EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021

(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)

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5/26/2021 | 8:30 AM - 10:30 AM | AQUIFER STONEFLIES MAY BE LESS VULNERABLE TO CLIMATE CHANGE THAN BENTHIC STONEFLIES IN ALLUVIAL RIVER FLOODPLAINS | Virtual Platform

AQUIFER STONEFLIES MAY BE LESS VULNERABLE TO CLIMATE CHANGE THAN BENTHIC STONEFLIES IN ALLUVIAL RIVER FLOODPLAINS

The sensitivity and thermal tolerance of different species to warming temperatures in part determines habitat suitability and responses to climate change. Alluvial river floodplains are home to aquifer and benthic stoneflies that inhabit environments with different temperature regimes. We predicted that aquifer stoneflies would be more sensitive to warming temperatures because they experience constantly cold temperatures, whereas benthic species experience more diurnal and seasonal temperature variability. To test this prediction, we conducted intermittent respirometry experiments on nymphs of three aquifer and five benthic species across three floodplains in western Montana. We measured movement patterns, survival, and mass-specific metabolic rates (MSMRs) on 256 individual nymphs at 3-degree increments from 6-30 ºC. Aquifer and benthic taxa showed no difference in the highest temperature at which movement occurred (28 ºC), and they survived equally well. However, the benthic species C. sabulosa did have lower survival compared to other taxa. Mean MSMRs peaked at slightly higher temperatures for aquifer vs. benthic taxa (22.4 vs 21.2 ºC), but differences were not significant. Aquifer taxa may be less vulnerable to warming temperatures given their tolerance and location within buffered aquifers.

Stream
Stressor
Ecological dynamics

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Presenters/Authors

Rachel Malison (), Flathead Lake Biological Station, The University of Montana, rachel.malison@umontana.edu;