Ground ice melt in the high Arctic leads to greater ecological heterogeneity
Summary The polar desert biome of the Canadian high Arctic Archipelago is currently experiencing some of the greatest mean annual air temperature increases on the planet, threatening the stability of ecosystems residing above temperature‐sensitive permafrost. Ice wedges are the most widespread form...
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crwiley:10.1111/1365-2745.12491 2024-10-13T14:03:58+00:00 Ground ice melt in the high Arctic leads to greater ecological heterogeneity Becker, Michael S. Davies, T. Jonathan Pollard, Wayne H. Cornelissen, Hans Fonds de Recherche du Québec - Nature et Technologies Environment Canada Natural Sciences and Engineering Research Council of Canada ArcticNet 2015 http://dx.doi.org/10.1111/1365-2745.12491 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2F1365-2745.12491 https://besjournals.onlinelibrary.wiley.com/doi/pdf/10.1111/1365-2745.12491 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Ecology volume 104, issue 1, page 114-124 ISSN 0022-0477 1365-2745 journal-article 2015 crwiley https://doi.org/10.1111/1365-2745.12491 2024-09-17T04:47:27Z Summary The polar desert biome of the Canadian high Arctic Archipelago is currently experiencing some of the greatest mean annual air temperature increases on the planet, threatening the stability of ecosystems residing above temperature‐sensitive permafrost. Ice wedges are the most widespread form of ground ice, occurring in up to 25% of the world's terrestrial near‐surface, and their melting (thermokarst) may catalyse a suite of biotic and ecological changes, facilitating major ecosystem shifts. These unknown ecosystem shifts raise serious questions as to how permafrost stability, vegetation diversity and edaphic conditions will change with a warming high Arctic. Ecosystem and thermokarst processes tend to be examined independently, limiting our understanding of a coupled system whereby the effect of climate change on one will affect the outcome of the other. Using in‐depth, comprehensive field observations and a space‐for‐time approach, we investigate the highly structured landscape that has emerged due to the thermokarst‐induced partitioning of microhabitats. We examine differences in vegetation diversity, community composition and soil conditions on the Fosheim Peninsula, Ellesmere Island, Nunavut. We hypothesize that (i) greater ice wedge subsidence results in increased vegetation cover due to elevated soil moisture, thereby decreasing the seasonal depth of thaw and restricting groundwater outflow; (ii) thermokarst processes result in altered vegetation richness, turnover and dispersion, with greater microhabitat diversity at the landscape scale; and (iii) shifts in hydrology and plant community structure alter soil chemistry. We found that the disturbance caused by melting ice wedges catalysed a suite of environmental and biotic effects: topographical changes, a new hydrological balance, significant species richness and turnover changes, and distinct soil chemistries. Thermokarst areas favour a subset of species unique from the polar desert and are characterized by greater species turnover (β‐diversity) ... Article in Journal/Newspaper Arctic Archipelago Arctic Climate change Ellesmere Island Fosheim Peninsula Ice Nunavut permafrost polar desert Thermokarst wedge* Wiley Online Library Arctic Ellesmere Island Fosheim Peninsula ENVELOPE(-83.749,-83.749,79.669,79.669) Nunavut Journal of Ecology 104 1 114 124 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Summary The polar desert biome of the Canadian high Arctic Archipelago is currently experiencing some of the greatest mean annual air temperature increases on the planet, threatening the stability of ecosystems residing above temperature‐sensitive permafrost. Ice wedges are the most widespread form of ground ice, occurring in up to 25% of the world's terrestrial near‐surface, and their melting (thermokarst) may catalyse a suite of biotic and ecological changes, facilitating major ecosystem shifts. These unknown ecosystem shifts raise serious questions as to how permafrost stability, vegetation diversity and edaphic conditions will change with a warming high Arctic. Ecosystem and thermokarst processes tend to be examined independently, limiting our understanding of a coupled system whereby the effect of climate change on one will affect the outcome of the other. Using in‐depth, comprehensive field observations and a space‐for‐time approach, we investigate the highly structured landscape that has emerged due to the thermokarst‐induced partitioning of microhabitats. We examine differences in vegetation diversity, community composition and soil conditions on the Fosheim Peninsula, Ellesmere Island, Nunavut. We hypothesize that (i) greater ice wedge subsidence results in increased vegetation cover due to elevated soil moisture, thereby decreasing the seasonal depth of thaw and restricting groundwater outflow; (ii) thermokarst processes result in altered vegetation richness, turnover and dispersion, with greater microhabitat diversity at the landscape scale; and (iii) shifts in hydrology and plant community structure alter soil chemistry. We found that the disturbance caused by melting ice wedges catalysed a suite of environmental and biotic effects: topographical changes, a new hydrological balance, significant species richness and turnover changes, and distinct soil chemistries. Thermokarst areas favour a subset of species unique from the polar desert and are characterized by greater species turnover (β‐diversity) ... |
author2 |
Cornelissen, Hans Fonds de Recherche du Québec - Nature et Technologies Environment Canada Natural Sciences and Engineering Research Council of Canada ArcticNet |
format |
Article in Journal/Newspaper |
author |
Becker, Michael S. Davies, T. Jonathan Pollard, Wayne H. |
spellingShingle |
Becker, Michael S. Davies, T. Jonathan Pollard, Wayne H. Ground ice melt in the high Arctic leads to greater ecological heterogeneity |
author_facet |
Becker, Michael S. Davies, T. Jonathan Pollard, Wayne H. |
author_sort |
Becker, Michael S. |
title |
Ground ice melt in the high Arctic leads to greater ecological heterogeneity |
title_short |
Ground ice melt in the high Arctic leads to greater ecological heterogeneity |
title_full |
Ground ice melt in the high Arctic leads to greater ecological heterogeneity |
title_fullStr |
Ground ice melt in the high Arctic leads to greater ecological heterogeneity |
title_full_unstemmed |
Ground ice melt in the high Arctic leads to greater ecological heterogeneity |
title_sort |
ground ice melt in the high arctic leads to greater ecological heterogeneity |
publisher |
Wiley |
publishDate |
2015 |
url |
http://dx.doi.org/10.1111/1365-2745.12491 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2F1365-2745.12491 https://besjournals.onlinelibrary.wiley.com/doi/pdf/10.1111/1365-2745.12491 |
long_lat |
ENVELOPE(-83.749,-83.749,79.669,79.669) |
geographic |
Arctic Ellesmere Island Fosheim Peninsula Nunavut |
geographic_facet |
Arctic Ellesmere Island Fosheim Peninsula Nunavut |
genre |
Arctic Archipelago Arctic Climate change Ellesmere Island Fosheim Peninsula Ice Nunavut permafrost polar desert Thermokarst wedge* |
genre_facet |
Arctic Archipelago Arctic Climate change Ellesmere Island Fosheim Peninsula Ice Nunavut permafrost polar desert Thermokarst wedge* |
op_source |
Journal of Ecology volume 104, issue 1, page 114-124 ISSN 0022-0477 1365-2745 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/1365-2745.12491 |
container_title |
Journal of Ecology |
container_volume |
104 |
container_issue |
1 |
container_start_page |
114 |
op_container_end_page |
124 |
_version_ |
1812809140394786816 |