CO2-driven decrease in pH disrupts olfactory behaviour and increases individual variation in deep-sea hermit crabs@en

Deep-sea species are generally thought to be less tolerant of environmental variation than shallow-living species due to the relatively stable conditions in deep waters for most parameters (e.g. temperature, salinity, oxygen, and pH). To explore the potential for deep-sea hermit crabs (Pagurus tanneri) to acclimate to future ocean acidification, we compared their olfactory and metabolic performance under ambient (pH 7.6) and expected future (pH 7.1) conditions. After exposure to reduced pH waters, metabolic rates of hermit crabs increased transiently and olfactory behaviour was impaired, including antennular flicking and prey detection. Crabs exposed to low pH treatments exhibited higher individual variation for both the speed of antennular flicking and speed of prey detection, than observed in the control pH treatment, suggesting that phenotypic diversity could promote adaptation to future ocean acidification.由于深海绝大多数环境参数（如温度、盐度、溶解氧、pH）的条件相对稳定，学界普遍认为深海物种相较于浅海物种，对环境变化的耐受能力更弱。为探究深海寄居蟹（*Pagurus tanneri*）适应未来海洋酸化的驯化潜力，本研究对比了其在当前环境（pH 7.6）与预期未来海洋环境（pH 7.1）下的嗅觉与代谢表现。经低pH水体暴露后，寄居蟹的代谢速率呈现暂时性升高，且嗅觉行为受损，包括小触角摆动与猎物探测能力受抑。相较于pH 7.6的对照组，经低pH处理的寄居蟹，其小触角摆动速率与猎物探测速率的个体间差异均更为显著，这表明表型多样性可助力生物适应未来海洋酸化。