Seasonal availability and sensitivity of two field-collected mayflies for the development of a standardized toxicity test.

Environmental Monitoring and Assessment
Brandi Shontia EcholsJ R Voshell

Abstract

Ecologically relevant toxicity tests may provide the best protection of sensitive aquatic fauna, but without established culturing or test methodology for such organisms, results may be unreliable and difficult to repeat. Further, field-collected organisms may not be feasible for routine testing purposes, as often required for permitted discharges. This study examined the feasibility of testing two field-collected mayflies, Isonychia bicolor and Maccaffertium spp., over a 1-year period. Seasonal comparisons of availability indicated I. bicolor and Maccaffertium spp. were most abundant during the winter months, resulting in 31 and 49 % of total organisms collected in 2009, while summer was the most difficult time to collect either species. Initial testing in January 2009 resulted in the highest no observable effect concentration (NOEC) values for survivorship (8 g NaCl for I. bicolor and 4 and 8 g NaCl/L for Maccaffertium spp.) when tested at 9 °C. Subsequent tests conducted at 20-23 °C resulted in 7-day NOEC values substantially lower (mean = 1.44 and 1.59 g NaCl/L). Geometric means of exuviae indicated a dose-dependent response for I. bicolor exposed to NaCl, while no dose-dependent response was observed for Maccaffertium spp....Continue Reading

References

Jun 1, 1975·Environmental Research·R W ClubbJ L Lords
Feb 1, 1976·Bulletin of Environmental Contamination and Toxicology·R B Nehring
Jun 16, 2004·Environmental Monitoring and Assessment·A J KennedyR J Currie
Mar 18, 2005·Archives of Environmental Contamination and Toxicology·F J DwyerG N Neuderfer
Oct 6, 2007·Archives of Environmental Contamination and Toxicology·Stephen F Brinkman, Walter D Johnston
Apr 19, 2008·Environmental Toxicology and Chemistry·Kathryn O'HalloranJon S Harding

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Citations

Oct 14, 2014·Environmental Toxicology and Chemistry·Brent R JohnsonDavid H Funk
Apr 29, 2015·Environmental Toxicology and Chemistry·David J Soucek, Amy Dickinson
Nov 7, 2017·Environmental Toxicology and Chemistry·Daniel B PickfordMick Hamer

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