The functional response of drift-feeding Arctic grayling: the effects of prey density, water velocity, and location efficiency
An important aspect of a predatorprey system is the functional response of the predator to changing prey densities. We studied the feeding rate response of drift-feeding Arctic grayling (Thymallus arcticus) on a small invertebrate prey, Daphnia middendorffiana, at densities ranging from 0.01 L 1 t...
Published in: | Canadian Journal of Fisheries and Aquatic Sciences |
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Online Access: | http://dx.doi.org/10.1139/f01-138 http://www.nrcresearchpress.com/doi/pdf/10.1139/f01-138 |
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crcansciencepubl:10.1139/f01-138 2024-04-07T07:49:02+00:00 The functional response of drift-feeding Arctic grayling: the effects of prey density, water velocity, and location efficiency O'Brien, W John Barfield, Michael Sigler, Karen 2001 http://dx.doi.org/10.1139/f01-138 http://www.nrcresearchpress.com/doi/pdf/10.1139/f01-138 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Fisheries and Aquatic Sciences volume 58, issue 10, page 1957-1963 ISSN 0706-652X 1205-7533 Aquatic Science Ecology, Evolution, Behavior and Systematics journal-article 2001 crcansciencepubl https://doi.org/10.1139/f01-138 2024-03-08T00:37:41Z An important aspect of a predatorprey system is the functional response of the predator to changing prey densities. We studied the feeding rate response of drift-feeding Arctic grayling (Thymallus arcticus) on a small invertebrate prey, Daphnia middendorffiana, at densities ranging from 0.01 L 1 to 1.8 L 1 and current velocities of 25, 32, and 40 cm·s 1 . We videotaped the feeding of grayling to determine the duration of the search and pursuit components of the feeding cycle and the location efficiency of grayling feeding at different current velocities. Feeding rate increased approximately as the prey density to the 0.4 power from 0.01 to 1.25 prey·L 1 , above which the feeding rate dropped. Current velocity had no significant effect on feeding rate. Search and pursuit times dropped with increasing prey density, but neither was affected by current velocity. However, current velocity reduced both maximum location distance and location efficiency. The lack of increase in feeding rate with increasing current velocity may be due to a trade-off between the increasing likelihood of encounter and decreasing location efficiency as current velocity increases. These data suggest that grayling could effectively feed in a variety of stream habitats with different current velocity. Article in Journal/Newspaper Arctic grayling Arctic Thymallus arcticus Canadian Science Publishing Arctic Canadian Journal of Fisheries and Aquatic Sciences 58 10 1957 1963 |
institution |
Open Polar |
collection |
Canadian Science Publishing |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Aquatic Science Ecology, Evolution, Behavior and Systematics O'Brien, W John Barfield, Michael Sigler, Karen The functional response of drift-feeding Arctic grayling: the effects of prey density, water velocity, and location efficiency |
topic_facet |
Aquatic Science Ecology, Evolution, Behavior and Systematics |
description |
An important aspect of a predatorprey system is the functional response of the predator to changing prey densities. We studied the feeding rate response of drift-feeding Arctic grayling (Thymallus arcticus) on a small invertebrate prey, Daphnia middendorffiana, at densities ranging from 0.01 L 1 to 1.8 L 1 and current velocities of 25, 32, and 40 cm·s 1 . We videotaped the feeding of grayling to determine the duration of the search and pursuit components of the feeding cycle and the location efficiency of grayling feeding at different current velocities. Feeding rate increased approximately as the prey density to the 0.4 power from 0.01 to 1.25 prey·L 1 , above which the feeding rate dropped. Current velocity had no significant effect on feeding rate. Search and pursuit times dropped with increasing prey density, but neither was affected by current velocity. However, current velocity reduced both maximum location distance and location efficiency. The lack of increase in feeding rate with increasing current velocity may be due to a trade-off between the increasing likelihood of encounter and decreasing location efficiency as current velocity increases. These data suggest that grayling could effectively feed in a variety of stream habitats with different current velocity. |
format |
Article in Journal/Newspaper |
author |
O'Brien, W John Barfield, Michael Sigler, Karen |
author_facet |
O'Brien, W John Barfield, Michael Sigler, Karen |
author_sort |
O'Brien, W John |
title |
The functional response of drift-feeding Arctic grayling: the effects of prey density, water velocity, and location efficiency |
title_short |
The functional response of drift-feeding Arctic grayling: the effects of prey density, water velocity, and location efficiency |
title_full |
The functional response of drift-feeding Arctic grayling: the effects of prey density, water velocity, and location efficiency |
title_fullStr |
The functional response of drift-feeding Arctic grayling: the effects of prey density, water velocity, and location efficiency |
title_full_unstemmed |
The functional response of drift-feeding Arctic grayling: the effects of prey density, water velocity, and location efficiency |
title_sort |
functional response of drift-feeding arctic grayling: the effects of prey density, water velocity, and location efficiency |
publisher |
Canadian Science Publishing |
publishDate |
2001 |
url |
http://dx.doi.org/10.1139/f01-138 http://www.nrcresearchpress.com/doi/pdf/10.1139/f01-138 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic grayling Arctic Thymallus arcticus |
genre_facet |
Arctic grayling Arctic Thymallus arcticus |
op_source |
Canadian Journal of Fisheries and Aquatic Sciences volume 58, issue 10, page 1957-1963 ISSN 0706-652X 1205-7533 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/f01-138 |
container_title |
Canadian Journal of Fisheries and Aquatic Sciences |
container_volume |
58 |
container_issue |
10 |
container_start_page |
1957 |
op_container_end_page |
1963 |
_version_ |
1795663075580313600 |