Lake sediments from Store Koldewey, Northeast Greenland, as archive of Late Pleistocene and Holocene climatic and environmental changes

Klug, Martin; Schmidt, Steffi; Bennike, Ole; Heiri, Oliver; Melles, Martin; Wagner, Bernd

doi:10.1111/j.1502-3885.2008.00038.x

Cited by 24 publications

(51 citation statements)

References 64 publications

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“…Comparative radiocarbon dating of aquatic mosses and terrestrial plants from one horizon revealed that the aquatic mosses were 520 years older than the terrestrial plant remains (Table 1; Klug et al 2009). Because terrestrial plant remains are regarded as representing the more reliable dates, 520 years was subtracted from all moss ages (Table 1; Klug et al 2009). For the Hjort Lake record, seven samples of terrestrial plant remains and four samples of aquatic mosses were dated (Table 1).…”

Section: Methodsmentioning

confidence: 99%

“…The age models for Duck Lake and Hjort Lake (Fig. 2) are discussed in more detail in Klug et al (2009) and Wagner et al (2008).…”

Section: Methodsmentioning

confidence: 99%

“… Age–depth models of the composite sediment sequences Lz1103 from Duck Lake (grey) and Lz1104 from Hjort Lake (black). Details on radiocarbon dating and age calibration are given in Wagner et al (2008) and Klug et al (2009). …”

Section: Methodsmentioning

confidence: 99%

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Chironomids as indicators of the Holocene climatic and environmental history of two lakes in Northeast Greenland

Schmidt¹,

Wagner²,

Heiri³

et al. 2010

Boreas

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Schmidt, S., Wagner, B., Heiri, O., Klug, M., Bennike, O. & Melles, M. 2010: Chironomids as indicators of the Holocene climatic and environmental history of two lakes in Northeast Greenland. Boreas, 10.1111/j.1502‐3885.2010.00173.x. ISSN 0300‐9483. Two Holocene sediment sequences from arctic lakes on Store Koldewey, an island in Northeast Greenland, were investigated for fossil chironomid assemblages. A total of 18 and 21 chironomid taxa were identified in 290‐ and 252‐cm‐long sediment sequences from Duck Lake and Hjort Lake, respectively. The chironomid assemblages were very similar in the two lakes. Canonical correspondence analysis (CCA) was used to compare fossil chironomid assemblages from Store Koldewey with chironomid assemblages and environmental conditions presently found in Canadian Arctic lakes and, hence, to infer environmental changes for Northeast Greenland. The first chironomids appeared at c. 9500 cal. a BP in Hjort Lake, and 500 years later in Duck Lake. Taxa typical for cold and nutrient‐poor arctic lakes dominated the earliest assemblages. Chironomid assemblages with taxa typical of higher summer air temperatures and lakes with higher nutrient availability occur between 8000 and 5000 cal. a BP. This period probably marks the regional Holocene thermal maximum, which is relatively late compared with some palaeoenvironmental records from East Greenland. One possible reason could be the location of Store Koldewey at the very outer coast, with local climatic conditions strongly influenced by the cold East Greenland Current. From around 5000 cal. a BP, chironomid assemblages in Duck Lake and Hjort Lake again became more typical of those presently found in Northeast Greenland, indicating relatively cold and nutrient‐poor conditions. This shift coincides with an increase of ice‐rafting debris off East Greenland and an intensification of the East Greenland Current.

