The role of herbivores in mediating responses of tundra ecosystems to climate change
The Arctic areas are warming more rapidly than other parts of the world. Increasing temperatures are predicted to result in shrubification, higher productivity, declining species diversity and new species invasions to the tundra. Changes in species diversity and plant community composition are likel...
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Umeå universitet, Institutionen för ekologi, miljö och geovetenskap
2014
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ftumeauniv:oai:DiVA.org:umu-85208 2023-10-09T21:48:55+02:00 The role of herbivores in mediating responses of tundra ecosystems to climate change Kaarlejärvi, Elina 2014 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-85208 eng eng Umeå universitet, Institutionen för ekologi, miljö och geovetenskap Umeå : Umeå universitet http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-85208 urn:isbn:978-91-7459-782-0 info:eu-repo/semantics/openAccess Climate change warming grazer Rangifer Lemmus lemmus species distribution biotic interactions altitude Ecology Ekologi Doctoral thesis, comprehensive summary info:eu-repo/semantics/doctoralThesis text 2014 ftumeauniv 2023-09-22T13:49:22Z The Arctic areas are warming more rapidly than other parts of the world. Increasing temperatures are predicted to result in shrubification, higher productivity, declining species diversity and new species invasions to the tundra. Changes in species diversity and plant community composition are likely to alter ecosystem functions with potential consequences for human population also at lower latitudes. Thus, in order to better predict the effects of the rapid arctic warming, we need knowledge on how plant communities respond to a warmer climate. Here, I investigate the effects of climate warming on tundra plant communities and focus on the role of mammalian herbivores in mediating these responses. I examined the role of herbivores by incorporating herbivore manipulations to short- and long-term warming experiments as well as along altitudinal gradients. I measured how individual plants and plant communities respond to warming with and without herbivores. Results of my PhD Thesis illustrate several ways how herbivores modify the responses of plants to warming. I found that herbivores (reindeer, hare, voles, lemmings) may prevent lowland forbs from invading open tundra. Herbivores might also protect small tundra forbs from being outcompeted by taller and denser vegetation under climate warming. Thus, different herbivore pressures may lead to differing plant abundances and distribution shifts in different areas. Furthermore, my results show that high herbivore pressure can reverse the effects of long-term climate warming very rapidly, even in one year. This finding suggests that well-planned targeted reindeer grazing episodes could potentially be used as a conservation tool to keep selected tundra habitats open. Sudden cessation of grazing may initiate rapid changes in plant community, especially if it coincides with warm temperatures. Taken together, I show that herbivores counteract the effects of climate warming by slowing down or preventing vegetation changes in tundra. Therefore, it is important to consider ... Doctoral or Postdoctoral Thesis Arctic Climate change Lemmus lemmus Tundra Umeå University: Publications (DiVA) Arctic |
institution |
Open Polar |
collection |
Umeå University: Publications (DiVA) |
op_collection_id |
ftumeauniv |
language |
English |
topic |
Climate change warming grazer Rangifer Lemmus lemmus species distribution biotic interactions altitude Ecology Ekologi |
spellingShingle |
Climate change warming grazer Rangifer Lemmus lemmus species distribution biotic interactions altitude Ecology Ekologi Kaarlejärvi, Elina The role of herbivores in mediating responses of tundra ecosystems to climate change |
topic_facet |
Climate change warming grazer Rangifer Lemmus lemmus species distribution biotic interactions altitude Ecology Ekologi |
description |
The Arctic areas are warming more rapidly than other parts of the world. Increasing temperatures are predicted to result in shrubification, higher productivity, declining species diversity and new species invasions to the tundra. Changes in species diversity and plant community composition are likely to alter ecosystem functions with potential consequences for human population also at lower latitudes. Thus, in order to better predict the effects of the rapid arctic warming, we need knowledge on how plant communities respond to a warmer climate. Here, I investigate the effects of climate warming on tundra plant communities and focus on the role of mammalian herbivores in mediating these responses. I examined the role of herbivores by incorporating herbivore manipulations to short- and long-term warming experiments as well as along altitudinal gradients. I measured how individual plants and plant communities respond to warming with and without herbivores. Results of my PhD Thesis illustrate several ways how herbivores modify the responses of plants to warming. I found that herbivores (reindeer, hare, voles, lemmings) may prevent lowland forbs from invading open tundra. Herbivores might also protect small tundra forbs from being outcompeted by taller and denser vegetation under climate warming. Thus, different herbivore pressures may lead to differing plant abundances and distribution shifts in different areas. Furthermore, my results show that high herbivore pressure can reverse the effects of long-term climate warming very rapidly, even in one year. This finding suggests that well-planned targeted reindeer grazing episodes could potentially be used as a conservation tool to keep selected tundra habitats open. Sudden cessation of grazing may initiate rapid changes in plant community, especially if it coincides with warm temperatures. Taken together, I show that herbivores counteract the effects of climate warming by slowing down or preventing vegetation changes in tundra. Therefore, it is important to consider ... |
format |
Doctoral or Postdoctoral Thesis |
author |
Kaarlejärvi, Elina |
author_facet |
Kaarlejärvi, Elina |
author_sort |
Kaarlejärvi, Elina |
title |
The role of herbivores in mediating responses of tundra ecosystems to climate change |
title_short |
The role of herbivores in mediating responses of tundra ecosystems to climate change |
title_full |
The role of herbivores in mediating responses of tundra ecosystems to climate change |
title_fullStr |
The role of herbivores in mediating responses of tundra ecosystems to climate change |
title_full_unstemmed |
The role of herbivores in mediating responses of tundra ecosystems to climate change |
title_sort |
role of herbivores in mediating responses of tundra ecosystems to climate change |
publisher |
Umeå universitet, Institutionen för ekologi, miljö och geovetenskap |
publishDate |
2014 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-85208 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Climate change Lemmus lemmus Tundra |
genre_facet |
Arctic Climate change Lemmus lemmus Tundra |
op_relation |
http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-85208 urn:isbn:978-91-7459-782-0 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1779311979641438208 |