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Distribution of
Chironomidae larvae fauna (Insecta: Diptera)
on different substrates in a stream at Floresta da Tijuca, RJ, Brazil
HENRIQUES-OLIVEIRA1
, 3, A.L., DORVILLÉ1
, 2, L.F.M. & NESSIMIAN1,
J.L.
1
Universidade Federal do Rio de Janeiro, Laboratório de Entomologia,
Departamento de Zoologia, Instituto de Biologia, Ilha do Fundão, Cidade
Universitária, Caixa Postal 68044, CEP: 21944-970, Rio de Janeiro, RJ.
2
Faculdade de Formação de Professores –Universidade Estadual do Rio de
Janeiro, Rua Francisco Portela, 794, Paraíso, CEP 24435-000, São
Gonçalo, RJ.
3
e-mail:
anahenri@biologia.ufrj.br
ABSTRACT:
In a
study conducted between 1994 and 1995 in the Rio da Fazenda, Parque
Nacional da Tijuca (Tijuca National Park),
Rio de Janeiro, Brazil, five samples were taken each season from each of
the following substrates found in the area: litter from pools, litter
from riffles, sand, and stones. All samples were taken with the aid of a
Surber sampler. A total of 7,395 chironomid larvae were collected,
distributed in 46 taxa belonging to three subfamilies. Regarding the
substrates, litter from riffles present the highest amount of specimens
although litter from pools exhibited the highest values of diversity and
evenness. According to a correspondence analysis the three major factors
acting upon the chironomid fauna distribution were current flow
(distinguishing erosional from depositional areas),
amount of organic matter available in the substrate, and the rainfall
regime.
Key-words:
Chironomid larvae; spatial distribution; aquatic insects; Tijuca Forest. |
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