气候变化领域集成服务门户(CCPortal): A Holocene record of aquatic bio-optics in subarctic fennoscandia

CCPortal

DOI	10.1016/j.quascirev.2020.106491
	A Holocene record of aquatic bio-optics in subarctic fennoscandia
	Nevalainen L.; Rantala M.V.; Meyer-Jacob C.; Kivilä E.H.; Ojala A.E.K.; Smol J.P.; Luoto T.P.
发表日期	2020
ISSN	0277-3791
卷号	243
英文摘要	We investigated a Holocene (since ∼10 500 cal yr BP) sediment core from a high-altitude, UV-sensitive tundra lake in northwestern Finnish Lapland to disentangle long-term dynamics in underwater UV exposure, lake-catchment coupling processes, and aquatic community development under changing climate. We analyzed biogeochemical and paleobiological proxies indicative of catchment impact, lake production and water transparency, including inferences of lake-water total organic carbon (TOC), sediment chlorophyll-a and UV-induced cladoceran (Crustacea) melanin (ABSUV), cladoceran communities, and elemental and isotopic fingerprints of sediment organic matter (OM). The results depicted a general climate-mediated ontogeny of early, mid- and late Holocene limnological regimes. The rapid postglacial temperature increase and the regionally early Holocene temperature maximum initiated lacustrine changes with rapid community turnovers, increasing benthic-dominated autochthonous production and high UV exposure due to low input of terrestrial OM (TOC ∼1–2 mg L−1) from the deglaciated catchment. The mid-Holocene regime was characterized by a general stabilization of the catchment and a benthic-dominated aquatic community that became gradually more productive under the warm and dry climate conditions. Superimposed on late Holocene climate cooling and increasing effective moisture, TOC increased to the highest Holocene values (>3 mg L−1), which was associated with abundant aquatic macrophytes and a phytophilous Acroperus harpae dominated cladoceran community around 4500–3000 cal yr BP. Over the past three millennia, TOC declined to low modern values (∼2 mg L−1) and UV-resistant Alonopsis elongata became the dominant taxon indicating a regime of increased underwater UV exposure. ABSUV was consistently higher around ∼1500–1000 cal yr BP after the late Holocene TOC decline, suggesting a photoprotective response to the new UV regime, possibly through a reduction of available UV refugia among aquatic macrophytes. While ABSUV did not show a straightforward relationship with TOC or solar forcing over the Holocene, the cladoceran community shift suggested a clear limno-ecological response to altering TOC and underwater UV regimes. © 2020
英文关键词	Arctic lakes; Bio-optics; Cladocera; Dissolved organic matter; Lake ontogeny; Paleo-optics; UV radiation
语种	英语
scopus关键词	Biogeochemistry; Catchments; Lakes; Low temperature production; Organic carbon; Runoff; Sediments; Aquatic communities; Aquatic macrophytes; Ecological response; Long term dynamics; Sediment organic matters; Temperature increase; Total Organic Carbon; Water transparency; Aquatic organisms; aquatic community; aquatic environment; autochthony; catchment; climate change; cooling; crustacean; historical record; Holocene; limnology; long-term change; macrophyte; optical method; paleoenvironment; paleotemperature; sediment core; subarctic region; Finland; Lappi [Finland]; Acroperus harpae; Alonopsis elongata; Cladocera; Crustacea
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151365
作者单位	Faculty of Biological and Environmental Sciences, Ecosystems and Environment Research Programme, University of Helsinki, Niemenkatu 73, Lahti, 15140, Finland; CNR-Water Research Institute (IRSA), Unit Verbania, Viale Tonolli 50, Verbania, 28922, Italy; Paleoecological Environmental Assessment and Research Lab, Department of Biology, Queen's University, Kingston, ON K7L 3N6, Canada; Geological Survey of Finland, Vuorimiehentie 4, Espoo, 02150, Finland
推荐引用方式 GB/T 7714	Nevalainen L.,Rantala M.V.,Meyer-Jacob C.,et al. A Holocene record of aquatic bio-optics in subarctic fennoscandia[J],2020,243.
APA	Nevalainen L..,Rantala M.V..,Meyer-Jacob C..,Kivilä E.H..,Ojala A.E.K..,...&Luoto T.P..(2020).A Holocene record of aquatic bio-optics in subarctic fennoscandia.Quaternary Science Reviews,243.
MLA	Nevalainen L.,et al."A Holocene record of aquatic bio-optics in subarctic fennoscandia".Quaternary Science Reviews 243(2020).