Dennis Devries

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Patch-use behaviour of small bluegill sunfish, Lepomis macrochirus, foraging for chironomid larvae, Chironomus riparius, was investigated in artificial macrophyte patches to examine search pattern within a patch and to determine the decision rule used by fish when leaving a patch. Fish were exposed to a sequence of habitats which differed in quality (i.e.(More)
—To test potential competitive interactions between larvae of white crappie Pomoxis annularis and of gizzard shad Dorosoma cepedianum. we added adult gizzard shad to eight of twelve 0.1-ha ponds that had been stocked with adult white crappies. Larval white crappies and larval gizzard shad appeared within 1 week of one another and larval white crappie(More)
To study matching in a species distantly related to mammals and birds, seven bluegill were trained to break a photobeam using a nose-poke response for access to pelleted food in their home aquaria during one-h sessions. Reinforcer ratios available from the two response alternatives varied among the following: 16:1, 8:1, 4:1, 1:1, 1:4, 1:8, and 1:16. The(More)
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