Are different species of Dinophysis selected by climatological conditions?
Are different species of Dinophysis selected by climatological conditions?
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DOI：
10.2989/18142320609504163
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发表时间：
2006-09-01
影响因子：
1.2
通讯作者：
Cabanas, J. M.
中科院分区：
文献类型：
--
作者：
Escalera, L.;Reguera, B.;Cabanas, J. M.
在西班牙西北部加利西亚地区爆发的腹泻性贝毒暴发的主要病原体--尖藻和尖藻在时间和/或空间上呈现隔离状态，并表现出相当大的年际变异性。为了探索这两个物种在夏末暴发中的具体需求及其交替的原因，在气象对比的两年期间，从Ria de Vigo的每月横断面和Ria de Pontevedra试验站的每周采样，研究了水柱的气象驱动结构。与2003年相比，2002年尖吻盘藻的生长季节更长，达到更高的浓度，同时硅藻和甲藻的现存量也更高。夏季极值与温盐层结和持续偏北风有关，日平均风速在2.5-4.0m S(-1)。相比之下，2003年夏季非常炎热，上升流指数为50年来最低，层结受到更强烈的热驱动，因此，尖吻金龟夏末种群被尖吻金龟所取代。Dinophysis spp.的亲缘关系和气候条件，以及2003年比2002年更严重的社会经济影响。
Dinophysis acuminata and D. acuta, the main agents of diarrhetic shellfish poisoning outbreaks in the Galician Rias Baixas, North-West Spain, appear segregated in time and/or space and exhibit considerable interannual variability. To explore the specific requirements of the two species and the causes of their alternation in late-summer outbreaks, the meteorologically driven structure of the water column was examined in relation to Dinophysis populations from monthly transects in Ria de Vigo and weekly sampling at a pilot station in Ria de Pontevedra during 2002 and 2003 - two years with contrasting meteorology. D. acuminata had a longer growth season and reached higher concentrations in parallel with higher standing stocks of diatoms and dinoflagellates during 2002 compared with 2003. Its summer maxima were associated with thermohaline stratification and persistent northerly winds of daily mean velocities of 2.5-4.0m s(-1). In contrast, during 2003, when the summer was very hot and the upwelling index was the lowest for the past 50 years, and the stratification was more intensively thermally driven, the late-summer populations of D. acuminata were replaced by those of D. acuta. The relationship between Dinophysis spp. and climatological conditions, as well as the more severe socio-economic impacts of 2003 relative to 2002, are discussed.