气候变化领域集成服务门户(CCPortal): KOSMOS Finland 2012 mesocosm study: Size-fractionated bacterial protein production (BPP) of free-living and particle associated bacteria and abundance of particle associated heterotrophic prokaryotes.

CCPortal

DOI	https://doi.org/10.1594/PANGAEA.868621
	KOSMOS Finland 2012 mesocosm study: Size-fractionated bacterial protein production (BPP) of free-living and particle associated bacteria and abundance of particle associated heterotrophic prokaryotes.
	Hornick; Thomas; Bach; Lennart Thomas; Crawfurd; Katharine J; Spilling; Kristian; Achterberg; Eric Pieter; Woodhouse; Jason N; Schulz; Kai Georg; Brussaard; Corina P D; Riebesell; Ulf; Grossart; Hans-Peter
发布日期	2016-11-18
数据集类型	dataset
英文简介	The oceans absorb about a quarter of the annually produced anthropogenic atmospheric carbon dioxide (CO2), resulting in a decrease in surface water pH, a process termed ocean acidification (OA). Surprisingly little is known about how OA affects the physiology of heterotrophic bacteria or the coupling of heterotrophic bacteria to phytoplankton when nutrients are limited. Previous experiments were, for the most part, undertaken during productive phases or following nutrient additions designed to stimulate algal blooms. Therefore, we performed an in situ large-volume mesocosm (ca. 55 m**3) experiment in the Baltic Sea by simulating different fugacities of CO2 (fCO2) extending from present to future conditions. The study was conducted in July?August after the nominal spring bloom, in order to maintain low-nutrient conditions throughout the experiment. This resulted in phytoplankton communities dominated by small-sized functional groups (picophytoplankton). There was no consistent fCO2-induced effect on bacterial protein production (BPP), cell-specific BPP (csBPP) or biovolumes (BVs) of either free-living (FL) or particle-associated (PA) heterotrophic bacteria, when considered as individual components (univariate analyses). Permutational Multivariate Analysis of Variance (PERMANOVA) revealed a significant effect of the fCO2 treatment on entire assemblages of dissolved and particulate nutrients, metabolic parameters and the bacteria?phytoplankton community. However, distance-based linear modelling only identified fCO2 as a factor explaining the variability observed amongst the microbial community composition, but not for explaining variability within the metabolic parameters. This suggests that fCO2 impacts on microbial metabolic parameters occurred indirectly through varying physicochemical parameters and microbial species composition. Cluster analyses examining the co-occurrence of different functional groups of bacteria and phytoplankton further revealed a separation of the four fCO2-treated mesocosms from both control mesocosms, indicating that complex trophic interactions might be altered in a future acidified ocean. Possible consequences for nutrient cycling and carbon export are still largely unknown, in particular in a nutrient-limited ocean.
空间范围	Latitude: 59.858330 * Longitude: 23.258330
时间范围	2012-06-19T00:00:00 - 2012-08-04T00:00:00
语种	英语
国家	国际
学科大类	气候变化
学科子类	气候变化
文献类型	数据集
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/216713
推荐引用方式 GB/T 7714	Hornick,Thomas,Bach,et al. KOSMOS Finland 2012 mesocosm study: Size-fractionated bacterial protein production (BPP) of free-living and particle associated bacteria and abundance of particle associated heterotrophic prokaryotes..2016-11-18.https://doi.org/10.1594/PANGAEA.868621.