Late Quaternary Beetle Faunas of Southwestern Alaska: Evidence of a Refugium for Mesic and Hygrophilous Species

1992 ◽  
Vol 24 (2) ◽  
pp. 133 ◽  
Author(s):  
Scott A. Elias
Keyword(s):  
Late Quaternary ◽  
Hygrophilous Species ◽  
Southwestern Alaska

Postglacial Vegetation and Climate Change in the Northern Bristol Bay Region, Southwestern Alaska

1995 ◽  
Vol 43 (3) ◽  
pp. 382-392 ◽  
Author(s):  
Feng Sheng Hu ◽  
Linda B. Brubaker ◽  
Patricia M. Anderson
Keyword(s):  
Climate Change ◽  
Late Quaternary ◽  
North Pacific Ocean ◽  
Sediment Cores ◽  
Climatic Conditions ◽  
Bristol Bay ◽  
Subsequent Increase ◽  
Climate History ◽  
Vegetation And Climate ◽  
Southwestern Alaska

AbstractPollen analysis of sediment cores from Grandfather and Ongivinuk Lakes reveals a record of postglacial vegetation and climate change in the northern Bristol Bay region. The chronology is based on six conventional14C dates of bulk organic matter from the Grandfather core. A mesic herb tundra dominated the landscape 13,000-9800 yr B.P.Betulashrubs probably first appeared in the region 11,300 yr B.P. but were restricted to favorable microhabitats until 9800 yr B.P. The later establishment ofBetulashrubs and relatively lowBetulapollen abundance in these records compared to other areas of eastern Beringia suggest that postglacial warming in southwestern Alaska was dampened by regional climatic controls, possibly low sea-surface temperatures of the North Pacific Ocean. Between 10,800 and 9800 yr B.P., diminishedBetulashrub cover, along with decreased aquatic productivity as recorded byPediastrumcell nets and biogenic silica, suggest a brief reversion to colder and drier climatic conditions possibly associated with the Younger Dryas event. Around 9800 yr B.P.,Betulashrub tundra and meadow communities expanded, probably in response to increased temperature and precipitation.Alnusarrived and formed extensive thickets within the region ca. 7400 yr B.P. The establishment of the modern boreal forest-tundra ecotone is marked by the arrival ofPicea glaucaat Grandfather Lake ca. 4000 yr B.P. and the subsequent increase to present population densities ca. 2000 yr B.P. The unique features of these pollen records emphasize the spatial complexity of late Quaternary vegetation and climate history in eastern Beringia.

A palynological investigation of true-moss (Bryidae) spores: morphology and occurrence in modern and late Quaternary lake sediments of Alaska

1998 ◽  
Vol 76 (12) ◽  
pp. 2145-2157 ◽  
Author(s):  
L B Brubaker ◽  
P M Anderson ◽  
B M Murray ◽  
D Koon
Keyword(s):  
Boreal Forest ◽  
Late Quaternary ◽  
Late Glacial ◽  
North Slope ◽  
Wall Structure ◽  
Herbarium Specimens ◽  
Glacial Sediments ◽  
The North ◽  
True Moss ◽  
Southwestern Alaska

This study describes (i) spore morphology of 121 Alaskan species of true moss (Bryidae) and (ii) percentages of Bryidae and Sphagnum spores in mud-water interface samples from 46 Alaskan lakes and a late-Quaternary sediment core from Idavain Lake in southwestern Alaska. Bryidae spores were collected from herbarium specimens, prepared by standard palynological chemical treatment and described under light microscopy. An identification key based on spore shape, wall structure, and size recognized 11 major morphological groups. Although family, genus, or species identifications were not possible for most groups, spores of a few genera and species were distinctive. Bryidae spores occurred in 80% of the modern sediment samples, representing boreal forest and three areas of tundra (North Slope, Seward Peninsula, and southwestern Alaska). Bryidae and Sphagnum spore percentages showed greatest differences between the North Slope tundra and other vegetation types, whereas pollen percentages distinguished boreal forest from tundra regions as a group. Bryidae spores were present throughout the Idavain Lake record but were most common in late-glacial sediments. Variations in the abundance of Bryidae spores are consistent with or enhance paleoenvironmental interpretations based on pollen and other spore types.Key words: Bryidae, palynology, spores, Alaska, Quaternary, paleoenvironment.

Late quaternary landscape history and archaeology in the ?Ice-Free Corridor?: Some recent results from Alberta

1996 ◽  
Vol 32 ◽  
pp. 113-126 ◽  
Author(s):  
A BEAUDOIN ◽  
M WRIGHT ◽  
B RONAGHAN
Keyword(s):  
Late Quaternary ◽  
Landscape History

Modelling of late Quaternary climate over Asia: a synthesis

Boreas ◽  
2004 ◽  
Vol 33 (2) ◽  
pp. 155-163 ◽  
Author(s):  
Andrew Bush
Keyword(s):  
Late Quaternary ◽  
Quaternary Climate

GLACIATIONS, CLIMATE, AND VEGETATION OF TAUISKAYA BAY REGION (NORTH PRIOKHOT’E) IN THE LATE QUATERNARY

2015 ◽  
pp. 50
Author(s):  
A. A. Galanin ◽  
O. Yu. Glushkova
Keyword(s):  
Late Quaternary

Computer simulation of salinity in the Late Quaternary Lake Lisan

2002 ◽  
Vol 51 (3-4) ◽  
pp. 225-232 ◽  
Author(s):  
Ze'ev B. Begin
Keyword(s):  
Computer Simulation ◽  
Late Quaternary
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