Premium
Can members of the south‐western Gila robusta species complex be distinguished by morphological features?
Author(s) -
Moran C. J.,
O'Neill M. W.,
Armbruster J. W.,
Gibb A. C.
Publication year - 2017
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/jfb.13348
Subject(s) - meristics , morphometrics , biology , shape analysis (program analysis) , morphological analysis , zoology , intermedia , morphology (biology) , ecology , evolutionary biology , artificial intelligence , static analysis , art , performance art , computer science , art history
The goal for this project was to re‐examine key morphological characters hypothesized to differentiate Gila intermedia , Gila robusta and Gila nigra and outline methods better suited for making species designations based on morphology. Using a combination of meristic counts, morphological measurements and geometric morphometrics, morphological dissimilarities were quantified among these three putative species. Traditional meristic counts and morphological measurements ( i.e. distances between landmarks) were not useful for species identification. Geometric morphometrics, however, identified differences among species, while also suggesting an effect of geographic location on morphological variation. Using canonical variate analysis for the 441 fish sampled in this study, geometric morphometrics accurately predicted true group membership 100% of the time for G . nigra , 97% of the time for G . intermedia and 91% of the time for G . robusta . These results suggest that geometric morphometric analysis is necessary to identify morphological differences among the three species. Geometric morphometric analysis used in this study can be adopted by management officials as a tool to classify unidentified individuals.