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首页> 外文期刊>Harmful Algae >Prorocentrum minimum(clone Exuv) is nutritionally insufficient, but not toxic to the copepod Acartia tonsa
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Prorocentrum minimum(clone Exuv) is nutritionally insufficient, but not toxic to the copepod Acartia tonsa

机译：最低原肠（克隆Exuv）营养不足，但对co足the螨无毒

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This study tested whether the dinoflagellate Prorocentrum minimum is nutritionally insufficient or toxic to the copepod Acartia tonsa. Experiments were carried out with adult female A. tonsa and the P. minimum clone Exuv, both isolated from Long Island Sound. Initially, the functional and numerical responses of A. tonsa feeding on exponentially growing P. minimum cells were characterized. These experiments revealed that A. tonsa readily ingested P. minimum cells, up to the equivalent of 200% of body carbon day~(-1), but egg production was relatively low, with a maximum egg production rate of 22% of body carbon day~(-1). Hence, the egg production efficiency (egg carbon produced versus cell carbon ingested) was low (10%). In a separate experiment, ingestion and egg production rates were measured as a function of food concentration with cells in different growth stages (early-exponential, late-exponential/early-stationary, and late-stationary growth phase) to simulate conditions during a bloom. There was no indication that cells in the stationary phase resulted in lower ingestion or egg production rates relative to actively growing cells. Egg hatching success remained high ( >80%) and independent of the cell growth phase. In a third experiment specifically designed to test the hypothesis that P. minimum is toxic, ingestion, egg production and egg hatching success were measured when females were fed mixtures of P. minimum and the diatom Thalassiosira weissfiogii, but in which total food concentration was held constant and the proportion of P. minimum in the mixed diet varied. A. tonsa readily ingested P. minimum when it was offered in the mixed diet, with no detrimental effects on egg production or egg hatching observed. Supplementing P. minimum with T. weissfiogii increased both the egg production rate and the egg production efficiency. It is concluded that P. minimum is nutritionally insufficient, but not toxic to A. tonsa. Finally, it is estimated that in the field grazing by A. tonsa is approximately equivalent to 30% of the maximum daily growth rate of P. minimum. Hence, copepod grazing cannot be ignored in field and modeling studies of the population dynamics of P. minimum.
机译：这项研究测试了最低鞭毛原螯虾的营养不足或对the足or螨的毒性。实验是从长岛湾分离出的成年雌性A.tonsa和P.minimal克隆Exuv。最初，表征了以指数生长的最小拟南芥细胞为食的A.tonsa的功能和数值响应。这些实验表明，A.tonsa容易摄入P.最小细胞，最多相当于人体每日碳的200％〜（-1），但产卵量相对较低，最大产卵率为人体碳的22％天〜（-1）。因此，产蛋效率（产蛋碳与摄入的细胞碳）低（10％）。在一个单独的实验中，摄食率和产卵率随食物浓度的变化而变化，其中细胞处于不同的生长阶段（早期指数，晚期指数/早期静止和晚期静止生长期），以模拟开花期间的状况。没有迹象表明，相对于活跃生长的细胞，静止期的细胞导致较低的摄入或产卵率。卵孵化成功率仍然很高（> 80％），并且与细胞生长期无关。在第三个专门设计的实验中，测试了最小体育有毒的假设，当雌性饲喂最小体育与硅藻Thalassiosira weissfiogii的混合物，但其中总食物浓度保持不变时，测量了最小体育有毒，摄食，产卵和孵卵成功常数和最小日粮在混合饮食中的比例有所不同。混合饮食中提供的A.tonsa极易摄入极少量的P.，对产蛋量或卵孵化没有不利影响。用魏氏弓形虫补充最小疫霉可提高产卵率和产卵效率。结论是最小体育营养不足，但对扁豆无毒。最后，据估计，在田间放牧的A.tonsa大约等于最小体育白菜最大日增长率的30％。因此，co足类的放牧在野外和最小体育种群动态的模型研究中不容忽视。

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