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Growth rates and elemental composition of Alexandrium monilatum, a red-tide dinoflagellate

机译：赤潮鞭毛藻亚历山大藻的生长速率和元素组成

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摘要

The combined effects of temperature and salinity on growth of Alexandrium monilatum were studied in laboratory cultures. This toxic, red-tide dinoflagellate grew faster with higher temperatures, up to a maximum of approximately 1 division per day at 31℃. Salinities above 15 psu had a lesser effect on growth rate, as might be expected for an estuarine species. Growth rates of cultures exposed to natural light and temperature fluctuations were comparable to laboratory cultures. The minimum N cell quota suggested that high N flux would be required to support bloom development. A literature survey of documented A. monilatum blooms indicated that within US waters, blooms occur in July-September in nearshore or estuarine regions of the Gulf of Mexico and the Florida Atlantic coast. Temperature and salinity measured during blooms correspond to the optimal growth conditions of the laboratory cultures. Nevertheless, the occurrence of A. monilatum blooms is sporadic compared to the occurrence of seemingly optimal growth conditions. Laboratory growth experiments predict when blooms of this species are unlikely due to low growth rates, but so far cannot predict individual blooms.
机译：在实验室培养中研究了温度和盐度对山茱Alexandr生长的综合影响。这种有毒的赤潮甲藻鞭毛虫在较高温度下生长较快，在31℃下每天最多可分裂约1格。盐分高于15 psu对增长率的影响较小，这可能是河口物种所预期的。暴露于自然光和温度波动的培养物的生长速率与实验室培养物相当。最小的N细胞配额表明，需要高的N通量来支持开花发展。对已记录的A. monilatum水华的文献调查表明，在美国水域，水华于7月至9月在墨西哥湾和佛罗里达大西洋沿岸的近岸或河口地区发生。盛开期间测得的温度和盐度对应于实验室培养的最佳生长条件。但是，与看似最佳生长条件的发生相比，散发的A. monilatum花朵很少出现。实验室生长实验预测，由于生长速度低，该物种何时不大可能开花，但迄今为止尚无法预测单个开花。

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