2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/24/2018 | 9:30 AM - 9:45 AM | TEMPERATURE EFFECTS ON MAYFLY RESPONSES TO ELEVATED CHLORIDE | 310 A
TEMPERATURE EFFECTS ON MAYFLY RESPONSES TO ELEVATED CHLORIDE
Salinity in freshwater ecosystems has increased over the last several decades at numerous locations throughout the world. Salinity increases often reflect an increase in chloride. Chloride concentrations can vary seasonally when resulting from deicing, with highest chloride concentrations when water temperature is low. Our study examined at acute (96 h) responses for four mayfly species (Baetidae: Neocloeon triangulifer, Procloeon fragile; Heptageniidae: Maccaffertium modestum; Leptophlebiidae: Leptophlebia cupida). Based on acute LC50s at 20°C, P. fragile was most sensitive (LC50 = 311 mg Cl/L), followed by M. modestum (1566 mg/L), N. triangulifer (1583 mg/L), and L. cupida (2691 mg/L). Acute LC50s increased as temperature decreased, reaching a maximum of 4080 mg/L for P. fragile, 6259 mg/L for N. triangulifer, 4302 mg/L for M. modestum, and 6244 mg/L for L. cupida. Simple linear regressions were significant for all four species. Our results show that acute (96 h) chloride toxicity is strongly temperature dependent for the mayfly species tested, and suggest that brief periods of elevated chloride during cold seasons or in colder locations may be ecologically less important than might be predicted by standard laboratory bioassays conducted at 20 or 25°C.
- Pollution
- Temperature
- Urban
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Presenters/Authors
John Jackson
(), Stroud Water Research Center, jkjackson@stroudcenter.org;
ASHA DISCLOSURE:
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David Funk
(), Stroud Water Research Centrer, dfunk@stoudcenter.org;
ASHA DISCLOSURE:
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Nonfinancial -