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Chromosomal Polymorphism, Morphometric Traits and Mating Success in Leptysma argentina Bruner (Orthoptera)

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Abstract

The South-American species Leptysma argentina Bruner is polymorphic for a centric fusion between chromosomal pairs 3 and 6 (fusion 3/6). Cytogenetic and morphological studies revealed that fusion 3/6 significantly increases some morphometric variables in males. A selection components study showed that the fusion is positively selected for longevity, the direct effect being exerted on thorax height. Moreover, a unisexual approach revealed that sexual male selection acts by increasing third femur length. In the present study the effect of fusion 3/6 on morphometric variables and the effect of body size and karyotype on mating success in both males and females were analysed through a bisexual approach. Total body length (TL) and third femur length (FL) were significantly larger amongst the fusion carrier females. Besides, the largest females and the carriers of the fusion have increased mating success. The selection differential suggests that directional sexual selection favours the females with increased TL and fusion dosage; however, the selection gradient revealed that none of the variables here analysed is a direct target of sexual selection. The male sexual selection study agrees with previous results, showing the importance of the third pair of legs in male mating success among grasshoppers.

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Authors and Affiliations

  1. Depto. Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, 1428 Ciudad Universitaria, Buenos Aires, Argentina

    P.C. Colombo (Member of Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), S. Pensel (Fellow of Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) & R.M. Isabel

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  1. P.C. Colombo
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  2. S. Pensel
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  3. R.M. Isabel
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Colombo, P., Pensel, S. & Isabel, R. Chromosomal Polymorphism, Morphometric Traits and Mating Success in Leptysma argentina Bruner (Orthoptera). Genetica 121, 25–31 (2004). https://doi.org/10.1023/B:GENE.0000019924.96257.97

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