气候变化领域集成服务门户(CCPortal): Warming winters in lakes: Later ice onset promotes consumer overwintering and shapes springtime planktonic food webs

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DOI	10.1073/pnas.2114840118
	Warming winters in lakes: Later ice onset promotes consumer overwintering and shapes springtime planktonic food webs
	Hebért M.-P.; Beisner B.E.; Rautio M.; Fussmann G.F.
发表日期	2021
ISSN	0027-8424
卷号	118 期号:48
英文摘要	Global climate warming is causing the loss of freshwater ice around the Northern Hemisphere. Although the timing and duration of ice covers are known to regulate ecological processes in seasonally ice-covered ecosystems, the consequences of shortening winters for freshwater biota are poorly understood owing to the scarcity of under-ice research. Here, we present one of the first in-lake experiments to postpone ice-cover onset (by ≤21 d), thereby extending light availability (by ≤40 d) in early winter, and explicitly demonstrate cascading effects on pelagic food web processes and phenologies. Delaying ice-on elicited a sequence of events from winter to spring: 1) relatively greater densities of algal resources and primary consumers in early winter; 2) an enhanced prevalence of winter-active (overwintering) consumers throughout the ice-covered period, associated with augmented storage of high-quality fats likely due to a longer access to algal resources in early winter; and 3) an altered trophic structure after ice-off, with greater initial springtime densities of overwintering consumers driving stronger, earlier top-down regulation, effectively reducing the spring algal bloom. Increasingly later ice onset may thus promote consumer overwintering, which can confer a competitive advantage on taxa capable of surviving winters upon ice-off; a process that may diminish spring food availability for other consumers, potentially disrupting trophic linkages and energy flow pathways over the subsequent open-water season. In considering a future with warmer winters, these results provide empirical evidence that may help anticipate phenological responses to freshwater ice loss and, more broadly, constitute a case of climate-induced cross-seasonal cascade on realized food web processes. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Freshwater ice loss; Global climate warming; Phenology; Trophic interactions; Winter limnology
语种	英语
scopus关键词	algal bloom; Article; climate warming; consumer; food availability; food web; greenhouse effect; lake; nonhuman; prevalence; spring; winter; animal; climate; climate change; ecosystem; eutrophication; food chain; ice cover; photosynthesis; physiology; phytoplankton; plankton; Quebec; season; statistical model; time factor; zooplankton; biological marker; fresh water; ice; Animals; Biomarkers; Climate; Climate Change; Ecosystem; Eutrophication; Food Chain; Fresh Water; Ice; Ice Cover; Lakes; Linear Models; Photosynthesis; Phytoplankton; Plankton; Quebec; Seasons; Time Factors; Zooplankton
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/250961
作者单位	Department of Biology, McGill University, Montréal, QC H3A 1B1, Canada; Département des Sciences Biologiques, Université du Québec à Montréal, Montréal, QC H3C 3P8, Canada; Groupe de Recherche Interuniversitaire en LimnologieQC, Canada; Département des Sciences Fondamentales, Université du Québec à Chicoutimi, Chicoutimi, QC G7H 2B1, Canada
推荐引用方式 GB/T 7714	Hebért M.-P.,Beisner B.E.,Rautio M.,et al. Warming winters in lakes: Later ice onset promotes consumer overwintering and shapes springtime planktonic food webs[J],2021,118(48).
APA	Hebért M.-P.,Beisner B.E.,Rautio M.,&Fussmann G.F..(2021).Warming winters in lakes: Later ice onset promotes consumer overwintering and shapes springtime planktonic food webs.Proceedings of the National Academy of Sciences of the United States of America,118(48).
MLA	Hebért M.-P.,et al."Warming winters in lakes: Later ice onset promotes consumer overwintering and shapes springtime planktonic food webs".Proceedings of the National Academy of Sciences of the United States of America 118.48(2021).