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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

Visitantes florais e efici?ncia de poliniza??o em Jacquemontia bracteosa Meisn (Convolvulaceae) em uma ?rea no Semi?rido brasileiro

Santos, Silvia Karla Dias dos 18 April 2013 (has links)
Submitted by Ricardo Cedraz Duque Moliterno (ricardo.moliterno@uefs.br) on 2016-02-29T22:35:01Z No. of bitstreams: 1 Disserta?ao Silvia.pdf: 886694 bytes, checksum: 049402a0d6acf81a0e49439f59de35f9 (MD5) / Made available in DSpace on 2016-02-29T22:35:01Z (GMT). No. of bitstreams: 1 Disserta?ao Silvia.pdf: 886694 bytes, checksum: 049402a0d6acf81a0e49439f59de35f9 (MD5) Previous issue date: 2013-04-18 / Convolvulaceae flowers are characterized mainly by being beautiful and ephemeral, attracting many visitor flowers that belong to different taxonomic groups. They are often found in open environments acting as an important food resource to flower visitors especially bees. This work aimed to investigate the interactions between insects and flowers of Jacquemontia bracteosa Meisn visitors (Convolvulaceae) identifying the pollinator potentials in a semi-arid area in the Northeast. The study was carried out from November 2011 to October 2012, when the morphology and floral biology and reproductive biology of J. bracteosa and floral visitors. The J. bracteosa flowers opened early morning and lasted less than 12 hours, being considered ephemeral. These were self-compatible breeding system, with fruiting by selfing and outcrossing. The flowers were visited mainly by Apidae family bees (females and males of Ancyloscelis apiformis, Ceratina aff maculifrons and Trigona spinipes) and family Halictidae (Augochlora spp). Other visitors were collected from flowers with its frequency below 1%. Among the floral visitors A. apiformis was considered the most efficient pollinator for showing behavior, frequency, and constancy on the flowers. Furthermore, these bees arrived soon when the flowers began to open and presented 90% of efficiency in tests with three visited flowers of J. bracteosa. Other bees as T. spinipes, Ceratina aff maculifrons, Exomalopsis analis, Exomalopsis sp1, and Pseudaugochlora sp1 may be considered potential pollinators because they present behavior and morphology compatible with the flowers. / Flores de Convolvulaceae s?o caracterizadas principalmente por serem ef?meras e vistosas, atraindo muitos visitantes florais pertencentes a grupos taxon?micos diferentes. S?o frequentemente encontradas em ambientes abertos atuando como importante fonte de recursos alimentares aos visitantes florais especialmente abelhas. O presente trabalho teve como objetivo estudar as intera??es entre os insetos visitantes e Jacquemontia bracteosa Meisn. (Convolvulaceae), identificando os potenciais polinizadores em uma ?rea no semi-?rido do Nordeste do Brasil. O estudo foi realizado de novembro de 2011 a outubro de 2012, e foram analisados aspectos da morfologia e biologia floral e biologia reprodutiva de J. bracteosa e dos visitantes florais. As flores de J. bracteosa abriam entre 5:10 e 6:20 e duravam menos de 12 horas, sendo consideradas ef?meras. Estas apresentavam sistema reprodutivo autocompat?vel, com frutifica??o por poliniza??o cruzada e autopoliniza??o. As flores foram visitadas principalmente por abelhas das fam?lias Apidae (f?meas e machos de Ancyloscelis apiformis, Ceratina aff maculifrons, Exomalopsis analis, Exomalopsis sp1 e Trigona spinipes) e Halictidae (Augochlora spp). Outros visitantes foram coletados nas flores apresentando frequ?ncia abaixo de 1%. Dentre os visitantes florais A. apiformis foi considerada o polinizador mais eficiente por apresentar comportamento compat?vel com a poliniza??o na esp?cie, frequ?ncia alta de visitas e const?ncia nas flores. Al?m disso, estas abelhas chegavam logo quando a flor come?ava a abrir e apresentaram 90% de efici?ncia nos testes realizados com tr?s visitas nas flores de J. bracteosa. Outras abelhas como T. spinipes, Ceratina aff maculifrons, Exomalopsis analis, Exomalopsis sp1 e Pseudaugochlora sp1 podem ser consideradas polinizadores potenciais, pois apresentam comportamento e morfologia compat?veis com a poliniza??o das flores.

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