Departamento de Ecología, Facultad de Ciencias, Universidad de Granada, 18071, Granada, Spain.
Instituto del Agua, Universidad de Granada, 18071, Granada, Spain.
Sci Rep. 2018 Jul 6;8(1):10278. doi: 10.1038/s41598-018-28543-2.
Algal-bacterial interactions include mutualism, commensalism, and predation. However, how multiple environmental conditions that regulate the strength and prevalence of a given interaction remains unclear. Here, we test the hypothesis that the prevailing algal-bacterial interaction shifted in two years (2005 versus 2015), due to increased temperature (T) and Saharan dust depositions in high-mountain lakes of Sierra Nevada (S Spain). Our results support the starting hypothesis that the nature of the prevailing algal-bacterial interaction shifted from a bacterivory control exerted by algae to commensalism, coinciding with a higher air and water T as well as the lower ratio sestonic nitrogen (N): phosphorous (P), related to greater aerosol inputs. Projected global change conditions in Mediterranean region could decline the functional diversity and alter the role of mixotrophy as a carbon (C) by-pass in the microbial food web, reducing the biomass-transfer efficiency up the web by increasing the number of trophic links.
藻菌相互作用包括共生、共栖和捕食。然而，调节特定相互作用强度和普遍性的多种环境条件仍不清楚。在这里，我们检验了这样一个假设，即在过去两年（2005 年与 2015 年），由于气温升高和撒哈拉沙漠尘埃在西班牙内华达山脉高山湖泊中的沉积，主导的藻菌相互作用发生了转变。我们的研究结果支持这样一个假设，即藻菌相互作用的性质从藻类控制的细菌捕食转变为共栖，这与更高的空气和水温和更低的营养盐比（氮：磷）有关，这与气溶胶输入的增加有关。地中海地区预计的全球变化条件可能会降低功能多样性，并改变混合营养作用作为微生物食物网中碳（C）旁路的作用，通过增加营养级联的数量来降低食物网中生物量转移效率。
