Authors

R. J. Lobinske; A. Ali;I. J. Stout

Comments

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Abbreviated Journal Title

Fla. Entomol.

Keywords

mayfly; life history; streams; size frequency distribution; physico-chemical parameters; productivity; LAKE; Entomology

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.

Journal Title

Florida Entomologist

Volume

79

Issue/Number

4

Publication Date

1-1-1996

Document Type

Article

Language

English

First Page

543

Last Page

551

WOS Identifier

WOS:A1996WB98100009

ISSN

0015-4040

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