Effects of temperature, irradiance, and salinity on photosynthesis, growth rates, total toxicity, and toxin composition for Alexandrium fundyense isolates from the Gulf of Maine and Bay of Fundy
Effects of temperature, irradiance, and salinity on photosynthesis, growth rates, total toxicity, and toxin composition for Alexandrium fundyense isolates from the Gulf of Maine and Bay of Fundy
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DOI：
10.1016/j.dsr2.2005.06.026
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发表时间：
2005-01-01
影响因子：
3
通讯作者：
Roesler, CS
中科院分区：
文献类型：
--
作者：
Etheridge, SM;Roesler, CS
本研究的目的是确定的光合作用，生长速率，总毒性和毒素组成的两个亚历山大fundyense分离物在实验室中的温度，光照和盐度的影响。助理所研究的芬迪菌培养物分离自墨西哥湾和芬迪湾（BoF）的Monhegan岛（MI）附近的沿海沃茨。室内实验表明，温度对叶绿素最大光合速率的影响最大，光照和盐度的影响可以忽略不计。温度和辐照度对种特异性生长速率的影响最大，MI分离株表现出更大的最大生长速率。BoF分离物通常毒性更大，温度诱导细胞毒性的最大变化，其次是辐照度和盐度。毒性的变化是由于毒素浓度的变化，相对毒素组合物，或两者依赖于分离和实验条件。光合作用或生长与毒性之间缺乏明确的关系，这表明毒性至少部分是由环境条件直接驱动的。分离株特异性A.将fundyense对环境的反应纳入建模工作中，最终可能会增强PSP爆发的预测和监测能力。(c)2005爱思唯尔有限公司保留所有权利。
The objective of this study was to determine the effects of temperature, irradiance, and salinity on photosynthesis, growth rate, total toxicity, and toxin composition for two Alexandrium fundyense isolates in the laboratory. The A. fundyense cultures studied were isolated from coastal waters off Monhegan Island (MI) in the GoM and the Bay of Fundy (BoF). Laboratory experiments demonstrated that temperature exerted the greatest impact on chlorophyll -specific maximal photosynthetic rates with negligible effects by light or salinity. Temperature and irradiance exerted the greatest influence on species-specific growth rates, with the MI isolate exhibiting greater maximal growth rates. The BoF isolate was generally more toxic, with temperature inducing the greatest change in cellular toxicity, followed by irradiance and salinity. Variations in toxicity were due to changes in toxin concentration, the relative toxin composition, or both depending on the isolate and experimental condition. The lack of a clear relationship between photosynthesis or growth and toxicity suggests that toxicity is, at least in part, driven directly by environmental conditions. Isolate-specific A. fundyense responses to the environment incorporated into modeling efforts may ultimately enhance predictive and monitoring capabilities for PSP outbreaks. (c) 2005 Elsevier Ltd. All rights reserved.