OALib Journal期刊
ISSN: 2333-9721
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山东南四湖摇蚊幼虫群落结构及其对富营养化过程的指示
DOI: 10.3724/SP.J.1145.2013.00141, PP. 141-146
Keywords: 摇蚊幼虫,红裸须摇蚊,羽摇蚊,群落结构,富营养化,南四湖
Abstract:
2010年7月至2011年4月对南四湖摇蚊幼虫群落结构进行了季度调查.共采集到12种摇蚊幼虫,平均密度和生物量分别为(861±701)ind/m2和(6.39±5.12)g/m2.优势种红裸须摇蚊(propsilocerusiakamusi)和羽摇蚊(chironomusplumosus)的密度以及生物量分别占总密度和总生物量的97.1%和99.1%,但红裸须摇蚊的密度和生物量显著高于羽摇蚊,分别是羽摇蚊的18.5倍和10.7倍.从水平分布看,红裸须摇蚊在上级湖的密度明显高于下级湖,羽摇蚊则呈全湖性分布,但密度较低.与历史资料相比,南四湖摇蚊幼虫群落发生了显著变化,摇蚊幼虫的平均密度由20世纪80年代初期的88ind/m2增加到目前的861ind/m2,优势种由20世纪80年代的羽摇蚊演变为当前的红裸须摇蚊,并且红裸须摇蚊的密度显著升高,这表明南四湖的富营养化趋势加剧.
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