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Population demographics and genetic diversity in remnant and translocated populations of sea otters

Conservation Biology

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Abstract

The effects of small population size on genetic diversity and subsequent population recovery are theoretically predicted, but few empirical data are available to describe those relations. We use data from four remnant and three translocated sea otter (Enhydra lutris) populations to examine relations among magnitude and duration of minimum population size, population growth rates, and genetic variation. Metochondrial (mt)DNA haplotype diversity was correlated with the number of years at minimum population size (r = -0.741, p = 0.038) and minimum population size (r = 0.709, p = 0.054). We found no relation between population growth and haplotype diversity, altough growth was significantly greater in translocated than in remnant populations. Haplotype diversity in populations established from two sources was higher than in a population established from a single source and was higher than in the respective source populations. Haplotype frequencies in translocated populations of founding sizes of 4 and 28 differed from expected, indicating genetic drift and differential reproduction between source populations, whereas haplotype frequencies in a translocated population with a founding size of 150 did not. Relations between population demographics and genetic characteristics suggest that genetic sampling of source and translocated populations can provide valuable inferences about translocations.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Population demographics and genetic diversity in remnant and translocated populations of sea otters
Series title:
Conservation Biology
Volume
13
Issue:
6
Year Published:
1999
Language:
English
Contributing office(s):
Alaska Biological Science Center
Description:
pp. 1378-1385
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Conservation Biology
First page:
1378
Last page:
1385
Number of Pages:
8