Riqueza e composição de mariposas Arctiinae (Lepidoptera, Noctuidae) em diferentes formações vegetais em uma área de cerrado
Nenhuma Miniatura disponível
Data
2012-05-17
Autores
Título da Revista
ISSN da Revista
Título de Volume
Editor
Universidade Federal de Goiás
Resumo
The Cerrado Biome presents a mosaic of vegetation ranging from open areas
with no shrub component (grassland) to areas with a high density of tall trees (forests
formations). This mosaic of vegetation that occurs in the Cerrado harbors a high
biodiversity of different groups of animals and enables to this biome presents high beta
diversity in the region. However, data of species occurrence are lacking for most groups
of animals, especially for the invertebrates. In this work, Arctiinae moths were sampled
in different vegetation formations of the Cerrado. Arctiinae are one of the richest
subfamilies of Lepidoptera. About 11.000 species were described in worldwide, 6.000
in the Neotropics, 1.400 in Brazil and 720 in the Cerrado. Most larvae of Arctiinae are
polyphagous. In addition to eating the green angiosperm and gymnosperm tissues, their
ranks include species that consume algae, lichens, liverworts and mosses. Despite being
polyphagous, the most species of Arctiinae feed mainly on the plant species that provide
secondary metabolities (mainly pyrrolizidine alkaloids) that offer to them chemical
protection against natural enemies. Thus, variations in the host plant species
composition reflect at least partially in the variations in the moths species composition.
In the first chapter of this dissertation, the Arctiinae moth fauna was characterized in
four vegetation formations (dirty grassland, closed grassland, cerrado sensu stricto and
semideciduous forest). Moths species richness was significantly higher in vegetation
formations more structurally complex. The moth species composition in semideciduous
forest was significantly dissimilar from the others vegetation formations. There was a
positive correlation between the moths similarity patterns and the plants similarity
patterns. In the first chapter was also tested the premise that structurally simple habitats
presents a higher intensity of predation because they available less quantity of refuges
for prey. This premise was corroborated because the predation intensity on artificial
caterpillars was twice higher in the dirty grassland than in the structurally complex
vegetation. In the second chapter of this dissertation was tested which environmental
variable best determines the variation in Arctiinae species richness and composition
between the vegetation formations of the cerrado sensu lato (dirty grassland, closed
grassland and cerrado sensu stricto). The trees richness was the most determinant of
moths species richness. The moth species composition was influenced by the trees
richness, followed by herbs density, predation intensity and by the variation coefficient
3
of tree height. The results that the vegetation characteristics are the best predictors of
the variations in the moths species richness and composition indicate that it is necessary
to invest in conservation measures of all vegetation formations that occurs in the
Cerrado.
Descrição
Palavras-chave
Citação
MORENO, C. Riqueza e composição de mariposas Arctiinae (Lepidoptera, Noctuidae) em diferentes formações vegetais em uma área de cerrado. 2012. 99 f. Dissertação (Mestrado em Ecologia e Evolução) - Universidade Federal de Goiás, Goiânia, 2012.