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Postglacial evolution and spatial differentiation of seasonal temperate rainforest in western Canada

Brown, K. J.; Nielsen, Anne Birgitte LU ; Fitton, R. J. and Hebda, R. J. (2008) In The Holocene 18(5). p.715-727
Abstract
Surface samples from Vancouver Island, Canada, were used to assess the relationship between discrete seasonal temperate rainforest (STR) plant communities and their corresponding pollen signatures. Pollen from ten sediment cores was further used to evaluate the postglacial development of these communities. Principal components analysis (PCA) of the surface data revealed the distinctiveness of the modern pollen rain, with samples from the Coastal Douglas Fir (CDF) zone, the dry Coastal Western Hemlock (CWH) zone, the wet CWH subzones and the Mountain Hemlock (MH) zone clustering distinctly. PCA of the fossil data revealed early-seral open canopy, wet rainforest, subalpine rainforest and Lateglacial plant associations and showed that the STR... (More)
Surface samples from Vancouver Island, Canada, were used to assess the relationship between discrete seasonal temperate rainforest (STR) plant communities and their corresponding pollen signatures. Pollen from ten sediment cores was further used to evaluate the postglacial development of these communities. Principal components analysis (PCA) of the surface data revealed the distinctiveness of the modern pollen rain, with samples from the Coastal Douglas Fir (CDF) zone, the dry Coastal Western Hemlock (CWH) zone, the wet CWH subzones and the Mountain Hemlock (MH) zone clustering distinctly. PCA of the fossil data revealed early-seral open canopy, wet rainforest, subalpine rainforest and Lateglacial plant associations and showed that the STR has changed markedly through time. Pinus woodlands with low palynological richness prevailed in the early Lateglacial period, only to be supplanted by mixed conifer forest with increased pollen richness. In the early Holocene, STR vegetation differentiated spatially as early-seral open canopy forests expanded, though a non-analogue Picea-dominated forest persisted on the moist outer coast. Generally high pollen richness is attributed to the expansion of dryland habitat coupled with the development of a fire-maintained vegetation mosaic. In the mid- and late-Holocene intervals, open canopy communities persisted in eastern areas, eventually developing into modern CDF and dry CWH forest. In contrast, moist and oceanic CWH rainforest developed on central and western Vancouver Island, whereas subalpine forest established at high elevation. Pollen richness declined in the mid Holocene concomitant with increased precipitation and a general reduction in the incidence of fire, though this trend was offset somewhat in the late Holocene by paludification. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
vegetation history, pollen analysis, temperate rainforest, surface samples, Holocene, British Columbia, Canada
in
The Holocene
volume
18
issue
5
pages
715 - 727
publisher
SAGE Publications Inc.
external identifiers
  • scopus:58149379393
ISSN
0959-6836
DOI
10.1177/0959683608091783
language
English
LU publication?
no
id
4ca31a92-26df-48fa-83e0-bd9f360c8b9b (old id 2440029)
alternative location
http://hol.sagepub.com/content/18/5/715.abstract
date added to LUP
2012-05-21 15:47:07
date last changed
2017-07-09 03:39:00
@article{4ca31a92-26df-48fa-83e0-bd9f360c8b9b,
  abstract     = {Surface samples from Vancouver Island, Canada, were used to assess the relationship between discrete seasonal temperate rainforest (STR) plant communities and their corresponding pollen signatures. Pollen from ten sediment cores was further used to evaluate the postglacial development of these communities. Principal components analysis (PCA) of the surface data revealed the distinctiveness of the modern pollen rain, with samples from the Coastal Douglas Fir (CDF) zone, the dry Coastal Western Hemlock (CWH) zone, the wet CWH subzones and the Mountain Hemlock (MH) zone clustering distinctly. PCA of the fossil data revealed early-seral open canopy, wet rainforest, subalpine rainforest and Lateglacial plant associations and showed that the STR has changed markedly through time. Pinus woodlands with low palynological richness prevailed in the early Lateglacial period, only to be supplanted by mixed conifer forest with increased pollen richness. In the early Holocene, STR vegetation differentiated spatially as early-seral open canopy forests expanded, though a non-analogue Picea-dominated forest persisted on the moist outer coast. Generally high pollen richness is attributed to the expansion of dryland habitat coupled with the development of a fire-maintained vegetation mosaic. In the mid- and late-Holocene intervals, open canopy communities persisted in eastern areas, eventually developing into modern CDF and dry CWH forest. In contrast, moist and oceanic CWH rainforest developed on central and western Vancouver Island, whereas subalpine forest established at high elevation. Pollen richness declined in the mid Holocene concomitant with increased precipitation and a general reduction in the incidence of fire, though this trend was offset somewhat in the late Holocene by paludification.},
  author       = {Brown, K. J. and Nielsen, Anne Birgitte and Fitton, R. J. and Hebda, R. J.},
  issn         = {0959-6836},
  keyword      = {vegetation history,pollen analysis,temperate rainforest,surface samples,Holocene,British Columbia,Canada},
  language     = {eng},
  number       = {5},
  pages        = {715--727},
  publisher    = {SAGE Publications Inc.},
  series       = {The Holocene},
  title        = {Postglacial evolution and spatial differentiation of seasonal temperate rainforest in western Canada},
  url          = {http://dx.doi.org/10.1177/0959683608091783},
  volume       = {18},
  year         = {2008},
}