气候变化领域集成服务门户(CCPortal): Experimental warming promotes CO2 uptake but hinders carbon incorporation toward higher trophic levels in cyanobacteria-dominated freshwater communities

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DOI	10.1016/j.scitotenv.2024.171029
	Experimental warming promotes CO2 uptake but hinders carbon incorporation toward higher trophic levels in cyanobacteria-dominated freshwater communities
	Colina, Maite; Meerhoff, Mariana; Cabrera-Lamanna, Lucia; Kosten, Sarian
发表日期	2024
ISSN	0048-9697
EISSN	1879-1026
起始页码	920
卷号	920
英文摘要	Shallow freshwaters can exchange large amounts of carbon dioxide (CO2) with the atmosphere and also store significant quantities of carbon (C) in their sediments. Current warming and eutrophication pressures might alter the role of shallow freshwater ecosystems in the C cycle. Although eutrophication has been widely associated to an increase in total phytoplankton biomass and particularly of cyanobacteria, it is still poorly understood how warming may affect ecosystem metabolism under contrasting phytoplankton community composition. We studied the effects of experimental warming on CO2 fluxes and C allocation on two contrasting natural phytoplankton communities: chlorophytes-dominated versus cyanobacteria-dominated, both with a similar zooplankton community with a potentially high grazing capacity (i.e., standardized density of large -bodied cladocerans). The microcosms were subject to two different constant temperatures (control and +4 degrees C, i.e., 19.5 vs 23.5 degrees C) and we ensured no nutrient nor light limitation. CO2 uptake increased with warming in both communities, being the strongest in the cyanobacteria-dominated communities. However, only a comparatively minor share of the fixed C translated into increased phytoplankton (Chl-a), and particularly a negligible share translated into zooplankton biomass. Most C was either dissolved in the water (DIC) or sedimented, the latter being potentially available for mineralization into DIC and CO2, or methane (CH4) when anoxic conditions prevail. Our results suggest that C uptake increases with warming particularly when cyanobacteria dominate, however, due to the low efficiency in transfer through the trophic web the final fate of the fixed C may be substantially different in the long run.
英文关键词	Eutrophication; Climate warming; CO2; cyanobacteria; Zooplankton; Ponds
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS记录号	WOS:001196270300001
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/301264
作者单位	Universidad de la Republica, Uruguay; Aarhus University; Radboud University Nijmegen
推荐引用方式 GB/T 7714	Colina, Maite,Meerhoff, Mariana,Cabrera-Lamanna, Lucia,et al. Experimental warming promotes CO2 uptake but hinders carbon incorporation toward higher trophic levels in cyanobacteria-dominated freshwater communities[J],2024,920.
APA	Colina, Maite,Meerhoff, Mariana,Cabrera-Lamanna, Lucia,&Kosten, Sarian.(2024).Experimental warming promotes CO2 uptake but hinders carbon incorporation toward higher trophic levels in cyanobacteria-dominated freshwater communities.SCIENCE OF THE TOTAL ENVIRONMENT,920.
MLA	Colina, Maite,et al."Experimental warming promotes CO2 uptake but hinders carbon incorporation toward higher trophic levels in cyanobacteria-dominated freshwater communities".SCIENCE OF THE TOTAL ENVIRONMENT 920(2024).