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The dynamics of picocyanobacteria from a hypereutrophic shallow lake is affected by light-climate and small-bodied zooplankton: a 10-year cytometric time-series analysis
FEMS Microbiology Ecology ( IF 4.2 ) Pub Date : 2021-03-30 , DOI: 10.1093/femsec/fiab055
María Victoria Quiroga 1 , Paula Huber 1, 2 , Juliana Ospina-Serna 1 , Nadia Diovisalvi 1 , Mariana Odriozola 1 , Gerardo R Cueto 3 , Leonardo Lagomarsino 1 , Paulina Fermani 1 , José Bustingorry 1 , Roberto Escaray 1 , Horacio Zagarese 1 , Fernando Unrein 1
Affiliation  

In aquatic systems, an interplay between bottom-up and top-down processes determines the dynamic of picocyanobacteria (Pcy) abundance and community structure. Here, we analyzed a 10-year time series (sampled fortnightly) from a hypereutrophic turbid shallow lake located within the Pampa Region of South America, generating the first long-term record of freshwater Pcy from the Southern Hemisphere. We used a cytometric approach to study Pcy community, and focused on its relations with nutrient and light conditions (bottom-up) and potential grazers (top-down). A novel Pcy abundance seasonality with winter maximums was observed for years with relatively stable hydrological levels, related with decreased abundance of seasonal rotifers during colder seasons. Pcy showed lower abundance and higher cytometric alpha diversity during summer, probably due to a strong predation exerted by rotifers. In turn, a direct effect of the non-seasonal small cladocerans Bosmina spp. decreased Pcy abundance and induced a shift from single-cell Pcy into aggregated forms. This structuring effect of Bosmina spp. was further confirmed by Pcy cytometric (dis)similarity analyses from the time series and in situ experimental data. Remarkably, Pcy showed acclimatization to underwater light variations, resembling the relevance of light in this turbid system.

中文翻译:

富营养化浅水湖泊中的蓝藻细菌的动力学受光气候和小型浮游动物的影响:十年的细胞计数时间序列分析

在水生系统中,自下而上和自上而下的过程之间的相互作用决定了微蓝藻细菌(Pcy)丰度和群落结构的动态。在这里,我们分析了南美洲潘帕地区内一个富营养性浑浊浅湖的10年时间序列(每两周采样一次),产生了南半球淡水Pcy的第一个长期记录。我们使用细胞计数法研究了Pcy群落,并重点研究了其与养分和光照条件(自下而上)和潜在放牧者(自上而下)的关系。在相对稳定的水文水平下,多年来观察到了一种新颖的Pcy丰度季节性特征,具有冬季最大值,这与寒冷季节中季节轮虫的丰度降低有关。Pcy在夏季表现出较低的丰度和较高的细胞计数α多样性,可能是由于轮虫强捕食。反过来,非季节性小锁骨的直接作用波斯尼亚种 降低了Pcy的丰度,并导致从单细胞Pcy转变为聚集形式。Bosmina spp的这种结构作用。通过时间序列和原位实验数据进行的Pcy细胞计数(异)相似性分析进一步证实了这一点。值得注意的是,Pcy表现出了对水下光变化的适应能力,类似于该浑浊系统中光的相关性。
更新日期:2021-05-05
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