Late Quaternary Vegetational and Climatic History of the Snag-Klutlan Area, Southwestern Yukon Territory, Canada

Rampton, V. N.

doi:10.1130/0016-7606(1971)82[959:lqvach]2.0.co;2

Cited by 91 publications

(81 citation statements)

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“…Tree line movements during the Holocene were not obvious in this pollen record, but Rampton (1971) found spruce logs buried by the White River Ash in alluvial fans at elevations above the present tree line, providing evidence that the alpine tree line was higher at some times in the past. Using pollen records to identify tree line movements in alpine areas is not easy, as Bunbury and Gajewski (2009a) discuss, because pollen grains are transported both upslope and downslope, and pollen influx, although potentially aiding in the interpretation, is difficult to estimate and calibrate.…”

Section: Postglacial Vegetation Historymentioning

confidence: 96%

“…During the late glacial, the area supported herbaceous tundra. The Upper Fly Lake Bunbury andGajewski, 2009a, 2012 5 Long Last Lake Keenan and Cwynar, 1992 6 Two Horsemen Lake Keenan and Cwynar, 1992 7 Jenny Lake Stuart et al, 1989;Bunbury and Gajewski, 2012 8 Donjek Kettle Bunbury and Gajewski, 2012 9 Lake WP02 Bunbury and Gajewski, 2012 10 Antifreeze Pond Rampton, 1971;Vermaire and Cwynar, 2010 11 Jellybean Lake Anderson et al, 2005Anderson et al, , 2007 Marcella Lake Anderson et al, 2007 13 Seven Kloo Lake Zalatan, 2002;Zalatan and Gajewski, 2005 26 Haines Junction Zalatan, 2002;Zalatan and Gajewski, 2005 lake was relatively unproductive, with a high sedimentation rate caused by a large influx of inorganic matter. It is generally assumed that spruce and other trees migrated into the Shakwak Trench area from the east after the Mackenzie valley corridor opened up and Cordilleran ice melted away.…”

Section: Full-glacial and Late Glacial Conditions In Beringiamentioning

confidence: 99%

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Paleoenvironmental Studies in Southwestern Yukon

Gajewski¹,

Bunbury²,

Vetter³

et al. 2014

ARCTIC

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ABSTRACT. The St. Elias Mountain region has occupied an important place in the study of the Quaternary because it presents a relatively accessible non-polar icefield and an array of environments from tundra to boreal forest. Paleoenvironmental studies in southwestern Yukon have documented the broad-scale climatic changes of the past 20 000 years, although few studies exist with well-dated sequences at high temporal resolution. Picea glauca arrived across the entire region around 10 000 years ago; however, the details regarding its migration pathways are not well known. Available records indicate few major changes in the composition of the boreal forest vegetation since that time. A slightly more intense fire regime in the early to mid Holocene has been suggested, but this conclusion is based on only a few studies. Variations in the tree line during the Holocene have been examined, but these studies also lack details. There is no evidence for more extensive grasslands in the area during the Holocene. Paleolimnological studies indicate that changes in populations of aquatic organisms have occurred in response to either Holocene climates or watershed variability.Key words: Quaternary, Holocene, boreal forest, Yukon, Kluane Lake, paleoecology, pollen analysis, paleolimnology, climatic change, dendroclimatology, fire history RÉSUMÉ. La région du mont St. Elias occupe une place importante dans l'étude du Quaternaire parce qu'elle recèle un champ de glace non polaire relativement accessible ainsi qu'une panoplie d'environnements, allant de la toundra à la forêt boréale. Des études paléoécologiques effectuées dans le sud-ouest du Yukon ont permis de documenter les changements climatiques à grande échelle des 20 000 dernières années, et ce, même s'il existe peu d'études dotées de séquences bien datées de grande résolution temporelle. Picea glauca est arrivée dans toute la région il y a environ 10 000 ans. Cependant, les détails concernant sa voie de migration ne sont pas bien connus. Les données disponibles indiquent peu de changements majeurs dans la composition de la forêt boréale depuis cette période. Un régime des feux un peu plus intense de l'Holocène inférieur à l'Holocène moyen a été suggéré, mais cette conclusion ne repose que sur un petit nombre d'études. Les variations caractérisant la limite des arbres pendant l'Holocène ont été examinées, mais ces études ne sont également pas suffisamment détaillées. Il n'existe pas de preuve qu'il existait des prairies à plus grande échelle dans la région pendant l'Holocène. Des études paléolimnologiques indiquent que des changements caractérisant les populations d'organismes se sont produits en raison de la variabilité des climats ou dans des bassins hydrographiques de l'Holocène.

