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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.

Registro:

Documento: Artículo
Título:Chromosomal polymorphism, morphometric traits and mating success in Leptysma argentina Bruner (Orthoptera)
Autor:Colombo, P.C.; Pensel, S.; Isabel, R.M.
Filiación:Depto. Ecologia, Genet. y Evol., Fac. de Ciencias Exactas y Naturales, 1428 Ciudad Universitaria, Buenos Aires, Argentina
Consejo Nac. de Invest. Cie. y Tec., Argentina
Palabras clave:Centric fusion; Female mating success; Leptysma argentina; Morphometric variables; Orthoptera; animal; article; body size; chromosome; cross breeding; female; genetic polymorphism; genetic selection; genetics; histology; male; multivariate analysis; Orthoptera; phenotype; sexual behavior; Animals; Body Size; Chromosomes; Crosses, Genetic; Female; Male; Multivariate Analysis; Orthoptera; Phenotype; Polymorphism, Genetic; Selection (Genetics); Sexual Behavior, Animal; Insecta; Leptysma; Orthoptera
Año:2004
Volumen:121
Número:1
Página de inicio:25
Página de fin:31
DOI: http://dx.doi.org/10.1023/B:GENE.0000019924.96257.97
Título revista:Genetica
Título revista abreviado:Genetica
ISSN:00166707
CODEN:GENEA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00166707_v121_n1_p25_Colombo

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Citas:

---------- APA ----------
Colombo, P.C., Pensel, S. & Isabel, R.M. (2004) . Chromosomal polymorphism, morphometric traits and mating success in Leptysma argentina Bruner (Orthoptera). Genetica, 121(1), 25-31.
http://dx.doi.org/10.1023/B:GENE.0000019924.96257.97
---------- CHICAGO ----------
Colombo, P.C., Pensel, S., Isabel, R.M. "Chromosomal polymorphism, morphometric traits and mating success in Leptysma argentina Bruner (Orthoptera)" . Genetica 121, no. 1 (2004) : 25-31.
http://dx.doi.org/10.1023/B:GENE.0000019924.96257.97
---------- MLA ----------
Colombo, P.C., Pensel, S., Isabel, R.M. "Chromosomal polymorphism, morphometric traits and mating success in Leptysma argentina Bruner (Orthoptera)" . Genetica, vol. 121, no. 1, 2004, pp. 25-31.
http://dx.doi.org/10.1023/B:GENE.0000019924.96257.97
---------- VANCOUVER ----------
Colombo, P.C., Pensel, S., Isabel, R.M. Chromosomal polymorphism, morphometric traits and mating success in Leptysma argentina Bruner (Orthoptera). Genetica. 2004;121(1):25-31.
http://dx.doi.org/10.1023/B:GENE.0000019924.96257.97