胡家溪摇蚊优势种的生产量动态和物质通量  

Production dynamics and mass flux of dominant chironomid species in Hujiaxi stream of Qingjiang River

作　　者：江晶[1] 温芳妮[1] 邱爽[1] 王利肖[1] 李晓宇[1] 闫云君[1] 

机构地区：[1]华中科技大学生命科学与技术学院,武汉430074

出　　处：《生态学杂志》2011年第11期2540-2546,共7页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(30870427)资助

摘　　要：2006年4月-2007年3月间,对长江支流清江二级支流--胡家溪大型底栖动物群落结构和生产量进行为期一年的调查。结果表明,主要优势摇蚊Conchapelopia sp.的生活史为一年两代,波特真开氏摇蚊(Eukiefferiella potthasti)为一年一代;Conchapelopia sp.的年均密度和年均生物量分别为105ind·m-2、0.1g·m-2,波特真开氏摇蚊为280ind·m-2、0.3g·m-2。采用龄期频率法测算的周年生产量(g·m-2湿重)和生产量/生物量(P/B),Conchapelopia sp.分别为1.2g·m-2、2.3,波特真开氏摇蚊为1.4g·m-2、2.5。2种摇蚊的生产量时间重叠比例相似系数为0.7,重叠主要出现在冬春季节。营养基础分析发现,无形态碎屑为2种摇蚊的主要食物,占其组成的84%以上,对生产量的贡献率分别为80.1%、68.6%。2个优势种的年均物质通量分别为7.2和7.1g·m-2。A one-year investigation from April 2006 to March 2007 was conducted on the production dynamics, trophic basis, and yearly ingestion currency of dominant chironomid species in a second order tributary （ Hujiaxi stream） of Qingjiang River, a tributary of Yangtze River. Six types of habitat from the upper to the lower reaches of Hujiaxi stream were selected for sample collection, with the life cycles of the two dominant ehironomid species Conchapelopia sp. and Eukiefferiella potthasti analyzed based on monthly instar-frequency distribution, the cohort and annual production estimated by size frequency method, and the production dynamics, trophie basis, and yearly ingestion currency examined by the methods of Benke and Wallace （1997） and Benke （1980）. Conchapelopia sp. had two generations a year, while E. potthasti had one generation a year. The mean annual density and mean annual biomass of Conchapelopia sp. were 105 ind.m-2 and0.1 g. m-2, and those orE. potthasti were 280 ind. m-2 and0.3 g. m-2, respectively. The annual production （wet weight） and the annual production/biomass ratio of Conchapelopia sp. were 1.2 g . m-2 and 2.3, and those of E. potthasti were 1.4 g . m-2 and 2.5, respectively. The temporal overlap of the production of the two species measured with proportional similarity index was 0.7, and the overlap mainly occurred in winter and spring. Amorphous detritus was the main food of Conchapelopia sp. and E. potthasti, occupying more than 84% of their diets and contributing 80.1% and 68.6% to their production, respectively. The yearly ingestion currency of Conchapelopia sp. and E. potthasti was 7.2 and 7.1 g . m-2, respectively.

关 键 词：生产量动态 物质通量 摇蚊 胡家溪 

分 类 号：Q968[生物学—昆虫学]