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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >The effect of food limitation on gonad development and egg production of the planktonic copepod Calanus finmarchicus
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The effect of food limitation on gonad development and egg production of the planktonic copepod Calanus finmarchicus

机译：食物限制对浮游co足类Calaus finmarchicus性腺发育和产卵的影响

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摘要

Calanus finmarchicus, one of the dominant copepods species of the North Atlantic, often encounters low food concentration or quality during the reproductive period; however, our knowledge on the effect of these conditions on reproduction processes is scarce. The present study combines experiments with histological observations to describe the response of C. finmarchicus to limited food focussing on (1) oocyte maturation processes, (2) gonad morphology, (3) egg production rates as a function of spawning frequency and clutch size, and (4) the fuelling of egg production by measuring carbon and nitrogen content of the females. In the laboratory, C. finmarchicus females were exposed to 0, 10, 50, 150 or >300 μg C 1~(-1) for several days. To account for food quality and season, reproductive activity was compared in April and July 1999 between females feeding on diatoms or dinoflagellates. The effect of feeding history was studied in February with females fed and starving prior to the experiment. Feeding conditions had severe effects on oocyte maturation process. Hence, egg production varied significantly with food concentration and quality, season and feeding history due to variation in both clutch size and spawning frequency. Clutch size differed by a factor of 2-4 between food limited and well fed females, and is thus an important parameter for modelling egg production. Changes in clutch size were related to changes of the number of maturing oocytes in the females gonads indicating that the latter can be used to precise the prediction of egg production from preserved samples. The proportion of females carrying at least some mature oocytes was relatively high at low food availability. Apparently, these females used internal body reserves as the carbon and nitrogen content decreased significantly under these conditions. These results indicate that C. finmarchicus embarks on the strategy to enable reproduction in all or many females of a population at low rates when feeding conditions are unfavourable.
机译：finmarchicus螯虾是北大西洋的主要co足类物种之一，在繁殖期间经常遇到食物浓度低或质量低的问题。但是，我们对这些条件对繁殖过程的影响的了解很少。本研究将实验与组织学观察相结合，描述了fin.chimarchicus对有限食物的反应，重点是（1）卵母细胞成熟过程，（2）生殖腺形态，（3）产卵率与产卵频率和离合器大小的关系， （4）通过测量雌性的碳和氮含量来增加产蛋量。在实验室中，C。finmarchicus雌性动物暴露于0、10、50、150或> 300μgC 1〜（-1）数天。为了说明食物的质量和季节，1999年4月和1999年7月比较了以硅藻或鞭毛鞭毛虫为食的雌性的生殖活动。 2月份对喂养史的影响进行了研究，雌性在实验前被喂养和饥饿。喂养条件对卵母细胞成熟过程有严重影响。因此，由于离合大小和产卵频率的变化，产蛋量随食物浓度和质量，季节和进食历史而显着变化。在食物有限和进食充分的雌性之间，离合器的大小相差2-4倍，因此是模拟产蛋量的重要参数。离体大小的变化与雌性腺中成熟卵母细胞数目的变化有关，表明后者可用于精确预测保存样品的产卵量。在食物供应不足的情况下，携带至少一些成熟卵母细胞的雌性比例相对较高。显然，这些雌性利用体内机能储备，因为在这些条件下碳和氮含量显着下降。这些结果表明，在摄食条件不利时，C。finmarchicus采取了使种群中所有或许多女性低繁殖率的策略。

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