Pre- and postsettlement palynology of southern Alberta

Strong, Wayne L

doi:10.1016/0034-6667(77)90027-6

Cited by 24 publications

(15 citation statements)

References 26 publications

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“…Irrigated farming and grazing have led to direct changes in the grassland vegetation. Strong (1977) found that pre-settlement pollen spectra from some sites in the grassland region of Alberta have slightly lower frequencies of Artemisia, Cheno-Am. (Chenopodiaceae and Amaranthaceae) and Selaginella than have modern pollen spectra.…”

Section: Modern Vegetation Of the Study Areamentioning

confidence: 99%

Modern Pollen Spectra From the Western Interior of Canada and the Interpretation of Late Quaternary Vegetation Development

MacDonald

Ritchie

1986

New Phytologist

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SUMMARY The pollen spectra obtained from 127 lake sediment surface samples from the western interior of Canada are examined. Principal components biplots and discriminant analysis are used to investigate the correspondence between modern pollen rain and major vegetation zones in the study area. It is demonstrated that the major vegetation zones in the western interior of Canada can be distinguished on the basis of their modern pollen rain. Principal components biplots and discriminant analysis are also used to compare late Quaternary fossil pollen assemblages from lakes located near the southern and northern periphery of the modern boreal forest with the modern pollen spectra. The results suggest that the late Pleistocene and early Holocene pollen spectra from the southern and northern periphery of the boreal forest lack modern analogues in the western interior of Canada. The northern and southern boundaries of the boreal forest were located north of their modern positions during the mid Holocene. Vegetation developed and responded to mid Holocene climatic change at different rates at the two sites. Modern vegetation conditions were established at both sites between 5000 B.P. to 3000 B.P. Vegetation has remained relatively stable during the last three thousand years.

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Section: Modern Vegetation Of the Study Areamentioning

confidence: 99%

Modern Pollen Spectra From the Western Interior of Canada and the Interpretation of Late Quaternary Vegetation Development

MacDonald

Ritchie

1986

New Phytologist

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“…Aspen Popuhts tremuloides Mixch is an early successional tree species occumng in a wide range of climates throughout most of Canada and the northern United States (Perala 1990). It often occupies recently disturbed sites, and in the boreal forest may succeed to conifers and other boreal species (Perala 1990), In southwestern Canada, It IS the dominant tree species in the aspen parkland, which IS bounded by prairie grassland to the south and boreal forest to the north (Bird 1961), Aspen reproduces well by sprouting after surface fires or droughts that kill trees and conifer seedlings, and both these mechanisms have been implicated m the development and maintenance of the aspen parkland (e.g Bird 1961, Strong 1977, Looman 1979, Hildebrand and Scott 1987 If these, or other non-anthropogenic processes are responsible, the expansion of aspen parkland (e g Strong 1977, Archibold andWilson 1980) should not be an exclusively historic phenomenon…”

Section: Introductionmentioning

confidence: 99%

“…Although most researchers agree that aspen popula-. tions have expanded dunng the last 100 yr (e g Strong 1977, Looman 1979, Archibold and Wilson 1980, Hildebrand and Scott 1987, the mechanism most often proposed IS histonc fire suppression by cultivation and related activities (e.g Bird 1961, Strong 1977, Looman 1979, Archibold and Wilson 1980. Some ecologists have maintained, however, that the exclusion of conifers by drought IS the pnmary controlling factor, and that fire is secondary (e g Lynch 1955) Fossil pollen from ten sites (Fig 1) shows that while small numbers of aspen were present prehistoncally, the region was predominantly grass-covered.…”

Section: Introductionmentioning

confidence: 99%

Bison extirpation may have caused aspen expansion in western Canada

Campbell

Blyth

et al. 1994

Ecography

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“…Dry ice freezing has proven successful in handling watery unconsolidated sediments taken near the mud-water interface in a study of preand post-settlement vegetation change in southern Alberta (Strong 1976). Gooseberry Lake, one of several lakes cored in this study, contained sediments averaging less than 0.07 g dry weight per cubic centimetre.…”

Section: Proposed Methodsmentioning

confidence: 95%