Multi-year assessment of coastal planktonic fungi reveals environmental drivers of diversity and abundance
Multi-year assessment of coastal planktonic fungi reveals environmental drivers of diversity and abundance
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DOI：
10.1038/ismej.2016.24
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发表时间：
2016-09-01
期刊：
影响因子：
11
通讯作者：
Cunliffe, Michael
中科院分区：
文献类型：
--
作者：
Taylor, Joe D.;Cunliffe, Michael
迄今为止，浮游真菌一直是远洋海洋生态系统中一个被忽视的组成部分，相对于其他浮游生物群体，对它的研究很少。目前，人们对浮游真菌多样性如何随时间变化以及控制环境驱动因素的身份缺乏了解。利用真菌特异性高通量测序和定量PCR对英国普利茅斯沿海生物多样性时间序列站点L4收集的浮游生物DNA样本进行了6年的分析，我们评估了浮游生物多样性和丰度与共同发生的环境变量的时间变化。L4站浮游真菌的多样性以子囊菌门、担子菌门和壶菌门为主，这些门内的几个目经常丰富，并在多年内处于优势地位。重复的年际浮游菌华与潜在的控制环境驱动因素有关，包括氮的可用性和温度。真菌浮游生物和其他浮游生物群体之间的特殊关系也被确定，季节性壶菌华与硅藻华在连续的年份相匹配。在L4站盐度降低期间，浮游菌a多样性最大，表明河流对生态系统的输入。在盐度降低期间，以及潜在的底物可利用性增加时，包括颗粒有机物，浮游真菌丰度也增加。本研究已经确定了沿海海洋生态系统中浮游真菌多样性和丰度的可能控制环境驱动因素，从而为一种神秘的海洋浮游生物群的生物学和生态学提供了新的视角。浮游真菌具有几种潜在的功能作用，包括腐养生物和寄生虫，现在应在关于远洋生态系统功能和服务的共识观点中加以考虑。
Mycoplankton have so far been a neglected component of pelagic marine ecosystems, having been poorly studied relative to other plankton groups. Currently, there is a lack of understanding of how mycoplankton diversity changes through time, and the identity of controlling environmental drivers. Using Fungi-specific high-throughput sequencing and quantitative PCR analysis of plankton DNA samples collected over 6 years from the coastal biodiversity time series site Station L4 situated off Plymouth (UK), we have assessed changes in the temporal variability of mycoplankton diversity and abundance in relation to co-occurring environmental variables. Mycoplankton diversity at Station L4 was dominated by Ascomycota, Basidiomycota and Chytridiomycota, with several orders within these phyla frequently abundant and dominant in multiple years. Repeating interannual mycoplankton blooms were linked to potential controlling environmental drivers, including nitrogen availability and temperature. Specific relationships between mycoplankton and other plankton groups were also identified, with seasonal chytrid blooms matching diatom blooms in consecutive years. Mycoplankton a-diversity was greatest during periods of reduced salinity at Station L4, indicative of riverine input to the ecosystem. Mycoplankton abundance also increased during periods of reduced salinity, and when potential substrate availability was increased, including particulate organic matter. This study has identified possible controlling environmental drivers of mycoplankton diversity and abundance in a coastal sea ecosystem, and therefore sheds new light on the biology and ecology of an enigmatic marine plankton group. Mycoplankton have several potential functional roles, including saprotrophs and parasites, that should now be considered within the consensus view of pelagic ecosystem functioning and services.