TOXIC AND NOXIOUS PHYTOPLANKTON IN BIG GLORY BAY, STEWART-ISLAND, NEW-ZEALAND
TOXIC AND NOXIOUS PHYTOPLANKTON IN BIG GLORY BAY, STEWART-ISLAND, NEW-ZEALAND
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DOI：
10.1007/bf00003916
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发表时间：
1991-03-01
影响因子：
3.3
通讯作者：
MACKENZIE, L
中科院分区：
文献类型：
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作者：
MACKENZIE, L
在赤潮异形藻(Heterosigma Akashiwo)鱼类大量繁殖期间，对水柱进行的每日垂直剖面采样显示，浮游植物种群几乎完全由各种甲藻组成。其中，丹尼格氏原藻、尖叶裸藻、施瓦茨多刺藻、富贵角藻和螺旋藻为优势种。记录了浮游植物中主要物种的分布，并观察到赤潮藻、丹尼格氏藻和施瓦茨氏藻同步垂直迁徙的证据。在水华期间获得的贝类提取物经小鼠生物测定表明，PSP没有毒性，但略有DSP毒性。在随后的一年浮游植物监测方案中，出现了另一种可能有害的物种(卷毛角毛藻)，并观察到水华期间存在的物种(例如赤潮毛藻)的季节性重现。夏季浮游植物(以硅藻为主的种群与以鞭毛虫为主的种群)之间的重要年际差异是明显的，对气候数据的分析表明，这些差异与抽样的两个夏季期间的不同天气条件有关。数据表明，鱼类水华是通过长期温暖、平静的天气(在此期间发生了几次暴雨事件)导致稳定的水文条件(即分层)和增加海湾内水的滞留时间而发展的。
Diurnal vertical profile sampling of the water column, during a fish killing bloom of the raphidophycean alga Heterosigma akashiwo, revealed a phytoplankton population otherwise composed almost entirely of a variety of dinoflagellates. Of these Glenodinium danicum, Dinophysis acuta, Polykrikos schwartzii, Ceratium furca and Gyrodinium spirale were predominant. The distribution of the major species within the phytoplankton were documented and evidence of synchronous vertical migration of H. akashiwo, G. danicum and P. schwartzii was observed. Extracts of shellfish obtained during the bloom and tested by mouse bioassay showed no PSP toxicity but a marginal degree of DSP toxicity. During a subsequent one year phytoplankton monitoring programme another potentially noxious species (Chaetoceros convolutus) appeared and the seasonal reoccurrence of species present during the bloom (e.g. H. akashiwo) was observed. Important year to year differences in the summer phytoplankton (diatom versus flagellate dominated populations) were apparent and analysis of climate data showed that these differences related to different weather conditions prevailing during the two summer periods sampled. The data suggest the fish killing bloom was giving a chance to develop by a prolonged period of warm, calm weather (during which several heavy rainfall events occurred) leading to stable hydrographic conditions (i.e. stratification) and an increase in the retention time of water within the bay.