A multidisciplinary study of Holocene sediment records from Hjort Sø on Store Koldewey, Northeast Greenland

Wagner, Bernd; Bennike, Ole; Bos, J.A.A.; Cremer, Holger; Lotter, André F.; Melles, Martin

doi:10.1007/s10933-007-9120-3

Cited by 36 publications

(62 citation statements)

References 45 publications

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“…It also contains Festuca sp., one sequence identified as Gnaphalieae, and the second of the early Salix appearances discussed above. The youngest sample of the marine phase records the start of continuous presence of Salix sp., in agreement with previous records of the establishment of S. arctica in North and Northeast Greenland (Funder and Abrahamsen, 1988;Bennike, 1999;Wagner et al, 2008). It is detected until about 2750 cal yr BP as a component of an open vegetation containing plants such as Bistorta vivipara, Ranunculaceae, Saxifraga sp., Cassiope tetragona, Poa sp., Luzula sp.…”

Section: Dna-based Paleoenvironmental History Of Bliss Lake and Surrosupporting

confidence: 91%

“…Empetrum nigrum has repeatedly been recorded as the earliest woody plant in Greenland, with the oldest record from Scoresbysund in East Greenland (70 30 0 N, 21 58 0 W), where its heavy, short-dispersed pollen tetrads are present in the oldest Holocene lake cores that date back to at least 11,000 cal yr BP (Funder, 1978). Macro remains further north in East Greenland, to the north of its present distribution area, date to ca 10,400 cal yr BP Wagner et al, 2008). The early appearance of E. nigrum has been attributed to rapid endozoic transport of the fruit stone by birds, and this might also explain its early appearance in the Bliss Lake record.…”

Section: Dna-based Paleoenvironmental History Of Bliss Lake and Surromentioning

confidence: 99%

“…They record the history of vegetation cover and terrestrial ecosystem changes, as well as changes in aquatic communities, which are sensitive indicators of changing environmental conditions (Smol and Cumming, 2000). Unfortunately, studies of past biotic changes in the low-productivity ecosystems of the High Arctic are often impeded by the lack or scarcity of organismal remains (Funder and Abrahamsen, 1988;Wagner et al, 2008). An additional problem at the limits of species distributions, such as in the Arctic, is diminished rate of sexual reproduction under unfavorable conditions (Klein et al, 2008), resulting in a poor pollen record.…”

Section: Introductionmentioning

confidence: 99%

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Lake sediment multi-taxon DNA from North Greenland records early post-glacial appearance of vascular plants and accurately tracks environmental changes

Epp

Gussarova

Boessenkool

et al. 2015

Quaternary Science Reviews

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a b s t r a c tHigh Arctic environments are particularly sensitive to climate changes, but retrieval of paleoecological data is challenging due to low productivity and biomass. At the same time, Arctic soils and sediments have proven exceptional for long-term DNA preservation due to their constantly low temperatures. Lake sediments contain DNA paleorecords of the surrounding ecosystems and can be used to retrieve a variety of organismal groups from a single sample. In this study, we analyzed vascular plant, bryophyte, algal (in particular diatom) and copepod DNA retrieved from a sediment core spanning the Holocene, taken from Bliss Lake on the northernmost coast of Greenland. A previous multi-proxy study including microscopic diatom analyses showed that this lake experienced changes between marine and lacustrine conditions. We inferred the same environmental changes from algal DNA preserved in the sediment core. Our DNA record was stratigraphically coherent, with no indication of leaching between layers, and our cross-taxon comparisons were in accordance with previously inferred local ecosystem changes. Authentic ancient plant DNA was retrieved from nearly all layers, both from the marine and the limnic phases, and distinct temporal changes in plant presence were recovered. The plant DNA was mostly in agreement with expected vegetation history, but very early occurrences of vascular plants, including the woody Empetrum nigrum, document terrestrial vegetation very shortly after glacial retreat. Our study shows that multitaxon metabarcoding of sedimentary ancient DNA from lake cores is a valuable tool both for terrestrial and aquatic paleoecology, even in low-productivity ecosystems such as the High Arctic.

