Changes in marine dinoflagellate and diatom abundance under climate change
Changes in marine dinoflagellate and diatom abundance under climate change
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DOI：
10.1038/nclimate1388
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发表时间：
2012-04-01
影响因子：
30.7
通讯作者：
Gravenor, Mike B.
中科院分区：
文献类型：
--
作者：
Hinder, Stephanie L.;Hays, Graeme C.;Gravenor, Mike B.
海洋硅藻和甲藻作为重要的初级生产者(硅藻和一些甲藻)和食草动物(一些甲藻)发挥着各种关键的生态系统作用。此外，有些是有害的赤潮(赤潮)物种，人们普遍担心赤潮物种可能正在增加，并伴随着重大的负面社会经济影响，包括对人类健康和海洋捕捞的威胁(1，2)。使用来自连续浮游生物记录器调查的92,263个样本，我们生成了东北大西洋和北海硅藻和甲藻出现的50年(1960-2009年)时间序列。甲藻，包括两个HAB分类群(例如，原甲藻)和非HAB分类群(例如Ceratium Furca)的数量大量减少，特别是自2006年以来。相比之下，硅藻丰度没有出现这种下降，一些常见的硅藻，包括两种赤潮藻(例如，假氮藻属)。和非赤潮藻(如海链霉属)分类群，数量不断增加。总体而言，这些变化导致硅藻相对于甲藻的相对丰度显着增加。我们的分析，包括确定因果关系标准的格兰杰检验，表明这种转变是由海洋表面温度上升和夏季风越来越大的条件共同作用的结果。
Marine diatoms and dinoflagellates play a variety of key ecosystem roles as important primary producers (diatoms and some dinoflagellates) and grazers (some dinoflagellates). Additionally some are harmful algal bloom (HAB) species and there is widespread concern that HAB species may be increasing accompanied by major negative socio-economic impacts, including threats to human health and marine harvesting(1,2). Using 92,263 samples from the Continuous Plankton Recorder survey, we generated a 50-year (1960-2009) time series of diatom and dinoflagellate occurrence in the northeast Atlantic and North Sea. Dinoflagellates, including both HAB taxa (for example, Prorocentrum spp.) and non-HAB taxa (for example, Ceratium furca), have declined in abundance, particularly since 2006. In contrast, diatom abundance has not shown this decline with some common diatoms, including both HAB (for example, Pseudonitzschia spp.) and non-HAB (for example, Thalassiosira spp.) taxa, increasing in abundance. Overall these changes have led to a marked increase in the relative abundance of diatoms versus dinoflagellates. Our analyses, including Granger tests to identify criteria of causality, indicate that this switch is driven by an interaction effect of both increasing sea surface temperatures combined with increasingly windy conditions in summer.