Emergence chronology of brook charr,Salvenus fontinalis,alevins in an acidic stream |
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| Authors: | R Alle Curry Perce M Powles John M Gunn Victor A Liimatainen |
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| Institution: | (1) Department of Biology, Trent University, K9J 7B8 Peterborough, Ontario, Canada;(2) Present address: Department of Zoology, University of Guelph, N1G 2W1 Guelph, Ontario, Canada;(3) Ministry of Natural Resources, Cooperative Fisheries Unit, Department of Biology, Laurentian University, P3E 2C6 Sudbury, Ontario, Canada;(4) Box 1103, P0M 1N0 Coppercliff, Ontario, Canada |
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| Abstract: | Synopsis The emergence chronology of brook charr alevins in the Chikanishing River, Ontario, Canada and the concurrent changes in stream chemistry resulting from acidic snowmelt runoff were examined during the spring, 1986–1988. Emergence patterns were similar among years with the most intense emergence (> 70%) occurring during the declining stream discharge following the spring flood. This period coincided with stream pH depressions (minimum pH 5.2) in 2 of 3 years, suggesting emergence behaviour frequently subjects the earliest free-swimming life interval of brook charr to episodic acidification events. |
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| Keywords: | Acidic deposition Snowmelt runoff Stream pH depressions Early life history Salmonid fish |
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