Does the rate of foraging attempts predict ingestion rate for young-of-the-year brook trout (Salvelinus fontinalis) in the field?

Biro, Peter A., Ridgway, Mark S. and McLaughlin, Robert L. 1996, Does the rate of foraging attempts predict ingestion rate for young-of-the-year brook trout (Salvelinus fontinalis) in the field?, Canadian journal of fisheries and aquatic sciences, vol. 53, no. 8, pp. 1814-1820.

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Title Does the rate of foraging attempts predict ingestion rate for young-of-the-year brook trout (Salvelinus fontinalis) in the field?
Author(s) Biro, Peter A.
Ridgway, Mark S.
McLaughlin, Robert L.
Journal name Canadian journal of fisheries and aquatic sciences
Volume number 53
Issue number 8
Start page 1814
End page 1820
Total pages 7
Publisher N R C Research Press
Place of publication Ottawa, Ont.
Publication date 1996
ISSN 0706-652X
1205-7533
Keyword(s) brook trout
foraging
ingestion rate
salvelinus fontinalis
Summary To assess the costs and benefits of young fish adopting different behavioural tactics, field studies of juvenile salmonines have assumed that (but did not test whether) the rate of foraging attempts predicts ingestion rate. We tested this assumption by quantifying capture, ingestion, and rejection rates of potential prey items for individual young-of-the-year brook trout (Salvelinus fontinalis) in a lake. Overall, capture rate (a conservative estimate of the rate of foraging attempts) was only a fair predictor of overall ingestion rate (Kendall's 1 = 0.54) and only 46% of captured items (number/minute) were ingested. Surface capture rate was a poor predictor of surface ingestion rate (T = 0.27) and only 1% of captured items were ingested. In contrast, subsurface capture rate was an excellent predictor of subsurface ingestion rate (T = 0.75) and 93% of captured items were ingested. No benthic prey captures were observed. Fish that ingested a low proportion of captured items spent a greater proportion of time moving, moved faster, and pursued prey further than fish that ingested a higher proportion of captured items. Rejection of captured items can represent a significant and little appreciated component of the foraging cycle for young salmonid fishes.
Language eng
Field of Research 060201 Behavioural Ecology
060801 Animal Behaviour
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©1996, NRC Canada
Persistent URL http://hdl.handle.net/10536/DRO/DU:30047772

Document type: Journal Article
Collection: School of Life and Environmental Sciences
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