High rate of redd superimposition by brook trout (Salvelinus fontinalis) and brown trout (Salmo trutta) in a Minnesota stream cannot be explained by habitat availability alone

This study was conducted to test the hypothesis that redd superimposition by salmonine fishes is a consequence of limited habitat availability. We monitored redd site selection by brook trout (Salvelinus fontinalis) and brown trout (Salmo trutta) for two spawning seasons in Valley Creek, Minnesota....

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Bibliographic Details
Published in:Canadian journal of fisheries and aquatic sciences 1998-10, Vol.55 (10), p.2310-2316
Main Authors: Essington, Timothy E, Sorensen, Peter W, Paron, Dean G
Format: Article
Language:English
Subjects:
Agnatha and pisces
Animal ethology
Animal reproduction
Biological and medical sciences
Breeding
Fish
Fish migration
Freshwater
Fundamental and applied biological sciences. Psychology
Habitat availability
Habitats
Psychology. Psychoanalysis. Psychiatry
Rivers
Salmo trutta
Salvelinus fontinalis
Site selection
Spawning
Trout
Vertebrata
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Summary:This study was conducted to test the hypothesis that redd superimposition by salmonine fishes is a consequence of limited habitat availability. We monitored redd site selection by brook trout (Salvelinus fontinalis) and brown trout (Salmo trutta) for two spawning seasons in Valley Creek, Minnesota. Redd superimposition rates were high; over one half of the brook trout and one third of the brown trout superimposed redds. We tested the role of habitat availability in this process by characterizing microhabitat at sites with and without redds in four small sections of this stream and then determined whether superimposition could be explained by random dispersal of fish over available habitat. Brown trout preferred spawning sites with high flows whereas brook trout strongly preferred deep sites with upwelling groundwater. No relationship was observed between fish density and superimposition. Additionally, the observed frequency of superimposition was greater than expected by chance in six of eight instances for brown trout and in one of three instances for brook trout. Finally, a behavioral experiment provided direct evidence that females have a behavioral preference to spawn on existing redd sites, suggesting that factors other than habitat may determine redd site selection and hence superimposition.
ISSN:0706-652X
1205-7533
DOI:10.1139/f98-109