Vertical distribution of major photosynthetic picoeukaryotic groups in stratified marine waters
Vertical distribution of major photosynthetic picoeukaryotic groups in stratified marine waters
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DOI：
10.1111/1462-2920.13285
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发表时间：
2016-05-01
影响因子：
5.1
通讯作者：
Massana, Ramon
中科院分区：
文献类型：
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作者：
Cabello, Ana M.;Latasa, Mikel;Massana, Ramon
光合微真核生物是海洋初级生产力的重要贡献者，形成了以原生植物、绿藻、浮游植物和金藻为主的多样性群落。在这里，我们研究了这些主要群体在两个近海地区的北方伊比利亚半岛在夏季分层的垂直分布。我们进行了精细规模的垂直采样（每一个类似2米）整个DCM和使用荧光原位杂交（FISH），以确定PPE的组成，并探讨可能的隔离的目标群体在光，营养和温度梯度。绿藻，pelagophytes和prymnesiophytes，在这个顺序的丰度，占总PPE记录流式细胞仪在阿维莱斯峡谷，超过一半的加利西亚银行，而金藻未被检测到。在这三个检测组中，通常是prymnesiophytes占主导地位的生物量。在一般情况下，所有的群体都存在于整个水柱周围的DCM的丰度峰，但它们的分布不同：浮游植物位于比其他两个组更深，绿藻提出了两个高峰和prymnesiophytes表现出表面丰度在DCM。这项研究提供了第一个迹象表明，不同的PPE组的垂直分布是异质性的DCM。
Photosynthetic picoeukaryotes (PPEs) are fundamental contributors to oceanic primary production and form diverse communities dominated by prymnesiophytes, chlorophytes, pelagophytes and chrysophytes. Here, we studied the vertical distribution of these major groups in two offshore regions of the northern Iberian Peninsula during summer stratification. We performed a fine-scale vertical sampling (every similar to 2 m) across the DCM and used fluorescence in situ hybridization (FISH) to determine the PPE composition and to explore the possible segregation of target groups in the light, nutrient and temperature gradients. Chlorophytes, pelagophytes and prymnesiophytes, in this order of abundance, accounted for the total PPEs recorded by flow cytometry in the Aviles canyon, and for more than half in the Galicia Bank, whereas chrysophytes were undetected. Among the three detected groups, often the prymnesiophytes were dominant in biomass. In general, all groups were present throughout the water column with abundance peaks around the DCM, but their distributions differed: pelagophytes were located deeper than the other two groups, chlorophytes presented two peaks and prymnesiophytes exhibited surface abundances comparable to those at the DCM. This study offers first indications that the vertical distribution of different PPE groups is heterogeneous within the DCM.