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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/40129

Title: Pup Production of Harp Seals, Phoca groenlandica, in the Northwest Atlantic
Authors: G. B. Stenson;R. A. Myers;M. O. Hammill;I-Hsun Ni;W. G. Warren;Michael C. S. Kingsley
Contributors: 國立台灣海洋大學:環境生物與漁業學系
Date: 1993
Issue Date: 2017-01-16T01:17:17Z
Publisher: Canadian Journal of Fisheries and Aquatic Sciences
Abstract: Abstract:Northwest Atlantic harp seal, Phoca groenlandica, pup production was estimated from aerial surveys flown off eastern Newfoundland ("Front") and in the Gulf of St. Lawrence ("Gulf") during March 1990. One visual and two independent photographic estimates were obtained at the Front; a single photographic estimate was obtained in the Gulf. Photographic estimates were corrected for misidentified pups by comparing black-and-white photographs with ultraviolet imagery. Estimates were also corrected for pups absent from the ice at the time of the survey using distinct age-related developmental stages. Stage durations in the Gulf appeared consistent with previous studies but were increased by 30% to improve the fit to staging data collected at the Front. The best estimate of pup production at the Front was obtained from the visual surveys. A total of 467 000 (SE = 31 000) pups were born in three whelping concentrations. The photographic estimates were comparable. Pup production estimates for the southern (Magdalen Island) and northern (Mecatina) Gulf whelping patches were 106 000 (SE = 23 000) and 4 400 (SE = 1300), respectively. Thus, total pup production was estimated to be 578 000 (SE = 39 000).
Relation: 50(11), pp.2429-2439
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/40129
Appears in Collections:[環境生物與漁業科學學系] 期刊論文

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