Patterns of intraspecific variation in the size of ventral wing spots were examined among populations of Speyeria idalia Drury. All morphological variables were significantly correlated with longitude but not latitude. Principal components and discriminant function analyses of the morphological data were also consistent with a longitudinal, clinal pattern of variation. Geographic variation in morphology was concordant with patterns of mitochondrial DNA, which showed fixed differences between eastern and western populations. Inclusion of samples from populations that are currently extinct in the center of the species’ range suggests clinal, rather than the currently observed discrete, variation was originally present. The appearance of discrete variation due to extinction in the center of a cline has previously been observed in the tiger beetle Cicindela dorsalis Say and may be more common than has previously been acknowledged. These results lend support the idea that conservation should attempt to preserve historical patterns of intraspecific variation rather than protect a limited number of individuals in a given species.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.
Vol. 94 • No. 2