Arctic chironomids of the northwest North Atlantic reflect environmental and biogeographic gradients

• Published in: Journal of Biogeography
• Main Authors: Medeiros, Andrew, Milošević, Djuradj, Francis, Donna, Maddison, Eleanor, Woodroffe, Sarah, Long, Antony, Walker, Ian, Hamerlík, Ladislav, Quinlan, Roberto, Langdon, Peter, Brodersen, Klaus, Axford, Yarrow
• Format: Article in Journal/Newspaper
• Language: English
• Published: 2021
• Subjects: Arctic; Canada; Greenland; Arctic Archipelago; Atlantic Arctic; Atlantic-Arctic; Iceland; North Atlantic
• Online Access: https://eprints.soton.ac.uk/444893/; https://eprints.soton.ac.uk/444893/1/Medeirosa_etal_2020_09_23_accepted.docx

Aim: while we understand broad climate drivers of insect distributions throughout the Arctic, less is known about the role of spatial processes in determining these relationships. As such, there is a need to understand how spatial controls may influence our interpretations of chironomid environment relationships. Here, we evaluated whether the distribution of chironomids followed spatial gradients, or were primarily controlled by environmental factors. Location: Eastern Canadian Arctic, Greenland, Iceland. Taxon: non-biting midges (Chironomidae) Methods: we examined chironomid assemblages from 239 lakes in the western North Atlantic Arctic region (specifically from the Arctic Archipelago of Canada, two parts of west Greenland (the southwest and central west), and northwest Iceland). We used a combination of unconstrained ordination (Self Organizing Maps); a simple method with only one data matrix (community data), and constrained ordination (Redundancy Analysis); a canonical ordination with two data sets where we extracted structure of community related to environmental data. These methods allowed us to model chironomid assemblages across a large bioregional dimension and identify specific differences between regions that were defined by common taxa represented across all regions in high frequencies, as well as rare taxa distinctive to each region found in low frequencies. We then evaluated the relative importance of spatial processes versus local environmental factors. Results: we find that environmental controls explained the largest amount of variation in chironomid assemblages within each region, and that spatial controls are only significant when crossing between regions. Broad-scale biogeographic effects on chironomid distributions are reflected by the distinct differences between chironomid assemblages of Iceland, central-west Greenland, and eastern Canada, defined by the presence of certain common and low-frequency, rare taxa for each region. Environmental gradients, especially temperature, defined ...