| Autor: |
Rossa DC; PEA, Núcleo de Pesquisas em Limnologia, Ictiologia e Aqüicultura, DBI, Universidade Estadual de Maringá, CEP 87020-900, Maringá, PR, Brazil., Lansac-Tôha FA, Bonecker CC, Velho LF |
| Jazyk: |
English; Portuguese |
| Zdroj: |
Brazilian journal of biology = Revista brasleira de biologia [Braz J Biol] 2001 Feb; Vol. 61 (1), pp. 45-53. |
| DOI: |
10.1590/s0034-71082001000100007 |
| Abstrakt: |
The abundance of cladocerans recorded in plankton samples from the littoral regions of two environments (Baía River and Guaraná lake), the Upper Paraná River floodplain and some limnological variables important in controlling their abundance were investigated at three sites in the lake and two in the river, from March/93 to January/94. Abundance was highest in the lake, chiefly during high water. Bosminidae dominated in both environments and hydrological periods (high and low water). Chydoridae were more important in the lake, and Sididae in the river. A higher number of Pearson's correlations significative (p < 0.03) between the densities of the ten most important species and the limnological variables was observed in the river. This suggests that limnological variables are more important in controlling the abundance of cladocerans in the river. On the other hand, in the lake their abundance was probably associated with the physical structure of the environment, the abundance of aquatic macrophytes, and biotic relationships such as competition and predation. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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