Thermal adaptation, phylogeny, and the unimodal size scaling of marine phytoplankton growth
Thermal adaptation, phylogeny, and the unimodal size scaling of marine phytoplankton growth
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DOI：
10.1002/lno.10094
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发表时间：
2015-07-01
影响因子：
4.5
通讯作者：
Lopez-Urrutia, Angel
中科院分区：
文献类型：
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作者：
Sal, Sofia;Alonso-Saez, Laura;Lopez-Urrutia, Angel
关于浮游植物生长率大小比例的研究通常基于温度校正的生长率或在固定温度下进行的实验，但没有考虑小型和大型物种不同热适应的影响。我们使用一个广泛的数据集的浮游植物生长速率对温度和细胞大小的响应表明，单峰尺度的浮游植物生长强烈依赖于温度，并不显着在高温下，最常见的picophytoplankton物种生长在其最佳状态。此外，我们表明，单峰性的结果从不同的生长速率缩放的picophytoplankton，这是从更大的浮游植物类群不同的genetically。使用核糖体RNA序列，我们重新计算了系统发育广义最小二乘回归的大小缩放异速生长。系统发育校正后，单峰关系是不显着的，在任何温度下，这表明所观察到的曲率反映了picophytoplankton的进化适应通常遇到的贫营养环境中的温暖条件。
Studies on the size-scaling of phytoplankton growth rate are usually based on temperature-corrected growth rates or experiments performed at a fixed temperature, but the effects of differing thermal adaptation of small and large species have not been considered. We use an extensive dataset of phytoplankton growth rate responses to temperature and cell size to show that the unimodal size-scaling of phytoplankton growth depends strongly on temperature, and is not significant at high temperatures where the most common picophytoplankton species grow at their optimum. Furthermore, we show that the unimodality results from the different growth rate scaling of picophytoplankton, which differs phylogenetically from larger phytoplankton taxa. Using ribosomal RNA sequences we recalculated the size-scaling allometry with Phylogenetic Generalized Least Squares regression. After phylogenetic correction, the unimodal relationship is not significant at any temperature, suggesting that the observed curvature reflects the evolutionary adaptation of picophytoplankton to the warm conditions usually encountered in oligotrophic environments.