Authors
Saang-Yoon
Hyun
Rishi Sharma
Report Reference
#Japanese
Society of Fisheries Science 2007
73: 808-816
Publication Date
2007
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Bayesian
decision analysis for status of Snake River spring–summer Chinook
salmon Oncorhynchus tshawytscha populations at extinction risk
Abstract |
| The viability
of populations was assessed using population trend data and the Diffusion
Approximation (DA) model. Various extinction risk metrics for a population
are functions of the DA model parameters, and thus, estimates of the
DA model parameters are key quantities. Using Bayesian methods, we
showed uncertainty in those estimates, and further proceeded to a
decision analysis to assess viability of populations. These methods
were demonstrated using population trend data from return years since
1980 on naturally produced Snake River spring–summer Chinook
salmon Oncorhynchus tshawytscha populations. Of 19 populations
examined, the Catherine Creek population was assessed at serious risk,
Tucannon River Spring and Grande Ronde Upper Main stem populations
were assessed at minor risk, and the other populations were not at
risk. This assessment helps managers to prioritize populations at
risk for recovery management. |
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