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Geographic Variation in the Dwarf Crayfish, Cambarellus Puer Hobbs (Decapoda, Cambaridae) 1)

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Geographic variation in the dwarf crayfish, Cambarellus puer, was studied. Computations were based on ten morphologic measurements from 583 adult specimens representing 34 localities. Analyses were conducted using univariate and multivariate statistical techniques on scaled and non-scaled data for comparison of results. A matrix of correlation among nine scaled morphologic characters was computed and the first three principal components extracted; these accounted for 71.6% of the variation in the character set among males and 70.9% among females. Three-dimensional projections of localities onto principal components show that animals from southeastern Texas are longer and more narrow in proportion to cephalothorax length, while animals from southern Arkansas and northern Louisiana are proportionately shorter and wider. Populations occurring along the Mississippi River and west into southern Louisiana are intermediate in shape. The first three principal components extracted from the matrix of correlation among ten non-scaled characters accounted for 94.2% of the variation in males and 96.2% of the variation in females. Three-dimensional projections onto principal components of non-scaled characters indicate that animals from eastern populations are larger than animals from western populations. Projections on components I, II, and III of scaled data for males and females and on component I of non-scaled data for both sexes were analyzed with respect to 11 environmental variables. Evapotranspiration and longitude were significantly correlated with morphologic variation in C. puer. Net primary productivity appeared to influence body size in these animals.

Affiliations: 1: Department of Biology, Memphis State University, Memphis, Tennessee 38152, U.S.A.


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