Muskoxen Modify Plant Abundance, Phenology, and Nitrogen Dynamics in a High Arctic Fen
Herbivores are key drivers of vegetation dynamics in most ecosystems. However, the effect of high arctic herbivores on vegetation dynamics throughout a growing season is not well understood. In this study, we examine the impacts of a large dominant herbivore in the tundra ecosystem, the muskox, Ovib...
Published in: | Ecosystems |
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Language: | English |
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2019
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Online Access: | https://pure.au.dk/portal/en/publications/5fa4420c-bb38-4dd3-a72c-886b210254c6 https://doi.org/10.1007/s10021-018-0323-4 http://www.scopus.com/inward/record.url?scp=85058061860&partnerID=8YFLogxK |
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ftuniaarhuspubl:oai:pure.atira.dk:publications/5fa4420c-bb38-4dd3-a72c-886b210254c6 2024-02-11T09:59:29+01:00 Muskoxen Modify Plant Abundance, Phenology, and Nitrogen Dynamics in a High Arctic Fen Mosbacher, Jesper Bruun Michelsen, Anders Stelvig, Mikkel Hjermstad-Sollerud, Håvard Schmidt, Niels Martin 2019-08 https://pure.au.dk/portal/en/publications/5fa4420c-bb38-4dd3-a72c-886b210254c6 https://doi.org/10.1007/s10021-018-0323-4 http://www.scopus.com/inward/record.url?scp=85058061860&partnerID=8YFLogxK eng eng https://pure.au.dk/portal/en/publications/5fa4420c-bb38-4dd3-a72c-886b210254c6 info:eu-repo/semantics/restrictedAccess Mosbacher , J B , Michelsen , A , Stelvig , M , Hjermstad-Sollerud , H & Schmidt , N M 2019 , ' Muskoxen Modify Plant Abundance, Phenology, and Nitrogen Dynamics in a High Arctic Fen ' , Ecosystems , vol. 22 , no. 5 , pp. 1095–1107 . https://doi.org/10.1007/s10021-018-0323-4 Ovibos moschatus Zackenberg biomass exclosures grazing herbivore nitrogen pools trampling tundra article 2019 ftuniaarhuspubl https://doi.org/10.1007/s10021-018-0323-4 2024-01-18T00:00:00Z Herbivores are key drivers of vegetation dynamics in most ecosystems. However, the effect of high arctic herbivores on vegetation dynamics throughout a growing season is not well understood. In this study, we examine the impacts of a large dominant herbivore in the tundra ecosystem, the muskox, Ovibos moschatus, using exclosures established in a fen in high Arctic Greenland. Using weekly sampling throughout the growing season, we quantified the effects of muskox exclusion on aboveground plant biomass and on concentrations and pools of carbon and nitrogen, and explored the timing of peak biomass and nutrient pools. Excluding muskoxen profoundly changed plant abundances and dynamics of the fen, with more than a doubling of aboveground plant biomass and carbon and nitrogen pool sizes. Specifically, large increases in mosses and litter were observed, while graminoid biomass did not change significantly with exclusion of muskoxen. Excluding muskoxen advanced the peak of plant biomass, but also led to a more rapid decline, resulting in an earlier and shorter period of maximal plant biomass inside the exclosures. The largest impact of muskoxen on the arctic fen ecosystem seems to be through their trampling effects on the moss layer, which likely mediated most of the observed changes. This study demonstrates how quickly an ecosystem may respond to changes in the abundance of large herbivores and highlights their pivotal role in modifying vegetation dynamics and nutrient cycling in tundra ecosystems. Article in Journal/Newspaper Arctic Arctic Greenland muskox ovibos moschatus Tundra Zackenberg Aarhus University: Research Arctic Greenland Ecosystems 22 5 1095 1107 |
institution |
Open Polar |
collection |
Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
language |
English |
topic |
Ovibos moschatus Zackenberg biomass exclosures grazing herbivore nitrogen pools trampling tundra |
spellingShingle |
