2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/25/2021 | 8:30 AM - 10:30 AM | FIELD-DERIVED SALINITY TOLERANCES MAY NOT ACCURATELY PREDICT LAB SURVIVAL IN PTERONARCYS CALIFORNICA | Virtual Platform
FIELD-DERIVED SALINITY TOLERANCES MAY NOT ACCURATELY PREDICT LAB SURVIVAL IN PTERONARCYS CALIFORNICA
Increasing salinization of freshwaters threatens freshwater biodiversity. Field data are often used to infer tolerances of different species to salinity and other stressors. However, such correlative observations may not always accurately describe stressor-specific tolerances because many environmental variables naturally covary with one another. Such correlative relationships potentially confound our ability to identify the actual mechanisms influencing species distributions. It is critical to experimentally verify field-derived estimates of species’ environmental tolerances. Long-term, chronic-exposure experiments should be most useful in validating such relationships because they best mimic exposures in nature, but very few such studies have been conducted on freshwater macroinvertebrates. Field-derived estimates of salinity (measured as specific conductivity) imply that the stonefly Pteronarcys californica is restricted to conductivities < 400 µS/cm, but long-term laboratory rearing experiments indicate this species can tolerate much higher salinity levels. Such apparent mismatches might arise if laboratory treatments do not mimic well how the concentrations of specific ions vary across natural streams. Conversely, our results may indicate that field-based measures of salinity may simply be correlated with causal factors that do influence species distributions.
- Conductivity
- Major ions
- Stream
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Presenters/Authors
Katy Gardner
(), Utah State University, katy.gardner@usu.edu;
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Charles Hawkins
(), Utah State University, chuck.hawkins@usu.edu;
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