Bispo P C, Oliveira L G, Bini L M, Sousa K G
Departamento de Ciências Biológicas, FCLA, UNESP, Av. Dom Antônio 2100, CEP 19806-900, Assis, São Paulo, Brazil.
Braz J Biol. 2006 May;66(2B):611-22. doi: 10.1590/s1519-69842006000400005.
The influence of environmental factors on the distribution of Ephemeroptera, Plecoptera and Trichoptera (EPT) immatures was investigated in streams of the Brazilian Center-West (Serra do Pireneus, Pirenópolis, State of Goiás). The insects were sampled by lifting the stones in front of a sieve (0.5 mm mesh) and then removing the insects from both the stone and the sieve. Sampling was carried out for 1 h at 5 collection sites over a period of 14 months. Air and water temperature (degrees C), water velocity (m/s), discharge (m(3)/s), electric conductivity (microS/cm), pH, and rainfall (mm) were also recorded. In general, we may state that altitude, hydrologic classification (order) and vegetation cover were the most important factors explaining the distribution of Ephemeroptera, Plecoptera and Trichoptera immatures. The influence of the rainfall on the temporal variation of the abundance of insects was stronger in stream segments of medium order (3rd, 4th order) compared to smaller streams (first order).
在巴西中西部（戈亚斯州皮雷诺波利斯的皮雷诺厄斯山脉）的溪流中，研究了环境因素对蜉蝣目、襀翅目和毛翅目（EPT）幼虫分布的影响。通过提起筛子（0.5毫米筛孔）前的石块，然后从石块和筛子上采集昆虫进行采样。在14个月的时间里，在5个采集地点进行了1小时的采样。还记录了气温和水温（摄氏度）、水流速度（米/秒）、流量（立方米/秒）、电导率（微西门子/厘米）、pH值和降雨量（毫米）。总体而言，可以说海拔、水文分类（等级）和植被覆盖是解释蜉蝣目、襀翅目和毛翅目幼虫分布的最重要因素。与较小的溪流（一级）相比，降雨对中等等级溪流段（三级、四级）昆虫丰度时间变化的影响更强。
