武汉东湖优势浮游动物元素含量分析

ELEMENTARY COMPOSITION OF SOME DOMINANT ZOOPLANKTERS IN LAKE DONGHU, WUHAN

  • 摘要: 利用武汉东湖不同季节各种浮游动物优势种的高峰期,选取了枝角类中的透明溞和透明薄皮溞,桡足类中的特异荡镖水蚤,轮虫中的矩形龟甲轮虫、前节晶囊轮虫、矩形臂尾轮虫、萼花臂尾轮虫,原生动物中的篮口虫及草履虫进行碳(C)、氮(N)、磷(P)含量分析,分别测出了上述各个种的C/N和C/P比值。就C、N、P的平均百分数看,原生动物所占的C、N、P的百分数最高,相反,其C/N与C/P比率则是最低的。透明薄皮溞所占的C%接近原生动物,特异荡镖水蚤和透明溞的C%相差不远。透明薄皮溞与特异荡镖水蚤的N%极为接近,而轮虫的N%和P%则仅低于原生动物。按实测数据计算的结果,东湖优势浮游动物的个体重(干)是其C含量的2.07—2.46倍。列举了各个种的个体碳、氮和磷量,并对一些较大个体给定了个体重与个体碳关系的回归方程式。

     

    Abstract: Composition of C, N, and P of some dominant zooplankters: two species of claido cera, one species of copepoda, four species of rotatoria, and two species of protozoa from Lake Donghu, Wuhan has been investigated during their production peak.In terms of the mean percentage of C, N. and P, protozoa takes on the maximum values. However, the ratios of C/N and C/P of the protozoa are the minimal. The percentage of C of Leptodora kindti approximates to that of the protozoa, and that of Neutrodiaptomus incongruens is nearly equal to that of Daphnia hyalina. In percentage of N, Leptodora kindti and Neutrodiaptomus incongruens are almost the same. The percentages of N and P in rotatoria are next to that of protozoa. According to the data calculated, the dry weight per individual of the dominant zooplankters in Lake Donghu is 2.07—2.46 times of their eanbon content.The contents of the three main elements per individual animal are calculated. Regressions together with their coefficients of determination are given to show the relationship between the dry weight per individual and the carbon content of the individual, mostly for planktonic crustaceans. The possibility for constructing a regression for microscopic animals on the basis of the dry weight-carbon per individual is discussed.

     

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