Evolução do sistema reprodutivo de formigas da tribo Attini (Hymenoptera : myrmiciane): análise das espermatecas
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2007-10-04
Autores
Ortiz, Gabriela [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
A espermateca dos insetos estoca os espermatozóides desde a cópula até a fecundação dos ovos, e consiste de uma bolsa que freqüentemente possui glândulas associadas. Considerações sobre a anatomia, histologia e ultra-estrutura de espermatecas tornam-se muito mais complexas quando são considerados os insetos sociais, que apresentam diferenças no tamanho e na forma entre rainhas e operárias, e ainda, entre as espécies. Apesar desta complexidade, os resultados morfológicos, histoquímicos e ultra-estruturais aqui obtidos mostraram as diferenças entre as espermatecas das espécies: Atta sexdens rubropilosa, Atta laevigata, Atta sexdens sexdens, Atta sexdens piriventris, Atta capiguara, Acromyrmex balzani, Acromyrmex landolti, Acromyrmex landolti balzani, Acromyrmex coronatus e Cyphomyrmex muelleri. As espécies Atta sexdens rubropilosa, Atta laevigata, Acromyrmex coronatus e Cyphomyrmex muelleri apresentaram apenas a glândula espermatecal (porção secretora externa à espermateca). Atta sexdens sexdens, Atta capiguara e Acromyrmex landolti balzani apresentaram tanto a glândula espermatecal como um epitélio secretor interno. Atta sexdens piriventris, Acromyrmex balzani e Acromyrmex landolti, no entanto, apresentaram apenas epitélio secretor interno, sugerindo que nestas espécies a espermateca seja mais independente na manutenção dos espermatozóides. As formigas cortadeiras vêm sendo cada vez mais estudadas do ponto de vista filogenético, tendo como principal marcador o DNA mitocondrial. Estabelecer a filogenia das formigas atines auxiliaria na resposta de algumas questões evolutivas sobre a relação destas com seus fungos. Realizou-se aqui a correlação das informações obtidas através das seqüências de DNA e do estudo morfológico das espermatecas de rainhas Atta sexdens rubropilosa, Atta laevigata, Atta sexdens sexdens, Atta sexdens piriventris...
The insects spermatheca stores the spermatozoa from the copulation until the egg fecundation, and consists of a sac frequently associated with glands. Considerations about anatomy, histology and ultrastructure of spermathecae become much more complex in social insects, because they have queens and workers with different sizes and shapes, as well as among the species. Besides this complexity, the morphological, histochemical and ultrastructural results show the differences between the spermathecae of the following species: Atta sexdens rubropilosa, Atta laevigata, Atta sexdens sexdens, Atta sexdens piriventris, Atta capiguara, Acromyrmex balzani, Acromyrmex landolti, Acromyrmex landolti balzani, Acromyrmex coronatus and Cyphomyrmex muelleri. The species Atta sexdens rubropilosa, Atta laevigata, Acromyrmex coronatus and Cyphomyrmex muelleri presented only the spermathecal gland (external secretory portion). Atta sexdens sexdens, Atta capiguara and Acromyrmex landolti balzani presented both the spermathecal gland and an internal secretory epithelium. Atta sexdens piriventris, Acromyrmex balzani and Acromyrmex landolti, however, presented only the internal secretory epithelium, suggesting that the spermatheca in these species is more independent in spermatozoa maintenance. The leaf-cutter ants are being studied more from a phylogenetic point of view, having as a principal marker mitochondrial DNA. The establishment of the phylogeny of the attines ants would help in the response of some evolutionary questions about their relation with their fungus. The present study correlated the information obtained from the DNA sequences and morphological studies of spermathecae of Atta sexdens rubropilosa, Atta laevigata, Atta sexdens sexdens, Atta sexdens piriventris, Atta capiguara, Acromyrmex balzani, Acromyrmex landolti, Cyphomyrmex muelleri, Apterostigma sp. and Mycocepurus goeldii queens... (Complete abstract click electronic access below)
The insects spermatheca stores the spermatozoa from the copulation until the egg fecundation, and consists of a sac frequently associated with glands. Considerations about anatomy, histology and ultrastructure of spermathecae become much more complex in social insects, because they have queens and workers with different sizes and shapes, as well as among the species. Besides this complexity, the morphological, histochemical and ultrastructural results show the differences between the spermathecae of the following species: Atta sexdens rubropilosa, Atta laevigata, Atta sexdens sexdens, Atta sexdens piriventris, Atta capiguara, Acromyrmex balzani, Acromyrmex landolti, Acromyrmex landolti balzani, Acromyrmex coronatus and Cyphomyrmex muelleri. The species Atta sexdens rubropilosa, Atta laevigata, Acromyrmex coronatus and Cyphomyrmex muelleri presented only the spermathecal gland (external secretory portion). Atta sexdens sexdens, Atta capiguara and Acromyrmex landolti balzani presented both the spermathecal gland and an internal secretory epithelium. Atta sexdens piriventris, Acromyrmex balzani and Acromyrmex landolti, however, presented only the internal secretory epithelium, suggesting that the spermatheca in these species is more independent in spermatozoa maintenance. The leaf-cutter ants are being studied more from a phylogenetic point of view, having as a principal marker mitochondrial DNA. The establishment of the phylogeny of the attines ants would help in the response of some evolutionary questions about their relation with their fungus. The present study correlated the information obtained from the DNA sequences and morphological studies of spermathecae of Atta sexdens rubropilosa, Atta laevigata, Atta sexdens sexdens, Atta sexdens piriventris, Atta capiguara, Acromyrmex balzani, Acromyrmex landolti, Cyphomyrmex muelleri, Apterostigma sp. and Mycocepurus goeldii queens... (Complete abstract click electronic access below)
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Formiga, Histologia, Histoquimica, Glandulas, Biologia molecular, Glândula espermatecal, Glands, Ant
Como citar
ORTIZ, Gabriela. Evolução do sistema reprodutivo de formigas da tribo Attini (Hymenoptera : myrmiciane): análise das espermatecas. 2007. 130 f. Tese (doutorado) - Universidade Estadual Paulista, Instituto de Biociências de Rio Claro, 2007.