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Effects of salinity changes on aquatic organisms in a multiple stressor context
Josefa Velasco1, Cayetano Gutiérrez-Cánovas2, María Botella-Cruz3
1Department of Ecology and Hydrology, University of Murcia, Murcia, Spain jvelasco@um.es.
Summary
Global change alters aquatic ecosystems, with salinization and dilution impacting organisms. Restoring natural salinity is key to mitigating multiple stressor impacts on aquatic life.
Area of Science:
- Ecology
- Environmental Science
- Aquatic Toxicology
Background:
- Aquatic ecosystems worldwide face changing ion concentrations due to global change.
- Freshwater systems are increasingly salinized by human activities, while naturally saline waters are diluted by agricultural practices.
- These salinity changes interact with other environmental stressors, leading to complex effects on aquatic organisms.
Purpose of the Study:
- To synthesize the effects of salinity and other stressors on aquatic organisms' performance.
- To quantify the frequency of different interaction types (additive, antagonistic, synergistic) between salinity and other stressors.
- To determine the overall individual and joint effects of multiple stressors on aquatic life using meta-analysis.
Main Methods:
- A comprehensive review of experimental studies manipulating salinity and other abiotic stressors in inland and transitional aquatic habitats.
- Meta-analysis was employed to synthesize data from 105 study responses.
- Analysis focused on organism performance across various salinity-stressor combinations and organism groups.
Main Results:
- Additive effects between salinity and other stressors were slightly more frequent (54%) than non-additive effects (46%).
- Antagonistic effects predominated in interactions involving salinity and toxicants (44%), transitional habitats (48%), and vertebrates (71%).
- Meta-analyses revealed detrimental additive joint effects of salinity and other stressors, with salinity having a greater individual impact.
Conclusions:
- Salinity is a major stressor in aquatic ecosystems, often acting additively with other environmental changes.
- Mitigation strategies should prioritize restoring natural salinity levels to protect aquatic organisms from combined stressors.
- Understanding these joint effects is crucial for effective aquatic ecosystem management under global change.
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