Ephemerella aurivillii

(Bengtsson, 1909)

spiny crawler mayfly

Ephemerella aurivillii is a spiny crawler mayfly in the Ephemerellidae with a strict one-year . The occurs across northern regions of the Northern Hemisphere, including Europe, northern Asia, and North America. Research in Norway demonstrated that its distribution and growth rates are strongly temperature-dependent, with expanding following hydropower-induced warming of previously cold streams.

Pronunciation

How to pronounce Ephemerella aurivillii: /ɛˌfɛmɛˈrɛlə ɔˌrɪvɪˈli.aɪ/

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Habitat

Cold, flowing freshwater streams and rivers. In Norway, established in river systems with sufficient thermal to complete larval development within one year.

Distribution

Europe; Northern Asia (excluding China); North America including all of Canada, the northern and southwestern United States, and Alaska.

Seasonality

(imagos) present June–August; young larvae occur from June to early September.

Life Cycle

One-year cycle. Full-grown larvae recorded 1–2 months earlier in thermally enriched streams compared to unregulated rivers. and occur in summer.

Human Relevance

Serves as an for thermal regime changes in freshwater systems; documented response to hydropower regulation demonstrates utility for monitoring climate and anthropogenic impacts on aquatic .

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Sources and further reading