NOTES ON PLANT DISTRIBUTION IN THE ROCKY MOUNTAINS OF ALBERTA

1962 ◽  
Vol 40 (8) ◽  
pp. 1091-1094 ◽  
Author(s):  
R. T. Ogilvie
Keyword(s):  
Rocky Mountains ◽  
Storm Track ◽  
Rocky Mountain ◽  
Distribution Patterns ◽  
Plant Distribution ◽  
Mountain Region ◽  
Climatic Effects ◽  
Southern Area ◽  
Rocky Mountain Region ◽  
Number Of Plant Species

Three kinds of variability in the Rocky Mountain flora of Alberta are considered. The flora is composed of species with two gross distribution patterns: the boreal element and the cordilleran element. There are minor floristic differences from valley to valley; such differences involve the sporadic occurrence of certain species in different valleys. Main consideration is given to another type of floristic variability which involves a major floristic difference between the southern part of the mountain region and the northern part.The Crowsnest–Waterton area in the southern part of Alberta is distinctive climatically and phytosociologically from the rest of the Rocky Mountain region of Alberta. Moreover, a large number of plant species and some animal taxa occur in Alberta only in this area. Two possible features are suggested as being responsible for the distinctiveness of the southern area: the climatic effects of the occurrence of the area within a major storm track; and the existence of an adjacent unglaciated area which, during Pleistocene, could have served as a refugium for taxa which subsequently expanded in the southern area.

‘A Turrible Looking and Furious Anamal’: Comparative Psychology in the Rocky Mountains from Lewis and Clark to Washoe

1987 ◽  
Vol 60 (1) ◽  
pp. 59-62 ◽  
Author(s):  
Philip Howard Gray
Keyword(s):  
Animal Behavior ◽  
Rocky Mountains ◽  
Comparative Psychology ◽  
Rocky Mountain ◽  
Mountain Region ◽  
Laboratory Studies ◽  
Preliminary Attempt ◽  
Complete Enumeration ◽  
Rocky Mountain Region ◽  
Lewis And Clark

A preliminary attempt is made to identify the progress of the study of animal behavior, from native bears to imported apes, in the Rocky Mountain region. The survey includes naturalistic encounters, ethological observations, and laboratory studies, but is not a complete enumeration of animal research in the Rocky Mountains.

INSECTS OF WESTERN CANADA, WITH SPECIAL REFERENCE TO CERTAIN CARABIDAE (COLEOPTERA): PRESENT DISTRIBUTION PATTERNS AND THEIR ORIGINS

1980 ◽  
Vol 112 (11) ◽  
pp. 1129-1144 ◽  
Author(s):  
David H. Kavanaugh
Keyword(s):  
Rocky Mountains ◽  
Rocky Mountain ◽  
Distribution Patterns ◽  
Mountain Region ◽  
Western Canada ◽  
Cascade Mountains ◽  
Insect Fauna ◽  
History Of ◽  
Mountain Systems ◽  
Present Distribution

AbstractMunroe (1956) summarized knowledge of the distribution patterns and history of the Canadian insect fauna; and a general synthesis beyond his conclusions is not yet possible. Results of studies on Nearctic Nebria taxa illustrate present distribution patterns and provide clues to the history of the montane fauna of western Canada. Nebria species and subspecies diversity is greatest in the Coast/Cascade Mountains just south of Canada and decreases northward. Major centers of endemism are located south of Canada, in the Coast/Cascade and southern Rocky Mountain systems, with minor centers found in western Alberta and the Queen Charlotte Islands. Species and subspecies vicariance patterns link Coast/Cascade and Rocky Mountain systems across the Okanagan lowland; and subspecies vicariance patterns link (1) Coast and Cascade mountains across Puget lowland/Georgia Strait and (2) central Canadian Rocky Mountains and Rocky Mountains of western Wyoming. These and other data presented on Nebria distribution patterns and faunal similarities among different mountain ranges and systems suggest that the present montane fauna of western Canada is derived from two source areas—one in the Coast/Cascade Mountain region, one in the Rocky Mountain region, each just south of the Canadian/U.S. border—which were separate and distinct during and after Wisconsinan time. Northern (e.g. Beringian) Wisconsinan refugia apparently did not contribute significantly to the present montane fauna.

