When molecular phylogeography results in the discovery of hidden diversity, this diversity is often labeled as cryptic. Few studies have gone back to the morphology to determine whether or not this molecular diversity is in fact detectable at the morphological level. The Notropis rubellus species complex has a widespread distribution in freshwater streams of eastern North America. Recent molecular studies have identified up to seven allopatric clades, suggesting that there may be morphologically cryptic diversity within the group. This study uses traditional meristics and geometric morphometric methods to test molecular hypotheses of cryptic diversity within the species complex. Meristic data and a principal component analysis of geometric morphometric data supported the cryptic hypothesis. Canonical variates analyses (CVA), however, were able to detect statistically significant, clade-specific morphological variation, suggesting that in this case, cryptic diversity was an artifact of the detection method. CVA thus provided a useful tool for identifying subtle or complex shape variation. However, morphological variation within the N. rubellus species complex was undetectable without a pre-existing molecular hypothesis.
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. 2009 • No. 4