INFLUENCE OF UPWELLING RELAXATION ON DINOFLAGELLATES AND SHELLFISH TOXICITY IN RIA-DE-VIGO, SPAIN
INFLUENCE OF UPWELLING RELAXATION ON DINOFLAGELLATES AND SHELLFISH TOXICITY IN RIA-DE-VIGO, SPAIN
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DOI：
10.1016/0272-7714(88)90093-5
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发表时间：
1988-10-01
影响因子：
2.8
通讯作者：
YENTSCH, CM
中科院分区：
文献类型：
--
作者：
FRAGA, S;ANDERSON, DM;YENTSCH, CM
在过去十年中，西班牙西北海岸爆发的麻痹性贝类中毒（PSP）对该地区广泛的贻贝养殖业构成了严重威胁。在夏季，富含营养的深水持续上涌进入河圈，支持了浮游植物的高产。1985年秋天，维戈省发生了一次PSP，与此同时，两种链状鞭毛菌——catenatum裸子鞭毛菌和亲缘原生鞭毛菌突然出现，数量迅速增加，并占据优势地位。现场数据表明，夏季上升流停止时，温暖的近海地表水被输送到河流中。当风向从北风（有利上升流）转变为南风或西风（不利上升流）时，就会发生这种情况；注入的水中含有已确定的海洋和浅海鞭毛藻种群。形成长链的两种鞭毛藻同时出现并占据主导地位，这使我们推测，ria内的小规模水下涌有利于浮游植物中的高效游泳者。这些数据不仅表明这两种物种可能是当地贻贝中PSP毒素的来源，而且还表明，根据上升流指数开发一些鞭毛藻物种的水华预测能力是可行的，上升流指数可以表明近海地表水何时可能被迫进入河圈。
Outbreaks of paralytic shellfish poisoning (PSP) along the north-west coast of Spain have become a serous threat to the extensive mussel farming industry in that region over the last decade. During the summer, high phytoplankton productivity is supported by the sustained upwelling of nutrient-rich deep water into the rias. An episode of PSP in the autumn of 1985 in Ria de Vigo coincided with the sudden appearance, rapid numerical increase, and dominance of two chain-forming dinoflagellates, Gymnodinium catenatum and Protogonyaulax affinis. Field data suggest that warm offshore surface water was transported into the ria as the summer upwelling ceased. This occurred when winds changed from northerly (upwelling favourable) to southerly or westerly (upwelling unfavourable); the injected water contained established populations of oceanic and neritic dinoflagellates. The simultaneous appearance and dominance of two dinoflagellates that form long chains leads us to speculate that the small-scale downwelling of water within the ria favoured efficient swimmers among the phytoplankton. These data not only implicate these two species as possible sources of the PSP toxins in local mussels, but they also suggest the feasibility of developing a bloom prediction capability for some dinoflagellate species based in part on an upwelling index that can indicate when offshore surface waters might be forced into the rias.