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Effects of light on size-selectivity of kokanee feeding on Daphnia

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Planktivory by fingerling kokanee Oncorhynchus nerka feeding on Daphnia became more size-selective with increased illumination (0·1 v. 15 lux). The average difference in length of Daphnia (D. pulex and D. galeata) in trial arenas before and after kokanee feeding was 0·107 mm (P = 0·0007) at 0·1 lux and 0·371 mm (P < 0·0001) at 15 lux.

Keywords: Oncorhynchus nerka; planktivory; size-selective predation

Document Type: Research Article


Affiliations: Department of Fishery and Wildlife Biology, Colorado State University, Fort Collins, CO 80523-1474, U.S.A.

Publication date: June 1, 2003

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