Coastal Cutthroat Trout Redd Counts Impacted by Natural Water Supply Variations
| Autor: | Steven N. Boessow, Jonathan H. Kohr, Hal A. Beecher, Robert L. Vadas |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
Watershed Ecology biology National park 010604 marine biology & hydrobiology Natural water 04 agricultural and veterinary sciences Management Monitoring Policy and Law Aquatic Science biology.organism_classification 01 natural sciences Fishery Trout 040102 fisheries 0401 agriculture forestry and fisheries Oncorhynchus Environmental science Juvenile Ecology Evolution Behavior and Systematics |
| Zdroj: | North American Journal of Fisheries Management. 36:900-912 |
| ISSN: | 1548-8675 0275-5947 |
| Popis: | During 2001–2003, we counted redds of Coastal Cutthroat Trout Oncorhynchus clarkii clarkii and measured microhabitat variables at fresh redds in Irely Creek upstream of Irely Lake in a largely undisturbed watershed within Olympic National Park, Washington. Redd numbers declined abruptly in 2003, the year after a dry summer caused the dewatering of Irely Lake; therefore, we continued the redd counts during 2004–2012 to determine whether pond dewatering was a factor in the decline and whether redd counts would track Irely Lake surface area. The estimated number of redds varied from a high of 51 (in 2002) to a low of 2 (in 2006, 2007, and 2010); increases in estimated redd number occurred after wetter summers, and decreases were observed after drier summers. This pattern was significant in chi-square tests for redd number and the change in redd number with Irely Lake condition in the preceding year (dry, semi-dry, or wet). Rather than indicating juvenile mortality, the lack of a lag in response sugge... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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