Sand Sediment in a Michigan Trout Stream, Part II. Effects of Reducing Sand, Bedload on a Trout Population
| Autor: | Gaylord R. Alexander, Edward A. Hansen |
|---|---|
| Rok vydání: | 1983 |
| Předmět: |
endocrine system
education.field_of_study animal structures Ecology biology urogenital system animal diseases Population Sediment Management Monitoring Policy and Law Aquatic Science Sedimentation biology.organism_classification digestive system Sediment basin Fishery Brown trout Trout Environmental science Rainbow trout Salmo education Ecology Evolution Behavior and Systematics |
| Zdroj: | North American Journal of Fisheries Management. 3:365-372 |
| ISSN: | 1548-8675 0275-5947 |
| DOI: | 10.1577/1548-8659(1983)3<365:ssiamt>2.0.co;2 |
| Popis: | This is the second of a two-part sedimentation study. A sediment basin excavated in a Michigan trout stream reduced the sandy bedload sediment by 86% (from 56 ppm down to 8 ppm). Following the reduction in bedload, trout numbers increased significantly during the next 6 years. Small or young trout increased about 40% throughout the treated area. Larger and older trout increased in that part of the treated area that had an erodible sand bed. Although trout production increased 28%, growth rate of the trout changed but little. Both brown trout (Salmo trutta) and rainbow trout (Salmo gairdneri) populations responded similarly to the bedload reduction. However, statistical tests were more conclusive for brown trout than for rainbow trout because of the lower year-to-year variation of the brown trout population. The results suggested that in-stream sediment basins are an effective means for removing sand bedload and that even small amounts of moving-sand bedload sediments can have a major impact on a ... |
| Databáze: | OpenAIRE |
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