2005 with an emphasis on occurrence of Mysis relicta |
title_fullStr |
Fall diets of alewife, rainbow smelt, and slimy sculpin in the profundal zone of southern Lake Ontario during 1994–2005 with an emphasis on occurrence of Mysis relicta |
title_full_unstemmed |
Fall diets of alewife, rainbow smelt, and slimy sculpin in the profundal zone of southern Lake Ontario during 1994–2005 with an emphasis on occurrence of Mysis relicta |
title_sort |
fall diets of alewife, rainbow smelt, and slimy sculpin in the profundal zone of southern lake ontario during 1994–2005 with an emphasis on occurrence of mysis relicta |
publisher |
Michigan State University Press |
publishDate |
2008 |
url |
http://dx.doi.org/10.1080/14634980802516128 https://scholarlypublishingcollective.org/msup/aehm/article-pdf/11/4/368/1446919/368walsh.pdf |
genre |
Cottus cognatus Slimy sculpin |
genre_facet |
Cottus cognatus Slimy sculpin |
op_source |
Aquatic Ecosystem Health & Management volume 11, issue 4, page 368-376 ISSN 1463-4988 1539-4077 |
op_doi |
https://doi.org/10.1080/14634980802516128 |
container_title |
Aquatic Ecosystem Health & Management |
container_volume |
11 |
container_issue |
4 |
container_start_page |
368 |
op_container_end_page |
376 |
_version_ |
1810440505003081728 |