Size‐scaling of zooplankton foraging in Arctic charr
Prey capture rate (number of prey s −1 ) and the mode of feeding of Arctic charr Salvelinus alpinus were studied by performing foraging experiments with two sizes (1·1 and 1·8 mm) of Daphnia longispina prey. Arctic charr were particulate feeders at all densities tested. Adjusted for the effect of pr...
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crwiley:10.1046/j.1095-8649.2003.00071.x 2024-06-02T08:00:01+00:00 Size‐scaling of zooplankton foraging in Arctic charr Jansen, P. A. Finstad, A. G. Langeland, A. 2003 http://dx.doi.org/10.1046/j.1095-8649.2003.00071.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1095-8649.2003.00071.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1095-8649.2003.00071.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Fish Biology volume 62, issue 4, page 860-870 ISSN 0022-1112 1095-8649 journal-article 2003 crwiley https://doi.org/10.1046/j.1095-8649.2003.00071.x 2024-05-03T11:33:30Z Prey capture rate (number of prey s −1 ) and the mode of feeding of Arctic charr Salvelinus alpinus were studied by performing foraging experiments with two sizes (1·1 and 1·8 mm) of Daphnia longispina prey. Arctic charr were particulate feeders at all densities tested. Adjusted for the effect of prey density, the capture rate showed a hump‐shaped relationship with Arctic charr size for both sizes of D. longispina . Estimated attack rates ( a ) also tended to show a hump‐shaped relationship with fish size. The estimated size‐scaling exponent of the attack rate function, however, was relatively small, implying small changes in attack rate over fish sizes. Simultaneous estimations of a and handling time were used in combination with published data on fish metabolism and dry mass rations of prey to estimate maintenance resource density of prey as a function of Arctic charr mass. Maintenance resource densities increased monotonically with Arctic charr size, and rapidly as optimum fish size relative to attack rate on prey was passed. Article in Journal/Newspaper Arctic charr Arctic Salvelinus alpinus Zooplankton Wiley Online Library Arctic Journal of Fish Biology 62 4 860 870 |
institution |
Open Polar |
collection |
Wiley Online Library |
op_collection_id |
crwiley |
language |
English |
description |
Prey capture rate (number of prey s −1 ) and the mode of feeding of Arctic charr Salvelinus alpinus were studied by performing foraging experiments with two sizes (1·1 and 1·8 mm) of Daphnia longispina prey. Arctic charr were particulate feeders at all densities tested. Adjusted for the effect of prey density, the capture rate showed a hump‐shaped relationship with Arctic charr size for both sizes of D. longispina . Estimated attack rates ( a ) also tended to show a hump‐shaped relationship with fish size. The estimated size‐scaling exponent of the attack rate function, however, was relatively small, implying small changes in attack rate over fish sizes. Simultaneous estimations of a and handling time were used in combination with published data on fish metabolism and dry mass rations of prey to estimate maintenance resource density of prey as a function of Arctic charr mass. Maintenance resource densities increased monotonically with Arctic charr size, and rapidly as optimum fish size relative to attack rate on prey was passed. |
format |
Article in Journal/Newspaper |
author |
Jansen, P. A. Finstad, A. G. Langeland, A. |
spellingShingle |
Jansen, P. A. Finstad, A. G. Langeland, A. Size‐scaling of zooplankton foraging in Arctic charr |
author_facet |
Jansen, P. A. Finstad, A. G. Langeland, A. |
author_sort |
Jansen, P. A. |
title |
Size‐scaling of zooplankton foraging in Arctic charr |
title_short |
Size‐scaling of zooplankton foraging in Arctic charr |
title_full |
Size‐scaling of zooplankton foraging in Arctic charr |
title_fullStr |
Size‐scaling of zooplankton foraging in Arctic charr |
title_full_unstemmed |
Size‐scaling of zooplankton foraging in Arctic charr |
title_sort |
size‐scaling of zooplankton foraging in arctic charr |
publisher |
Wiley |
publishDate |
2003 |
url |
http://dx.doi.org/10.1046/j.1095-8649.2003.00071.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1095-8649.2003.00071.x https://onlinelibrary.wiley.com/doi/pdf/10.1046/j.1095-8649.2003.00071.x |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic charr Arctic Salvelinus alpinus Zooplankton |
genre_facet |
Arctic charr Arctic Salvelinus alpinus Zooplankton |
op_source |
Journal of Fish Biology volume 62, issue 4, page 860-870 ISSN 0022-1112 1095-8649 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1046/j.1095-8649.2003.00071.x |
container_title |
Journal of Fish Biology |
container_volume |
62 |
container_issue |
4 |
container_start_page |
860 |
op_container_end_page |
870 |
_version_ |
1800744037271994368 |