2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/25/2021 | 8:30 AM - 10:30 AM | Counting our losses: Quantifying the effects of increasing salinity on invertebrate taxonomic completeness | Virtual Platform
Counting our losses: Quantifying the effects of increasing salinity on invertebrate taxonomic completeness
Invertebrates vary widely in their tolerance to increased salinity, with moderate increases favoring some taxa but locally extirpating others. Increasing salinity is a global problem and likely affects the distribution of many invertebrate taxa both directly and indirectly. Though we can predict the effects of increased salinity on individual taxa, we have less understanding of assemblage responses to increasing salinity. To examine how invertebrate assemblages respond to salinity alterations I modeled the proportional taxa losses as a function of increased salinity. I used O/E scores from California as estimates of taxa losses and estimated salinity increases as the difference between observed specific conductivity and the expected natural background. Increased salinity accounted for 25% of the variability in taxa completeness, with each 1 mS/cm increase in conductivity associated with a loss of 10% of expected taxa. Oil/gas extraction were strongly associated with salinity changes (R2 = 0.68) with 1 mS/cm increase in conductivity associated with a 20% loss of expected taxa, but agriculture had only weak effects. Increases in salinity should be assessed during causal analyses as a potentially important stressor on aquatic communities.
- Stressor
- Biological effects
- Stream
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Presenters/Authors
John Olson
(), Dept of Applied Environmental Science, California State University Monterey Bay, CA, USA, joolson@csumb.edu;
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