Habrophlebia vibrans
Needham, 1908
pronggilled mayfly
A small stream-dwelling with a 2-year , notable for its extended development compared to most mayflies. emerge synchronously in June. Nymphs inhabit gravel substrates and show distinct drift patterns across life stages. The has been studied in Québec , where it reaches final sizes of approximately 5 mm before .
Pronunciation
How to pronounce Habrophlebia vibrans: /hæbroʊˈfliːbiə ˈvaɪbræns/
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Habitat
Streams with gravel substrates; nymphs prefer larger gravel particles and areas with scanty detritus.
Distribution
North America; Nearctic region.
Seasonality
occurs in June; nymphs present year-round with a 2-year development cycle.
Life Cycle
2-year cycle. hatch within 3 weeks. First summer: nymphs reach ~1.65 mm. First year: nymphs grow to ~2.1 mm. Second summer: nymphs reach ~3 mm. Final weeks before : nymphs attain 5.0 mm.
Behavior
Drift occurs in three distinct phases: small nymphs drift during August of their first year; larger nymphs drift during spring ; mature nymphs drift at . This drift pattern results in concentration of emergence in lower stream reaches.
Ecological Role
production of 710–829 mg/m²; production to ratio of 2.5–3.2. Approximately three-quarters of production attributed to second-year cohort; half of total production accumulated in final two months before .