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Section: Methodsmentioning

confidence: 99%

“…The age models for Duck Lake and Hjort Lake (Fig. 2) are discussed in more detail in Klug et al (2009) and Wagner et al (2008).…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Chironomids as indicators of the Holocene climatic and environmental history of two lakes in Northeast Greenland

Schmidt¹,

Wagner²,

Heiri³

et al. 2010

Boreas

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“…Klug et al . ; Bennike & Wagner ). Therefore, the ages are apparently too old with respect to the lithological position in the sediment sequence.…”

Section: Resultsmentioning

confidence: 99%

“…; Klug et al . , b; Schmidt et al . ), the record from Lille Sneha Sø does not indicate a distinct Medieval warm period, but the Little Ice Age with its culmination c .…”

Section: Resultsmentioning

confidence: 99%

Holocene environmental change in theSkallingen area, easternNorthGreenland, based on a lacustrine record

Wagner

Bennike

2014

Boreas

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A lacustrine record from a small lake, Lille Sneha Sø, in the Skallingen area indicates that the region was deglaciated in the early Holocene, prior to 8000 cal. a BP. Deglaciation was probably triggered by high temperatures, but it took more than 1000 years for the lake and the catchment to stabilize. Chironomids were amongst the first invertebrates to colonize the lake. The fossil chironomid assemblage is fairly rich and comparable to other records from further south in Greenland. The pioneer vegetation in the area consisted of mosses and herbaceous plants. The oldest remains of woody plants (Salix arctica) are dated to c. 7700 cal. a BP, and remains of Dryas integrifolia appear at around 6700 cal. a BP; these are the only woody plants recorded. Maximum concentrations of chironomids, maximum occurrence of ephippia of the water flea Daphnia pulex, highest organic matter contents and lowest minerogenic input from c. 7700 to 4400 cal. a BP probably reflect the Holocene thermal maximum (HTM). The highest temperatures during the HTM are indicated around 7000 cal. a BP, when Salix arctica, which is considered a warmth‐loving plant, had a maximum. Comparisons with Holocene records from East and North Greenland show similar immigration histories and similar trends, with the Little Ice Age as the coldest period during the Holocene, culminating about 150 years ago. Subsequent warming does not indicate environmental conditions comparable to the HTM yet at this stage. The occurrence of several warmth‐demanding species particularly in the early Holocene sediments indicates redeposition and implies that temperatures in the past, most likely during an interglacial period, were significantly higher than during the HTM.

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Changes in midge assemblages (Diptera Chironomidae) in an alpine lake from the Italian Western Alps: the role and importance of fish introduction

et al. 2020

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Introduction of exotic species is one of the major human impacts for decline in autochthonous biodiversity. In freshwater lentic environments, alien fish introduction heavily shapes macrobenthic invertebrate structure, with special regard for Chironomidae (Diptera) community. These effects could be more evident in alpine lakes whose environments are considered as remote and undisturbed, but extremely susceptible and vulnerable to both natural and anthropogenic impacts. In this context, modern and subfossil chironomid assemblages were studied in a highaltitude lake (Balma Lake, Piedmont, Italy) which was not previously investigated and subject to brook trout introduction for recreational fishing at the end of the twentieth century (after 1970). Seasonal samplings (summer, autumn) were performed in five littoral and three deep sites, while a core sample was extracted from the deepest point of the lake. The analysis highlighted significant differences in subfossil chironomid communities before and after fish introduction and between subfossil and modern communities, with notable decrease in recent diversities. Dissimilarities were mainly related to Corynocera oliveri, Zavrelimyia, Micropsectra, Metriocnemus, and Heterotrissocladius marcidus type. Therefore, this study highlights the importance and effects of anthropic environmental events, such as fish introduction, in climate reconstructions and their interpretation, especially regarding the last 100/200-year period, when human environmental issues have become more significant.

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Lake sediments from Store Koldewey, Northeast Greenland, as archive of Late Pleistocene and Holocene climatic and environmental changes

Cited by 24 publications

References 64 publications

Chironomids as indicators of the Holocene climatic and environmental history of two lakes in Northeast Greenland

Chironomids as indicators of the Holocene climatic and environmental history of two lakes in Northeast Greenland

Holocene environmental change in theSkallingen area, easternNorthGreenland, based on a lacustrine record

Changes in midge assemblages (Diptera Chironomidae) in an alpine lake from the Italian Western Alps: the role and importance of fish introduction

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