Aquatic EcoHealth Group, Fujian Key Laboratory of Watershed Ecology, Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Aquatic EcoHealth Group, Fujian Key Laboratory of Watershed Ecology, Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; College of Fisheries, Henan Normal University, Xinxiang 453007, China.
Sci Total Environ. 2022 Feb 1;806(Pt 4):150897. doi: 10.1016/j.scitotenv.2021.150897. Epub 2021 Oct 12.
With the effects of global warming becoming ever more obvious, biodiversity conservation is facing severe challenges. Currently, a deeper understanding the mechanisms of the effects of warming on sensitive species has become an important topic in aquatic biodiversity and ecological management. Our study first overcame the "challenge" for a sensitive indicator species (Netzelia tuberspinifera, an endemic testate amoeba species in East Asia) of culturing under laboratory conditions, and then explored its molecular response mechanisms to warming using transcriptomic analysis. Our data indicate that temperature mainly drove the geographical and seasonal variation of N. tuberspinifera populations. Transcriptomic results indicate that when the temperature is <25 °C, rising temperature triggers the biosynthesis of ribosomes; while the temperature is >25 °C, it triggers molecular processes related with cell division, test formation and general biomass increase. However, once the temperature exceeds 40 °C, N. tuberspinifera is unable to survive. Following from these results, the distribution of N. tuberspinifera might expand towards higher altitude or latitude regions under global warming. For the first time, our study showed direct evidence for sensitive protozoa species that presents a very narrow adaptation mechanism to local climate. Our work provides fundamental data for regional biodiversity conservation and scientific reference in subtropical and tropical waterbodies.
随着全球变暖的影响日益明显，生物多样性的保护正面临着严峻的挑战。目前，深入了解变暖对敏感物种的影响机制已成为水生生物多样性和生态管理的一个重要课题。我们的研究首先克服了实验室条件下培养一种敏感指示物种（东亚特有盘状网纹藻）的“挑战”，然后利用转录组分析探讨了其对变暖的分子响应机制。我们的数据表明，温度主要驱动了 N. tuberspinifera 种群的地理和季节性变化。转录组结果表明，当温度<25°C 时，温度升高会触发核糖体的生物合成；而当温度>25°C 时，它会触发与细胞分裂、壳形成和总体生物量增加相关的分子过程。然而，一旦温度超过 40°C，N. tuberspinifera 就无法生存。根据这些结果，在全球变暖的情况下，N. tuberspinifera 的分布可能会向高海拔或高纬度地区扩展。本研究首次为适应本地气候的机制非常狭窄的敏感原生动物物种提供了直接证据。我们的工作为亚热带和热带水体的区域生物多样性保护和科学参考提供了基础数据。