Ovibos moschatus Zackenberg biomass exclosures grazing herbivore nitrogen pools trampling tundra Mosbacher, Jesper Bruun Michelsen, Anders Stelvig, Mikkel Hjermstad-Sollerud, Håvard Schmidt, Niels Martin Muskoxen Modify Plant Abundance, Phenology, and Nitrogen Dynamics in a High Arctic Fen |
topic_facet |
Ovibos moschatus Zackenberg biomass exclosures grazing herbivore nitrogen pools trampling tundra |
description |
Herbivores are key drivers of vegetation dynamics in most ecosystems. However, the effect of high arctic herbivores on vegetation dynamics throughout a growing season is not well understood. In this study, we examine the impacts of a large dominant herbivore in the tundra ecosystem, the muskox, Ovibos moschatus, using exclosures established in a fen in high Arctic Greenland. Using weekly sampling throughout the growing season, we quantified the effects of muskox exclusion on aboveground plant biomass and on concentrations and pools of carbon and nitrogen, and explored the timing of peak biomass and nutrient pools. Excluding muskoxen profoundly changed plant abundances and dynamics of the fen, with more than a doubling of aboveground plant biomass and carbon and nitrogen pool sizes. Specifically, large increases in mosses and litter were observed, while graminoid biomass did not change significantly with exclusion of muskoxen. Excluding muskoxen advanced the peak of plant biomass, but also led to a more rapid decline, resulting in an earlier and shorter period of maximal plant biomass inside the exclosures. The largest impact of muskoxen on the arctic fen ecosystem seems to be through their trampling effects on the moss layer, which likely mediated most of the observed changes. This study demonstrates how quickly an ecosystem may respond to changes in the abundance of large herbivores and highlights their pivotal role in modifying vegetation dynamics and nutrient cycling in tundra ecosystems. |
format |
Article in Journal/Newspaper |
author |
Mosbacher, Jesper Bruun Michelsen, Anders Stelvig, Mikkel Hjermstad-Sollerud, Håvard Schmidt, Niels Martin |
author_facet |
Mosbacher, Jesper Bruun Michelsen, Anders Stelvig, Mikkel Hjermstad-Sollerud, Håvard Schmidt, Niels Martin |
author_sort |
Mosbacher, Jesper Bruun |
title |
Muskoxen Modify Plant Abundance, Phenology, and Nitrogen Dynamics in a High Arctic Fen |
title_short |
Muskoxen Modify Plant Abundance, Phenology, and Nitrogen Dynamics in a High Arctic Fen |
title_full |
Muskoxen Modify Plant Abundance, Phenology, and Nitrogen Dynamics in a High Arctic Fen |
title_fullStr |
Muskoxen Modify Plant Abundance, Phenology, and Nitrogen Dynamics in a High Arctic Fen |
title_full_unstemmed |
Muskoxen Modify Plant Abundance, Phenology, and Nitrogen Dynamics in a High Arctic Fen |
title_sort |
muskoxen modify plant abundance, phenology, and nitrogen dynamics in a high arctic fen |
publishDate |
2019 |
url |
https://pure.au.dk/portal/en/publications/5fa4420c-bb38-4dd3-a72c-886b210254c6 https://doi.org/10.1007/s10021-018-0323-4 http://www.scopus.com/inward/record.url?scp=85058061860&partnerID=8YFLogxK |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Arctic Greenland muskox ovibos moschatus Tundra Zackenberg |
genre_facet |
Arctic Arctic Greenland muskox ovibos moschatus Tundra Zackenberg |
op_source |
Mosbacher , J B , Michelsen , A , Stelvig , M , Hjermstad-Sollerud , H & Schmidt , N M 2019 , ' Muskoxen Modify Plant Abundance, Phenology, and Nitrogen Dynamics in a High Arctic Fen ' , Ecosystems , vol. 22 , no. 5 , pp. 1095–1107 . https://doi.org/10.1007/s10021-018-0323-4 |
op_relation |
https://pure.au.dk/portal/en/publications/5fa4420c-bb38-4dd3-a72c-886b210254c6 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1007/s10021-018-0323-4 |
container_title |
Ecosystems |
container_volume |
22 |
container_issue |
5 |
container_start_page |
1095 |
op_container_end_page |
1107 |
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1790595372358303744 |