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首页> 外文期刊>Estuarine Coastal and Shelf Science >Plankton community diversity from bacteria to copepods in bloom and non-bloom conditions in the Celtic Sea in spring
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Plankton community diversity from bacteria to copepods in bloom and non-bloom conditions in the Celtic Sea in spring

机译：春季凯尔特海的浮游生物群落从细菌到co足类的开花和非开花条件下的多样性

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摘要

The plankton community composition comprising heterotrophic bacteria, pro-/eukaryotes, heterotrophic nanoflagellates, microzooplankton and mesozooplankton was assessed during the spring bloom and at non-bloom stations in the English Channel and Celtic Sea between 6 and 12 April 2002. Non-bloom sites were characterised by a dominance of pro-/eukaryotic phytoplankton <20 urn, higher abundance of heterotrophic nanoflagellates, microzooplankton standing stocks ranging between 60 and 380 mg C m~-2, lower mesozooplankton diversity and copepod abundance of between 760 and 2600 ind m~-3. Within the bloom, the phytoplankton community was typically dominated by larger cells with low abundance of pro-/eukaryotes. Heterotrophic nanoflagellate cell bio-volume decreased leading to a reduction in biomass whereas microzooplankton biomass increased (360—1500 mg C m~-2) due to an increase in cell bio-volume and copepod abundance ranged between 1400 and 3800 ind m~-3. Mesozooplankton diversity increased with an increase in productivity. Relationships between the plankton community and environmental data were examined using multivariate statistics and these highlighted significant differences in the abiotic variables, the pro-/eukaryotic phytoplankton communities, heterotrophic nanoflagellate, microzooplankton and total zooplankton communities between the bloom and non-bloom sites. The variables which best described variation in the microzooplankton community were temperature and silicate. The spatial variation in zooplankton diversity was best explained by temperature. This study provides an insight into the changes that occur between trophic levels within the plankton in response to the spring bloom in this area.
机译：在春季开花期间以及2002年4月6日至12日在英吉利海峡和凯尔特海的非开花站对包括异养细菌，原核/真核生物，异养纳米鞭毛虫，微浮游藻和中游浮游生物的浮游生物群落组成进行了评估。其特征是原核/真核植物浮游生物<20 um，异养纳米鞭毛的丰度较高，微浮游动物的常备量在60至380 mg C m〜-2之间，中浮游动物的多样性较低，co足动物的丰度在760至2600 ind m〜-之间。 3。在开花期间，浮游植物群落通常以原核生物/真核生物丰度低的较大细胞为主。异养纳米鞭毛细胞的生物量减少导致生物量减少，而微浮游生物的生物量增加（360-1500 mg C m〜-2），这是由于细胞生物量的增加和co足类动物的丰度介于1400和3800 ind m〜-3之间。中生浮游生物的多样性随着生产力的提高而增加。浮游生物群落与环境数据之间的关系使用多变量统计数据进行了检验，这些研究突显了非生物变量，生/真核浮游植物群落，异养纳米鞭毛，微浮游植物和总浮游动物群落在开花点与非开花点之间的显着差异。最能描述微浮游动物群落变化的变量是温度和硅酸盐。浮游动物多样性的空间变化最好用温度来解释。这项研究提供了对浮游生物营养级之间变化的响应，该响应是该地区春季开花的结果。

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