Spruce-seedbed interactions : is there facilitation of recruitment in the boreal forest-alpine tundra ecotone? (Mealy mountains, Labrador, Canada)
Thesis (M.Sc.)--Memorial University of Newfoundland, 2009. Biology Includes bibliographical references As climates warm, black spruce (Picea mariana) is expected to expand its range into alpine tundra. Ecological factors such as seedbed and prédation may influence recruitment on regional scales. In...
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ftmemorialunivdc:oai:collections.mun.ca:theses4/155476 2023-05-15T17:23:34+02:00 Spruce-seedbed interactions : is there facilitation of recruitment in the boreal forest-alpine tundra ecotone? (Mealy mountains, Labrador, Canada) Wheeler, Julia A. C., 1985- Memorial University of Newfoundland. Dept. of Biology Canada--Newfoundland and Labrador--Labrador; 2009 v, 83 leaves : ill. Image/jpeg; Application/pdf http://collections.mun.ca/cdm/ref/collection/theses4/id/155476 Eng eng Electronic Theses and Dissertations (10.10 MB) -- http://collections.mun.ca/PDFs/theses/Wheeler_JuliaAC.pdf a3289181 http://collections.mun.ca/cdm/ref/collection/theses4/id/155476 The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries Black spruce--Effect of global warming on--Newfoundland and Labrador--Labrador Black spruce--Newfoundland and Labrador--Labrador--Seedlings Ecotones--Newfoundland and Labrador--Labrador Forest soils--Newfoundland and Labrador--Labrador Soil seed banks--Newfoundland and Labrador--Labrador Text Electronic thesis or dissertation 2009 ftmemorialunivdc 2015-08-06T19:22:38Z Thesis (M.Sc.)--Memorial University of Newfoundland, 2009. Biology Includes bibliographical references As climates warm, black spruce (Picea mariana) is expected to expand its range into alpine tundra. Ecological factors such as seedbed and prédation may influence recruitment on regional scales. In the boreal forest, seedbed-seedling competition dominates but in the climatically-stressed Mealy Mountains forest-tundra ecotone (Labrador, Canada) the Stress Gradient Hypothesis (SGH) predicts facilitation as the dominant plant interaction. We investigated mechanisms of seedbed facilitation (temperature, water, nutrients, physical structure) in Pleurozium schreberi, Cladina spp., and mineral soil, and examined links between prédation and seedbed. Pleurozium seedbeds had strong positive effects on seedling growth (30.9%) and survival (55%). Conversely, seedlings recruited poorly on mineral soil, with lowest growth (20.5%) and survival (26%). Seed emergence was highest on Pleurozium (6.3%), and lowest on Cladina (0.3%). The physical structure of Pleurozium likely protects seedlings from exposure, temperatures extremes and predators. As climates warm and seed availability increases, Pleurozium may facilitate black spruce expansion. Thesis Newfoundland studies Tundra University of Newfoundland Memorial University of Newfoundland: Digital Archives Initiative (DAI) Newfoundland Canada Mealy Mountains ENVELOPE(-59.465,-59.465,53.383,53.383) |
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Open Polar |
collection |
Memorial University of Newfoundland: Digital Archives Initiative (DAI) |
op_collection_id |
ftmemorialunivdc |
language |
English |
topic |
Black spruce--Effect of global warming on--Newfoundland and Labrador--Labrador Black spruce--Newfoundland and Labrador--Labrador--Seedlings Ecotones--Newfoundland and Labrador--Labrador Forest soils--Newfoundland and Labrador--Labrador Soil seed banks--Newfoundland and Labrador--Labrador |
spellingShingle |
Black spruce--Effect of global warming on--Newfoundland and Labrador--Labrador Black spruce--Newfoundland and Labrador--Labrador--Seedlings Ecotones--Newfoundland and Labrador--Labrador Forest soils--Newfoundland and Labrador--Labrador Soil seed banks--Newfoundland and Labrador--Labrador Wheeler, Julia A. C., 1985- Spruce-seedbed interactions : is there facilitation of recruitment in the boreal forest-alpine tundra ecotone? (Mealy mountains, Labrador, Canada) |
