Life History and Productivity of Hexagenia limbata (Ephemeroptera: Ephemeridae) and Selected Physico-Chemical Parameters in Two Tributaries of the Wekiva River, Central Florida

Authors

  • Richard J. Lobinske
  • Arshad Ali
  • I. Jack Stout

Abstract

Nymphal densities and size frequency distribution of Hexagenia limbata (Serville), a burrowing mayfly, were determined monthly for two years in two tributaries of the Wekiva River, central Florida, along with selected physico-chemical water parameters. Blackwater Creek supported a mean number of 112 (range 0-434) and Rock Springs Run 89 nymphs per m 2 (range 11-258). The mayfly species displayed a univoltine life history with adult emergence peaking in August. Productivity in Blackwater Creek was estimated at 4.688 g per m 2 and in Rock Springs Run at 3.123 g per m 2 . Productivity/biomass ratios were estimated at 4.09 and 4.59 in Blackwater Creek and Rock Springs Run, respectively. The nymphal densities in both streams were positively correlated with water pH and negatively correlated with water volume. Apparently, water volume was the overriding abiotic factor in both streams, influencing several measured water parameters and as well as nymphal populations during the study period.

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Published

1996-12-01

Issue

Vol. 79, No. 4 (December 1996)

Section

Literature Review Articles

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