Population Genetic Structure of the Northern Idaho Ground Squirrel (Spermophilus brunneus brunneus)

Spermophilus brunneus is one of the rarest species of North American ground squirrels. It occurs in just five counties in western Idaho. We sampled blood from 14-64 individuals in 11 populations of the northern subspecies S. b. brunneus. Analyses of allozymes at five polymorphic loci revealed signif...

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Veröffentlicht in:Journal of mammalogy 1999-02, Vol.80 (1), p.156-168
Hauptverfasser: Gavin, Thomas A., Sherman, Paul W., Yensen, Eric, May, Bernie
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Sherman, Paul W.
Yensen, Eric
May, Bernie
description Spermophilus brunneus is one of the rarest species of North American ground squirrels. It occurs in just five counties in western Idaho. We sampled blood from 14-64 individuals in 11 populations of the northern subspecies S. b. brunneus. Analyses of allozymes at five polymorphic loci revealed significant population structure (F ST=0.167). Four populations located within a 2-km radius in Bear Meadow (Adams Co.) were indistinguishable with respect to allelic frequencies (Nei's D = 0.002), but the remaining seven, more distant populations (also in Adams Co.) were differentiated from this group and from each other. F ST values ranged from 0.034 to 0.124 when the four populations in Bear Meadow were pooled and compared with each of the seven isolated populations. Regression of Slatkin's M̂ against geographic distance among the 55 pairwise comparisons of populations suggested a strong effect of isolation-by-distance, consistent with a one-dimensional stepping-stone model of gene flow. Significant genetic structure in S. b. brunneus populations apparently is due to genetic drift in populations with small N e (i. e., 20-50), reinforced by lack of gene flow following recent habitat fragmentation. Fragmentation results from the shrinking of meadows due to invasion by conifers, itself the consequence of fire suppression in the past 100 years.
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It occurs in just five counties in western Idaho. We sampled blood from 14-64 individuals in 11 populations of the northern subspecies S. b. brunneus. Analyses of allozymes at five polymorphic loci revealed significant population structure (F ST=0.167). Four populations located within a 2-km radius in Bear Meadow (Adams Co.) were indistinguishable with respect to allelic frequencies (Nei's D = 0.002), but the remaining seven, more distant populations (also in Adams Co.) were differentiated from this group and from each other. F ST values ranged from 0.034 to 0.124 when the four populations in Bear Meadow were pooled and compared with each of the seven isolated populations. Regression of Slatkin's M̂ against geographic distance among the 55 pairwise comparisons of populations suggested a strong effect of isolation-by-distance, consistent with a one-dimensional stepping-stone model of gene flow. Significant genetic structure in S. b. brunneus populations apparently is due to genetic drift in populations with small N e (i. e., 20-50), reinforced by lack of gene flow following recent habitat fragmentation. Fragmentation results from the shrinking of meadows due to invasion by conifers, itself the consequence of fire suppression in the past 100 years.</abstract><cop>Provo, UT</cop><pub>American Society of Mammalogists</pub><doi>10.2307/1383216</doi><tpages>13</tpages><oa>free_for_read</oa></addata></record>
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source Jstor Complete Legacy; Oxford University Press Journals All Titles (1996-Current)
subjects Animal populations
Animals
Biological and medical sciences
Evolution
Fundamental and applied biological sciences. Psychology
Gene flow
Gene frequency
Genetic loci
Genetic structure
Genetics
Genetics of eukaryotes. Biological and molecular evolution
Ground squirrels
isoenzymes
Population genetics
Population genetics, reproduction patterns
Population size
Population structure
Rodents
Spermophilus brunneus brunneus
Squirrels
Valleys
Vertebrata
Zoology
title Population Genetic Structure of the Northern Idaho Ground Squirrel (Spermophilus brunneus brunneus)
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