Skip to Main Content
Multi-scale effects of resource patchiness on foraging behaviour and habitat use by longnose dace, Rhinichthys cataractaeAuthor(s): Andrew R. Thompson; J. Todd Petty; Gary D. Grossman
Source: Freshwater Biology (2001) 46, 145-160
Publication Series: Miscellaneous Publication
PDF: View PDF (1.2 MB)
Description1. We examined the response of a predatory benthic fish, the longnose dace (Rhinichthys cataractae), to patchiness in the distribution of benthic macroinvertebrates on cobbles at three hierarchical spatial scales during summer and autumn 1996, and spring 1997 in a southern Appalachian stream. 2. At the primary scale (four to five individual cobbles separated by <1 m), the intensity of foraging was not correlated with the biomass of benthic macroinvertebrates/cobble, regardless of season. 3. At the secondary scale (i.e. foraging patches <5 m in diameter) we found that benthic macroinvertebrates were patchily distributed in summer, but not in autumn or spring. Concomitantly, in summer, longnose dace foraged on cobbles with a significantly higher biomass of benthic macronvertebrates than nearby, randomly selected cobbles with similar physical conditions (i.e. longnose dace tended to avoid low-prey foraging patches). In contrast, when benthic macroinvertebrates were distributed homogeneously (spring and autumn), dace did not select patches with a significantly higher biomass of benthic macroinvertebrates than that available on randomly selected cobbles. 4. At the tertiary scale (i.e. stream reaches 11-19 m long), the biomass of benthic macroinvertebrates (per cobble per reach) was patchily distributed (i.e. differed significantly among reaches) in all seasons. Among reaches with physical characteristics preferred by longnose dace, (i.e. erosional reaches dominated by cobble boulder substratum and high current velocity), we detected a sigruficant, positive correlation between the biomass of benthic macroinvertebrates/cobble and longnose dace density in all seasons.
- You may send email to firstname.lastname@example.org to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationThompson, Andrew R.; Petty, J. Todd; Grossman, Gary D. 2001. Multi-scale effects of resource patchiness on foraging behaviour and habitat use by longnose dace, Rhinichthys cataractae. Freshwater Biology (2001) 46, 145-160
Keywordsforaging patch, habitat selection, predator-prey, spatial heterogeneic, stream fish
- The effects of an underwater fish observation technique on stream macroinvertebrates at two spatial scales
- Turbidity affects foraging success of drift-feeding rosyide dace
- Patch based predation in a southern Appalachian stream
XML: View XML