Sazonalidade e as redes de interações planta-polinizador
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Data
2011-08-31
Autores
Genini, Julieta [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
Os padrões de floração no nível de comunidade podem afetar a dinâmica dos sistemas ecológicos. Dessa formam a caracterização dos modos de polinização e padrões de floração no nível de comunidade são fundamentais para entender a variação sazonal das flores, polinizadores e sua organização temporal nas diferentes vegetações. Portanto, nos examinamos a floração no nível de comunidade e procuramos identificar padrões agregados, segregados e temporalmente aninhados na Reserva Municipal de Santa Genebra (SGR), uma floresta semidecídua do Sudeste de Brasil. Depois, nós avaliamos os padrões de floração, a diversidade e organização temporal por modos de polinização em SGR. Posteriormente, nos concentramos na dinâmica temporal de uma pequena rede de visitantes florais. Finalmente, estudamos outras dois redes de visitantes florais e avaliamos como diferentes tipos de enlaces (i.e. pilhadores e polinizadores efetivos) afetam a estrutura das redes. Nós encontramos que os padrões de floração em SGR são agregados e aninhados, e identificamos as causas do aninhamento temporal quando removemos as espécies de floração longa. Alem do mais, a SGR apresentou uma alta diversidade de modos de polinização, comparável a outras florestas tropicais, e essa diversidade encontra se representada ao longo das diferentes estações desde que o clima e a filogenia não restringiram a floração da maior parte das espécies. Nos encontramos uma alta dinâmica temporal na nossa pequena rede de visitantes florais junto a um importante componente especial de algumas interações. Por ultimo, a remoção...
Flowering patterns are likely to affect ecological dynamics of plant communities. In that sense, characterization of pollination modes and its flowering patterns at a community level are fundamental to understand the seasonal variation of flowers, pollinators and their temporal organization in different vegetations. Therefore, we examine the flowering patterns at a community level and explored aggregation, segregation and temporal nestedness at the Santa Genebra Reserve, (SGR), a semideciduous forest of Southeastern Brazil. Then, we also evaluate the flowering patterns, diversity and temporal organization of pollination modes within the SGR. Subsequently, we focus on the temporal dynamic of a small sphyngophylous flower visitation network. At last, we studied two other flower visitation networks – Malpighiaceae and Bignoniaceae - and evaluated how different types of links (i.e. cheaters and effective pollinators) influence network topology. We found that the flowering pattern of the SGR community is aggregated and nested. We also identified the causes of nestedness in this community by removing the long-lasting flowering plants. In addition, SGR forest present a high diversity of pollination modes, comparable to other tropical systems, and this diversity is represented across the seasons, since climate and phylogeny did not restrict the flowering of most plants regardless the pollination mode. We also find a high temporal dynamic in our small visitation network as well as a spatial component of some links. Finally, the removal of a particular type of links (cheaters) in one of the visitation networks (Bignoniaceae) completely changed the structure of the network. To conclude, even when the community... (Complete abstract click electronic access below)
Flowering patterns are likely to affect ecological dynamics of plant communities. In that sense, characterization of pollination modes and its flowering patterns at a community level are fundamental to understand the seasonal variation of flowers, pollinators and their temporal organization in different vegetations. Therefore, we examine the flowering patterns at a community level and explored aggregation, segregation and temporal nestedness at the Santa Genebra Reserve, (SGR), a semideciduous forest of Southeastern Brazil. Then, we also evaluate the flowering patterns, diversity and temporal organization of pollination modes within the SGR. Subsequently, we focus on the temporal dynamic of a small sphyngophylous flower visitation network. At last, we studied two other flower visitation networks – Malpighiaceae and Bignoniaceae - and evaluated how different types of links (i.e. cheaters and effective pollinators) influence network topology. We found that the flowering pattern of the SGR community is aggregated and nested. We also identified the causes of nestedness in this community by removing the long-lasting flowering plants. In addition, SGR forest present a high diversity of pollination modes, comparable to other tropical systems, and this diversity is represented across the seasons, since climate and phylogeny did not restrict the flowering of most plants regardless the pollination mode. We also find a high temporal dynamic in our small visitation network as well as a spatial component of some links. Finally, the removal of a particular type of links (cheaters) in one of the visitation networks (Bignoniaceae) completely changed the structure of the network. To conclude, even when the community... (Complete abstract click electronic access below)
Descrição
Palavras-chave
Ecologia vegetal, Floração, Sazonalidade, Seasonality
Como citar
GENINI, Julieta. Sazonalidade e as redes de interações planta-polinizador. 2011. 134 f. Tese - (doutorado) - Universidade Estadual Paulista, Instituto de Biociências de Rio Claro, 2011.