A palaeolimnological record of diatom-community dynamics and late-Holocene climatic changes from Prescott Island, Nunavut, central Canadian Arctic

The Holocene ◽  
2007 ◽  
Vol 17 (6) ◽  
pp. 803-812 ◽  
Author(s):  
Sarah A. Finkelstein ◽  
K. Gajewski
Keyword(s):  
Late Holocene ◽  
Community Dynamics ◽  
Canadian Arctic ◽  
Climatic Changes ◽  
Diatom Community

Tree line shifts, changing vegetation assemblages and permafrost dynamics on Galdhøpiggen (Jotunheimen, Norway) over the past ~4400 years

The Holocene ◽  
2021 ◽  
pp. 095968362110665
Author(s):  
Helen Hallang ◽  
Cynthia A Froyd ◽  
John F Hiemstra ◽  
Sietse O Los
Keyword(s):  
Scots Pine ◽  
Late Holocene ◽  
Accumulation Rate ◽  
Climatic Changes ◽  
Climatic Conditions ◽  
Tree Line ◽  
Peat Core ◽  
Modern Pollen ◽  
Modern Analogue ◽  
Downy Birch

An environmental reconstruction based on palynological evidence preserved in peat was carried out to examine late-Holocene alpine tree line dynamics in the context of past climatic changes on Galdhøpiggen (Jotunheimen, southern Norway). We analysed a peat core taken from a mire at the present-day tree line (1000 m a.s.l.), c. 450 m downslope from the lower limit of sporadic permafrost. We adopted a combination of commonly used indicators of species’ local presence to reconstruct past vegetation assemblages, such as the relative pollen abundance (%), pollen accumulation rate (PAR), and presence of indicator species. Additionally, fossil pollen from the peat sequence was compared to modern pollen from a surface moss polster to establish a modern analogue. The results were compared with studies covering the late-Holocene climatic changes in the area. The reconstruction demonstrates that a pine-dominated woodland reached above the present-day tree line at c. 4300 cal. yr BP, suggesting a warmer climate suitable for Scots pine ( Pinus sylvestris) growth at this altitude. Scots pine retreated to lower altitudes between c. 3400 and 1700 cal. yr BP, accompanied by the descent of the low-alpine shrub-dominated belt, in response to cooling climatic conditions. The colder period covered c. 1700–170 cal. yr BP, and an open downy birch ( Betula pubescens) woodland became widespread at 1000 m a.s.l., whilst pine remained sparse at this altitude. From c. 170 cal. yr BP onwards, warming allowed pine to re-establish its local presence alongside downy birch at 1000 m a.s.l.

scholarly journals Community dynamics of bottom-ice algae in Dease Strait of the Canadian Arctic

2016 ◽  
Vol 149 ◽  
pp. 27-39 ◽  
Author(s):  
K. Campbell ◽  
C.J. Mundy ◽  
J.C. Landy ◽  
A. Delaforge ◽  
C. Michel ◽  
...  
Keyword(s):  
Community Dynamics ◽  
Canadian Arctic ◽  
Ice Algae

Holocene History of the Bering Sea Bowhead Whale (Balaena Mysticetus) in Its Beaufort Sea Summer Grounds off Southwestern Victoria Island, Western Canadian Arctic

2001 ◽  
Vol 55 (3) ◽  
pp. 371-379 ◽  
Author(s):  
Arthur S. Dyke ◽  
James M. Savelle
Keyword(s):  
Bering Sea ◽  
Late Holocene ◽  
Canadian Arctic ◽  
Beaufort Sea ◽  
Bowhead Whale ◽  
Bering Strait ◽  
Range Limit ◽  
Summer Range ◽  
Victoria Island ◽  
The Bering Sea

AbstractThe fossil remains of 43 bowhead whales were mapped on the raised beaches of western Wollaston Peninsula, Victoria Island, Canadian Arctic, near the historic summer range limit of the Bering Sea stock in the Beaufort Sea. The elevations and radiocarbon ages of the remains demonstrate that the bowhead ranged commonly into the region following the submergence of Bering Strait at ca. 10,000 14C yr B.P. until ca. 8500 14C yr B.P. During the same interval, bowheads ranged widely from the Beaufort Sea to Baffin Bay. Subsequently, no whales reached Wollaston Peninsula until ca. 1500 14C yr B.P. Late Holocene populations evidently were small, or occupations were brief, in comparison to those of the early Holocene. Although the late Holocene recurrence may relate to the expansion of pioneering Thule whalers eastward from Alaska, there are few Thule sites and limited evidence of Thule whaling in the area surveyed to support this suggestion.

Diatom and geochemical evidence of mid- to late Holocene climatic changes at Lake Holzmaar, West-Eifel (Germany)

2004 ◽  
Vol 113 (1) ◽  
pp. 81-96 ◽  
Author(s):  
J. Baier ◽  
A. Lücke ◽  
J.F.W. Negendank ◽  
G.-H. Schleser ◽  
B. Zolitschka
Keyword(s):  
Late Holocene ◽  
Climatic Changes ◽  
Geochemical Evidence ◽  
West Eifel
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