Heated rivalries: phenological variation modifies competition for pollinators among arctic plants

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Tiusanen , M , Kankaanpää , T , Schmidt , N M & Roslin , T 2020 , ' Heated rivalries: phenological variation modifies competition for pollinators among arctic plants ' , Global Change Biology , vol. 26 , no. 11 , pp. 6313-6325 . https://doi.org/10.1111/gcb.15303

Title: Heated rivalries: phenological variation modifies competition for pollinators among arctic plants
Author: Tiusanen, Mikko; Kankaanpää, Tuomas; Schmidt, Niels Martin; Roslin, Tomas
Contributor organization: Research Centre for Ecological Change
Spatial Foodweb Ecology Group
Department of Agricultural Sciences
Date: 2020-11
Language: eng
Number of pages: 13
Belongs to series: Global Change Biology
ISSN: 1354-1013
DOI: https://doi.org/10.1111/gcb.15303
URI: http://hdl.handle.net/10138/326562
Abstract: When plant species compete for pollinators, climate warming may cause directional change in flowering overlap, thereby shifting the strength of pollinator-mediated plant-plant interactions. Such shifts are likely accentuated in the rapidly warming Arctic. Targeting a plant community in Northeast Greenland, we asked (a) whether the relative phenology of plants is shifting with spatial variation in temperature, (b) whether local plants compete for pollination, and (c) whether shifts in climatic conditions are likely to affect this competition. We first searched for climatic imprints on relative species phenology along an elevational gradient. We then tested for signs of competition with increasing flower densities: reduced pollinator visits, reduced representation of plant species in pollen loads, and reduced seed production. Finally, we evaluated how climate change may affect this competition. Compared to a dominant species,Dryas integrifolia x octopetala, the relative timing of other species shifted along the environmental gradient, withSilene acaulisandPapaver radicatumflowering earlier toward higher elevation. This shift resulted in larger niche overlap, allowing for an increased potential for competition for pollination. Meanwhile,Dryasemerged as a superior competitor by attracting 97.2% of flower visits. HigherDryasdensity resulted in reduced insect visits and less pollen ofS. acaulisbeing carried by pollinators, causing reduced seed set byS. acaulis. Our results show that current variation in climate shifts the timing and flowering overlap between dominant and less-competitive plant species. With climate warming, such shifts in phenology within trophic levels may ultimately affect interactions between them, changing the strength of competition among plants.
Subject: ABUNDANCE
CLIMATE VARIATION
COMMUNITY
DIVERSITY
ELEVATION
INTERACTION NETWORKS
MASS-FLOWERING CROPS
OVERLAP
SPECIALIZATION
TIME
arctic ecology
climate change effects
competition for pollination
flowering phenology
indirect competition
phenology shift
pollination
1181 Ecology, evolutionary biology
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion


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