Tundra plants across spatial scales : new insights into drivers of high-latitude vegetation patterns
Tundra ecosystems are globally under a threat due to climate warming that has been projected to be up to four times stronger in the high-latitude regions than the global average, even though direct human impacts are lesser in these remote areas than elsewhere. Additionally, climate at high latitudes...
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2023
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/357694 2023-09-05T13:17:17+02:00 Tundra plants across spatial scales : new insights into drivers of high-latitude vegetation patterns Rissanen, Tuuli Graae, Bente Jessen University of Helsinki, Faculty of Science, Department of geosciences and geography Doctoral Programme in Geosciences Helsingin yliopisto, matemaattis-luonnontieteellinen tiedekunta Geotieteiden tohtoriohjelma Helsingfors universitet, matematisk-naturvetenskapliga fakulteten Doktorandprogrammet i geovetenskap Luoto, Miska Soininen, Janne 2023-05-10T06:41:27Z application/pdf http://hdl.handle.net/10138/357694 eng eng Helsingin yliopisto Helsingfors universitet University of Helsinki URN:ISBN:978-951-51-8153-4 Painosalama, Turku: 2023, Department of Geosciences and Geography A. 1798-7911 URN:ISSN:1798-7911 URN:ISBN:978-951-51-8154-1 http://hdl.handle.net/10138/357694 Julkaisu on tekijänoikeussäännösten alainen. Teosta voi lukea ja tulostaa henkilökohtaista käyttöä varten. Käyttö kaupallisiin tarkoituksiin on kielletty. This publication is copyrighted. You may download, display and print it for Your own personal use. Commercial use is prohibited. Publikationen är skyddad av upphovsrätten. Den får läsas och skrivas ut för personligt bruk. Användning i kommersiellt syfte är förbjuden. maantiede Text 1171 Geotieteet 1171 Geovetenskaper 1171 Geosciences Doctoral dissertation (article-based) Artikkeliväitöskirja Artikelavhandling doctoralThesis 2023 ftunivhelsihelda 2023-08-16T23:00:14Z Tundra ecosystems are globally under a threat due to climate warming that has been projected to be up to four times stronger in the high-latitude regions than the global average, even though direct human impacts are lesser in these remote areas than elsewhere. Additionally, climate at high latitudes is predicted to shift from snow- towards rain-dominated. Changes in cryospheric, that is, snow- and frost-related, conditions might be particularly important as they would alter freeze and thaw cycling and the related processes posing a great extinction threat to snow- dependent and stress-tolerant arctic-alpine species. Decline in species´ ranges as well as changes in community composition and diversity are expected, which will reflect to ecosystem processes. In this thesis, I study drivers of species distributions, occupancy, community functional and phylogenetic composition and diversity of vascular plants in the high-latitude areas of the northern hemisphere focusing on the arctic-alpine region of Fennoscandia, northern Europe. The relationships between vegetation patterns and their drivers are explored at multiple spatial scales using various statistical modelling methods widely applied in biogeography and ecology but expanding the former approaches by considering cryogenic and geomorphologic predictor variables to look beyond the effects of commonly examined climate and soil variables on vegetation. I found that snow information is required when modelling vegetation patterns in cold ecosystems regardless of the study scale and the studied response variable as snow persistence was a highly important predictor for species distributions, community functional composition and diversity. However, contrasting responses may arise depending on the studied taxa, functional property, and diversity facet. Furthermore, study scale can affect the relationship between environment and plant occupancy and community functional composition. Altogether, investigating vegetation patterns at several spatial scales using different ... Doctoral or Postdoctoral Thesis Arctic Fennoscandia Tundra Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto Arctic |
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Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto |
op_collection_id |
ftunivhelsihelda |
language |
English |
topic |
maantiede |
spellingShingle |
maantiede Rissanen, Tuuli Tundra plants across spatial scales : new insights into drivers of high-latitude vegetation patterns |
topic_facet |
maantiede |
description |
Tundra ecosystems are globally under a threat due to climate warming that has been projected to be up to four times stronger in the high-latitude regions than the global average, even though direct human impacts are lesser in these remote areas than elsewhere. Additionally, climate at high latitudes is predicted to shift from snow- towards rain-dominated. Changes in cryospheric, that is, snow- and frost-related, conditions might be particularly important as they would alter freeze and thaw cycling and the related processes posing a great extinction threat to snow- dependent and stress-tolerant arctic-alpine species. Decline in species´ ranges as well as changes in community composition and diversity are expected, which will reflect to ecosystem processes. In this thesis, I study drivers of species distributions, occupancy, community functional and phylogenetic composition and diversity of vascular plants in the high-latitude areas of the northern hemisphere focusing on the arctic-alpine region of Fennoscandia, northern Europe. The relationships between vegetation patterns and their drivers are explored at multiple spatial scales using various statistical modelling methods widely applied in biogeography and ecology but expanding the former approaches by considering cryogenic and geomorphologic predictor variables to look beyond the effects of commonly examined climate and soil variables on vegetation. I found that snow information is required when modelling vegetation patterns in cold ecosystems regardless of the study scale and the studied response variable as snow persistence was a highly important predictor for species distributions, community functional composition and diversity. However, contrasting responses may arise depending on the studied taxa, functional property, and diversity facet. Furthermore, study scale can affect the relationship between environment and plant occupancy and community functional composition. Altogether, investigating vegetation patterns at several spatial scales using different ... |
author2 |
Graae, Bente Jessen University of Helsinki, Faculty of Science, Department of geosciences and geography Doctoral Programme in Geosciences Helsingin yliopisto, matemaattis-luonnontieteellinen tiedekunta Geotieteiden tohtoriohjelma Helsingfors universitet, matematisk-naturvetenskapliga fakulteten Doktorandprogrammet i geovetenskap Luoto, Miska Soininen, Janne |
format |
Doctoral or Postdoctoral Thesis |
author |
Rissanen, Tuuli |
author_facet |
Rissanen, Tuuli |
author_sort |
Rissanen, Tuuli |
title |
Tundra plants across spatial scales : new insights into drivers of high-latitude vegetation patterns |
title_short |
Tundra plants across spatial scales : new insights into drivers of high-latitude vegetation patterns |
title_full |
Tundra plants across spatial scales : new insights into drivers of high-latitude vegetation patterns |
title_fullStr |
Tundra plants across spatial scales : new insights into drivers of high-latitude vegetation patterns |
title_full_unstemmed |
Tundra plants across spatial scales : new insights into drivers of high-latitude vegetation patterns |
title_sort |
tundra plants across spatial scales : new insights into drivers of high-latitude vegetation patterns |
publisher |
Helsingin yliopisto |
publishDate |
2023 |
url |
http://hdl.handle.net/10138/357694 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Fennoscandia Tundra |
genre_facet |
Arctic Fennoscandia Tundra |
op_relation |
URN:ISBN:978-951-51-8153-4 Painosalama, Turku: 2023, Department of Geosciences and Geography A. 1798-7911 URN:ISSN:1798-7911 URN:ISBN:978-951-51-8154-1 http://hdl.handle.net/10138/357694 |
op_rights |
Julkaisu on tekijänoikeussäännösten alainen. Teosta voi lukea ja tulostaa henkilökohtaista käyttöä varten. Käyttö kaupallisiin tarkoituksiin on kielletty. This publication is copyrighted. You may download, display and print it for Your own personal use. Commercial use is prohibited. Publikationen är skyddad av upphovsrätten. Den får läsas och skrivas ut för personligt bruk. Användning i kommersiellt syfte är förbjuden. |
_version_ |
1776198511111438336 |