globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2012.04.009
Scopus记录号: 2-s2.0-84881372403
论文题名:
Evidence for past variations in methane availability in a Siberian thermokarst lake based on δ13c of chitinous invertebrate remains
作者: van Hardenbroek M.; Heiri O.; Parmentier F.J.W.; Bastviken D.; Ilyashuk B.P.; Wiklund J.A.; Hall R.I.; Lotter A.F.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 66
起始页码: 74
结束页码: 84
语种: 英语
英文关键词: Chironomids ; Chitinous remains ; Invertebrates ; Lake sediment ; Methane ; Stable carbon isotopes
Scopus关键词: Chironomids ; Chitinous remains ; Invertebrates ; Lake sediments ; Stable carbon isotopes ; Animals ; Carbon ; Climatology ; Isotopes ; Lakes ; Sediments ; Methane ; carbon isotope ; chitin ; environmental conditions ; fossil record ; invertebrate ; lacustrine deposit ; larva ; methane ; paleoenvironment ; reconstruction ; stable isotope ; thermokarst ; Siberia ; Sweden ; Chironomidae ; Chironomini ; Daphnia ; Invertebrata ; Orthocladiinae ; Ostracoda ; Tanypodinae ; Tanytarsini
英文摘要: Understanding past methane dynamics in arcticwetlands and lakes is crucial for estimating future methane release. Methane fluxes from lake ecosystems have increasingly been studied, yet only few reconstructions of past methane emissions from lakes are available. In this study,we develop an approach to assess changes in methane availability in lakes based on δ13c of chitinous invertebrate remains and apply this to a sediment record from a Siberian thermokarst lake. Diffusive methane fluxes from the surface of ten newly sampled Siberian lakes and seven previously studied Swedish lakes were compared to taxon-specific δ13c values of invertebrate remains from lake surface sediments to investigate whether these invertebrates assimilated 13C-depleted carbon typical for methane. Remains of chironomid larvae of the tribe Orthocladiinae that, in the study lakes, mainly assimilate plant-derived carbon had higher δ13c than other invertebrate groups. δ13c of other invertebrates such as several chironomid groups (Chironomus, Chironomini, Tanytarsini, and Tanypodinae), cladocerans (Daphnia), and ostracods were generally lower. δ13c of Chironomini and Daphnia, and to a lesser extent Tanytarsini was variable in the lakes and lower at sites with higher diffusive methane fluxes. δ13c of Chironomini, Tanytarsini, and Daphnia were correlated significantly with diffusive methane flux in the combined Siberian and Swedish dataset (r1=-0.72, p = 0.001, r = 0.53, p = 0.03, and r1\4;0.81, p < 0.001, respectively), suggesting that δ13c in these invertebrates was affected by methane availability. In a second step, we measured δ13c of invertebrate remains from a sediment record of Lake S1, a shallow thermokarst lake in northeast Siberia. In this record, covering the past ca 1000 years, δ13c of taxa most sensitive to methane availability (Chironomini, Tanytarsini, and Daphnia) was lowest in sediments deposited from ca AD 1250 to ca AD 1500, and after AD 1970, coinciding with warmer climate as indicated by an independent local temperature record. As a consequence the offset in δ13c between methane-sensitive taxa and bulk organic matterwas higher in these sections than in other parts of the core. In contrast, δ13c of other invertebrate taxa did not show this trend. Our results suggest higher methane availability in the study lake during warmer periods and that thermokarst lakes can respond dynamically in their methane output to changing environmental conditions. © 2012 Elsevier Ltd.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60755
Appears in Collections:过去全球变化的重建

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作者单位: Institute of Environmental Biology, Palaeoecology, Laboratory of Palaeobotany and Palynology, Utrecht University, Budapestlaan 4, 3584 CD Utrecht, Netherlands; Institute of Plant Sciences and Oeschger Centre for Climate Change Research, University of Bern, Altenbergrain 21, CH-3013 Bern, Switzerland; Department of Hydrology and Geo-Environmental Sciences, Faculty of Earth and Life Sciences, VU University Amsterdam, De Boelelaan 1085, 1081 HV Amsterdam, Netherlands; Division of Physical Geography and Ecosystems Analysis, Department of Earth and Ecosystem Sciences, Lund University, Sölvegatan 12, 22362 Lund, Sweden; Department of Thematic Studies e Water and Environmental Studies, Linköping University, 58183 Linköping, Sweden; Institute of North Industrial Ecology Problems, Kola Science Centre, Russian Academy of Sciences, 14 Fersman St. Apatity, Murmansk Reg. 184209, Russian Federation; Department of Biology, University of Waterloo, 200 University Avenue West, Waterloo, ON N2G 3L1, Canada

Recommended Citation:
van Hardenbroek M.,Heiri O.,Parmentier F.J.W.,et al. Evidence for past variations in methane availability in a Siberian thermokarst lake based on δ13c of chitinous invertebrate remains[J]. Quaternary Science Reviews,2013-01-01,66
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