One fly to rule them all-muscid flies are the key pollinators in the Arctic.
Global change is causing drastic changes in the pollinator communities of the Arctic. While arctic flowers are visited by a wide range of insects, flies in family Muscidae have been proposed as a pollinator group of particular importance. To understand the functional outcome of current changes in pollinator community composition, we examined the role of muscids in the pollination of a key plant species, the mountain avens (Dryas). We monitored the seed set of Dryas across 15 sites at Zackenberg, northeast Greenland, and used sticky flower mimics and DNA barcoding to describe the flower-visiting community at each site. To evaluate the consequences of shifts in pollinator phenology under climate change, we compared the flower visitors between the early and the late season. Our approach revealed a diverse community of insects visiting Dryas, including two-thirds of all insect species known from the area. Even against this diverse background, the abundance of muscid flies emerged as a key predictor for seed set in Dryas, whereas overall insect abundance and species richness had little or no effect. With muscid flies as the main drivers of the pollinating function in the High Arctic, a recently observed decline in their abundances offers cause for concern.
Spatial Foodweb Ecology Group, Department of Agricultural Sciences, University of Helsinki, Helsinki, Finland mikko.tiusanen@helsinki.fi.
Mikko
M
Tiusanen
Centre for Biodiversity Genomics, Biodiversity Institute of Ontario, University of Guelph, Guelph, Ontario, Canada N1G 2W1.
Paul D N
http://orcid.org/0000-0002-3081-6700
PD
Hebert
Arctic Research Centre, Department of Bioscience, Aarhus University, Roskilde, Denmark.
Niels Martin
http://orcid.org/0000-0002-4166-6218
NM
Schmidt
Spatial Foodweb Ecology Group, Department of Agricultural Sciences, University of Helsinki, Helsinki, Finland Department of Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden.
Tomas
http://orcid.org/0000-0002-2957-4791
T
Roslin
DNA barcoding; Dryas; arctic ecology; ecosystem functioning; pollination
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