Factors influencing diet and prey selection of the sculpin Cottus cognatus and Myoxocephalus thompsonii .
Selective feeding by fish can have profound impacts on prey community structure and food web dynamics in aquatic ecosystems, but few studies have examined prey selection in benthic fishes. In this study, diet and prey selection dynamics were analyzed for two benthic fish from Lake Michigan, slimy sc...
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ftumdeepblue:oai:deepblue.lib.umich.edu:2027.42/126052 2024-01-07T09:42:44+01:00 Factors influencing diet and prey selection of the sculpin Cottus cognatus and Myoxocephalus thompsonii . Hondorp, Darryl W. Brandt, Stephen B. Rutherford, Edward S. 2006 162 p. application/pdf https://hdl.handle.net/2027.42/126052 http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqm&rft_dat=xri:pqdiss:3224904 English EN eng http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqm&rft_dat=xri:pqdiss:3224904 https://hdl.handle.net/2027.42/126052 Benthic Fish Cottus Cognatus Diet Diporeia Factors Foraging Influencing Myoxocephalus Thompsonii Mysis Prey Sculpin Selection Thesis 2006 ftumdeepblue 2023-12-10T17:49:50Z Selective feeding by fish can have profound impacts on prey community structure and food web dynamics in aquatic ecosystems, but few studies have examined prey selection in benthic fishes. In this study, diet and prey selection dynamics were analyzed for two benthic fish from Lake Michigan, slimy sculpin Cottus cognatus and deepwater sculpin Myoxocephalus thompsonii (Family Cottidae). The benthic amphipod Diporeia was an important prey for both sculpin, but relative frequencies of other prey in sculpin diets differed between species. For example, Mysis relicta was significantly more common in the diet of deepwater sculpin, whereas chironomids (Order: Diptera; Family: Chironomidae) were more important prey for slimy sculpin. These patterns suggested differences in prey selection between the two sculpin species. This was confirmed by a field-based study of sculpin prey selection, which showed that chironomids and Diporeia were preferentially consumed by slimy sculpin, whereas Mysis was preferentially consumed only by deepwater sculpin. Variation in prey-species selection within and between sculpin species was associated with differential prey capture and encounter rates. For example, due to differences in prey evasiveness, prey capture success by sculpin in laboratory feeding trials was greatest for chironomids, lowest for Mysis, and intermediate for Diporeia. This pattern was consistent with trends in slimy sculpin prey-species selection observed in the field. Similarly, greater occurrence of Mysis in deepwater sculpin diets was partly attributable to higher capture success with mysid prey. Encounter rates with Mysis also may be higher for deepwater sculpin than for slimy sculpin due to the former's larger reactive volume. The larger reactive volume of deepwater sculpin may give it a competitive advantage over slimy sculpin in areas of sympatry, a hypothesis supported by the relative scarcity of slimy sculpin at depths where deepwater sculpin are abundant. This study also showed that sculpin are size-selective ... Thesis Cottus cognatus Slimy sculpin University of Michigan: Deep Blue |
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Open Polar |
collection |
University of Michigan: Deep Blue |
op_collection_id |
ftumdeepblue |
language |
English |
topic |
Benthic Fish Cottus Cognatus Diet Diporeia Factors Foraging Influencing Myoxocephalus Thompsonii Mysis Prey Sculpin Selection |
spellingShingle |
Benthic Fish Cottus Cognatus Diet Diporeia Factors Foraging Influencing Myoxocephalus Thompsonii Mysis Prey Sculpin Selection Hondorp, Darryl W. Factors influencing diet and prey selection of the sculpin Cottus cognatus and Myoxocephalus thompsonii . |
topic_facet |
Benthic Fish Cottus Cognatus Diet Diporeia Factors Foraging Influencing Myoxocephalus Thompsonii Mysis Prey Sculpin Selection |
description |
Selective feeding by fish can have profound impacts on prey community structure and food web dynamics in aquatic ecosystems, but few studies have examined prey selection in benthic fishes. In this study, diet and prey selection dynamics were analyzed for two benthic fish from Lake Michigan, slimy sculpin Cottus cognatus and deepwater sculpin Myoxocephalus thompsonii (Family Cottidae). The benthic amphipod Diporeia was an important prey for both sculpin, but relative frequencies of other prey in sculpin diets differed between species. For example, Mysis relicta was significantly more common in the diet of deepwater sculpin, whereas chironomids (Order: Diptera; Family: Chironomidae) were more important prey for slimy sculpin. These patterns suggested differences in prey selection between the two sculpin species. This was confirmed by a field-based study of sculpin prey selection, which showed that chironomids and Diporeia were preferentially consumed by slimy sculpin, whereas Mysis was preferentially consumed only by deepwater sculpin. Variation in prey-species selection within and between sculpin species was associated with differential prey capture and encounter rates. For example, due to differences in prey evasiveness, prey capture success by sculpin in laboratory feeding trials was greatest for chironomids, lowest for Mysis, and intermediate for Diporeia. This pattern was consistent with trends in slimy sculpin prey-species selection observed in the field. Similarly, greater occurrence of Mysis in deepwater sculpin diets was partly attributable to higher capture success with mysid prey. Encounter rates with Mysis also may be higher for deepwater sculpin than for slimy sculpin due to the former's larger reactive volume. The larger reactive volume of deepwater sculpin may give it a competitive advantage over slimy sculpin in areas of sympatry, a hypothesis supported by the relative scarcity of slimy sculpin at depths where deepwater sculpin are abundant. This study also showed that sculpin are size-selective ... |
author2 |
Brandt, Stephen B. Rutherford, Edward S. |
format |
Thesis |
author |
Hondorp, Darryl W. |
author_facet |
Hondorp, Darryl W. |
author_sort |
Hondorp, Darryl W. |
title |
Factors influencing diet and prey selection of the sculpin Cottus cognatus and Myoxocephalus thompsonii . |
title_short |
Factors influencing diet and prey selection of the sculpin Cottus cognatus and Myoxocephalus thompsonii . |
title_full |
Factors influencing diet and prey selection of the sculpin Cottus cognatus and Myoxocephalus thompsonii . |
title_fullStr |
Factors influencing diet and prey selection of the sculpin Cottus cognatus and Myoxocephalus thompsonii . |
title_full_unstemmed |
Factors influencing diet and prey selection of the sculpin Cottus cognatus and Myoxocephalus thompsonii . |
title_sort |
factors influencing diet and prey selection of the sculpin cottus cognatus and myoxocephalus thompsonii . |
publishDate |
2006 |
url |
https://hdl.handle.net/2027.42/126052 http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqm&rft_dat=xri:pqdiss:3224904 |
genre |
Cottus cognatus Slimy sculpin |
genre_facet |
Cottus cognatus Slimy sculpin |
op_relation |
http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqm&rft_dat=xri:pqdiss:3224904 https://hdl.handle.net/2027.42/126052 |
_version_ |
1787423779939418112 |