A Regional Approach for Monitoring Salmonid Status and Trends: Results from a Pilot Study in Coastal Mendocino County, California
| Autor: | Sean P. Gallagher, Peter B. Adams, David W. Wright, Barry W. Collins |
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| Rok vydání: | 2010 |
| Předmět: |
education.field_of_study
Fish migration Ecology biology Population Endangered species Sampling (statistics) Management Monitoring Policy and Law Aquatic Science biology.organism_classification Monitoring program Fishery Sampling design Environmental science Oncorhynchus education Ecology Evolution Behavior and Systematics Escapement |
| Zdroj: | North American Journal of Fisheries Management. 30:1075-1085 |
| ISSN: | 1548-8675 0275-5947 |
| DOI: | 10.1577/m09-203.1 |
| Popis: | In coastal California, many evolutionarily significant units (ESUs) of Chinook salmon Oncorhynchus tshawytscha, coho salmon O. kisutch, and steelhead O. mykiss are listed under the federal Endangered Species Act (ESA). Monitoring species status at the ESU or ESU subdivision scale requires specialized sampling. The purposes of this study were (1) to evaluate abundance estimated from a generalized random tessellation stratified (GRTS) design and compare the results with those from a more intensive stratified random monitoring program and (2) to evaluate the statistical power of the design to detect population trends. This 3-year pilot study considered five Mendocino County streams as an example region of coastal California to evaluate a two-stage sampling approach for monitoring regional escapement. Under this scheme, regional redd surveys (stage 1) were conducted in stream reaches in a GRTS sampling design. Ten percent of anadromous habitat was sampled in year 1 and 10–35% in years 2 and 3. Spawne... |
| Databáze: | OpenAIRE |
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