British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge, CB3 0ET, UK.
School of Ocean Sciences, Bangor University, Menai Bridge, Anglesey, LL59 5AB, UK.
Nat Commun. 2019 Jul 29;10(1):3383. doi: 10.1038/s41467-019-11348-w.
Marine encrusting communities play vital roles in benthic ecosystems and have major economic implications with regards to biofouling. However, their ability to persist under projected warming scenarios remains poorly understood and is difficult to study under realistic conditions. Here, using heated settlement panel technologies, we show that after 18 months Antarctic encrusting communities do not acclimate to either +1 °C or +2 °C above ambient temperatures. There is significant up-regulation of the cellular stress response in warmed animals, their upper lethal temperatures decline with increasing ambient temperature and population genetic analyses show little evidence of differential survival of genotypes with treatment. By contrast, biofilm bacterial communities show no significant differences in community structure with temperature. Thus, metazoan and bacterial responses differ dramatically, suggesting that ecosystem responses to future climate change are likely to be far more complex than previously anticipated.
海洋附生生物群落对底栖生态系统起着至关重要的作用，并且在生物污损方面具有重大的经济意义。然而，它们在预计的变暖情景下持续存在的能力仍然知之甚少，并且在现实条件下很难进行研究。在这里，我们使用加热沉降板技术表明，在 18 个月后，南极附生生物群落不会适应环境温度升高 1°C 或 2°C。在变暖的动物中，细胞应激反应显著上调，它们的最高致死温度随着环境温度的升高而下降，种群遗传分析几乎没有证据表明处理后基因型的存活率有差异。相比之下，生物膜细菌群落的结构随温度没有明显差异。因此，后生动物和细菌的反应差异很大，这表明生态系统对未来气候变化的反应可能比以前预期的要复杂得多。
