Holocene paleohydrological reconstruction and carbon accumulation of a permafrost peatland using testate amoeba and macrofossil analyses, Kuujjuarapik, subarctic Québec, Canada

Lamarre, Alexandre; Garneau, Michelle; Asnong, Hans

doi:10.1016/j.revpalbo.2012.04.009

Cited by 76 publications

(73 citation statements)

References 73 publications

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“…Such dominance of Scorpidium scorpioides allows drawing a parallel with periods when Scorpidium-peat was accumulated in large quantities, e.g., in the Early Holocene in NW European Russia (Oksanen et al, 2003) or Middle Holocene of Quebec (Lamarre et al, 2012) and Alberta (Yu et al, 2003a,b). Later Scorpidium was substituted by Sphagnum or Tomentypnum peat.…”

Section: Discussionmentioning

confidence: 99%

A contribution to the moss flora of Orulgan Range (Yakutia)

Ignatov

Isakova

Ignatova

2014

Arctoa, a jornal of bryology

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Moss flora of the Orulgan Mountain Range in Yakutia is studied on the material of the expedition of 2011, which crossed the Range at 67-68° North. The area comprises northern taiga combined with tundro-steppe areas and mountain tundra vegetation. 241 moss species are revealed including some rare xerophytes, Indusiella thianschanica, Entosthodon pulchellus, Bryoerythrophyllum latinervium, and Didymodon johansenii. Other rare and interesting findings include Orthotrichum holmenii, Meesia hexasticha and Lyellia aspera. However, many arctic species which had been expected to be found were not collected. Regardless of the moderate overall diversity, the area is interesting in a prevailing specific mire type with Scorpidium scorpioides as a dominant, and at places nearly the only moss species. РезюмеПриводятся данные по флоре мхов хребта Орулган (Якутия, Верхоянская горная система), собранные в результате эспедиции 2011 г., пересекшей хребет в долготном направлении на 67-68° северной широты. Изученная территория занята северной тайгой, чередующейся с участками тундростепной растительнсоти и горными тундрами. Был выявлен 241 вид мхов, в том числе некоторые редкие ксерофитные виды: Indusiella thianschanica, Entosthodon pulchellus, Bryoerythrophyllum latinervium и Didymodon johansenii. Среди других интересных находок можно отметить Orthotrichum holmenii, Meesia hexasticha и Lyellia aspera. В то же время многие ожидаемые в этом регионе арктические виды найдены не были. Несмотря на сравнительно небольшое разнообразие мхов, изученная территория интересна тем, что здесь представлен особый тип болот, на которых доминирует Scorpidium scorpioides, местами практически единственный вид мхов.

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Section: Discussionmentioning

confidence: 99%

A contribution to the moss flora of Orulgan Range (Yakutia)

Ignatov

Isakova

Ignatova

2014

Arctoa, a jornal of bryology

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“…Most observational studies have been carried out in the western and central regions of Canada (Halsey et al, 1998;Vitt et al, 2000;Beilman, 2001;Yu et al, 2003;Sannel and Kuhry, 2009). However, in recent years, studies have been conducted in the Hudson Bay Lowlands and the James Bay Lowlands of eastern Canada (Loisel and Garneau, 2010;van Bellen et al, 2011;Bunbury et al, 2012;Lamarre et al, 2012;Garneau et al, 2014;Holmquist and MacDonald, 2014;Packalen and Finkelstein, 2014). Observed LARCA in Zone I is relatively low, as peatlands initiated later in this region due to a late Holocene thermal maximum (5.0-3.0 kyr; Yu et al, 2009) and the presence of the remnants of the Laurentide ice sheet (Gorham et al, 2007).…”

Section: Canada (Zones G To J) and Alaska (Zone F)mentioning

confidence: 99%

Modelling past, present and future peatland carbon accumulation across the pan-Arctic region

