| | Accession Number | 5001891 |
| | Title | Assumptions and caveats underlying population viability analysis |
| | Project Description | This project was undertaken in response to a request by the U.S. Fish and Wildlife Service to |
| | evaluate Population Viability Analysis (PVA) as a recovery tool for endangered species. The |
| | Service was requiring several of its field offices to conduct PVAs in the process of developing |
| | Recovery Plans. We were enlisted to assist with these PVAs and develop guidelines for biologists |
| | faced with the task of using this new management tool. Our goals were to elucidate the problems |
| | with PVAs and suggest guidelines for the proper use of PVAs. Specifically, we endeavored to |
| | show the consequences of assumptions and decisions made while conducting a PVA. Also, we |
| | developed a technique to increase the precision of PVAs, by calculating the sampling error |
| | separate from the temporal error of estimates of survivorship. |
| | Keywords | alex, lognormal distribution, model assumptions, model parameters, normal distribution, |
| | population dynamics, population viability analysis, probability of extinction, ramas, vortex, |
| | Principal | Carol I Bocetti, USGS Patuxent Wildlife Research Center: carol_bocetti@usgs.gov; Jeffrey S |
| | Investigators | Hatfield, USGS Patuxent Wildlife Research Center: jeffrey_hatfield@usgs.gov; James D Nichols, |
| | USGS Patuxent Wildlife Research Center: james_nichols@usgs.gov; Carol Beardmore, Partners |
| | in Flight: cbeardmore@gf.state.az.us; William R Gould, New Mexico State University: |
| | wgould@nmsu.edu; |
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