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首页> 外文期刊>Limnology >Description of the individual growth of Daphnia magna (Crustacea: Cladocera) through the von Bertalanffy growth equation. Effect of photoperiod and temperature
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Description of the individual growth of Daphnia magna (Crustacea: Cladocera) through the von Bertalanffy growth equation. Effect of photoperiod and temperature

机译：通过冯·贝塔兰菲（von Bertalanffy）生长方程描述水蚤（Daphnia magna）（甲壳纲：Cladocera）的个体生长。光周期和温度的影响

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摘要

Daphnia magna is a cladoceran used as a model organism in aquatic ecology and ecotoxicology studies. Because growth is a critical parameter to study the effect of environmental conditions on the development of zooplankters, the somatic growth of D. magna was measured here and described by the von Bertalanffy growth equation (VBGE), a mathematical model widely used in fisheries management. For this purpose, the effect of two temperatures (20 and 25°C) and two photoperiod conditions (12:12 and 16:8, light:dark) was assayed. Experiments began with neonate females and were finished when parthenogenetic females reached the age of 41 days; they were fed the microalga Ankistrodesmus falcatus (400,000 cell ml−1, 12 mg l−1, dry weight). According to the VBGE, maximal length (L max) was inversely correlated with the growth rate (K). The highest L max (6.45 mm) was for the females grown at 20°C with the 12:12 photoperiod, whereas the maximum growth rate (K = 0.182 ± 0.010) was for individuals grown at 25°C with the 12:12 photoperiod. The number of clutches during the studied period was significantly higher for females grown at 25°C, 12:12. Temperature affected the growth rate and the maximum size in D. magna; interaction of temperature with photoperiod was also noteworthy. The VBGE was a nifty way to assess the effects of the tested environmental factors.
机译：大型蚤（Daphnia magna）是一种枝角类鱼类，在水生生态学和生态毒理学研究中用作模型生物。由于生长是研究环境条件对浮游动物生长的影响的关键参数，因此在这里测量了D. magna的体细胞生长，并用广泛用于渔业管理的数学模型von Bertalanffy生长方程（VBGE）进行了描述。为此，测定了两个温度（20和25°C）和两个光周期条件（12:12和16：8，光：暗）的影响。实验从新生雌性开始，到孤雌生殖雌性达到41天时结束。给他们喂食微藻类拟南芥（400,000细胞ml-1 ，12 mg l-1 ，干重）。根据VBGE，最大长度（L max ）与增长率（K）成反比。 L max最高（6.45 mm）是在20°C和12:12光照条件下生长的雌性，而最大生长速率（K = 0.182±0.010）是在25°C且光照条件下生长的雌性。 12:12光周期。在研究期间，对于25°C（12:12）生长的雌性，离合器的数量明显更高。温度影响了D. magna的生长速度和最大大小。温度与光周期的相互作用也是值得注意的。 VBGE是评估测试环境因素影响的一种好方法。

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