Vegetation change on mountaintops in northern Sweden: Stable vascular-plant but reordering of lichen and bryophyte communities

Liyenne Wu Chen Hagenberg; Thomas Vanneste; Oystein H. OpedalHanne Torsdatter PetlundMats P. BjoerkmanRobert G. BjoerkHakon HolienJuul LimpensUlf MolauBente Jessen GraaePieter De Frenne

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Vegetation change on mountaintops in northern Sweden: Stable vascular-plant but reordering of lichen and bryophyte communities

机译：Vegetation change on mountaintops in northern Sweden: Stable vascular-plant but reordering of lichen and bryophyte communities

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Alpine ecosystems harbor remarkably diverse and distinct plant communities that are characteristically limited to harsh, and cold climatic conditions. As a result of thermal limitation to species occurrence, mountainous ecosystems are considered to be particularly sensitive to climate change. Our understanding of the impact of climate change is mainly based on vascular plants however, whereas cryptogams (i.e., lichens and bryophytes) are generally neglected or simply considered as one functional group. Here we aimed to improve our understanding of the drivers underlying temporal changes in vegetation of alpine ecosystems. To this end, we repeatedly surveyed the vegetation on four mountain summits along an elevational gradient in northern Sweden spanning a 19-year period. Our results show that the vascular plant communities remained relatively stable throughout the study period, despite fluctuations in terms of ground cover and species richness of shrubs and graminoids. In contrast, both lichens and bryophytes substantially decreased in cover and diversity, leading to alterations in community composition that were unrelated to vascular plant cover. Thermophilization of the vascular plant community was found only on the two intermediate summits. Our findings are only partially consistent with (long-term) climate-change impacts, and we argue that local non-climatic drivers such as herbivory might offset vegetation responses to warming. Hence, we underline the importance of considering local non-climatic drivers when evaluating temporal vegetation change in biologically complex systems.

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《Ecological research》 |2022年第6期|722-737|共16页
作者
Liyenne Wu Chen Hagenberg; Thomas Vanneste; Oystein H. OpedalHanne Torsdatter PetlundMats P. BjoerkmanRobert G. BjoerkHakon HolienJuul LimpensUlf MolauBente Jessen GraaePieter De Frenne;
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Plant Ecology and Nature Conservation Group, Wageningen University & Research, Wageningen, The Netherlands;

Forest & Nature Lab, Department of Environment, Faculty of Bioscience Engineering, Ghent University, Gontrode, Belgium;

Biodiversity Unit, Department of Biology, Lund University, Lund, SwedenDepartment of Biology, Norwegian University of Science and Technology, Trondheim, NorwayDepartment of Earth Sciences, University of Gothenburg, Gothenburg, Sweden,Gothenburg Global Biodiversity Centre, Goteborg, SwedenFaculty of Biosciences and Aquaculture, Nord University, Steinkjer, NorwayDepartment of Biological and Environmental Sciences, University of Gothenburg, Gothenburg, Sweden;

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alpine vegetation; climate change impact; ecosystem change; lichens and bryophytes; non-climatic drivers;

Vegetation change on mountaintops in northern Sweden: Stable vascular-plant but reordering of lichen and bryophyte communities

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