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Section: Dna-based Paleoenvironmental History Of Bliss Lake and Surrosupporting

confidence: 91%

Section: Dna-based Paleoenvironmental History Of Bliss Lake and Surromentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Lake sediment multi-taxon DNA from North Greenland records early post-glacial appearance of vascular plants and accurately tracks environmental changes

Epp

Gussarova

Boessenkool

et al. 2015

Quaternary Science Reviews

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“…Other studies indicate that in some lakes, diatom production and community composition are more closely related to nutrient availability and light penetration (Baier et al 2004;Malik and Saros 2016) or lake catchment hydrochemistry and only indirectly controlled by climate (Anderson 2000;Anderson et al 2008Anderson et al , 2012Law et al 2015). Our results suggest that this relationship may be further modified by dissolution in warm periods, and out-of-phase relations would appear between independent temperature proxies and the diatom production proxies (e.g., Michelutti et al 2007;Wagner et al 2008). …”

Section: Diatom-free Zones In Arctic Lake Sedimentsmentioning

confidence: 51%

Interactions between climate and landscape drive Holocene ecological change in a High Arctic lake on Somerset Island, Nunavut, Canada

2017

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This study presents a diatom-based analysis of the post-glacial Holocene environmental history at Lake RS29 on Somerset Island in the Canadian High Arctic. Earliest post-glacial diatom assemblages (10 200-10 000 cal yr BP) consisted mainly of small, benthic fragilarioid taxa. Poor diatom preservation in the early Holocene (~10 000-6200 cal yr BP) is associated with warm conditions, as determined by pollen data from the same core and other paleoclimate estimates from the region. Analysis of this and other sites from across the Canadian Arctic suggest that zones of poor diatom preservation or diatom absence in lake sediment records may be associated with warm conditions. After 6200 cal yr BP, acidophilic assemblages consisting of Aulacoseira spp. and a suite of periphytic taxa indicate acidification since the mid-Holocene. During this time period, cooling causing changes in lake ice phenology was likely a major driver of the reconstructed mid-Holocene pH decline. Watershed processes, including reduced fluxes of base cations as the rate of sediment accumulation slowed, may also be contributors to long-term shifts in lake water pH and associated changes in diatom assemblages. The uppermost sediments in the Lake RS29 record were characterized by abrupt declines in Aulacoseira alpigena and increases in benthic diatom taxa Cyclotella sensu lato, suggesting an increase in lake water pH and longer ice-free seasons.Key words: paleoclimate, Holocene, Canadian Arctic Archipelago, lake sediments, diatoms, paleolimnology, pollen, diatom dissolution.Résumé : Cette étude présente une analyse basée sur les diatomées afin d'examiner l'histoire environnementale de l'Holocène postglaciaire au lac RS29 sur l'île Somerset dans le Haut-Arctique canadien. Les tout premiers assemblages de diatomées postglaciaires (10 200 -10 000 ans BP) étaient constitués principalement de petits taxons benthiques fragilarioid. La pauvre conservation des diatomées au cours de l'Holocène précoce (~10 000-6 200 ans BP) est associée aux conditions chaudes, comme déterminées par les données de pollen provenant de la même carotte et d'autres évaluations paléoclimatiques de la région. L'analyse de ce site et d'autres sites à travers l'Arctique canadien suggère que les zones de pauvre conservation de diatomées ou d'absence de diatomées dans les données de sédiments lacustres enregistrées pourraient être associées aux conditions chaudes. Après 6 200 ans BP, les assemblages d'acidiphiles constitués d'Aulacoseira spp. et d'une gamme de taxons periphytiques indiquent l'acidification depuis l'Holocène moyen. Pendant cette période, le refroidissement causant des changements phénologiques de la glace lacustre était probablement un facteur du milieu important causant la baisse du pH reconstruit de l'Holocène moyen. Les processus des bassins hydrographiques, y compris les flux réduits de cations basiques alors que le taux d'accumulation de sédiments a ralenti, peuvent aussi être des facteurs

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“…The finds from the Sisimiut region confirm that N. groenlandicus was an early member of the Holocene fauna of Greenland. Remains of the species have been recorded from a large number of mid-and late Holocene deposits in Greenland McGovern et al 1983;Bö cher & Fredskild 1993;Bö cher 1998;Bennike 2000;Bennike et al 2000;Wagner et al 2008;Buckland et al 2009;Bennike, Knudsen et al 2010). …”

Section: Resultsmentioning

confidence: 99%

Holocene insect remains from south-western Greenland

Böcher¹,

Bennike²,

Wagner³

2012

Polar Research

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A multidisciplinary study of Holocene sediment records from Hjort Sø on Store Koldewey, Northeast Greenland

Cited by 36 publications

References 45 publications

Lake sediment multi-taxon DNA from North Greenland records early post-glacial appearance of vascular plants and accurately tracks environmental changes

Lake sediment multi-taxon DNA from North Greenland records early post-glacial appearance of vascular plants and accurately tracks environmental changes

Interactions between climate and landscape drive Holocene ecological change in a High Arctic lake on Somerset Island, Nunavut, Canada

Holocene insect remains from south-western Greenland

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