ARCTIC Post-Glacial Vegetation History of the Ittlemit Lake Basin, Southwest Yukon Territory
ABSTRACT. The pollen record of a 240 cm peat profile in the Ittlemit Lake area in southwest Yukon Territory presents a vegetation development history of the last 9OOO radiocarbon years. Spruce migrated into the area at least 9OOO radiocarbon years ago. From 9OOO yr BP to approximately 5000 yr BP the...
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| Format: | Text |
| Language: | English |
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1990
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.517.1909 http://pubs.aina.ucalgary.ca/arctic/Arctic44-1-23.pdf |
| Summary: | ABSTRACT. The pollen record of a 240 cm peat profile in the Ittlemit Lake area in southwest Yukon Territory presents a vegetation development history of the last 9OOO radiocarbon years. Spruce migrated into the area at least 9OOO radiocarbon years ago. From 9OOO yr BP to approximately 5000 yr BP the area supported a sparse Piceu-Sulk-Betufu forest-tundra vegetation. By 5000 yr BP local environmental change created a different habitat primarily affecting he local taxa. Alnus invaded the general area shortly after 5000 yr BP. A local Betuludominated community replaced the previous Cyperaceae-dominated one at about 3000 yr BP. A Cyperaceae-dominated community again occupied the area at about 1900 yr BP. Although the local community changed several times, the present regional forest-tundra vegetation has had little change during the last 9000 radiocarbon years. Key words: pollen analysis, paleovegetation, southwest Yukon RfiSUMfi. Le releve des pollens dans un profil de tourbe de 240 cm venant de la region du lac Ittlemit dans le sud-ouest du Territoire du Yukon represente l’histoire de I’evolution de la vkgktation des derniers 9 O00 ans (radiocarbone). Cepinette a fait son apparition dans la r6gion il y a au moins 9 000 ans (radiocarbone). De 9 000 B 5 000 ans environ avant notre ere, la region possedait une vegetation clairsemee de foret-toundra compos6e de Piceu-Sulk-Betula. Environ 5 000 ans avant notre ere, un changement dans l’environnement local a Cr66 un nouvel habitat, ce qui a d’abord affecte les taxons locaux. Peu aprks 5 000 ans avant notre ere, toute la region a kt6 envahie par Ainus. Environ 3 000 ans avant notre ere, une communaute locale B dominance de Betula a remplace la communaute precedente ii dominance de cyptrackes. Une communaute B dominance de cypkracees a de nouveau occupe la region environ 1 900 ans avant notre ere. Bien que la communaut6 |
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