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Section: Postglacial Vegetation Historymentioning

confidence: 96%

Section: Full-glacial and Late Glacial Conditions In Beringiamentioning

confidence: 99%

Paleoenvironmental Studies in Southwestern Yukon

Gajewski¹,

Bunbury²,

Vetter³

et al. 2014

ARCTIC

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“…Cette étude n'est possible que si on séjourne longtemps dans une station. D'autres préfèrent les sédiments lacustres superficiels (Rampton, 1971, Lichti-Federovich et Ritchie, 1968, Wenner, 1947, Davis, 1967. D'autres finalement récoltent des mousses (Rymer, 1973) ou de la tourbe superficielle (Bartley, 1967).…”

Section: Sommet De Palsesunclassified

Étude palynologique d’une palse de la région du golfe de Richmond (lac Guillaume-Delisle), Nouveau-Québec, Canada

Heim¹

2005

cgq

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La présente étude palynologique a été menée dans une tourbière à palses de la toundra forestière, golfe de Richmond, Nouveau-Québec. L'analyse pollinique d'une palse met en évidence une séquence palynologique depuis l'installation dans un bas marais (fen ou tourbière) jusqu'à son exonidation et son bombement caractéristique. Cette évolution a commencé vers 4900 ans BP (datation par le C 14). La végétation de type bas marais (fen) est remplacé vers 3550 ans BP par celle d'une tourbière ombrotrophe (« bog »), traduisant un changement climatique dans le sens d'un refroidissement. À cause de la nature du site inventorié, le diagramme pollinique montre aussi une succession végétale locale. L'étude des relations entre les spectres polliniques récents provenant d'échantillons de mousses de surface et la végétation actuelle a permis de chiffrer les représentations polliniques des espèces dominantes et de discuter certains points particuliers du diagramme pollinique.A pollen study has been undertaken in a palsa bog of the forest-tundra zone, %Richmond Guif, Nouveau-Québec. The pollen analysis of a palsa mound shows a palynological sequence from a fen vegetation initiated 4900 years BP (radiocarbon dating) ago and remplaced by a bog vegetation 3550 years BP ago. This evolution is correlated with a cooling trend of the climate. Because of the specific nature of the sampled site, the pollen diagram illustrates a local plant succession. Relationships between recent pollen spectra and present vegetation are made in order to give a better interpretation of the pollen diagram

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“…The history -including arrival time -of spruce forestation has been documented at Antifreeze Pond, Yukon (Rampton, 1971), Chapman Lake (Terasmae and Hughes, 1966), Kluane Lake (Hopkins et al, 1981), White River valley, Yukon (Denton, 1974), Hanging Lake (Cwyner, 1982), Tuktoyaktuk Peninsula (Ritchie, 1984), Inuvik (Hopkins et al, 1981) and Tanana Valley, Alaska (Ager, 1983).…”

Section: Zone Jl3 (Spruce Forest)mentioning

confidence: 99%

“…for the base of the zone establishes the maximum age of Zone JL2. The zone terminates Direct correlatives of JL2 may be found at John Klondike Bog (Matthews, 1980), Tuktoyaktuk (Ritchie, 1984), Doll Creek, Yukon (Ritchie, 1982), Hanging Lake (Cwynar, 1982), Antifreeze Pond (Rampton, 1971), Brooks Range, Alaska (Livingstone, 1955), Tangle Lakes, Alaska (Ager and Sims, 1981), south-central Alaska (Ager, 1983) and Atlin area, British Columbia (Anderson, 1970).…”

Section: Zone Jl2 (Alder-shrub Nndra)mentioning

confidence: 99%

The Holocene Paleoecology of Jenny Lake Area, Southwest Yukon, and Its Implications for Prehistory

Stuart¹,

Helmer²,

Hills³

1989

ARCTIC

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ABSTRACT. The pollen stratigraphy of a core extracted from Jenny Lake, southwest Yukon, in 1984 has marked archaeological significance. Five palynological zones are identified as follows: Zone JL1, the oldest (CU. 12 500-9500 B.P.), is a Betula shrub tundra assemblage; Zone JL2 (CU. 9500-8500 B.P.) an Alnus shrub tundra; Zone JL3 (CU. 8500-4500 B.P.) a Picea forest; Zone JL4 (CU. 4500-2000 B.P.) a Picea-Alnus woodland; and JL5 (CU. 2000 B.P.-present) a Picea forest. The widely held belief that the Kluane-Aishihik area of the SW Yukon was covered by extensive grasslands well into the Holocene period is not supported by the palynology of the Jenny Lake Core. Instead, palynological evidence suggests that the area, which initially was a Betula shrub tundra, then Alnus shrub tundra, became a Picea-dominated forest by approximately 8500 B.P. and remained forested to the present. The hypothesis stating early prehistoric hunters and gatherers in the SW Yukon were adapted to extensive Holocene grasslands until CU. 3300-2600 B.P. will have to be modified in view of these findings.

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Late Quaternary Vegetational and Climatic History of the Snag-Klutlan Area, Southwestern Yukon Territory, Canada

Cited by 91 publications

References 0 publications

Paleoenvironmental Studies in Southwestern Yukon

Paleoenvironmental Studies in Southwestern Yukon

Étude palynologique d’une palse de la région du golfe de Richmond (lac Guillaume-Delisle), Nouveau-Québec, Canada

The Holocene Paleoecology of Jenny Lake Area, Southwest Yukon, and Its Implications for Prehistory

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