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  E-mail Message: I thought you might be interested in this item at http://www.worldcat.org/oclc/117782799 Title: Quantitative genetics of maximal oxygen consumption in a garter snake. Publisher: ISBN/ISSN: 0002-9513 OCLC:117782799

  
  

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Quantitative genetics of maximal oxygen consumption in a garter snake.

Author:	Garland T Jr; AF Bennett
Edition/Format:	Article : English
Publication:	The American journal of physiology, 1990 Nov; 259(5) Pt 2: R986-92
Database:	From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
Summary:	Broad-sense heritabilities and genetic correlations of maximal oxygen consumption (VO2max), blood hemoglobin levels, and ventricle mass were estimated in a natural population of snakes. Traits were measured for six or fewer presumed full-sibling offspring from each of 45 wild-caught gravid garter snakes (Thamnophis sirtalis). VO2max was highly reproducible between replicate trial days (r = 0.88). In an attempt to reduce maternal effects, correlations of each character with body mass, snout-vent length, age at testing, litter size, dam mass, and dam snout-vent length were removed by computing residuals from multiple-regression equations. These residuals were used in subsequent genetic analyses. Approximate coefficients of variation of residuals were 16% for VO2max, 19% for hemoglobin level, and 13% for ventricle mass. Broad-sense heritabilities were highly significant for all characters [P less than 0.0001; VO2max heritability (h2) = 0.88; hemoglobin level h2 = 0.63; ventricle mass h2 = 0.41], suggesting that they could respond genetically to selection. Phenotypic correlations (rP) among residual characters were significant only between VO2max and ventricle mass (rP = +0.27). VO2max and ventricle mass exhibited a significant (broad-sense) genetic correlation of +0.64; this might facilitate the correlated evolution of these two traits in response to natural or artificial selection. Ventricle mass and hemoglobin level showed a significant environmental correlation of +0.43. Treadmill endurance crawling time (Evolution 42: 335-350, 1988) showed a weak but significantly positive rP with VO2max (rP = +0.17).  Read more...
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