Shifting from Right to Left: The Combined Effect of Elevated CO(2) and Temperature on Behavioural Lateralization in a Coral Reef Fish

Recent studies have shown that elevated CO(2) can affect the behaviour of larval and juvenile fishes. In particular, behavioural lateralization, an expression of brain functional asymmetries, is affected by elevated CO(2) in both coral reef and temperate fishes. However, the potentially interacting effects of rising temperatures and CO(2) on lateralization are unknown. Here, we tested the combined effect of near-future elevated-CO(2) concentrations (930 µatm) and temperature variation on behavioural lateralization of a marine damselfish, Pomacentrus wardi. Individuals exposed to one of four treatments (two CO(2) levels and two temperatures) were observed in a detour test where they made repeated decisions about turning left or right. Individuals exposed to current CO(2) and ambient temperature levels showed a significant right-turning bias at the population level. This biased was reversed (i.e. to the left side) in fish exposed to the elevated-CO(2) treatment. Increased temperature attenuated this effect, resulting in lower values of relative lateralization. Consequently, rising temperature and elevated CO(2) may have different and interactive effects on behavioural lateralization and therefore future studies on the effect of climate change on brain functions need to consider both these critical variables in order to assess the potential consequences for the ecological interactions of marine fishes.