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000021990 084__ $$2WoS$$aEnvironmental Sciences
000021990 084__ $$2WoS$$aGeosciences, Multidisciplinary
000021990 084__ $$2WoS$$aLimnology
000021990 1001_ $$0P:(DE-HGF)0$$aHeyng, A.M.$$b0
000021990 245__ $$aEnvironmental changes in northern New Zealand since the Middle Holocene inferred from stable isotope records (d15N, d13C) of Lake Pupuke
000021990 260__ $$aDordrecht [u.a.]$$bSpringer Science + Business Media B.V$$c2012
000021990 300__ $$a351 - 366
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000021990 440_0 $$012462$$aJournal of Paleolimnology$$v48$$x0921-2728$$y2
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000021990 500__ $$aWe thank Gillian Turner and Jim Neale for coring, Markus Oehlerich and Laurentius Sauer for assistance in the isotope lab, Alexander Altenbach for discussions. Thomas Stephens, an anonymous reviewer and the editors Thomas Whitmore and Steffen Mischke provided useful comments on an earlier version of this manuscript. Funding to AL and CM by the German Research Foundation (grant nos. MA 4235/1-1 and LU 786/5-1) is gratefully acknowledged.
000021990 520__ $$aMaar lakes in the Auckland Volcanic Field are important high-resolution archives of Holocene environmental change in the Southern Hemisphere mid-latitudes. Stable carbon and nitrogen isotope analyses were applied on bulk organic matter and the green alga Botryococcus from a sediment core from Lake Pupuke (Auckland, North Island, New Zealand) spanning the period since 7,165 cal. year BP. The origin of organic matter was established using total-organic-carbon-to-nitrogen ratios (TOC/TN) as well as organic carbon (delta C-13(OM)) and nitrogen (delta N-15) isotope composition of potential modern sources. This approach demonstrated that the contribution of allochthonous organic matter to the lake sediment was negligible for most of the record. The sedimentary TOC/TN ratios that are higher than Redfield ratio (i.e. > 7) are attributed to N-limiting conditions throughout the record. Variations of nitrogen and carbon isotopes during the last 7,165 years are interpreted as changes in the dominant processes in the lake. While epilimnetic primary productivity controlled isotope composition before 6,600 cal. year BP, microbial processes, especially denitrification and methane oxidation, caused overall shifts of the delta N-15 and delta C-13 values since the Mid-Holocene. Comparisons with climate reconstructions from the Northern Island suggest that changes in the wind-induced lake overturn and a shift to more pronounced seasonality were the most likely causes for lake-internal changes since 6,600 cal. year BP.
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000021990 65320 $$2Author$$aCarbon
000021990 65320 $$2Author$$aNitrogen
000021990 65320 $$2Author$$aStable isotopes
000021990 65320 $$2Author$$aLacustrine sediment
000021990 65320 $$2Author$$aOrganic matter
000021990 65320 $$2Author$$aBotryococcus
000021990 65320 $$2Author$$aPaleoenvironment
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000021990 7001_ $$0P:(DE-HGF)0$$aMayr, C.$$b1
000021990 7001_ $$0P:(DE-Juel1)129567$$aLücke, A.$$b2$$uFZJ
000021990 7001_ $$0P:(DE-HGF)0$$aStriewski, B.$$b3
000021990 7001_ $$0P:(DE-HGF)0$$aWastegard, S.$$b4
000021990 7001_ $$0P:(DE-Juel1)VDB50316$$aWissel, H.$$b5$$uFZJ
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000021990 8567_ $$uhttp://dx.doi.org/10.1007/s10933-012-9606-5
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