Reindeer control over shrubification in subarctic wetlands: spatial analysis based on unoccupied aerial vehicle imagery
Abstract Herbivores can exert a controlling effect on the reproduction and growth of shrubs, thereby counter‐acting the climate‐driven encroachment of shrubs in the Arctic and the potential consequences. This control is particularly evident in the case of abundant herbivores, such as reindeer (Rangi...
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ftdoajarticles:oai:doaj.org/article:d24fc3b983c24c19b41da20233abd9ca 2023-11-12T04:10:29+01:00 Reindeer control over shrubification in subarctic wetlands: spatial analysis based on unoccupied aerial vehicle imagery Miguel Villoslada Henni Ylänne Sari Juutinen Tiina H. M. Kolari Pasi Korpelainen Teemu Tahvanainen Franziska Wolff Timo Kumpula 2023-10-01T00:00:00Z https://doi.org/10.1002/rse2.337 https://doaj.org/article/d24fc3b983c24c19b41da20233abd9ca EN eng Wiley https://doi.org/10.1002/rse2.337 https://doaj.org/toc/2056-3485 2056-3485 doi:10.1002/rse2.337 https://doaj.org/article/d24fc3b983c24c19b41da20233abd9ca Remote Sensing in Ecology and Conservation, Vol 9, Iss 5, Pp 687-706 (2023) Arctic greening fens herbivory shrubification UAV Technology T Ecology QH540-549.5 article 2023 ftdoajarticles https://doi.org/10.1002/rse2.337 2023-10-29T00:38:58Z Abstract Herbivores can exert a controlling effect on the reproduction and growth of shrubs, thereby counter‐acting the climate‐driven encroachment of shrubs in the Arctic and the potential consequences. This control is particularly evident in the case of abundant herbivores, such as reindeer (Rangifer tarandus tarandus), whose grazing patterns are affected by management. Here, we tested how different reindeer grazing practices on the border between Finland and Norway impact the occurrence of willow (Salix spp.) dominated patches, their above‐ground biomass (AGB) and the ability of willows to form dense thickets. We used a combination of multispectral and RGB imagery obtained from unoccupied aerial vehicles field data and an ensemble of machine‐learning models, which allowed us to model the occurrence of plant community types (Overall accuracy = 0.80), AGB fractions (maximum R2 = 0.90) and topsoil moisture (maximum R2 = 0.89). With this combination of approaches, we show that willows are kept in a browsing‐trap under spring and early summer grazing by reindeer, growing mostly small and scattered in the landscape. In contrast, willows under the winter grazing regime formed dense stands, particularly within riparian areas. We confirm this pattern using a random forest willow habitat distribution model based on topographical parameters. The model shows that willow biomass correlated with parameters of optimal habitat quality only in the winter grazing regime and did not respond to the same parameters under spring and summer grazing of reindeer. Article in Journal/Newspaper Arctic Greening Arctic Rangifer tarandus Subarctic Directory of Open Access Journals: DOAJ Articles Remote Sensing in Ecology and Conservation 9 5 687 706 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Arctic greening fens herbivory shrubification UAV Technology T Ecology QH540-549.5 |
spellingShingle |
Arctic greening fens herbivory shrubification UAV Technology T Ecology QH540-549.5 Miguel Villoslada Henni Ylänne Sari Juutinen Tiina H. M. Kolari Pasi Korpelainen Teemu Tahvanainen Franziska Wolff Timo Kumpula Reindeer control over shrubification in subarctic wetlands: spatial analysis based on unoccupied aerial vehicle imagery |
topic_facet |
Arctic greening fens herbivory shrubification UAV Technology T Ecology QH540-549.5 |
description |
Abstract Herbivores can exert a controlling effect on the reproduction and growth of shrubs, thereby counter‐acting the climate‐driven encroachment of shrubs in the Arctic and the potential consequences. This control is particularly evident in the case of abundant herbivores, such as reindeer (Rangifer tarandus tarandus), whose grazing patterns are affected by management. Here, we tested how different reindeer grazing practices on the border between Finland and Norway impact the occurrence of willow (Salix spp.) dominated patches, their above‐ground biomass (AGB) and the ability of willows to form dense thickets. We used a combination of multispectral and RGB imagery obtained from unoccupied aerial vehicles field data and an ensemble of machine‐learning models, which allowed us to model the occurrence of plant community types (Overall accuracy = 0.80), AGB fractions (maximum R2 = 0.90) and topsoil moisture (maximum R2 = 0.89). With this combination of approaches, we show that willows are kept in a browsing‐trap under spring and early summer grazing by reindeer, growing mostly small and scattered in the landscape. In contrast, willows under the winter grazing regime formed dense stands, particularly within riparian areas. We confirm this pattern using a random forest willow habitat distribution model based on topographical parameters. The model shows that willow biomass correlated with parameters of optimal habitat quality only in the winter grazing regime and did not respond to the same parameters under spring and summer grazing of reindeer. |
format |
Article in Journal/Newspaper |
author |
Miguel Villoslada Henni Ylänne Sari Juutinen Tiina H. M. Kolari Pasi Korpelainen Teemu Tahvanainen Franziska Wolff Timo Kumpula |
author_facet |
Miguel Villoslada Henni Ylänne Sari Juutinen Tiina H. M. Kolari Pasi Korpelainen Teemu Tahvanainen Franziska Wolff Timo Kumpula |
author_sort |
Miguel Villoslada |
title |
Reindeer control over shrubification in subarctic wetlands: spatial analysis based on unoccupied aerial vehicle imagery |
title_short |
Reindeer control over shrubification in subarctic wetlands: spatial analysis based on unoccupied aerial vehicle imagery |
title_full |
Reindeer control over shrubification in subarctic wetlands: spatial analysis based on unoccupied aerial vehicle imagery |
title_fullStr |
Reindeer control over shrubification in subarctic wetlands: spatial analysis based on unoccupied aerial vehicle imagery |
title_full_unstemmed |
Reindeer control over shrubification in subarctic wetlands: spatial analysis based on unoccupied aerial vehicle imagery |
title_sort |
reindeer control over shrubification in subarctic wetlands: spatial analysis based on unoccupied aerial vehicle imagery |
publisher |
Wiley |
publishDate |
2023 |
url |
https://doi.org/10.1002/rse2.337 https://doaj.org/article/d24fc3b983c24c19b41da20233abd9ca |
genre |
Arctic Greening Arctic Rangifer tarandus Subarctic |
genre_facet |
Arctic Greening Arctic Rangifer tarandus Subarctic |
op_source |
Remote Sensing in Ecology and Conservation, Vol 9, Iss 5, Pp 687-706 (2023) |
op_relation |
https://doi.org/10.1002/rse2.337 https://doaj.org/toc/2056-3485 2056-3485 doi:10.1002/rse2.337 https://doaj.org/article/d24fc3b983c24c19b41da20233abd9ca |
op_doi |
https://doi.org/10.1002/rse2.337 |
container_title |
Remote Sensing in Ecology and Conservation |
container_volume |
9 |
container_issue |
5 |
container_start_page |
687 |
op_container_end_page |
706 |
_version_ |
1782329923291054080 |