2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/25/2021 | 8:30 AM - 10:30 AM | PHYSIOLOGICAL PLASTICITY AND ACCLIMATORY RESPONSES TO SALINITY STRESS ARE ION SPECIFIC IN THE MAYFLY, NEOCLOEON TRIANGULIFER | Virtual Platform
PHYSIOLOGICAL PLASTICITY AND ACCLIMATORY RESPONSES TO SALINITY STRESS ARE ION SPECIFIC IN THE MAYFLY, NEOCLOEON TRIANGULIFER
While freshwater salinization has been correlated with significant declines in aquatic biodiversity, it remains unclear if or how species can acclimate to changing salinity regimes. We used larvae of the parthenogenetic mayfly, Neocloeon triangulifer, to ask how ionic exposure history alters subsequent ionic transport rates by using radiotracers (22Na, 35SO4 and 45Ca). We observed that mayflies reared in dilute control water (16 mg L-1 Na and 23 mg L-1 SO4) and subsequently transferred to elevated salinities (153 mg L-1 Na or 667 mg L-1 SO4) had 2-fold (p<0.0001) and 8-fold (p<0.0001) greater ion uptake rates than mayflies chronically reared in elevated Na or SO4, respectively. These acclimatory ion transport changes provided protection in a 96-hour toxicity bioassay for Na, but not SO4. Interestingly, Ca uptake was uniformly much lower and minimally influenced by exposure history, but was more harmful in the toxicity bioassays. We provide novel light microscopic evidence for Ca damage within the epithelium of the Malpighian tubules (insect primary excretory system) that leads to degeneration and necrosis. We conclude that physiological plasticity to salinity stress is ion specific and provide evidence for ion-specific toxicity mechanisms in N. triangulifer.
- Osmoregulation
- Transport
- Stream
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Presenters/Authors
Sarah Orr
(), North Carolina State University, seorr@ncsu.edu;
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Tatiane Terumi Negrão Watanabe
(), North Carolina State University, tnegrao@ncsu.edu;
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David Buchwalter
(), North Carolina State University, dbbuchwa@ncsu.edu;
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