Position Choice by Drift-Feeding Salmonids: Model and Test for Arctic Grayling ( Thymallus arcticus) in Subarctic Mountain Streams, Interior Alaska
We develop a model to predict position choice of drift-feeding stream salmonids, assuming a fish chooses the position that maximizes its net energy intake rate. The fish's habitat is represented as a series of stream cross-profiles, each divided into vertical strips characterized by water depth...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Language: | English |
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Canadian Science Publishing
1990
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Online Access: | http://dx.doi.org/10.1139/f90-228 http://www.nrcresearchpress.com/doi/pdf/10.1139/f90-228 |
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crcansciencepubl:10.1139/f90-228 2024-09-30T14:28:31+00:00 Position Choice by Drift-Feeding Salmonids: Model and Test for Arctic Grayling ( Thymallus arcticus) in Subarctic Mountain Streams, Interior Alaska Hughes, Nicholas F. Dill, Lawrence M. 1990 http://dx.doi.org/10.1139/f90-228 http://www.nrcresearchpress.com/doi/pdf/10.1139/f90-228 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 47, issue 10, page 2039-2048 ISSN 0706-652X 1205-7533 journal-article 1990 crcansciencepubl https://doi.org/10.1139/f90-228 2024-09-19T04:09:47Z We develop a model to predict position choice of drift-feeding stream salmonids, assuming a fish chooses the position that maximizes its net energy intake rate. The fish's habitat is represented as a series of stream cross-profiles, each divided into vertical strips characterized by water depth and velocity. The fish may select a focal point in any of these strips, and include several neighbouring strips in its foraging area. The number of prey the fish encounters depends on its reaction distance to prey, water depth, and water velocity; the proportion of detected prey the fish is able to capture declines with water velocity. The fish's net energy intake rate is its gross energy intake rate from feeding minus the swimming cost calculated by using water velocity at the fish's focal point. There was a close match between the positions predicted by this model and those chosen by solitary Arctic grayling (Thymallus arcticus) in the pools of a mountain stream in Alaska. Article in Journal/Newspaper Arctic grayling Arctic Subarctic Thymallus arcticus Alaska Canadian Science Publishing Arctic Canadian Journal of Fisheries and Aquatic Sciences 47 10 2039 2048 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
We develop a model to predict position choice of drift-feeding stream salmonids, assuming a fish chooses the position that maximizes its net energy intake rate. The fish's habitat is represented as a series of stream cross-profiles, each divided into vertical strips characterized by water depth and velocity. The fish may select a focal point in any of these strips, and include several neighbouring strips in its foraging area. The number of prey the fish encounters depends on its reaction distance to prey, water depth, and water velocity; the proportion of detected prey the fish is able to capture declines with water velocity. The fish's net energy intake rate is its gross energy intake rate from feeding minus the swimming cost calculated by using water velocity at the fish's focal point. There was a close match between the positions predicted by this model and those chosen by solitary Arctic grayling (Thymallus arcticus) in the pools of a mountain stream in Alaska. |
format |
Article in Journal/Newspaper |
author |
Hughes, Nicholas F. Dill, Lawrence M. |
spellingShingle |
Hughes, Nicholas F. Dill, Lawrence M. Position Choice by Drift-Feeding Salmonids: Model and Test for Arctic Grayling ( Thymallus arcticus) in Subarctic Mountain Streams, Interior Alaska |
author_facet |
Hughes, Nicholas F. Dill, Lawrence M. |
author_sort |
Hughes, Nicholas F. |
title |
Position Choice by Drift-Feeding Salmonids: Model and Test for Arctic Grayling ( Thymallus arcticus) in Subarctic Mountain Streams, Interior Alaska |
title_short |
Position Choice by Drift-Feeding Salmonids: Model and Test for Arctic Grayling ( Thymallus arcticus) in Subarctic Mountain Streams, Interior Alaska |
title_full |
Position Choice by Drift-Feeding Salmonids: Model and Test for Arctic Grayling ( Thymallus arcticus) in Subarctic Mountain Streams, Interior Alaska |
title_fullStr |
Position Choice by Drift-Feeding Salmonids: Model and Test for Arctic Grayling ( Thymallus arcticus) in Subarctic Mountain Streams, Interior Alaska |
title_full_unstemmed |
Position Choice by Drift-Feeding Salmonids: Model and Test for Arctic Grayling ( Thymallus arcticus) in Subarctic Mountain Streams, Interior Alaska |
title_sort |
position choice by drift-feeding salmonids: model and test for arctic grayling ( thymallus arcticus) in subarctic mountain streams, interior alaska |
publisher |
Canadian Science Publishing |
publishDate |
1990 |
url |
http://dx.doi.org/10.1139/f90-228 http://www.nrcresearchpress.com/doi/pdf/10.1139/f90-228 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic grayling Arctic Subarctic Thymallus arcticus Alaska |
genre_facet |
Arctic grayling Arctic Subarctic Thymallus arcticus Alaska |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 47, issue 10, page 2039-2048 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f90-228 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
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47 |
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10 |
container_start_page |
2039 |
op_container_end_page |
2048 |
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1811634157715980288 |