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Establishing wetlands for nutrient capture and biodiversity support may introduce trade‐offs between environmentally beneficial functions and detrimental greenhouse gas emissions. Investigating the interaction of nutrient capture, primary production, greenhouse gas production and biodiversity support is imperative to understanding the overall function of wetlands and determining possible beneficial synergistic effects and trade‐offs. Here, we present temporally replicated data from 17 wetlands in hemi‐boreal Sweden. We explored the relationship between nutrient load, primary producing algae, production of methane and nitrous oxide, and emergence rates of chironomids to determine what factors affected each and how they related to each other. Chironomid emergence rates correlated positively with methane production and negatively with nitrous oxide production, where water temperature was the main driving factor. Increasing nutrient loads reduced methanogenesis through elevated nitrogen concentrations, while simultaneously enhancing nitrous oxide production. Nutrient loads only indirectly increased chironomid emergence rates through increased chlorophyll‐a concentration, via increased phosphorus concentrations, with certain taxa and food preference functional groups benefitting from increased chlorophyll‐a concentrations. However, water temperature seemed to be the main driving factor for chironomid emergence rates, community composition and diversity, as well as for greenhouse gas production. These findings increase our understanding of the governing relationships between biodiversity support and greenhouse gas production, and should inform future management when constructing wetlands. [ABSTRACT FROM AUTHOR]

A new species of the chironomid genus Tavastia was frequently collected in wetlands of the River Dalalven lowlands in central Sweden from 2002 to 2007. Unpublished data revealed that the species has been known from Finland since 1974. The new species T. yggdrasilia can be separated from other Tavastia species by the combination of a gonostylus with strong crista dorsalis in proximal half, AR 0.93-1.16, and wing veins M3 + 4 and Cu1 without setae. A description of the male and the female is included, as is also a key to the males of the four known species of Tavastia. All records of T. yggdrasilia are from sites with mesotrophic or eutrophic conditions. [ABSTRACT FROM AUTHOR]