Estimating pup production and population size of the northwest Atlantic harp seal (Phoca groenlandica) [electronic resource] / B.P. Healey and G.B. Stenson
- Canadian Stock Assessment Secretariat research document, 1480-4883 ; 2000/081
- Restrictions on Access:
- Free-to-read Unrestricted online access
- Pup production and population size of northwest Atlantic harp seals (Phoca groenlandica) for the period 1960 to 2000 were estimated using independent survey estimates of pup production, annual estimates of pregnancy rates, and age-structured removals. Removals included reported catch, estimated by-catch and assumed levels of seals killed but not landed (struck and lost). These data were fit to a three-parameter age structured population model that allows for differing assumptions of pup mortality. The two parameters estimated in the model are the pup selection parameter (s) and unaccounted mortality (m). The impact of assuming that the mortality of young seals (age class 0) was greater than that of seals one year of age and older (1+) was illustrated by using a fixed parameter (y) as the ratio of age class 0 mortality to that of older seals. Replacement yields were estimated using differing assumptions of the age structure of the harvest. The uncertainty associated with the estimates was determined by randomly re-sampling from within the sampling error of the pup production estimates.
- Bibliography Note:
- Includes bibliographical references (pages 13-16).
- Type of File/Data:
- Electronic monograph in PDF format.
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