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. inhabit gravel substrates and show distinct drift patterns across . 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; prefer larger gravel particles and areas with scanty detritus.
Distribution
North America; Nearctic region.
Seasonality
occurs in June; present year-round with a 2-year development cycle.
Life Cycle
2-year cycle. hatch within 3 weeks. First summer: 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 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 .