Trends in abundance of Dall's porpoise in the western North Pacific, 1979 to 1989

B. J. Turnock; S. T. Buckland

Trends in abundance of Dall's porpoise in the western North Pacific, 1979 to 1989

School of Mathematics and Statistics

Research output: Contribution to journal › Article › peer-review

Abstract

Two density indices of Dall's porpoise abundance were estimated. One index is the density of animals estimated using line transect methods and the other is the encounter rate. The encounter rate increased significantly between 1979 and 1984, then fell between 1984 and 1986. The estimated density of animals showed no significant trend between 1979 and 1984. There was evidence of a fall in density between 1984 and 1986. -from Authors

Original language	English
Pages (from-to)	399-405
Number of pages	7
Journal	Reports of the International Whaling Commission, Special Issue
Publication status	Published - 1 Jan 1995

Cite this

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title = "Trends in abundance of Dall's porpoise in the western North Pacific, 1979 to 1989",

abstract = "Two density indices of Dall's porpoise abundance were estimated. One index is the density of animals estimated using line transect methods and the other is the encounter rate. The encounter rate increased significantly between 1979 and 1984, then fell between 1984 and 1986. The estimated density of animals showed no significant trend between 1979 and 1984. There was evidence of a fall in density between 1984 and 1986. -from Authors",

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AB - Two density indices of Dall's porpoise abundance were estimated. One index is the density of animals estimated using line transect methods and the other is the encounter rate. The encounter rate increased significantly between 1979 and 1984, then fell between 1984 and 1986. The estimated density of animals showed no significant trend between 1979 and 1984. There was evidence of a fall in density between 1984 and 1986. -from Authors

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Trends in abundance of Dall's porpoise in the western North Pacific, 1979 to 1989

Abstract

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