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Identifying female phenotypes that promote behavioral isolation in a sexually dimorphic species of fish etheostoma zonale

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Current Zoology 2021年第2期67卷 225-236页

作者： Natalie S.ROBERTS Tamra C.MENDELSON Department of Biological Sciences University of Maryland Baltimore CountyBaltimoreMD21250USA

In sexually dimorphic species characterized by exaggerated male ornamentation,behavioral isola-tion is often attributed to female preferences for conspecific male ***,in a number of sexu-ally dimorphic species,male mate choice also results in behavioral *** many of these cases,the female traits that mediate species boundaries are *** in sexually dimorphic species typically lack many of the elaborate traits that are present in males and that are often used for taxonomic classification of *** a diverse and largely sexually dimorphic group of fishes called darters(Percidae:etheostoma),male mate choice contributes to behavioral isolation be-tween a number of species;however,studies addressing which female traits males prefer are *** this study,we identified the dominant female pattern for two sympatric species,etheostoma zonale and etheostoma barrenense,using pattern energy analysis,and we used discriminate func-tion analysis to identify which aspects of female patterning can reliably classify *** then tested the role of female features in male mate choice for ***,by measuring male preference for computer animations displaying the identified(species specific)conspecific *** found that the region above the lateral line is important in mediating male mate preferences,with males spending a significantly greater proportion of time with animations exhibiting conspecific female patterning in this region than with animations exhibiting heterospecific female *** results suggest that the aspects of female phenotypes that are the target of male mate choice are different from the conspicuous male phenotypes that traditionally characterize species.

关键词： darters discriminant function analysis etheostoma female phenotype male mate choice 3D animations

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The evolution of multi-component visual signals in darters （genus etheostoma）

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Current Zoology 2011年第2期57卷 125-139页

作者： Jennifer M. GUMM Tamra C. MENDELSON Department of Biological Sciences University of Maryland Baltimore County 1000 Hilltop Circle Baltimore MD 21250 USA

As complex traits evolve, each component of the trait may be under different selection pressures and could respond independently to distinct evolutionary forces. We used comparative methods to examine patterns of evolution in multiple components of a complex courtship signal in darters, specifically addressing the question of how nuptial coloration evolves across different areas of the body. Using spectral reflectance, we defined 4 broad color classes present on the body and fins of 17 species of freshwater fishes （genus etheostoma） and quantified differences in hue within each color class. Ancestral state reconstruction suggests that most color traits were expressed in the most recent common ancestor of sampled species and that differences among species are mostly due to losses in coloration. The evolutionary lability of coloration varied across body regions; we found sig- nificant phylogenetic signal for orange color on the body but not for most colors on fins. Finally, patterns of color evolution and hue Of the colors were correlated among the two dorsal fins and between the anterior dorsal and anal fins, but not between any of the fins and the body. The observed patterns support the hypothesis that different components of complex signals may be subject to distinct evolutionary pressures, and suggests that the combination of behavioral displays and morphology in communication may have a strong influence on patterns of signal evolution .

关键词： Comparative method etheostoma Independent evolution Nuptial coloration

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