In the right place, at the right time: the integration of bacteria into the Plankton Ecology Group model

Background Planktonic microbial communities have critical impacts on the pelagic food web and water quality status in freshwater ecosystems, yet no general model of bacterial community assembly linked to higher trophic levels and hydrodynamics has been assessed. In this study, we utilized a two-year survey of planktonic communities from bacteria to zooplankton on three freshwater reservoirs to investigate their spatiotemporal dynamics. Result We observed the site-specific presence and microdiversification of bacteria in lacustrine and riverine environments, as well as in deep hypolimnia. Moreover, we determined recurrent bacterial seasonal patterns driven by both biotic and abiotic conditions, which could be integrated into the well-known Phytoplankton Ecology Group (PEG) model describing primarily the seasonalities of larger plankton groups. Importantly, bacteria with different ecological potentials showed finely coordinated successions affiliated with four seasonal phases, including t...背景 浮游微生物群落对淡水生态系统的上层水域食物网与水质状况具有关键调控作用，但目前尚无针对与高营养级及水动力过程相关联的细菌群落构建机制的通用模型研究。本研究针对三座淡水水库开展为期两年的监测，覆盖从细菌到浮游动物的全尺寸浮游生物群落，以解析其时空动态变化规律。 结果 本研究观测到细菌在湖相、河相环境以及深水湖下层生境中存在生境特异性定殖与微多样化现象。此外，本研究明确了受生物与非生物因素共同调控的细菌季节性群落循环模式，该模式可纳入经典的浮游植物生态学组（Phytoplankton Ecology Group, PEG）模型——该模型最初主要用于阐释大型浮游生物类群的季节动态。尤为重要的是，具备不同生态功能潜能的细菌类群呈现出精细协调的群落演替过程，其演替可划分为四个季节阶段，包括……