香溪河大型底栖动物群落结构季节动态

通过大型底栖动物的量化监测，对香溪河水系大型底栖动物季节动态进行研究.共采集大型底栖动物197种，隶属6纲68科，其中，四节蜉、高翔蜉、短尾石蝇为该水系优势类群，不同季节间大型底栖动物优势类群组成存在较大差异.大型底栖动物群落结构以冬季最为复杂，春、秋季次之，夏季相对简单.大型底栖动物功能摄食类群以集食者占优，其次为刮食者、捕食者和滤食者，撕食者丰度最小.典型对应分析表明，不同季节影响底栖动物群落结构的因子差异较大;夏季和秋季营养盐对底栖动物群落结构影响较大，水深对各季度大型底栖动物群落结构均有影响.

Seasonal dynamics of macrozoobenthos community structure in Xiangxi River.

To study the seasonal dynamics of macrozoobenthos community in Xiangxi River, the individuals of macrozoobenthos in the River were quantitatively moni tored. A total of 197 taxa belonging to 6 class and 68 families were collected, among which, Baetis spp., Epeorus spp., and Nemoura spp. were the do minant group s, and their compositions varied with seasons. The macrozoobenthos community was most complicated in winter, followed by in spring and autumn, and the simplest in summer. Gather-collector was the main component of functional feeding groups in Xiangxi River system, followed by scraper, predator, and filter-collector, while shredder only accounted for a small part. Canonical correspondence analysi s showed that the factors affecting the macrozoobenthos community were dissimila r among seasons. In summer and autumn, nutrients had greater effects; and in all seasons, water depth had definite effects.