Climate-Change Impacts on Cephalopods: A Meta-Analysis

Area of Science:

• Marine Biology
• Climate Change Ecology
• Invertebrate Physiology

Background:

• Cephalopods are vital to marine ecosystems and fisheries.
• They are hypothesized to benefit from climate change and overfishing.
• Previous meta-analyses show negative impacts of ocean warming (OW) and acidification (OA) on other marine taxa.

Approach:

• Surveyed peer-reviewed literature on cephalopod exposure to OW and OA.
• Applied mixed-model meta-analyses to 784 control-treatment comparisons from 47 articles.
• Evaluated impacts on survival, metabolism, behavior, cell stress, and growth across taxa, climates, and life stages.

Key Points:

• Ocean warming (OW) negatively impacts cephalopods across all life stages and lineages (octopuses, squids, cuttlefish).
• Ocean acidification (OA) showed more limited effects.
• Contrary to expectations, cephalopods are not universally benefiting from changing ocean conditions.

Conclusions:

• OW is a significant threat to cephalopods, challenging the "climate change winners" hypothesis.
• Most research focuses on OW and early life stages of temperate species.
• Further research is needed on diverse taxa, climates, life stages, and other stressors like deoxygenation.