Community-level respiration of prokaryotic microbes may rise with global warming
Community-level respiration of prokaryotic microbes may rise with global warming
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DOI：
10.1038/s41467-019-13109-1
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发表时间：
2019-11-12
影响因子：
16.6
通讯作者：
Pawar, Samrat
中科院分区：
文献类型：
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作者：
Smith, Thomas P.;Thomas, Thomas J. H.;Pawar, Samrat
了解原核生物的代谢率如何对温度做出反应，对于我们了解气候变化如何改变生态系统功能至关重要，因为这些微生物是全球碳排放的主要贡献者。生态代谢理论表明，由于热力学的限制，生活在较高温度下的物种比生活在较冷生态位的物种进化出更高的生长速率。在这里，使用全球原核生物数据集，我们发现在热最佳条件下的最大生长速率随着嗜温生物（最佳温度低于或接近45摄氏度）的温度而增加，但不嗜热生物（大于或接近45摄氏度）。此外，原核生物代谢率的短期（一天内）热响应通常比真核生物对变暖更敏感。由于气候变暖将主要影响中温温度范围内的生态系统，因此我们得出结论，随着微生物群落适应更高的温度，它们的代谢率以及生物量特定的CO2产量将不可避免地上升。使用数学模型，我们说明了这些发现的潜在全球影响。
Understanding how the metabolic rates of prokaryotes respond to temperature is fundamental to our understanding of how ecosystem functioning will be altered by climate change, as these micro-organisms are major contributors to global carbon efflux. Ecological metabolic theory suggests that species living at higher temperatures evolve higher growth rates than those in cooler niches due to thermodynamic constraints. Here, using a global prokaryotic dataset, we find that maximal growth rate at thermal optimum increases with temperature for mesophiles (temperature optima less than or similar to 45 degrees C), but not thermophiles (greater than or similar to 45 degrees C). Furthermore, short-term (within-day) thermal responses of prokaryotic metabolic rates are typically more sensitive to warming than those of eukaryotes. Because climatic warming will mostly impact ecosystems in the mesophilic temperature range, we conclude that as microbial communities adapt to higher temperatures, their metabolic rates and therefore, biomass-specific CO2 production, will inevitably rise. Using a mathematical model, we illustrate the potential global impacts of these findings.