Ecologia de comunidades de insetos bentônicos (Ephemeroptera, Plecoptera e Trichoptera), em córregos do parque ecológico de Goiânia, Goiás, Brasil

Abstract

ABSTRACT. ECOLOGY DF BENTHIC INSECTS COMMUNITIES (EPHEMEROI'TERA, PLECDP-TERA AND TRICHOPTERA) lN STREAMS AT PARQUE ECOLÓGICO DE GOIANIA, GOLAs, BRAZIL. Relationships among some abiotic factors (temperature, velocity, tlow, conductivity, oxy-reduction potential and pl-l) and the seazonal density ofbenthic insects (immature forms) of lhe orders Ephemeroplera, Plecoplera and Trichoptera at the Parque Ecológico de Goiânia, Goiás are studied. An area of 1m 2 was sampled and abiotic factors were recorded in 4 sites fram August/I994 to July/1995. The faunistic composition was 75% Ephemeraplera, 1% Plecoptera and 24% Trichoplera. The data suggest the water velocity and tlow as lhe 11lain faclors that delennined the aquatic insects abundance.

Changes in the structure of fish assemblages in streams along an undisturbed-impacted gradient, upper Paraná River basin, Central Brazil

“…However, both streams are not entirely free from disturbance. Upstream from the sampled stretch bed channel of the P1 stream runs into an artificial channel (second author personal observation) and the P2 stream suffers interference from the cattle in the headwater region located outside the PEAMP area, and which remove the channel substrate (Oliveira et al, 1997).…”

Estrutura da comunidade de invertebrados bentônicos em dois cursos d'água do Rio Grande do Sul, Brasil

“…O H' variou no período de seca e chuvoso, com valores de 1,00 a 3,58. Os índices mais baixos foram encontrados durante os meses de chuva, devido ao aumento do fluxo nos córregos o que acarreta um grande transporte de organismos rio abaixo (OLIVEIRA et al 1997;BISPO & OLIVEIRA 1998).…”

Influence of environmental variables and anthropogenic perturbations on stream fish assemblages, Upper Paraná River, Central Brazil

“…In addition, the catfish C. cf. iheringi is reported to be invertivorous (Casatti & Castro, 1998;Froese & Pauly, 2008;Oliveira et al, 1997), feeding predominantly on aquatic insect larvae such as those of the family Leptophlebiidae, Hydropsychidae, Hydroptilidae (Casatti & Castro, 1998), which are present in streams of the Upper Paraná River (Oliveira et al, 1997). In the case of the characin P. argentea, its fusiform body, terminal mouth position (Fialho & TejerinaGarro, 2004), small size and opportunistic feeding behavior facilitate its exploitation of different lotic habitats along the margins of water courses (Ferreira & Casatti, 2006b;Ferreira et al, 2002;Gomiero & Braga, 2005).…”