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短尾秀体溞(Diaphanosoma brachyurum)是东湖6—9月的优势种群。作者在实验室恒温条件下,观察了它的发育与生长。这种溢的卵与胚胎发育时间随温度升高而缩短。卵与胚胎发育时间(D)与温度(T)间的迥归方程为: logD=2.0195-1.3784logT 短尾秀体溞的生长速度随龄数而变化,一般可分为3个时期:幼龄为高速生长期,成龄前期为中速生长期,后期则为缓慢生长期。在25℃时有4个幼龄,10个成龄;而在30、35℃时有3个幼龄,12或11个成龄。幼龄的脱皮频率远大于成龄。每个成龄期的平均龄期约为幼龄期的2倍以上,而同卵与胚胎发育的时间基本相等。龄期、寿命与温度呈反比。在25,30,35℃温度下,累计产卵数分别为65.63,69.09,51.77个。产卵率以25℃为最高(1.3421),30℃为其次(1.2856),35℃为最低(1.1488)。
Diaphanosoma brachyurum is the dominant species in Donghu from June to September. The author observed its development and growth under laboratory thermostat conditions. This spawning egg and embryo development time shortens with increasing temperature. The regression equation between egg and embryo development time (D) and temperature (T) is as follows: logD = 2.0195-1.3784logT The growth rate of short-tailed ducker’s body varies with age and can be divided into three stages: young For the high-speed growth period, the early stage of growth is the medium-speed growth period, the latter is the slow growth period. There are 4 young, 10 adult at 25 ° C; and 3 young, 12 or 11 adult at 30, 35 ° C. The frequency of young peeling is far greater than the age. The average age of each adult age is about 2 times the young age, while the same time and embryonic development is basically the same. Age, life expectancy and temperature is inversely proportional. At 25, 30, 35 ℃ temperature, the cumulative number of eggs were 65.63,69.09,51.77. The spawning rate was highest at 25 ℃ (1.3421), followed by 30 ℃ (1.2856) and lowest at 35 ℃ (1.1488).