A comparison of the functional ecology of visual vs. nonvisual foraging in two planktivorous marine fishes
Some visually foraging planktivorous fish will facultatively engage in nonvisual foraging when opportunities arise or necessity dictates. Yet, little is known about the ecology of nonvisual foraging. We examined the roles of prey size, fish size, and prey density on the nonvisual foraging of walleye...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Online Access: | http://dx.doi.org/10.1139/f02-097 http://www.nrcresearchpress.com/doi/pdf/10.1139/f02-097 |
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crcansciencepubl:10.1139/f02-097 2023-12-17T10:51:04+01:00 A comparison of the functional ecology of visual vs. nonvisual foraging in two planktivorous marine fishes Ryer, Clifford H Lawton, Angela Lopez, Ricardo J Olla, Bori L 2002 http://dx.doi.org/10.1139/f02-097 http://www.nrcresearchpress.com/doi/pdf/10.1139/f02-097 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 59, issue 8, page 1305-1314 ISSN 0706-652X 1205-7533 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 2002 crcansciencepubl https://doi.org/10.1139/f02-097 2023-11-19T13:38:51Z Some visually foraging planktivorous fish will facultatively engage in nonvisual foraging when opportunities arise or necessity dictates. Yet, little is known about the ecology of nonvisual foraging. We examined the roles of prey size, fish size, and prey density on the nonvisual foraging of walleye pollock, Theragra chalcogramma (40100 mm total length), and sablefish, Anoplopoma fimbria (6689 mm), in the laboratory. Both species were size selective, disproportionately consuming large prey just as they do during visual foraging. Large prey were encountered more often, presumably because they were more easily detected by the fish's lateral-line system. When foraging visually, larger fish consumed more prey, but during nonvisual foraging, there was no foraging advantage to greater fish size. Unlike visual detection distances, lateral-line detection distances may not increase appreciably with fish size. Lastly, prey density influenced nonvisual prey consumption. Walleye pollock were characterized by a type I functional response, whereas sablefish were characterized by a type II functional response. Models of planktivore foraging typically assume negligible foraging by particulate feeders below their visual foraging thresholds. On the basis of this study and field data, we suggest that foraging models for particulate feeders, such as juvenile walleye pollock and sablefish, should account for nonvisual size-selective foraging. Article in Journal/Newspaper Theragra chalcogramma Canadian Science Publishing (via Crossref) Canadian Journal of Fisheries and Aquatic Sciences 59 8 1305 1314 |
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Open Polar |
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Canadian Science Publishing (via Crossref) |
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crcansciencepubl |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
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Aquatic Science Ecology, Evolution, Behavior and Systematics Ryer, Clifford H Lawton, Angela Lopez, Ricardo J Olla, Bori L A comparison of the functional ecology of visual vs. nonvisual foraging in two planktivorous marine fishes |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
Some visually foraging planktivorous fish will facultatively engage in nonvisual foraging when opportunities arise or necessity dictates. Yet, little is known about the ecology of nonvisual foraging. We examined the roles of prey size, fish size, and prey density on the nonvisual foraging of walleye pollock, Theragra chalcogramma (40100 mm total length), and sablefish, Anoplopoma fimbria (6689 mm), in the laboratory. Both species were size selective, disproportionately consuming large prey just as they do during visual foraging. Large prey were encountered more often, presumably because they were more easily detected by the fish's lateral-line system. When foraging visually, larger fish consumed more prey, but during nonvisual foraging, there was no foraging advantage to greater fish size. Unlike visual detection distances, lateral-line detection distances may not increase appreciably with fish size. Lastly, prey density influenced nonvisual prey consumption. Walleye pollock were characterized by a type I functional response, whereas sablefish were characterized by a type II functional response. Models of planktivore foraging typically assume negligible foraging by particulate feeders below their visual foraging thresholds. On the basis of this study and field data, we suggest that foraging models for particulate feeders, such as juvenile walleye pollock and sablefish, should account for nonvisual size-selective foraging. |
format |
Article in Journal/Newspaper |
author |
Ryer, Clifford H Lawton, Angela Lopez, Ricardo J Olla, Bori L |
author_facet |
Ryer, Clifford H Lawton, Angela Lopez, Ricardo J Olla, Bori L |
author_sort |
Ryer, Clifford H |
title |
A comparison of the functional ecology of visual vs. nonvisual foraging in two planktivorous marine fishes |
title_short |
A comparison of the functional ecology of visual vs. nonvisual foraging in two planktivorous marine fishes |
title_full |
A comparison of the functional ecology of visual vs. nonvisual foraging in two planktivorous marine fishes |
title_fullStr |
A comparison of the functional ecology of visual vs. nonvisual foraging in two planktivorous marine fishes |
title_full_unstemmed |
A comparison of the functional ecology of visual vs. nonvisual foraging in two planktivorous marine fishes |
title_sort |
comparison of the functional ecology of visual vs. nonvisual foraging in two planktivorous marine fishes |
publisher |
Canadian Science Publishing |
publishDate |
2002 |
url |
http://dx.doi.org/10.1139/f02-097 http://www.nrcresearchpress.com/doi/pdf/10.1139/f02-097 |
genre |
Theragra chalcogramma |
genre_facet |
Theragra chalcogramma |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 59, issue 8, page 1305-1314 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f02-097 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
59 |
container_issue |
8 |
container_start_page |
1305 |
op_container_end_page |
1314 |
_version_ |
1785576218071924736 |