Postcatastrophe population dynamics and density dependence of an endemic island duck

Journal of Wildlife Management
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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.

Additional publication details

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
Volume 73
Issue 3
Year Published 2009
Language English
Contributing office(s) Patuxent Wildlife Research Center
Description 414-418
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Journal of Wildlife Management
First page 414
Last page 418