topic_facet |
Black spruce--Effect of global warming on--Newfoundland and Labrador--Labrador Black spruce--Newfoundland and Labrador--Labrador--Seedlings Ecotones--Newfoundland and Labrador--Labrador Forest soils--Newfoundland and Labrador--Labrador Soil seed banks--Newfoundland and Labrador--Labrador |
description |
Thesis (M.Sc.)--Memorial University of Newfoundland, 2009. Biology Includes bibliographical references As climates warm, black spruce (Picea mariana) is expected to expand its range into alpine tundra. Ecological factors such as seedbed and prédation may influence recruitment on regional scales. In the boreal forest, seedbed-seedling competition dominates but in the climatically-stressed Mealy Mountains forest-tundra ecotone (Labrador, Canada) the Stress Gradient Hypothesis (SGH) predicts facilitation as the dominant plant interaction. We investigated mechanisms of seedbed facilitation (temperature, water, nutrients, physical structure) in Pleurozium schreberi, Cladina spp., and mineral soil, and examined links between prédation and seedbed. Pleurozium seedbeds had strong positive effects on seedling growth (30.9%) and survival (55%). Conversely, seedlings recruited poorly on mineral soil, with lowest growth (20.5%) and survival (26%). Seed emergence was highest on Pleurozium (6.3%), and lowest on Cladina (0.3%). The physical structure of Pleurozium likely protects seedlings from exposure, temperatures extremes and predators. As climates warm and seed availability increases, Pleurozium may facilitate black spruce expansion. |
author2 |
Memorial University of Newfoundland. Dept. of Biology |
format |
Thesis |
author |
Wheeler, Julia A. C., 1985- |
author_facet |
Wheeler, Julia A. C., 1985- |
author_sort |
Wheeler, Julia A. C., 1985- |
title |
Spruce-seedbed interactions : is there facilitation of recruitment in the boreal forest-alpine tundra ecotone? (Mealy mountains, Labrador, Canada) |
title_short |
Spruce-seedbed interactions : is there facilitation of recruitment in the boreal forest-alpine tundra ecotone? (Mealy mountains, Labrador, Canada) |
title_full |
Spruce-seedbed interactions : is there facilitation of recruitment in the boreal forest-alpine tundra ecotone? (Mealy mountains, Labrador, Canada) |
title_fullStr |
Spruce-seedbed interactions : is there facilitation of recruitment in the boreal forest-alpine tundra ecotone? (Mealy mountains, Labrador, Canada) |
title_full_unstemmed |
Spruce-seedbed interactions : is there facilitation of recruitment in the boreal forest-alpine tundra ecotone? (Mealy mountains, Labrador, Canada) |
title_sort |
spruce-seedbed interactions : is there facilitation of recruitment in the boreal forest-alpine tundra ecotone? (mealy mountains, labrador, canada) |
publishDate |
2009 |
url |
http://collections.mun.ca/cdm/ref/collection/theses4/id/155476 |
op_coverage |
Canada--Newfoundland and Labrador--Labrador; |
long_lat |
ENVELOPE(-59.465,-59.465,53.383,53.383) |
geographic |
Newfoundland Canada Mealy Mountains |
geographic_facet |
Newfoundland Canada Mealy Mountains |
genre |
Newfoundland studies Tundra University of Newfoundland |
genre_facet |
Newfoundland studies Tundra University of Newfoundland |
op_source |
Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries |
op_relation |
Electronic Theses and Dissertations (10.10 MB) -- http://collections.mun.ca/PDFs/theses/Wheeler_JuliaAC.pdf a3289181 http://collections.mun.ca/cdm/ref/collection/theses4/id/155476 |
op_rights |
The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. |
_version_ |
1766113335895392256 |