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首页> 外文期刊>Oceanology >Spatial Distribution of the Phytoplankton in the White Sea during Atypical Domination of Dinoflagellates (July 2009)
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Spatial Distribution of the Phytoplankton in the White Sea during Atypical Domination of Dinoflagellates (July 2009)

机译：鞭毛藻非典型控制期间白海浮游植物的空间分布（2009年7月）

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摘要

The species composition and biomass of phytoplankton, concentrations of chlorophyll a (Chl a) and nutrients, and accompanying hydrophysical conditions have been studied in the White Sea on July 6-11, 2009. The temperature of the surface water layer was lower than the multiyear average in July. Dinoflagellates dominated in the entire studied area; this was not the typical event for July. We suggest that domination of dinoflagellates was caused by low water temperature, when the nutrient regeneration rate was insufficient to support diatom growth. The abundance of microalgae and the structure of the phytoplankton community depended on the water structure. Variations in the phytoplankton community structure were caused not by substitution of specific species but rather by variability of the abundance of a single species, Heterocapsa triquetra. The highest phytoplankton biomass has been recorded in weakly stratified waters, where tidal mixing supplied the income of inorganic nutrients. The income of nutrients to the photic layer was limited in the stratified waters of Dvina Bay during the summer low-water period, so the phytoplankton abundance was low. We suggest that the lens of surface desalinated water presumably originated from the outlet of the Dvina River was registered in the central part of the White Sea.
机译：2009年7月6日至11日在白海研究了浮游植物的种类组成和生物量，叶绿素a（Chl a）的浓度和养分以及伴随的水物理条件。地表水温度低于多年的温度。七月平均。鞭毛藻在整个研究区域中占主导地位;这不是七月份的典型事件。我们认为，当营养物的再生速率不足以支持硅藻生长时，鞭毛藻的控制作用是由水温低引起的。微藻的丰度和浮游植物群落的结构取决于水的结构。浮游植物群落结构的变化不是由特定物种的替代引起的，而是由单一物种，杂三壳藻的丰富度的变化引起的。在弱分层水中记录了最高的浮游植物生物量，潮汐混合提供了无机养分的收入。在夏季低水期，德维纳湾的分层水域中向光层的养分收入受到限制，因此浮游植物的丰度较低。我们建议，表面上淡化水的晶状体可能是从德维纳河的河口起源的，在白海的中部注册。

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