Postcatastrophe population dynamics and density dependence of an endemic island duck
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Abstract
Laysan ducks (Anas laysanensis) are restricted to approximately 9 km2 in the Northwestern Hawaiian Islands, USA. To evaluate the importance of density dependence for Laysan ducks, we conducted a Bayesian analysis to estimate the parameters of a Gompertz model and the magnitude of process variation and observation error based on the fluctuations in Laysan duck abundance on Laysan Island from 1994 to 2007. This model described a stationary distribution for the population at carrying capacity that fluctuates around a long-term mean of 456 ducks and is between 316 to 636 ducks 95% of the time. This range of expected variability can be used to identify changes in population size that warn of catastrophic events. Density-dependent population dynamics may explain the recovery of Laysan duck from catastrophic declines and allow managers to identify population monitoring thresholds.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Postcatastrophe population dynamics and density dependence of an endemic island duck |
| Series title | Journal of Wildlife Management |
| DOI | 10.2193/2007-420 |
| Volume | 73 |
| Issue | 3 |
| Year Published | 2009 |
| Language | English |
| Publisher | BioOne |
| Contributing office(s) | Patuxent Wildlife Research Center |
| Description | 5 p. |
| First page | 414 |
| Last page | 418 |
| Google Analytic Metrics | Metrics page |