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首页> 外文期刊>Open Journal of Modern Hydrology >Population Dynamics of Cyclopoid Copepods in Lake Kinneret (Israel)
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Population Dynamics of Cyclopoid Copepods in Lake Kinneret (Israel)

机译：Kinneret湖（以色列）中类轮足Co足类的种群动态。

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Reports on the Kinneret zooplankton in general and particularly on copepods are dealing recently with numerical densities of feeding habit classes. Nevertheless, for the evaluation of the integrated role of copepod assemblages in the entire lake ecosystem, their life cycle stages fluctuations are essential. It was not done in previous reports. Therefore, long term analysis of the cyclopoid copepods life stages dynamics in Lake Kinneret was carried out. Due to information availability, two complementary methods of density concentrations were evaluated for two consecutive data sets: 1) 1969-1985 numerical (No/L) documentation of life cycle stages of nauplii (I - III and III - V), copepodites (I, II, III, IV, V) and adults; 2) 1969-2002 monthly averages of wet biomass density (g/m2) of zooplankton major groups combined with metabolic rates. nauplii densities represent June-August peaks and older stages spring decline and high levels during summer-early winter. Polynomial Regressions between Numerical annual averages of predator and Herbivore stages as well as young vs. older life stages indicate significant relations. During winter-spring season, temperatures are optimal for cyclopoid growth as a result of the high efficiency of metabolic activity and the low pressure of fish predation. The high rate of metabolism and intensive fish predation in summer enhance low densities of adult cyclopoids.
机译：有关Kinneret浮游动物的报告，尤其是有关co足类的报告，最近都在处理喂养习惯类别的数字密度。然而，对于评估of足类动物在整个湖泊生态系统中的综合作用，其生命周期阶段的波动至关重要。以前的报告中没有这样做。因此，对Kinneret湖中的摆线足co足类生命阶段动力学进行了长期分析。由于信息的可获得性，针对两个连续的数据集评估了两种浓度密度的互补方法：1）1969-1985年无节幼体（I-III和III-V），co足类动物（I ，II，III，IV，V）和成人; 2）1969-2002年浮游动物主要群体湿生物量密度（g / m2）的月平均值与代谢率结合。无节幼体密度代表6月至8月的高峰，春季处于下降的较早阶段，而夏季至初冬则处于高水平。捕食者和草食动物阶段的年均数字之间以及青年与老年人生命阶段之间的多项式回归表明存在显着的关系。在冬春季节，由于代谢活动的效率高和鱼类捕食的压力低，温度最适合摆线体生长。夏季新陈代谢的高速率和密集的鱼类捕食会增加成虫摆线菌的低密度。

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