![]() ![]() External coloration in animals depends on the interaction of several different. obscurus, and suggests intraspecific variation of color in both species may be primarily influenced by other factors. Color variation in signal crayfish Pacifastacus leniusculus.Therefore, this study does not support the presence of ontogenetic color change in C. Examination for relationships between coloration (percent “green dominanceâ€, i.e., the proportion of green in comparison to blue and red in photographs) and body size did not reveal any significant relationship between these variables in either crayfish species. obscurus collected from two locations, respectively, in an eastern Pennsylvania stream. ![]() This work incorporated digital image analysis to quantify coloration of samples of C. However, this hypothesis has never been quantitatively tested. Ortmann (1906) hypothesized that the crayfish Cambarus bartonii bartonii and Faxonius obscurus exhibit an ontogenetic shift in color change, with greener coloration in younger individuals of both species diminishing with age in larger specimens.
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