Article
The Replacement of Stenonema spp. by Caenis diminuta Walker as the Numerical Dominant in the Mayfly Assemblage of a Thermally-Stressed Stream
Journal of Freshwater Ecology
(1985)
Abstract
Mayfly community structures in a thermally-stressed, previously thermally-stressed and an undisturbed stream were compared based on nymphal colonization of leaf packs incubated over a 48 d period from December 1982 to February 1983. Temperatures ranged from 7–31C in the thermally-stressed stream and from 4–12C in the other two streams. Accumulated degree days (>0C) were 734, 340 and 322 for the thermally-stressed, post-stressed and undisturbed streams, respectively. Stenonema spp. numerically dominated the mayfly fauna over the sampling period in the undisturbed (70%) and post-stressed (98%) streams, but was replaced by Caenis diminuta Walker (88%) in the stream receiving thermal effluent from a nuclear production reactor. Caenis diminuta is tolerant of rapidly fluctuating (Delta;T > 11C/hr) and high temperatures (possibly up to 40C).
Keywords
- Mayfly community structures
Disciplines
Publication Date
January 6, 1985
DOI
10.1080/02705060.1985.9665088
Citation Information
N. LeRoy Poff and Robin A. Matthews. "The Replacement of Stenonema spp. by Caenis diminuta Walker as the Numerical Dominant in the Mayfly Assemblage of a Thermally-Stressed Stream" Journal of Freshwater Ecology Vol. 3 Iss. 1 (1985) p. 19 - 26 Available at: http://works.bepress.com/robin_matthews/32/