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Are sulfate effects in the mayfly Neocloeon triangulifer driven by the cost of ion regulation?
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Are sulfate effects in the mayfly Neocloeon triangulifer driven by the cost of ion regulation?
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Journal Article
Are sulfate effects in the mayfly Neocloeon triangulifer driven by the cost of ion regulation?
2018
Overview
Elevated major ion concentrations in streams are commonly observed as a consequence of resource extraction, de-icing and other anthropogenic activities. Ecologists report biodiversity losses associated with increasing salinity, with mayflies typically being highly responsive to increases of different major ions. In this study, we evaluated the performance of the mayfly
Neocloeon triangulifer
reared for its entire larval phase in a gradient of sulfate concentrations. Two natural waters were amended with SO
4
as a blend of CaSO
4
and MgSO
4
and exposures ranged from 5 to 1500 mg l
–1
SO
4.
Survival (per cent successful emergence to the subimago stage) was significantly reduced at the highest SO
4
concentration in both waters, while development was significantly delayed at 667 mg l
−1
SO
4
. Final sub-adult body weights were consistent across treatments, except at the highest treatment concentration. Despite evidence for sulfate uptake rates increasing with exposure concentrations and not being saturated at even extremely high SO
4
concentrations, total body sulfur changed little in subimagos. Together, these results suggest that elevated SO
4
imposes an energetic demand associated with maintaining homeostasis that is manifested primarily as reduced growth rates and associated developmental delays. We identified two genes related to sulfate transport in
N. triangulifer
.
This article is part of the theme issue ‘Salt in freshwaters: causes, ecological consequences and future prospects’.
Publisher
The Royal Society
