Distribution patterns of sedges in subarctic fens : ecological and phylogenetic perspectives
The objective of this study is to assess current distributional patterns of species within a community, while taking into account species' evolutionary histories, as reflected in their phylogenetic relationships. The hypothesis is that closely related species segregate along environmental gradi...
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ftcanadathes:oai:collectionscanada.gc.ca:QMM.81323 2023-05-15T18:28:12+02:00 Distribution patterns of sedges in subarctic fens : ecological and phylogenetic perspectives Dabros, Anna Master of Science (Department of Plant Science.) 2004 application/pdf http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=81323 en eng McGill University alephsysno: 002187838 proquestno: AAIMR06386 Theses scanned by UMI/ProQuest. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=81323 All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. Cyperaceae -- Québec (Province) -- Schefferville Region -- Geographical distribution Cyperaceae -- Québec (Province) -- Schefferville Region -- Phylogeny Fens -- Québec (Province) -- Schefferville Region Electronic Thesis or Dissertation 2004 ftcanadathes 2014-02-16T01:02:09Z The objective of this study is to assess current distributional patterns of species within a community, while taking into account species' evolutionary histories, as reflected in their phylogenetic relationships. The hypothesis is that closely related species segregate along environmental gradients, either due to historic evolutionary divergence of their niches, or to ecological processes presently occurring within a community. Distribution along environmental gradients was compared to phylogenetic structure of the 27 sedge species (Cyperaceae) growing in the subarctic fen communities of Schefferville, northern Quebec. Field data suggest that within these fens, sedges mostly differentiate along gradients of rooting depth and pH. Species growing in similar (micro)habitats often belong to different taxonomic sedge clades, and species belonging to the same clade usually differentiate on at least one environmental gradient. Further comparison of natural distribution to responses under greenhouse experimental conditions for four selected Carex species suggests that the two relatives in section Limosae differ in their tolerance ranges to environmental conditions due to past evolutionary events, while the two members of section Paniceae differentiate along environmental gradients in nature due to ongoing ecological processes. Thesis Subarctic Theses Canada/Thèses Canada (Library and Archives Canada) |
institution |
Open Polar |
collection |
Theses Canada/Thèses Canada (Library and Archives Canada) |
op_collection_id |
ftcanadathes |
language |
English |
topic |
Cyperaceae -- Québec (Province) -- Schefferville Region -- Geographical distribution Cyperaceae -- Québec (Province) -- Schefferville Region -- Phylogeny Fens -- Québec (Province) -- Schefferville Region |
spellingShingle |
Cyperaceae -- Québec (Province) -- Schefferville Region -- Geographical distribution Cyperaceae -- Québec (Province) -- Schefferville Region -- Phylogeny Fens -- Québec (Province) -- Schefferville Region Dabros, Anna Distribution patterns of sedges in subarctic fens : ecological and phylogenetic perspectives |
topic_facet |
Cyperaceae -- Québec (Province) -- Schefferville Region -- Geographical distribution Cyperaceae -- Québec (Province) -- Schefferville Region -- Phylogeny Fens -- Québec (Province) -- Schefferville Region |
description |
The objective of this study is to assess current distributional patterns of species within a community, while taking into account species' evolutionary histories, as reflected in their phylogenetic relationships. The hypothesis is that closely related species segregate along environmental gradients, either due to historic evolutionary divergence of their niches, or to ecological processes presently occurring within a community. Distribution along environmental gradients was compared to phylogenetic structure of the 27 sedge species (Cyperaceae) growing in the subarctic fen communities of Schefferville, northern Quebec. Field data suggest that within these fens, sedges mostly differentiate along gradients of rooting depth and pH. Species growing in similar (micro)habitats often belong to different taxonomic sedge clades, and species belonging to the same clade usually differentiate on at least one environmental gradient. Further comparison of natural distribution to responses under greenhouse experimental conditions for four selected Carex species suggests that the two relatives in section Limosae differ in their tolerance ranges to environmental conditions due to past evolutionary events, while the two members of section Paniceae differentiate along environmental gradients in nature due to ongoing ecological processes. |
format |
Thesis |
author |
Dabros, Anna |
author_facet |
Dabros, Anna |
author_sort |
Dabros, Anna |
title |
Distribution patterns of sedges in subarctic fens : ecological and phylogenetic perspectives |
title_short |
Distribution patterns of sedges in subarctic fens : ecological and phylogenetic perspectives |
title_full |
Distribution patterns of sedges in subarctic fens : ecological and phylogenetic perspectives |
title_fullStr |
Distribution patterns of sedges in subarctic fens : ecological and phylogenetic perspectives |
title_full_unstemmed |
Distribution patterns of sedges in subarctic fens : ecological and phylogenetic perspectives |
title_sort |
distribution patterns of sedges in subarctic fens : ecological and phylogenetic perspectives |
publisher |
McGill University |
publishDate |
2004 |
url |
http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=81323 |
op_coverage |
Master of Science (Department of Plant Science.) |
genre |
Subarctic |
genre_facet |
Subarctic |
op_relation |
alephsysno: 002187838 proquestno: AAIMR06386 Theses scanned by UMI/ProQuest. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=81323 |
op_rights |
All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
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1766210587804565504 |