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Master's Dissertation
DOI
10.11606/D.59.2010.tde-23042010-161204
Document
Author
Full name
Rhainer Guillermo Nascimento Ferreira
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
Ribeirão Preto, 2010
Supervisor
Committee
Claro, Kleber Del (President)
Nascimento, Fabio Santos do
Santos, Jean Carlos
Title in Portuguese
Seleção sexual e sua relação com o dimorfismo sexual em três espécies de Zygoptera (Odonata) no Sudeste do Brasil
Keywords in Portuguese
Dimorfismo sexual
Odonata
sistemas reprodutivos
territorialidade
Abstract in Portuguese
O dimorfismo sexual nas espécies pode surgir a partir da seleção decorrente dos diferentes sistemas reprodutivos. Estudos comportamentais de espécies neotropicais são raros e pouco se sabe sobe as espécies brasileiras. Neste estudo, foram descritos o comportamento de três espécies neotropicais que ocorrem no Cerrado brasileiro: Acanthagrion truncatum, Argia reclusa (Coenagrionidae) e Heaterina rosea (Calopterygidae). Também foi evidenciado o dimorfismo sexual nestas espécies e investigou-se a partir de observações comportamentais, como o dimorfismo se desenvolve em espécies com diferentes táticas reprodutivas. Com os resultados obtidos, vemos que em espécies territoriais os machos são maiores do que as fêmeas, enquanto em espécies não-territoriais as fêmeas são maiores do que os machos. Sugere-se que, diferentemente de outros estudos, em Zygoptera o tipo de sistema reprodutivo pode determinar o dimorfismo sexual.
Title in English
Sexual selection and sexual size dimorphism in three Zygoptera (Odonata) species of the southeastern Brazil.
Keywords in English
mating systems
Odonata
Sexual size dimorphism
territoriality
Abstract in English
Sexual size dimorphism (SSD) can in some species result from the selection acting through different mating systems. Behavioral studies of neotropical species are rare, and few is known about the brazilian species. In this study, we described the behavior of three neotropical species that occur in the brazilian neotropical savannah: Acanthagrion truncatum, Argia reclusa (Coenagrionidae) and Heaterina rosea (Calopterygidae). We show the SSD in these species and investigates through behavioral observations, how SSD develops in species with different mating tactics. With our results, we can see that in territorial species the males are larger than females, while in non-territorial species the females are larger than males. We suggest that, unlike other studies, in Zygoptera the kind of mating system adopted by males may determinate the SSD in a species.
 
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Publishing Date
2010-08-19
 
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