The current global redistribution of biota is often attributed to two main drivers: contemporary climate change (CCC) and non-indigenous species (NIS). Despite evidence of synergetic effects, however, studies assessing long-term effects of CCC conditions on NIS fitness remain rare. We examined the interactive effects of warming, ocean acidification and reduced salinity on the globally distributed marine NIS Magallana gigas (Pacific oyster) over a ten-month period. Growth, clearance and oxygen consumption rates were measured monthly to assess individual fitness. Lower salinity had a significant, permanent effect on M. gigas, reducing and increasing clearance and oxygen consumption rates, respectively. Neither predicted increases in seawater temperature nor reduced pH had a long-term physiological effect, indicating conditions predicted for 2100 will not affect adult physiology and survival. These results suggest that M. gigas will remain a globally successful NIS and predicted CCC will continue to facilitate their competitive dominance in the near future.

当前全球生物群的重新分布通常归因于两个主要驱动因素：当代气候变化 (CCC) 和非本土物种 (NIS)。然而，尽管有协同效应的证据，但评估 CCC 条件对 NIS 适应性的长期影响的研究仍然很少。在十个月的时间里，我们研究了变暖、海洋酸化和盐度降低对全球分布的海洋 NIS Magallana gigas（太平洋牡蛎）的交互影响。每月测量生长率、清除率和耗氧率，以评估个人健康状况。较低的盐度对M. gigas有显着的永久性影响，分别减少和增加清除率和耗氧率。预测的海水温度升高和 pH 值降低都没有长期生理影响，表明预测的 2100 年条件不会影响成体的生理和存活。这些结果表明M. gigas仍将是全球成功的 NIS，预计 CCC 将在不久的将来继续促进其竞争优势。