Cuttlefish Early Development and Behavior Under Future High CO₂ Conditions

Area of Science:

• Marine Biology
• Oceanography
• Ecology

Background:

• Increasing oceanic carbon dioxide (CO2) causes ocean acidification (OA), altering seawater chemistry.
• OA is known to impair marine taxa physiology and behavioral ecology, including cephalopods.

Purpose of the Study:

• To investigate the effects of OA on the development and behavioral ecology of early life stages of the common cuttlefish (Sepia officinalis).
• To assess OA impacts on cuttlefish embryogenesis, hatching success, survival, and behaviors like shelter-seeking, hunting, and predator response.

Main Methods:

• Exposed common cuttlefish embryos and hatchlings to OA conditions (∼1000 μatm; ΔpH = 0.4) throughout embryogenesis until 20 days post-hatching.
• Monitored key developmental parameters: development time, hatching success, survival rates, and biometric data.
• Evaluated behavioral responses including shelter-seeking, hunting, and reaction to a visual alarm cue.

Main Results:

• OA conditions did not compromise cuttlefish embryogenesis, with no significant differences in development time, hatching success, survival, or biometric data.
• Cuttlefish hatchlings exhibited behavioral resilience to OA, showing no significant differences in shelter-seeking, hunting, or response to alarm cues between treatments.
• Early life stages of Sepia officinalis demonstrated a notable resistance to projected ocean acidification levels.

Conclusions:

• The common cuttlefish's lifestyle and developmental adaptations may confer phenotypic plasticity, enhancing their resilience to future ocean acidification.
• While individual stressors like OA may not severely impact cuttlefish, further research on interacting multiple stressors is crucial for predicting long-term resilience.
• Sepia officinalis may possess inherent traits that favor its survival and recruitment in a changing, acidified ocean environment.