| physiological responses of three species of unionid mussels to intermittent exposure to elevated carbon dioxide. | freshwater systems are at risk owing to increasing carbon dioxide (co2) levels, and one of the possible reasons for these elevations is the deployment of non-physical fish barriers to prevent invasive fish movements. carbon dioxide barriers have the potential to create short, chronic and intermittent exposures of co2 for surrounding freshwater biota. although intermittent exposures to a stressor may be more ecologically relevant, the majority of laboratory tests use chronic or short-term time pe ... | 2016 | 28066552 |