Department of Aquatic Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Droevendaalsesteeg 10, Wageningen 6871 CM, The Netherlands.
W. K. Kellogg Biological Station, Michigan State University, 3700 E. Gull Lake Drive, Hickory Corners, MI 49060, USA.
Philos Trans R Soc Lond B Biol Sci. 2020 May 11;375(1798):20190706. doi: 10.1098/rstb.2019.0706. Epub 2020 Mar 23.
Predicting the effects of multiple global change stressors on microbial communities remains a challenge because of the complex interactions among those factors. Here, we explore the combined effects of major global change stressors on nutrient acquisition traits in marine phytoplankton. Nutrient limitation constrains phytoplankton production in large parts of the present-day oceans, and is expected to increase owing to climate change, potentially favouring small phytoplankton that are better adapted to oligotrophic conditions. However, other stressors, such as elevated CO, rising temperatures and higher light levels, may reduce general metabolic and photosynthetic costs, allowing the reallocation of energy to the acquisition of increasingly limiting nutrients. We propose that this energy reallocation in response to major global change stressors may be more effective in large-celled phytoplankton species and, thus, could indirectly benefit large-more than small-celled phytoplankton, offsetting, at least partially, competitive disadvantages of large cells in a future ocean. Thus, considering the size-dependent responses to multiple stressors may provide a more nuanced understanding of how different microbial groups would fare in the future climate and what effects that would have on ecosystem functioning. This article is part of the theme issue 'Conceptual challenges in microbial community ecology'.
预测多种全球变化胁迫因素对微生物群落的影响仍然是一个挑战，因为这些因素之间存在复杂的相互作用。在这里，我们探讨了主要全球变化胁迫因素对海洋浮游植物营养获取特性的综合影响。营养限制制约了当今海洋大部分地区的浮游植物生产力，而且由于气候变化，预计这种限制会增加，这可能有利于更适应贫营养条件的小型浮游植物。然而，其他胁迫因素，如 CO2 升高、温度升高和光照水平升高，可能会降低一般代谢和光合作用成本，从而将能量重新分配到获取越来越有限的营养物质上。我们提出，这种对主要全球变化胁迫因素的能量再分配在大细胞浮游植物物种中可能更为有效，因此，至少在一定程度上可以抵消未来海洋中大细胞在竞争中的劣势，从而间接地使大细胞浮游植物受益，而不是小细胞浮游植物。因此，考虑到对多种胁迫因素的大小依赖性响应，可以更细致地了解不同微生物群落在未来气候中的表现如何，以及这将对生态系统功能产生什么影响。本文是主题为“微生物群落生态学的概念挑战”的特刊的一部分。
