海水盐度对大型氵蚤的存活和内禀增长率的影响  

Effects of Salinity of Seawater on the Survival and Intrinsic Rate of Increase of Two Populations of Daphnia Magna

作　　者：何志辉[1] 张建国[1] 姜宏[1] 

机构地区：[1]大连水产学院养殖系

出　　处：《大连水产学院学报》1996年第3期1-7,共7页Journal of Dalian Fisheries University

基　　金：国家自然科学基金

摘　　要：根据２４ｈ半致死盐度值，测定了大型氵蚤两个种群的盐度上限．当直接从淡水移到较高盐度水中时，淡水种群和寡盐水种群的盐度上限分别为７．８‰和８．５‰；当逐渐提高盐度时，盐度上限分别达到１２．０‰和１３．２‰，为了确定大型氵蚤的最适盐度，在室内盐度１‰到７‰间，设４～５个盐度梯度测定这种氵蚤的内禀增长率ｒｍ。The upper salinity limit defined as TL 50 for 24 hours of two populations of Daphnia magna were tested. If they are transferred directly from the freshwater to the water with higher salinities, the lethal upper salinity limits for freshwater and oligohalobic populations are resulted as 7.8‰ and 8.5‰, respectively. If they are treated with gradually increasing salinity, the lethal upper salinity limits of them are 12.0‰ and 13.2‰, respectively. In order to determine the optimum salinity, the intrinsic increase rate of Daphnia magna has been studied in the laboratory under 4￣5 gradients of salinity between 1‰ to 7‰. The results revealed that the highest r m value occured in 2.0‰ both populations.

关 键 词：溲 存活 内禀增长率 海水盐度 活饵料 

分 类 号：S963.21[农业科学—水产养殖]