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Experimental Data for Drift-Foraging Models: What's New and What's Next
Karlstad University, Faculty of Social and Life Sciences, Department of Biology.
Karlstad University, Faculty of Social and Life Sciences, Department of Biology.ORCID iD: 0000-0002-4417-6636
Karlstad University, Faculty of Social and Life Sciences, Department of Biology.ORCID iD: 0000-0002-3191-7140
2011 (English)Conference paper, (Refereed)
Abstract [en]

Estimating net energy intake (NEI) of is a key requirement in a new suite of models being developed to assess habitat quality for stream fish.  To estimate NEI, habitat quality models use a drift-foraging sub-model, typically based on Hughes and Dill's (1990, CJFAS) well-known model.  The Hughes and Dill model estimates the energetic costs and benefits of a fish's position in the stream based upon swimming costs and prey capture success. The model includes a number of unrealistic assumptions about prey detection and capture, and swimming costs, however, some of which might be addressed through lab or field experiments. Here we present the results of some recent experiments on the effects of water depth and velocity, and cold temperatures, on the foraging success of juvenile salmonids. We demonstrate that prey capture success is reduced by both faster velocities and colder temperatures, and that swimming costs appear to play a minor role in estimating NEI.  We also report on the effects of fish species and size. In general, much experimental work remains to be done in the area of drift foraging theory, however, and we will discuss ongoing research and future needs.

Place, publisher, year, edition, pages
2011.
National Category
Ecology
Research subject
Biology
Identifiers
URN: urn:nbn:se:kau:diva-12500OAI: oai:DiVA.org:kau-12500DiVA: diva2:511825
Conference
American Fisheries Society 141st annual meeting. Seattle, Washington, Sept. 4-8, 2011.
Available from: 2012-03-23 Created: 2012-03-23 Last updated: 2016-11-23Bibliographically approved

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