Accession Number : ADA322806
Title : Population Characteristics and Simulation: Modeling of Black Ducks.
Descriptive Note : Doctoral thesis,
Corporate Author : CLARK UNIV WORCESTER MA DEPT OF BIOLOGY
Personal Author(s) : Blandin, Warren W.
PDF Url : ADA322806
Report Date : 1992
Pagination or Media Count : 224
Abstract : This study was initiated because of concern for the population status of black ducks, and because excessive black duck harvest has been implicated in the decline of the black duck population as evidenced by Winter Survey trends. A review of literature about black duck distribution, migration, and population dynamics is presented. The preseason and winter handing and recovery files are described and their limitations are discussed. Twenty-seven preseason major reference areas of banding and 15 winter major reference areas of banding are defined. Annual estimates of recovery rates and survival rates and their sampling variances are shown for each age and sex group for preseason and winter bandings in 6 appendixes. Survival rates in years of liberal hunting regulations are similar to survival rates in years of restrictive regulations. This supports the idea that hunting mortality is largely compensated for by a reciprocal response in natural mortality.
Descriptors : *MODELS, *POPULATION, *DUCKS, SIMULATION, RECOVERY, SURVIVABILITY, DISTRIBUTION, DYNAMICS, WINTER, SURVEYS, RESPONSE, SAMPLING, PATTERNS, MIGRATION, MARKERS.
Subject Categories : Ecology
Distribution Statement : APPROVED FOR PUBLIC RELEASE