Data from: In love and war: the morphometric and phylogenetic basis of ornamentation, and the evolution of male display behavior, in the livebearer genus Poecilia
Data files
Dec 26, 2018 version files 487.09 KB
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Allopoecilia caucana.csv
7.68 KB
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Goldberg et al ANCOVA for OI R Code.docx
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Limia caymanensis.csv
5.73 KB
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Limia dominicensis.csv
11.72 KB
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Limia grossidens.csv
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Limia melanogaster.csv
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Limia melanonotata.csv
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Limia nigrofasciata.csv
10.47 KB
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Limia pauciradiata.csv
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Limia perugiae.csv
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Limia rivasi.csv
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Limia sulfurophila.csv
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Limia tridens.csv
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Limia versicolor.csv
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Limia vittata.csv
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Limia zonata.csv
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Pamphorichthys araguaiensis.csv
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Pamphorichthys hasemani.csv
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Pamphorichthys hollandi.csv
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Pamphorichthys minor.csv
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Pamphorichthys scalpridens.csv
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Poecilia butleri.csv
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Poecilia chica.csv
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Poecilia gilli.csv
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Poecilia hondurensis.csv
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Poecilia latipinna.csv
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Poecilia latipunctata.csv
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Poecilia limantouri.csv
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Poecilia mexicana.csv
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Poecilia orri.csv
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Poecilia petenensis.csv
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Poecilia salvatoris.csv
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Poecilia sphenops.csv
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Poecilia sulphuraria.csv
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Poecilia velifera.csv
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Poecilia vivipara.csv
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Pseudolimia heterandria.csv
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Psychropoecilia hispaniolana.csv
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Abstract
Exaggerated male traits under sexual selection are often used for both competition and courtship, raising the question of whether ornaments evolved simultaneously for both functions, or if use in one context preceded use in another. Here we apply a phylogenetic approach to study the evolution of ornamental dorsal fins in male poeciliid fish of the subgenera Mollienesia and Limia, which exhibit convergent development of an enlarged dorsal fin, and often direct erect-fin displays to male and female conspecifics. Unlike prior categorical assessments of poeciliid adornments, we measure dorsal fin exaggeration with a continuous index of ornamentation. Phylogenetic logistic and generalized least-squares regression analyses indicate that high index values are significantly associated with the use of two component postures of courtship and aggressive displays, dorsal fin erection and body curvature, but not with the presence of sexual dichromatism. Male displays initially evolved for male-male aggression in the common ancestor of Mollienesia and Limia, suggesting that this signal originated for competition, then became co-opted for courtship. These results support the armament-ornament hypothesis for evolution of exaggerated male traits, and are consistent with an evolutionary shift in the predominant mechanisms of sexual selection from intra- to intersexual.