A comunidade de insetos indutores de galhas associados a Baccharis concinna (Asteraceae): o papel da taxa de crescimento de brotos e das variações sazonais

  • Evelyn S. A. Marques Terrestrial and Insect Ecology Laboratory, Department of Biological Sciences, Florida Atlantic University, Boca Raton
  • Geraldo Wilson Fernandes Ecologia Evolutiva & Biodiversidade, Departamento de Biologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais; Department of Biology, Stanford University.

Resumo

Resource allocation patterns have been extensively studied on the dioecious shrub Baccharis concinna Barroso (Asteraceae) in rupestrian grasslands in Brazil. Female plants have longer apical shoots, more flowers per shoot, and greater leaf, flower and stem biomass on apical shoots while male plants have longer lateral shoots. Otherwise, no differences were observed in total biomass of vegetative parts between male and female plants. We further investigated the relationship between lateral shoot growth rates and the richness and abundance of galling-insect species on this host plant. Male plants had longer lateral shoots due to greater growth rates throughout the year. On the other hand, galling-insect richness and abundance did not differ between male and female plants throughout the year. Gall-inducing insects showed greater richness and abundance in the drier months of the year while lateral shoot growth rates were greater during the rainy season. In conclusion, male plants allocated more resources to the growth of lateral shoots when compared to female plants, but this differential growth did not reflect on male plants being more attacked by galling-insects.

Keywords: insect galls, insect herbivory, growth rates, plant dioecy, resource allocation, rupestrian grasslands, Serra do Cipó.

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Publicado
2016-02-01
Seção
Artigos