Ecologia de insetos aquáticos em córregos do Cerrado: do nicho hutchinsoniano ao distúrbio intermediário
Carregando...
Data
2010-06-18
Autores
Título da Revista
ISSN da Revista
Título de Volume
Editor
Universidade Federal de Goiás
Resumo
The Cerrado region is the second largest biome in Brazil, covering nearly 22%
of the national territory. Due to a facility provided this biome for handling and
cultivating the soil, the Cerrado has been suffering an intense change in its landscape,
increasing the impact in all it s natural systems. Thru a systemized sampling of 101
streams in the Rio das Almas River Basin region, center of Goias, it was observed how
such change in landscape changes the community of benthonic water insects. Initially it
was not observed changes in the number of genres for different river sizes. Impact raise,
especially in the riparian zone leads to a reduction in the number of genres of
Ephemeroptera, Plecoptera and Trichoptera. The communities in impacted streams are
subsets of communities in pristine localities, showed a nestedness pattern. Despite the
number of genres reduction in impacted locations, the expected richness expressed by
the sum of the probability of genre occurrence in certain integrity value, is larger in
preserved and degraded locations. Therefore, the genre substitution rate tends to be
larger in very impacted and well preserved areas. The environmental matrix of the
Cerrado is composed largely of already impacted areas, which explains this large
number or genres that live in degraded locations thru simple area effect. Ultimately, we
compared the results of two indexes used for ecological monitoring proposes of streams,
that aim to observe different impacts in the environment. There was no relation between
the Index of Habitat Integrity and an index that measures the pollution in the water
(BMPW ), indicating that there is a need to use the two together for an effective
monitoring.
Descrição
Palavras-chave
Citação
GODOY, Bruno Spacek. Cerrado stream insect quatic ecology: from Hutchinsoniano to intermediary disturbance. 2010. 119 f. Tese (Doutorado em Ciencias Biologicas) - Universidade Federal de Goiás, Goiânia, 2010.