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Low temperature sensitivity of picophytoplankton P : B ratios and growth rates across a natural 10°C temperature gradient in the oligotrophic Indian Ocean
Limnology and Oceanography Letters ( IF 7.8 ) Pub Date : 2021-11-18 , DOI: 10.1002/lol2.10224
Michael R. Landry 1 , Karen E. Selph 2 , Raleigh R. Hood 3 , Claire H. Davies 4 , Lynnath E. Beckley 5
Affiliation  

We investigated temperature sensitivities of picophytoplankton growth along a natural 10°C (18–28°C) temperature gradient in the eastern Indian Ocean characterized by deep mixing and consistently low dissolved nitrogen. Population biomass (B), cell carbon, and chlorophyll were measured by flow cytometry. Instantaneous growth (μ) and production (P) were calculated from dilution incubations at four light levels. Contrary to most empirical and theoretical predictions, Prochlorococcus, the biomass dominant, showed insignificant temperature sensitivity, with nominal Q10 values of 1.06 and 1.18 for P : B and μ, respectively, and activation energies (Ea) of 0.05 and 0.12 eV. Q10 and Ea values for Synechococcus (1.36–1.42 and 0.23–0.27 eV) were also below prediction, and picoeukaryotes showed high variability, including negative rates suggesting lytic cycles, at high temperature. We emphasize the importance of using adapted communities in natural environmental gradients to test climate predictions and hypothesize that mortality defenses are a significant selection criterion in balanced oligotrophic systems.

中文翻译:

在贫营养印度洋自然 10°C 温度梯度下,微型浮游植物 P:B 比率和生长速率的低温敏感性

我们研究了印度洋东部沿自然 10°C(18-28°C)温度梯度生长的微型浮游植物生长的温度敏感性,其特征是深度混合和始终如一的低溶解氮。通过流式细胞术测量种群生物量 (B)、细胞碳和叶绿素。瞬时生长 ( μ ) 和生产 (P) 从四个光照水平的稀释培养中计算。与大多数经验和理论预测相反,生物量占主导地位的Prochlorococcus显示出微不足道的温度敏感性, P : B 和μ的标称Q 10值分别为 1.06 和 1.18 ,活化能 ( E a ) 为 0.05 和 0.12 eV。Synechococcus的10E a值(1.36-1.42 和 0.23-0.27 eV)也低于预期,并且在高温下,微小核生物表现出高变异性,包括表明裂解周期的负率。我们强调在自然环境梯度中使用适应群落来测试气候预测的重要性,并假设死亡率防御是平衡贫营养系统中的一个重要选择标准。
更新日期:2021-11-18
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