A seventeen-year study of the rose star Crossaster papposus population in a coastal bay in southeast Alaska |
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| Authors: | H R Carlson C A Pfister |
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| Institution: | (1) Auke Bay Laboratory, Alaska Fisheries Science Center, National Marine Fisheries Service, NOAA, 11305 Glacier Highway, Juneau, Alaska 99801-8626, USA Fax: 011 (0)907-789-6094 e-mail: Dick.Carlson@noaa.gov, US;(2) Department of Ecology and Evolution, University of Chicago, 1101 East 57th Street, Chicago, Illinois 60637, USA, US |
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| Abstract: | A 17 yr study of a population of the rose star Crossaster papposus (Linnaeus, 1767) in Auke Bay, near Juneau, Alaska, used SCUBA to follow a total of 956 individually marked stars. Population
density was relatively constant over the 17 yr of study, although the influx of smaller individuals varied by an order of
magnitude. Growth in diameter of individual stars was inversely related to size, with the largest individuals showing negligible
growth for periods of months or years. Annual survivorship was relatively high (from 76.3 to 90.4%), and some individuals
persisted throughout the study, indicating longevities of at least 20 yr in this species. Observations of food habits indicated
that the principal prey item is the reddish scallop Chlamys rubida. In summary, this rose star population was characterized by a relatively stable number of long-lived, slow-growing individuals.
Received: 7 April 1998 / Accepted: 5 October 1998 |
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