Phytoplankton cell size reduction in response to warming mediated by nutrient limitation.
Phytoplankton cell size reduction in response to warming mediated by nutrient limitation.
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浮游植物细胞的大小减少，响应于养分限制介导的变暖。
DOI：
10.1371/journal.pone.0071528
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发表时间：
2013
期刊：
影响因子：
3.7
通讯作者：
Sommer U
中科院分区：
文献类型：
--
作者：
Peter KH;Sommer U
身体尺寸的缩小被认为是生物对全球气候变暖的普遍反应之一。使用浮游植物作为实验模型系统支持变暖对体型的负面影响，但仍有争议的是，温度升高下的尺寸减小是直接的温度效应还是间接效应介导的尺寸选择性放牧或增强营养限制的变化，这应该有利于更小的细胞尺寸。在这里，我们提出了一个实验，温度和营养胁迫的因子组合表明，大多数温度对浮游植物细胞大小的影响是通过营养胁迫介导的。这是发现社区平均细胞大小和细胞大小的大多数物种的分析。在最高水平的营养胁迫下，群落平均细胞大小每°C下降46%，而在最低水平的营养胁迫下仅下降4.7%。个别物种在质量上表现出相同的趋势，但每摄氏度的收缩较小。总体而言，我们的结果支持了温度对细胞大小的影响在很大程度上是由营养限制介导的假设。在田间条件下，由于表层沃茨温度较高，养分的垂直迁移减少，这种影响预计会加剧。
Shrinking of body size has been proposed as one of the universal responses of organisms to global climate warming. Using phytoplankton as an experimental model system has supported the negative effect of warming on body-size, but it remains controversial whether the size reduction under increasing temperatures is a direct temperature effect or an indirect effect mediated over changes in size selective grazing or enhanced nutrient limitation which should favor smaller cell-sizes. Here we present an experiment with a factorial combination of temperature and nutrient stress which shows that most of the temperature effects on phytoplankton cell size are mediated via nutrient stress. This was found both for community mean cell size and for the cell sizes of most species analyzed. At the highest level of nutrient stress, community mean cell size decreased by 46% per °C, while it decreased only by 4.7% at the lowest level of nutrient stress. Individual species showed qualitatively the same trend, but shrinkage per °C was smaller. Overall, our results support the hypothesis that temperature effects on cell size are to a great extent mediated by nutrient limitation. This effect is expected to be exacerbated under field conditions, where higher temperatures of the surface waters reduce the vertical nutrient transport.
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