澜沧江大型底栖动物群落结构及分布格局  

The macrobenthic communities and distribution of the Lancang River

作　　者：王川[1] 李斌[1,2] 谢嗣光[1] 金丽[1] 张耀光[1] 

机构地区：[1]淡水鱼类资源与生殖发育教育部重点实验室,三峡库区生态环境与生物资源省部共建国家重点实验室培育基地,西南大学生命科学学院,重庆400715 [2]内江师范学院生命科学学院,特色农业资源研究与利用四川省高校重点实验室,四川内江641000

出　　处：《淡水渔业》2013年第1期37-43,共7页Freshwater Fisheries

基　　金：农业部公益性行业科研专项经费项目(200902048)

摘　　要：2009年4月-2011年8月,对澜沧江流域的大型底栖动物群落结构、现存量和分布格局进行了4次调查,涉及澜沧江云南段和西藏段的34个采样点。结果显示,大型底栖动物共119种(属),隶属于4门7纲66科,平均密度为243.2 ind./m2,平均生物量为13 016.8 mg/m2,水生昆虫为该流域优势类群。澜沧江流域大型底栖动物的密度、生物量纵向分布呈现高-低-高的分布规律,下游的多样性高于中、上游,科级聚类显示生境相似样点大型底栖动物群落结构类似。与地理环境类似的怒江相比,澜沧江的大型底栖动物密度、生物量组成差异不大,但种类数显著高于怒江。The macrobenthic species composition, distribution and biomass in the Lancang River were investigated from A-pril, 2009 to August, 2011. Total 119 taxa of maerobenthic belonging to 66 families, 7 classes and 4 phyla were indenti-fled. The average density and biomass of macrobenthic were 243.2ind./m^2 and 13 016. 8 mg/m^2, respectively. The density and biomass （from upstream to downstream） of macrobenthic presented a high-low-high mode. Diversity of benthic fauna downstream is higher than that in the upstream and midstream. For the similar habitat sites, the cluster analysis revealed that the macrobenthic composition was similar. Compared with the Nu River, the macrobenthic density and biomass compo-sition were not significantuy different, but the Lancang benthic species River were significantly higher than those in the Nu River.

关 键 词：大型底栖动物 群落 分布 澜沧江 

分 类 号：S932.8[农业科学—渔业资源]