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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Mirmecomorfismo em alguns hemipteros e aranhas

Oliveira, Paulo Sergio Moreira Carvalho de, 1957- 28 June 1982 (has links)
Orientador: Woodruff W. Benson / Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Biologia / Made available in DSpace on 2018-07-16T08:50:42Z (GMT). No. of bitstreams: 1 Oliveira_PauloSergioMoreiraCarvalhode_M.pdf: 10502578 bytes, checksum: 74d526100ba3f66565c8d1de52cc8378 (MD5) Previous issue date: 1982 / Resumo: Foram estudados alguns hemípteros Alydidae (ninfas de Hyalymenus) e aranhas (Salticidae, Clubionidae e Aphantochilidae) mirmecomórficos do norte e sudeste brasileiros.As ninfas de Hyalymenus mimetizam espécies de formigas de diferentes cores e tamanhos de acordo com seus estadios. As adaptações morfológicas mais importantes,para o mimetismo de formigas, nas ninfas de H.limbativentis e H. tarsatus,são (1) região cervical e "cintura" finas; (2)corpo, patas e antenas estreitos; (3) abdome globoso e constricto anteriormente e (4) tegumento brilhante e piloso. O deslocamento rápido em ¿zigue-zague¿, a constante agitação das antenas e o comportamento de elevar e abaixar o abdome são as semelhanças mais evidentes entre as ninfas destes hemípteros e seus modelos. As ninfas miméticas foram observadas tanto de dia como à noite alimentando-se, junto com formigas, sobre frutos de algumas plantas. Hyalymenus adultos, que possuem a morfologia típica de hemípteros, são encontrados alimentando- se nas plantas principalmente à noite, e foram atacados por Camponotus spp. em cativeiro. Por outro lado, as ninfas miméticas foram atacadas por estas formigas tanto em cativeiro como no campo. Experimentos em laboratório mostra ram,que as ninfas miméticas gozam de uma certa proteção contra ataques de insetos predadores, como mantídeos e reduviídeos. ...Observação: O resumo, na íntegra, poderá ser visualizado no texto completo da tese digital / Abstract: Some myrmecomorphic Alydidae hemipterans (nymphs of Hyalymenus) and spiders (Salticidae, Ciubionidae and Aphantochilidae) from north and southeast Brazil were studied. Nymphs of Hyalymenus mimic ant species of different colors and sizes according to their instars. The main morphological adaptations for ant-mimicry in nymphs of H. limbativentris and H. tarsatus are the following: (1) cervical region and waist are narrow; (2) thin body, legs and antennae; (3) globose and anteriorly constricted abdomen; (4) shiny and pilose integurnent. The rapid ¿zig-zag¿" locomotion, the constantly agitating antennae and the behavior of rnoving up and down the abdomen are the most evident resemblances between mimetic nymphs and their models. Mimetic nymphs were observed both day and night feeding on fruits of some plants in the company of ants. Adult Hyalymenus, which have the typical hemipteran morphology, are found mainly at night feeding on plants, and were attacked by Camponotus spp. under captivity. However, mimetic nymphs were not attacked by these ants both under captivity and in the field. Laboratory experiments showed that mimetic nymphs gain some protection against attacks of predatory insects such as mantids and reduviids. On the other hand, adult Hyalymenus were attacked by these predators under the same conditions. ...Note: The complete abstract is available with the full electronic digital thesis or dissertations / Mestrado / Ecologia / Mestre em Ciências Biológicas

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