Rossa D C, Lansac-Tôha F A, Bonecker C C, Velho L F
PEA, Núcleo de Pesquisas em Limnologia, Ictiologia e Aqüicultura, DBI, Universidade Estadual de Maringá, CEP 87020-900, Maringá, PR, Brazil.
Braz J Biol. 2001 Feb;61(1):45-53. doi: 10.1590/s0034-71082001000100007.
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.
1993年3月至1994年1月期间，在巴拉那河上游洪泛区的两个环境（巴伊亚河和瓜拉纳湖）的沿岸地区的浮游生物样本中记录的枝角类动物的丰度，以及在控制其丰度方面重要的一些湖泊学变量，在湖泊的三个地点和河流的两个地点进行了调查。丰度在湖泊中最高，主要在高水位期间。薄皮溞科在两种环境和水文时期（高水位和低水位）中占主导地位。盘肠溞科在湖泊中更重要，而仙达溞科在河流中更重要。在河流中观察到十个最重要物种的密度与湖泊学变量之间有更多显著的皮尔逊相关性（p < 0.03）。这表明湖泊学变量在控制河流中枝角类动物的丰度方面更重要。另一方面，在湖泊中，它们的丰度可能与环境的物理结构、水生大型植物的丰度以及竞争和捕食等生物关系有关。