Late Pleistocene and Holocene Seasonal Temperatures Reconstructed from Fossil Beetle Assemblages in the Rocky Mountains

1996 ◽  
Vol 46 (3) ◽  
pp. 311-318 ◽  
Author(s):  
Scott A. Elias
Keyword(s):  
Late Pleistocene ◽  
Rocky Mountains ◽  
Rocky Mountain ◽  
Mountain Region ◽  
Small Scale ◽  
Rocky Mountain Region ◽  
Winter Temperatures ◽  
Summer Warming ◽  
Beetle Assemblages ◽  
Climatic Range

Mutual Climatic Range (MCR) analysis was applied to 20 fossil beetle assemblages from 11 sites dating from 14,500 to 400 yr B.P. The fossil sites represent a transect of the Rocky Mountain region from northern Montana to central Colorado. The analyses yielded estimates of mean July and mean January temperatures. The oldest assemblage (14,500 yr B.P.) yielded mean July values of 10–11°C colder than present and mean January values 26–30°C colder than present. Postglacial summer warming was rapid, as indicated by an assemblage dating 13,200 yr B.P., with mean July values only 3–4°C cooler than modern. By 10,000 yr B.P., several assemblages indicate warmer-than-modern mean summer and winter values. By 9000 yr B.P., MCR reconstructions indicate that both summer and winter temperatures were already declining from an early Holocene peak. Mean July values remained above modern levels and mean January values remained below modern levels until 3000 yr B.P. A series of small-scale oscillations followed.

Options for the management of white pine blister rust in the Rocky Mountain Region

2008 ◽  
Author(s):  
Kelly S. Burns ◽  
Anna W. Schoettle ◽  
William R. Jacobi ◽  
Mary F. Mahalovich
Keyword(s):  
Rocky Mountain ◽  
Mountain Region ◽  
White Pine Blister Rust ◽  
White Pine ◽  
Blister Rust ◽  
Rocky Mountain Region

Geophysical studies of crustal structure in the Rocky Mountain region: A review

1998 ◽  
Vol 33 (2) ◽  
pp. 217-228 ◽  
Author(s):  
G. R. Keller ◽  
C. M. Snelson ◽  
A. F. Sheehan ◽  
K. G. Dueker
Keyword(s):  
Crustal Structure ◽  
Rocky Mountain ◽  
Mountain Region ◽  
Rocky Mountain Region

Tectonic controls on basement exhumation in the southern Rocky Mountains (United States): The power of combined zircon (U-Th)/He and K-feldspar 40Ar/39Ar thermochronology

Geology ◽  
2021 ◽  
Author(s):  
Jason W. Ricketts ◽  
Jacoup Roiz ◽  
Karl E. Karlstrom ◽  
Matthew T. Heizler ◽  
William R. Guenthner ◽  
...  
Keyword(s):  
Rocky Mountains ◽  
Rocky Mountain ◽  
Snowball Earth ◽  
Southern Rocky Mountains ◽  
Basement Rocks ◽  
Rocky Mountain Region ◽  
Multi Stage ◽  
Inverse Models ◽  
Multiple Pulses ◽  
Differential Uplift

The Great Unconformity of the Rocky Mountain region (western North America), where Precambrian crystalline basement is nonconformably overlain by Phanerozoic strata, represents the removal of as much as 1.5 b.y. of rock record during 10-km-scale basement exhumation. We evaluate the timing of exhumation of basement rocks at five locations by combining geologic data with multiple thermochronometers. 40Ar/39Ar K-feldspar multi-diffusion domain (MDD) modeling indicates regional multi-stage basement cooling from 275 to 150 °C occurred at 1250–1100 Ma and/or 1000–700 Ma. Zircon (U-Th)/He (ZHe) dates from the Rocky Mountains range from 20 to 864 Ma, and independent forward modeling of ZHe data is also most consistent with multi-stage cooling. ZHe inverse models at five locations, combined with K-feldspar MDD and sample-specific geochronologic and/or thermochronologic constraints, document multiple pulses of basement cooling from 250 °C to surface temperatures with a major regional basement exhumation event 1300–900 Ma, limited cooling in some samples during the 770–570 Ma breakup of Rodinia and/or the 717–635 Ma snowball Earth, and ca. 300 Ma Ancestral Rocky Mountains cooling. These data argue for a tectonic control on basement exhumation leading up to formation of the Precambrian-Cambrian Great Unconformity and document the formation of composite erosional surfaces developed by faulting and differential uplift.

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