2017

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Abstract. Most northern peatlands developed during the Holocene, sequestering large amounts of carbon in terrestrial ecosystems. However, recent syntheses have highlighted the gaps in our understanding of peatland carbon accumulation. Assessments of the long-term carbon accumulation rate and possible warming-driven changes in these accumulation rates can therefore benefit from process-based modelling studies. We employed an individual-based dynamic global ecosystem model with dynamic peatland and permafrost functionalities and patch-based vegetation dynamics to quantify long-term carbon accumulation rates and to assess the effects of historical and projected climate change on peatland carbon balances across the pan-Arctic region. Our results are broadly consistent with published regional and global carbon accumulation estimates. A majority of modelled peatland sites in Scandinavia, Europe, Russia and central and eastern Canada change from carbon sinks through the Holocene to potential carbon sources in the coming century. In contrast, the carbon sink capacity of modelled sites in Siberia, far eastern Russia, Alaska and western and northern Canada was predicted to increase in the coming century. The greatest changes were evident in eastern Siberia, north-western Canada and in Alaska, where peat production hampered by permafrost and low productivity due the cold climate in these regions in the past was simulated to increase greatly due to warming, a wetter climate and higher CO 2 levels by the year 2100. In contrast, our model predicts that sites that are expected to experience reduced precipitation rates and are currently permafrost free will lose more carbon in the future.

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“…Testate amoebae have been used for tracing hydrological changes in temperate peatlands in several regions of the world (Woodland et al, 1998;Booth, 2002;Lamentowicz et al, 2008;Swindles et al, 2009;Turner et al, 2013). Testate amoebae have also been increasingly used as proxies of past hydrological conditions within the boreal and subarctic peatlands of Canada (Loisel and Garneau, 2010;van Bellen et al, 2011;Bunbury et al, 2012;Lamarre et al, 2012;Lamarre et al, 2013). However, the potential of testate amoebae for peatland palaeohydrological reconstruction has not been evaluated in the Arctic.…”

Section: Introductionmentioning

confidence: 99%

Evaluating the use of testate amoebae for palaeohydrological reconstruction in permafrost peatlands

Swindles

Amesbury

Turner

et al. 2015

Palaeogeography, Palaeoclimatology, Palaeoecology

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Evaluating the use of testate amoebae for palaeohydrological reconstruction in permafrost peatlands, Palaeogeography, Palaeoclimatology, Palaeoecology (2015), doi: 10.1016/j.palaeo.2015 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D AbstractThe melting of high-latitude permafrost peatlands is a major concern due to a potential positive feedback on global climate change. We examine the ecology of testate amoebae in permafrost peatlands, based on sites in Arctic Sweden (~200 km north of the Arctic Circle). Multivariate statistical analysis confirms that water-table depth and moisture content are the dominant controls on the distribution of testate amoebae, corroborating the results from studies in mid-latitude peatlands. We present a new testate amoeba-based water table transfer function and thoroughly test it for the effects of spatial autocorrelation, clustered sampling design and uneven sampling gradients. We find that the transfer function has good predictive power; the best-performing model is based on tolerance-downweighted weighted averaging with inverse deshrinking (performance statistics with leave-one-out cross validation: R 2 = 0.87, RMSEP = 5.25 cm). The new transfer function was applied to a short core from Stordalen mire, and reveals a major shift in peatland ecohydrology coincident with the onset of the Little Ice Age (c. AD 1400). We also applied the model to an independent contemporary dataset from Stordalen and find that it outperforms predictions based on other published transfer functions. The new transfer function will enable palaeohydrological reconstruction from permafrost peatlands in Northern Europe, thereby permitting greatly improved understanding of the long-term ecohydrological dynamics of these important carbon stores as well as their responses to recent climate change.

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Holocene paleohydrological reconstruction and carbon accumulation of a permafrost peatland using testate amoeba and macrofossil analyses, Kuujjuarapik, subarctic Québec, Canada

Cited by 76 publications

References 73 publications

A contribution to the moss flora of Orulgan Range (Yakutia)

A contribution to the moss flora of Orulgan Range (Yakutia)

Modelling past, present and future peatland carbon accumulation across the pan-Arctic region

Evaluating the use of testate amoebae for palaeohydrological reconstruction in permafrost peatlands

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