气候变化领域集成服务门户(CCPortal): Productivity of mixed kelp communities in an Arctic fjord exhibit tolerance to a future climate

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DOI	10.1016/j.scitotenv.2024.172571
	Productivity of mixed kelp communities in an Arctic fjord exhibit tolerance to a future climate
	Miller, Cale A.; Gazeau, Frederic; Lebrun, Anais; Gattuso, Jean-Pierre; Alliouane, Samir; Urrutti, Pierre; Schlegel, Robert W.; Comeau, Steeve
发表日期	2024
ISSN	0048-9697
EISSN	1879-1026
起始页码	930
卷号	930
英文摘要	Arctic fjords are considered to be one of the ecosystems changing most rapidly in response to climate change. In the Svalbard archipelago, fjords are experiencing a shift in environmental conditions due to the Atlantification of Arctic waters and the retreat of sea-terminating glaciers. These environmental changes are predicted to facilitate expansion of large, brown macroalgae, into new ice-free regions. The potential resilience of macroalgal benthic communities in these fjord systems will depend on their response to combined pressures from freshening due to glacial melt, exposure to warmer waters, and increased turbidity from meltwater runoff which reduces light penetration. Current predictions, however, have a limited ability to elucidate the future impacts of multipledrivers on macroalgal communities with respect to ecosystem function and biogeochemical cycling in Arctic fjords. To assess the impact of these combined future environmental changes on benthic productivity and resilience, we conducted a two-month mesocosm experiment exposing mixed kelp communities to three future conditions comprising increased temperature (+ 3.3 and + 5.3 degrees C), seawater freshening by similar to 3.0 and similar to 5.0 units (i.e., salinity of 30 and 28, respectively), and decreased photosynthetically active radiation (PAR, - 25 and - 40 %). Exposure to these combined treatments resulted in non-significant differences in short-term productivity, and a tolerance of the photosynthetic capacity across the treatment conditions. We present the first robust estimates of mixed kelp community production in Kongsfjorden and place a median compensation irradiance of similar to 12.5 mmol photons m(- 2) h(-1) as the threshold for positive net community productivity. These results are discussed in the context of ecosystem productivity and biological tolerance of kelp communities in future Arctic fjord systems.
英文关键词	Kelp; Arctic; Multi-stressors; Climate change; Net community production; Compensation irradiance
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS记录号	WOS:001236733500001
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/290419
作者单位	Centre National de la Recherche Scientifique (CNRS); Sorbonne Universite; Utrecht University
推荐引用方式 GB/T 7714	Miller, Cale A.,Gazeau, Frederic,Lebrun, Anais,et al. Productivity of mixed kelp communities in an Arctic fjord exhibit tolerance to a future climate[J],2024,930.
APA	Miller, Cale A..,Gazeau, Frederic.,Lebrun, Anais.,Gattuso, Jean-Pierre.,Alliouane, Samir.,...&Comeau, Steeve.(2024).Productivity of mixed kelp communities in an Arctic fjord exhibit tolerance to a future climate.SCIENCE OF THE TOTAL ENVIRONMENT,930.
MLA	Miller, Cale A.,et al."Productivity of mixed kelp communities in an Arctic fjord exhibit tolerance to a future climate".SCIENCE OF THE TOTAL ENVIRONMENT 930(2024).