Ec. Phillips et al., LIFE-HISTORY AND SECONDARY PRODUCTION OF EPHORON-ALBUM (SAY) (EPHEMEROPTERA, POLYMITARCYIDAE) IN THE ILLINOIS RIVER, ARKANSAS, Journal of the Kansas Entomological Society, 67(3), 1994, pp. 242-247
III the Ilinois River, the burrowing mayfly Ephoron album (Say) had a
univoltine Life cycle with approximately an eight month egg diapause.
Nymphs were first collected on 14 April, and the adults on 23 July, wi
th peak emergence occurring between 27 July and 9 August. Linear regre
ssion analysis showed a significant relationship between head capsule
width and dry weight. Annual production estimates ranged from 5.92 to
6.70 g/m(2)/yr dry weight, and the cohort standing crop biomass was 8.
24 g/m(2). Cohort P/B ratios ranged from 7.19 to 8.13, and annual P/B
ratios from 17.26 to 19.52. The cohort production interval was estimat
ed at 126 days, based on field observations.