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Simulated global change: contrasting short and medium term growth and reproductive responses of a common alpine/Arctic cushion plant to experimental warming and nutrient enhancement
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Plant Ecology and Evolution.ORCID iD: 0000-0001-5084-850X
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Plant Ecology and Evolution.ORCID iD: 0000-0003-2803-7465
2014 (English)In: SpringerPlus, E-ISSN 2193-1801, Vol. 3, article id 157Article in journal (Refereed) Published
Abstract [en]

Cushion plants are important components of alpine and Arctic plant communities around the world. They fulfill important roles as facilitators, nurse plants and foundation species across trophic levels for vascular plants, arthropods and soil microorganisms, the importance of these functions increasing with the relative severity of the environment. Here we report results from one of the few experimental studies simulating global change impacts on cushion plants; a factorial experiment with warming and nutrient enhancement that was applied to an alpine population of the common nurse plant, Silene acaulis, in sub-arctic Sweden. Experimental perturbations had significant short-term impacts on both stem elongation and leaf length. S. acaulis responded quickly by increasing stem elongation and (to a lesser extent) leaf length in the warming, nutrient, and the combined warming and nutrient enhancements. Cover and biomass also initially increased in response to the perturbations. However, after the initial positive short-term responses, S. acaulis cover declined in the manipulations, with the nutrient and combined warming and nutrient treatments having largest negative impact. No clear patterns were found for fruit production. Our results show that S. acaulis living in harsh environments has potential to react quickly when experiencing years with favorable conditions, and is more responsive to nutrient enhancement than to warming in terms of vegetative growth. While these conditions have an initial positive impact, populations experiencing longer-term increased nutrient levels will likely be negatively affected.

Place, publisher, year, edition, pages
2014. Vol. 3, article id 157
Keyword [en]
Alpine, Biomass, Climate change, Cover, Fruit production, Meadow, Silene acaulis, Tundra
National Category
Ecology
Identifiers
URN: urn:nbn:se:uu:diva-310523DOI: 10.1186/2193-1801-3-157ISI: 000358960900001PubMedID: 24790813OAI: oai:DiVA.org:uu-310523DiVA, id: diva2:1057534
Available from: 2016-12-19 Created: 2016-12-16 Last updated: 2017-11-29Bibliographically approved

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