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Importance of mixotrophic flagellates during the ice-free season in lakes located along an elevational gradient
Aquatic Sciences ( IF 2.4 ) Pub Date : 2019-04-16 , DOI: 10.1007/s00027-019-0643-2
Anna Waibel 1 , Hannes Peter 1, 2 , Ruben Sommaruga 1
Affiliation  

Mixotrophy seems to be widespread among phytoplankton, but whether this strategy is more relevant in oligotrophic lakes remains unclear. Here, we tested the hypothesis that the relative abundance of mixotrophic flagellates in lakes increases along an elevational gradient paralleling increasingly oligotrophic conditions. For this purpose, 12 lakes located between 575 and 2796 m above sea level were sampled in summer and fall to include two different seasonal windows in phytoplankton dynamics and environmental conditions. The degree of mixotrophy in phytoplankton was estimated in tracer experiments using fluorescently-labeled bacteria and done with composite samples collected in the euphotic zone and in samples obtained from the chlorophyll-a maximum. The results indicated the existence of a positive trend particularly in summer in the relative abundance of mixotrophic flagellates with elevation, however, this trend was not linear, and exceptions along the elevational gradient were found. Changes in the relative abundance of mixotrophic flagellates were related with significant changes in water transparency, DOC and phosphorus concentrations, as well as in bacterial and flagellate abundance. Overall, our results reveal that the harsh growth conditions found in oligotrophic high mountain lakes favor a mixotrophic trophic strategy among phytoplankton.

中文翻译:

在无冰季节,沿海拔梯度的湖泊中混合营养鞭毛虫的重要性

混合营养似乎在浮游植物中很普遍,但这种策略在贫营养湖泊中是否更相关仍不清楚。在这里,我们测试了湖泊中混合营养鞭毛虫的相对丰度沿着海拔梯度增加的假设,平行于日益贫营养的条件。为此,在夏季和秋季对海拔 575 至 2796 m 之间的 12 个湖泊进行了采样,其中包括浮游植物动态和环境条件的两个不同季节窗口。浮游植物的混合营养程度在使用荧光标记细菌的示踪剂实验中估计,并使用在透光区收集的复合样品和从叶绿素-a 最大值获得的样品中完成。结果表明,随着海拔的升高,混合营养鞭毛虫的相对丰度存在正趋势,特别是在夏季,但这种趋势不是线性的,并且沿海拔梯度发现了异常。混养鞭毛虫相对丰度的变化与水透明度、DOC 和磷浓度以及细菌和鞭毛虫丰度的显着变化有关。总的来说,我们的结果表明,在贫营养高山湖泊中发现的恶劣生长条件有利于浮游植物中的混合营养策略。混养鞭毛虫相对丰度的变化与水透明度、DOC 和磷浓度以及细菌和鞭毛虫丰度的显着变化有关。总的来说,我们的结果表明,在贫营养高山湖泊中发现的恶劣生长条件有利于浮游植物中的混合营养策略。混养鞭毛虫相对丰度的变化与水透明度、DOC 和磷浓度以及细菌和鞭毛虫丰度的显着变化有关。总的来说,我们的结果表明,在贫营养高山湖泊中发现的恶劣生长条件有利于浮游植物中的混合营养策略。
更新日期:2019-04-16
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