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Growth-pattern variation in two species of Rheumatobates (Heteroptera: Gerridae) with different degrees of sexual dimorphism

Published online by Cambridge University Press:  02 April 2012

M.S. Iglesias  and
F.A. Crespo
M.S. Iglesias*
Affiliation:
Departamento de Biodiversidad y Biología Experimental, Facultad de Ciencias Exactas y Naturales Universidad de Buenos Aires, 4° piso Pabellón II, Ciudad Universitaria (C1428EHA), Buenos Aires, Argentina
F.A. Crespo
Affiliation:
Departamento Vectores, Administración Nacional de Laboratorios e Institutos de Salud “Dr. Carlos G. Malbrán”, Vélez Sarsfield 563 (C1281AFF), Buenos Aires, Argentina
*
1Corresponding author (e-mail: iglesias@bg.fcen.uba.ar).
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Abstract

Growth patterns of Rheumatobates crassifemur crassifemur Esaki and R. bonariensis (Berg) were compared in a multivariate framework. Study of allometric coefficients in R. bonariensis showed sexual differences biased towards males in antennal and foreleg segments and biased towards females in body length and middle-leg segments. Multivariate allometric analysis of female growth patterns detected variation among species in those characters that are strongly modified in males of R. c. crassifemur. We show that sexual morphology diverges as of nymph V in R. c. crassifemur but only in the adults of R. bonariensis.

Résumé

On a comparé les taux de croissance de Rheumatobates crassifemur crassifemur Esaki et R. bonariensis (Berg) dans un cadre théorique multivarié. L’étude des coefficients allométriques en R. bonariensis montre des différences sexuelles biaisées vers les mâles dans les segments d’antennes et pattes antérieures, par contre le biais est vers les femelles en ce qui concerne la longueur du corps et les segments de la patte moyenne. Les patrons de croissance des femelles étudiés avec l’analyse allométrique multivariée montrent des différences entre espèces dans les caractères fortement modifiés chez les mâles de R. c. crassifemur. On a révélé que la morphologie sexuelle diverge dès la nymphe V en R. c. crassifemur et seulement en adultes de R. bonariensis.

Type
Articles
Information
The Canadian Entomologist , Volume 140 , Issue 3 , June 2008 , pp. 380 - 384
Copyright
Copyright © Entomological Society of Canada 2008

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