Development rate of Labidocera euchaeta Giesbrecht in Xiamen Harbor

-The development rate of Labidocera euchaeta Giesbrecht in the Xiamen Harbor was studied in laboratory. The results showed that the development times of egg and larval stages ( D ) were significantly correlated with temperature ( T ), following the Belehradek function, D = α( T -7. 5)-1.0634. The development time from egg to larval stages and adult, as well as generation time can be predicted from the equation for egg development ( α=411/24) by appropriately multipling the constant (α) with a proportion. The development was not isochronal over the whole larval period. Durations of naupliar stages were short and quasi-isochronal, which favored their non-feeding development. In contrast, durations of copepodid stages (C) were long. CV had the longest duration followed by CI, both of which are considered as the critical stages in the larval development. The acclimation effect of the seasonal temperature on the development rate was also observed.

铜离子对克氏纺锤水蚤影响的初步研究

通过对胶州湾附近水域中浮游桡足类优势种之一克氏纺锤水蚤（Ａｃａｒｔｉａ ｃｌａｕｓｉ Ｇｉｅｓｂｒｅｃｈｔ）进行不同浓度梯度钢离子的毒性实验，探讨了重金属污染对浮游桡足类的影响．实验结果表明，铜离子对克氏纺锤水蚤９６ ｈ的 ＬＣ５０为 ３８．１２μｇ／Ｌ。用回归分析方法探讨了铜离子与克氏纺锤水蚤产卵量之间的关系，得出拟合曲线方程为ｙ＝１６．１９＋０６２２Ｘ一０．０２６４Ｘ２／（ｙ──产卵量；Ｘ──铜离子浓度）：曲线走向表明，低浓度的 ＣＵ２＋对克氏纺锤水蚤的产卵有一定的促进作用。对Ｃｕ２＋与卵的孵化率的关系也作了类似的分析，结果两者呈线性负相关，说明Ｃｕ２＋对克氏纺锤水蚤卵的孵化率的影响要大于对产卵量的影响。

胶州湾3种哲水蚤种群动态的研究

本文研究了胶州湾内小拟哲水蚤(Paracalanus parvus Claus),双刺纺锤水蚤(Acartia bifilosa Giesbrecht)和太平洋纺锤水蚤(A.pacifica Steuer)3种哲水蚤一年内的种群结构和种群数量的季节变化规律,并讨论了体长的季节变化及其与温度之间的关系。