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Bacterioplankton dynamics driven by interannual and spatial variation in diatom and dinoflagellate spring bloom communities in the Baltic Sea
Limnology and Oceanography ( IF 4.5 ) Pub Date : 2020-10-01 , DOI: 10.1002/lno.11601
María Teresa Camarena‐Gómez 1, 2 , Clara Ruiz‐González 3 , Jonna Piiparinen 1 , Tobias Lipsewers 1 , Cristina Sobrino 4 , Ramiro Logares 3 , Kristian Spilling 1, 5
Affiliation  

In parts of the Baltic Sea, the phytoplankton spring bloom communities, commonly dominated by diatoms, are shifting toward the co‐occurrence of diatoms and dinoflagellates. Although phytoplankton are known to shape the composition and function of associated bacterioplankton communities, the potential bacterial responses to such a decrease of diatoms are unknown. Here we explored the changes in bacterial communities and heterotrophic production during the spring bloom in four consecutive spring blooms across several sub‐basins of the Baltic Sea and related them to changes in environmental variables and in phytoplankton community structure. The taxonomic structure of bacterioplankton assemblages was partially explained by salinity and temperature but also linked to the phytoplankton community. Higher carbon biomass of the diatoms Achnanthes taeniata, Skeletonema marinoi, Thalassiosira levanderi, and Chaetoceros spp. was associated with more diverse bacterial communities dominated by copiotrophic bacteria (Flavobacteriia, Gammaproteobacteria, and Betaproteobacteria) and higher bacterial production. During dinoflagellate dominance, bacterial production was low and bacterial communities were dominated by Alphaproteobacteria, mainly SAR11. Our results suggest that increases in dinoflagellate abundance during the spring bloom will largely affect the structuring and functioning of the associated bacterial communities. This could decrease pelagic remineralization of organic matter and possibly affect the bacterial grazers communities.

中文翻译:

波罗的海硅藻和鞭毛藻春季开花群落的年际和空间变化驱动浮游细菌动力学

在波罗的海部分地区,通常以硅藻为主的浮游植物春季开花群落正在向硅藻和鞭毛藻的共生转变。尽管已知浮游植物会影响相关的浮游生物群落的组成和功能,但对这种硅藻减少的潜在细菌反应尚不清楚。在这里,我们探索了波罗的海几个次流域连续四次春暖花开期间春暖花开期间细菌群落和异养产生的变化,并将它们与环境变量和浮游植物群落结构的变化相关联。盐度和温度可以部分解释浮游植物组合的分类结构,但也与浮游植物群落有关。硅藻的较高碳生物量Achnanthes taeniataSkeletonema marinoiThalassiosira levanderiChaetoceros spp。与细菌营养丰富的细菌群落(黄细菌,丙酸杆菌和贝氏杆菌)和更高的细菌产量相关。在鞭毛藻统治期间,细菌产量低下,细菌群落主要由Alphaproteobacteria,主要是SAR11所控制。我们的结果表明,春季开花期间鞭毛藻的丰度增加将在很大程度上影响相关细菌群落的结构和功能。这可能会减少上层有机质的再矿化,并可能影响细菌放牧者的群落。
更新日期:2020-10-01
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