DOI: 10.1016/j.quascirev.2016.05.022
Scopus记录号: 2-s2.0-84969900530
论文题名: Long-term changes in pigmentation of arctic Daphnia provide potential for reconstructing aquatic UV exposure
作者: Nevalainen L. ; Rantala M.V. ; Luoto T.P. ; Ojala A.E.K. ; Rautio M.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 144 起始页码: 44
结束页码: 50
语种: 英语
英文关键词: Arctic lakes
; Fossil pigments
; Paleolimnology
; UV radiation
; Zooplankton
Scopus关键词: Aquatic organisms
; Biological materials preservation
; Climate change
; Ecology
; Ecosystems
; Lakes
; Melanin
; Paleolimnology
; Radiation effects
; Sedimentation
; Solar energy
; Solar radiation
; Ultraviolet radiation
; Absorbance measurements
; Aquatic communities
; Arctic lakes
; Environmental change
; Fossil pigments
; Solar radiation intensity
; Solar ultraviolet radiation
; Zooplankton
; Aquatic ecosystems
; absorbance
; aquatic community
; arctic environment
; climate change
; core analysis
; environmental change
; fossil record
; lacustrine deposit
; long-term change
; melanin
; paleolimnology
; reconstruction
; solar radiation
; ultraviolet radiation
; zooplankton
; Arctic
; Canada
; Cornwallis Island
; Nunavut
; Queen Elizabeth Islands
; Spitsbergen
; Svalbard
; Svalbard and Jan Mayen
; Cladocera
; Crustacea
; Daphnia
; Daphnia ephippia
英文摘要: Despite the biologically damaging impacts of solar ultraviolet radiation (UV) in nature, little is known about its natural variability, forcing mechanisms, and long-term effects on ecosystems and organisms. Arctic zooplankton, for example the aquatic keystone genus Daphnia (Crustacea, Cladocera) responds to biologically damaging UV by utilizing photoprotective strategies, including pigmentation. We examined the preservation and content of UV-screening pigments in fossil Daphnia remains (ephippia) in two arctic lake sediment cores from Cornwallis Island (Lake R1), Canada, and Spitsbergen (Lake Fugledammen), Svalbard. The aims were to document changes in the degree of UV-protective pigmentation throughout the past centuries, elucidate the adaptive responses of zooplankton to long-term variations in UV exposure, and estimate the potential of fossil zooplankton pigments in reconstructing aquatic UV regimes. The spectroscopic absorbance measurements of fossil Daphnia ephippia under UV (280-400 nm) and visible light (400-700 nm) spectral ranges indicated that melanin (absorbance maxima at UV wavebands 280-350 nm) and carotenoids (absorbance maxima at 400-450 nm) pigments were preserved in the ephippia in both sediment cores. Downcore measurements of the most important UV-protective pigment melanin (absorbance measured at 305 and 340 nm) showed marked long-term variations in the degree of melanisation. These variations likely represented long-term trends in aquatic UV exposure and were positively related with solar radiation intensity. The corresponding trends in melanisation and solar activity were disrupted at the turn of the 20th century in R1, but remained as strong in Fugledammen. The reversed trends in the R1 core were simultaneous with a significant aquatic community reorganization taking place in the lake, suggesting that recent environmental changes, likely related to climate warming had a local effect on pigmentation strategies. This time horizon is also concurrent with previously recorded major ecological shifts in circumpolar lakes when human induced changes in ecological processes of sensitive arctic ecosystems started to occur. The current centennial record of UV-induced melanisation of sedimentary Daphnia ephippia presents unique reference material for assessing UV impacts in arctic aquatic ecosystems before human influence and during the 20th century climate change and provides potential for assessing past aquatic UV regimes. © 2016 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59557
Appears in Collections: 过去全球变化的重建
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作者单位: University of Jyväskylä, Department of Biological and Environmental Science, P.O. Box 35, Jyväskylä, Finland; University of Helsinki, Department of Environmental Sciences, Niemenkatu 73, Lahti, Finland; University of Helsinki, Department of Geosciences and Geography, P.O. Box 64, Helsinki, Finland; Geological Survey of Finland, Betonimiehenkuja 4, Espoo, Finland; Université du Québec à Chicoutimi, Département des Sciences Fondamentales, Centre for Northern Studies (CEN) and Groupe de Recherche Interuniversitaire en Limnologie (GRIL), 555 boulevard de l'Université, Chicoutimi, QC, Canada
Recommended Citation:
Nevalainen L.,Rantala M.V.,Luoto T.P.,et al. Long-term changes in pigmentation of arctic Daphnia provide potential for reconstructing aquatic UV exposure[J]. Quaternary Science Reviews,2016-01-01,144