Replication Data for: Long-term homogenization of Fennoscandian heathland and tundra vegetation is connected to the expansion of an allelopathic dwarf shrub

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Maliniemi, Tuija; Kiilunen, Petteri; Bråthen, Kari Anne; Kapfer, Jutta; Bockelie Rosendal, Torunn; Grytnes, John-Arvid; Saccone, Patrick; Virtanen, Risto, 2025, "Replication Data for: Long-term homogenization of Fennoscandian heathland and tundra vegetation is connected to the expansion of an allelopathic dwarf shrub", https://doi.org/10.18710/VYQFPK, DataverseNO, V1

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Description	This dataset contain plant community data (including vascular plants, bryophytes and lichens) from 275 vegetation plots from northern Fennoscandia (northern Finland and northern Norway). Values for each species are percentage cover estimates from 2 x 2 meter plot. Each plot has been surveyed twice, i.e., species have old and new percentage cover from 1964-75 and from 2013-23. We analyzed temporal changes in community composition and diversity across the study area and in different biogeographic zones, continentality-humidity classes and habitat types. We found a strong homogenization trend across the study area, with plant communities becoming more similar in composition over the decades when all taxa were treated together. The observed homogenization was driven especially by the increased similarity of vascular plant and lichen communities and was largely independent of biogeographic zones or continentality-humidity gradient. Homogenization was particularly associated with the drastic encroachment of the evergreen dwarf shrub Empetrum nigrum in habitat types originally dominated by other species, and with the decrease in lichen cover. In general, our findings suggest that Fennoscandian heathland and tundra vegetation is transforming towards a more homogeneous evergreen dwarf shrub-dominated system, which may threaten ecosystem multifunctionality. Our results highlight the importance of exploring biodiversity among different metrics and growth forms to understand the overall changes in heathland and tundra biodiversity. (2025-08-01)
Subject	Earth and Environmental Sciences
Keyword	biodiversity change, vegetation resurvey, heathlands, tundra, Empetrum nigrum, crowberry, biotic homogenisation
Related Publication	Maliniemi, T., Kiilunen, P., Bråthen, K.A., Kapfer, J., Bockelie Rosendal, T., Grytnes, J.-A., Saccone, P. & Virtanen, R. (2025). Long-term homogenization of Fennoscandian heathland and tundra vegetation is connected to the expansion of an allelopathic dwarf shrub. Submitted for review.
License/Data Use Agreement	CC0 1.0

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Citation Metadata

Persistent Identifier	doi:10.18710/VYQFPK
Publication Date	2025-08-11
Title	Replication Data for: Long-term homogenization of Fennoscandian heathland and tundra vegetation is connected to the expansion of an allelopathic dwarf shrub
Author	Maliniemi, Tuija (University of Oulu) - ORCID: 0000-0003-1218-6554 Kiilunen, Petteri (University of Oulu) - ORCID: 0000-0002-1326-2291 Bråthen, Kari Anne (UiT The Arctic University of Norway) - ORCID: 0000-0003-0942-1074 Kapfer, Jutta (Norwegian Institute of Bioeconomy Research) - ORCID: 0000-0002-8077-8917 Bockelie Rosendal, Torunn (UiT The Arctic University of Norway) Grytnes, John-Arvid (Norwegian University of Life Sciences) - ORCID: 0000-0002-6365-9676 Saccone, Patrick (Institute of Botany of the Czech Academy of Sciences) - ORCID: 0000-0001-8820-593X Virtanen, Risto (University of Oulu) - ORCID: 0000-0002-8295-8217
Point of Contact	Use email button above to contact. Maliniemi, Tuija (University of Oulu) Bråthen, Kari Anne (UiT The Arctic University of Norway)
Description	This dataset contain plant community data (including vascular plants, bryophytes and lichens) from 275 vegetation plots from northern Fennoscandia (northern Finland and northern Norway). Values for each species are percentage cover estimates from 2 x 2 meter plot. Each plot has been surveyed twice, i.e., species have old and new percentage cover from 1964-75 and from 2013-23. We analyzed temporal changes in community composition and diversity across the study area and in different biogeographic zones, continentality-humidity classes and habitat types. We found a strong homogenization trend across the study area, with plant communities becoming more similar in composition over the decades when all taxa were treated together. The observed homogenization was driven especially by the increased similarity of vascular plant and lichen communities and was largely independent of biogeographic zones or continentality-humidity gradient. Homogenization was particularly associated with the drastic encroachment of the evergreen dwarf shrub Empetrum nigrum in habitat types originally dominated by other species, and with the decrease in lichen cover. In general, our findings suggest that Fennoscandian heathland and tundra vegetation is transforming towards a more homogeneous evergreen dwarf shrub-dominated system, which may threaten ecosystem multifunctionality. Our results highlight the importance of exploring biodiversity among different metrics and growth forms to understand the overall changes in heathland and tundra biodiversity. (2025-08-01)
Subject	Earth and Environmental Sciences
Keyword	biodiversity change vegetation resurvey heathlands tundra Empetrum nigrum crowberry biotic homogenisation
Related Publication	Maliniemi, T., Kiilunen, P., Bråthen, K.A., Kapfer, J., Bockelie Rosendal, T., Grytnes, J.-A., Saccone, P. & Virtanen, R. (2025). Long-term homogenization of Fennoscandian heathland and tundra vegetation is connected to the expansion of an allelopathic dwarf shrub. Submitted for review.
Language	English
Producer	University of Oulu https://www.oulu.fi/en UiT The Arctic University of Norway https://en.uit.no/
Contributor	Data Collector : Tuija Maliniemi Data Curator : Tuija Maliniemi Other : Petteri Kiilunen Data Collector : Kari Anne Bråthen Data Collector : Jutta Kapfer Data Collector : Torunn Bockelie Rosendal Data Collector : Risto Virtanen
Funding Information	Research Council of Finland: 259072 Norwegian Research Council: 302749 Foundations Post Doc pool: Finnish Cultural Foundation Research Council of Finland: Profi6, 336449, Biodiverse Anthropocenes Kvantum Institute: University of Oulu INTERACT: 262693, 730938
Distributor	UiT The Arctic University of Norway (UiT) https://dataverse.no/dataverse/uit
Depositor	Maliniemi, Tuija
Deposit Date	2025-08-01
Date of Collection	Start Date: 1964 ; End Date: 1975 Start Date: 2013 ; End Date: 2023
Data Type	survey data
Software	R statistical environment, Version: 4.4.1
Related Dataset	A third survey round and monitoring is ongoing for this dataset (not included in this dataset or in the related publication). Please contact Point of Contact (Tuija Maliniemi) for more information and/or data.
Data Source	Data from the original survey were extracted from Haapasaari, M. 1988. The oligotrophic heath vegetation of northern Fennoscandia and its zonation. - In: Acta Botanica Fennica 135. Finnish Botanical Publishing Board.

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Geographic Coverage	Finland Norway
Geographic Bounding Box	17 31 71 66

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