Bispo P C, Froehlich C G, Oliveira L G
Museu de Zoologia, USP, C.P. 42694, CEP 4299-970, São Paulo, SP, Brazil.
Braz J Biol. 2002 Aug;62(3):409-17. doi: 10.1590/s1519-69842002000300003. Epub 2002 Nov 5.
In this paper the spatial distribution of Plecoptera nymphs in the Almas' River basin, Pirenópolis, GO, was studied. Two Surber samples, each comprising 20 sampling units and totalling 2 m2, were taken in each of the 13 stations, one during the rainy season (January 1994) and the second during the dry season (July 1994). In 5 of these stations, monthly samplings were made from June 1993 to July 1994; in these, temperature, velocity, discharge, electrical conductivity and pH were measured. Regional rainfall was also obtained. To ascertain the distribution of nymphs in the habitat, a separate sample was taken. Of the factors considered, the most important affecting the spatial distribution of the stonefly nymphs were altitude, stream order, and anthropic influence. Locally, the genera Anacroneuria and Kempnyia showed clumped distributions, but the data for Gripopteryx and Tupiperla were inconclusive due to low numbers.
本文研究了位于巴西戈亚斯州皮雷诺波利斯市阿尔马斯河流域襀翅目若虫的空间分布。在13个站点中的每一个站点采集了两个索伯尔样本，每个样本包含20个采样单元，总面积为2平方米，一个在雨季（1994年1月）采集，另一个在旱季（1994年7月）采集。在其中5个站点，于1993年6月至1994年7月进行了月度采样；在这些采样中，测量了温度、流速、流量、电导率和pH值。还获取了区域降雨量。为确定若虫在栖息地中的分布，单独采集了样本。在所考虑的因素中，影响石蝇若虫空间分布的最重要因素是海拔、河流等级和人为影响。在局部地区，Anacroneuria属和Kempnyia属呈现出聚集分布，但由于数量较少，Gripopteryx属和Tupiperla属的数据尚无定论。
