CO₂-driven ocean acidification affects many aspects of sea urchin biology. However, even in the same species, OA effects are often not univocal due to non-uniform exposure setups or different ecological history of the experimental specimens. In the present work, two groups of adult sea urchins Paracentrotus lividus from different environments (the Lagoon of Venice and a coastal area in the Northern Adriatic Sea) were exposed to OA in a long-term exposure. Animals were maintained for six months in both natural seawater (pH_T 8.04) and end-of-the-century predicted condition (-0.4 units pH). Monthly, physiological (respiration rate, ammonia excretion, O:N ratio) and behavioural (righting, sheltering) endpoints were investigated. Both pH and time of exposure significantly influenced sea urchin responses, but differences between sites were highlighted, particularly in the first months. Under reduced pH, ammonia excretion increased and O:N decreased in coastal specimens. Righting and sheltering were impaired in coastal animals, whereas only righting decreased in lagoon ones. These findings suggested a higher adaptation ability in sea urchins from a more variable environment. Interestingly, as the exposure continued, animals from both sites were able to acclimate. Results revealed plasticity in the physiological and behavioural responses of sea urchins under future predicted OA conditions.

CO ₂驱动的海洋酸化影响海胆生物学的许多方面。但是，即使在同一物种中，由于不均匀的暴露设置或实验标本的不同生态史，OA效应通常也不是显而易见的。在目前的工作中，来自不同环境的两个成年海胆Paracentrotus lividus（威尼斯泻湖和亚得里亚海北部沿海地区）长期暴露于OA。在两种天然海水（pH _T8.04）和世纪末的预测条件（-0.4单位pH）。研究了每月，生理（呼吸速率，氨气排泄，O：N比）和行为（扶正，庇护）终点。pH和暴露时间都显着影响海胆反应，但突出显示了站点之间的差异，尤其是在最初的几个月中。在降低的pH值下，沿海标本的氨排泄增加，O：N减少。沿海动物的扶正和庇护受到损害，而泻湖动物的扶正和庇护却减少了。这些发现表明，在变化多端的环境中，海胆具有更高的适应能力。有趣的是，随着暴露的继续，两个地点的动物都能够适应。