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Elevated Salinity Rapidly Confers Cross-Tolerance to High Temperature in a Splash-Pool Copepod
1Hopkins Marine Station of Stanford University, 120 Ocean View Boulevard, Pacific Grove, CA 93950, USA.
Integrative Organismal Biology (Oxford, England)
|August 25, 2022
Summary
The copepod Tigriopus californicus enhances its heat tolerance by adjusting physiology to environmental changes, particularly leveraging the correlation between high temperatures and salinity. This allows it to survive in its variable habitat.
Area of Science:
- Environmental physiology
- Climate change adaptation
- Marine invertebrate biology
Background:
- Organismal responses to climate change depend on understanding physiological adjustments to environmental variation.
- Laboratory experiments often lack realism due to unpredictable environmental fluctuations and interacting stressors.
- The splash-pool copepod Tigriopus californicus faces highly variable salinity and temperature.
Purpose of the Study:
- To investigate how Tigriopus californicus adjusts its physiology to environmental changes, specifically temperature and salinity.
- To determine the relationship between environmental stressors and thermal tolerance in T. californicus.
- To explore the role of physiological plasticity in coping with rapid environmental fluctuations.
Main Methods:
- Field collection of T. californicus and measurement of their thermal tolerance.
- Analysis of long-term environmental records for temperature and salinity patterns.
- Laboratory experiments exposing copepods to thermal and salinity stress.
Main Results:
- Salinity and daily maximum temperature are highly variable and unpredictable in the T. californicus habitat.
- High ambient salinity correlates with high temperatures, and median lethal temperature increases significantly with salinity.
- Sublethal exposure to heat or salinity rapidly enhances heat tolerance, with salinity having a greater effect than temperature.
Conclusions:
- T. californicus exhibits physiological plasticity to cope with its hypervariable environment.
- The copepod leverages the correlation between salinity and temperature, with salinity being a dominant cue for heat tolerance.
- Mechanistic cross-talk between responses to salinity and heat stress is crucial for adaptation.
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