Phylogenetic Responses of Marine Free-Living Bacterial Community to Phaeocystis globosa Bloom in Beibu Gulf, China

Abstract

Phaeocystis globosa blooms are recognized as playing an essential role in shaping the structure of the marine community and its functions in marine ecosystems. In this study, we observed variation in the alpha diversity and composition of marine free-living bacteria during P. globosa blooms and identified key microbial community assembly patterns during the blooms. The results showed that the Shannon index was higher before the blooming of P. globosa in the subtropical bay. Marinobacterium (γ-proteobacteria), Erythrobacter (α-proteobacteria), and Persicobacter (Cytophagales) were defined as the most important genera, and they were more correlated with environmental factors at the terminal stage of P. globosa blooms. Furthermore, different community assembly processes were observed. Both the mean nearest relatedness index (NRI) and nearest taxon index (NTI) revealed the dominance of deterministic factors in the non-blooming and blooming periods of P. globosa, while the bacterial communities in marine waters after the blooms tended to be controlled by stochastic factors. Our findings revealed that the assembly of the bacterial community in marine P. globosa blooms is a complex process with mixture effects of marine microbiomes and environmental parameters.

Trophic states regulate assembly processes and network structures of small chromophytic phytoplankton communities in subtropical coastal ecosystem

“…Increasing evidence has shown that disturbance could select species exhibiting speci c biological traits and markedly alter the composition of SCP community (Li et al, 2020;Stegen et al, 2012). A high relative abundance of Thalassiosira, Pseudo-nitzschia and Skeletonema, were observed and widely spread in the heavy eutrophication Maowei Sea, whereas Thalassiosira, Minutocellus, Navicula, and Chaetoceros were signi cantly over-dominated in the Qinzhou Bay and Beibu Gulf open sea as eutrophic states decreased, which is consistent with previous studies (Leruste et al, 2019;Tian et al, 2017).…”

Trophic States Regulate Assembly Processes and Network Structures of Picophytoplankton Communities in Subtropical Coastal Ecosystems

“…8b & 8d) that was signi cantly affected by nitrogen concentration, salinity, and temperature. Increasing evidence has shown that disturbance could select species exhibiting speci c biological traits and markedly alter the composition of picophytoplankton community [31,32]. A high relative abundance of Rhodophyta was observed and widely spread in the heavy eutrophication Maowei Sea, whereas Bacillariophyta was signi cantly over-dominated in the Qinzhou Bay and Beibu Gulf open sea as eutrophic states decreased, which is consistent with previous studies [33,34].…”

Spatiotemporal dynamics of marine microbial communities following a Phaeocystis bloom: biogeography and co‐occurrence patterns

“…Further, PO 4 3− and SiO 3 2− were positively correlated with the microbial communities in April and June, and negatively correlated with the communities in March. Indeed, similar temporal variations of FL microbial communities associated with nutrients have been observed (Li et al ., 2020), manifesting the impacts of environmental factors on the succession of the microbial community during P. globosa blooms.…”

“…The spatial factors played a slightly stronger role in shaping the total communities (VPA analysis) as a minor proportion (13.01%) of community variation explained by PCNM variables, and similar microbial dispersal limitations between distant environments had also been observed (Zhang et al ., 2014; Jiao et al ., 2017). Moreover, the abundance of P. globosa cells and environmental variables simultaneously accounted for 8.47% of the variation, suggesting that they may be dependent on each other to some extent (Li et al ., 2020). Overall, the biogeography of the total microbial communities was driven by strong environmental selection and weak dispersal‐related processes, and the influence of the P. globosa bloom cannot be neglected.…”

“…The selective processes can not only be executed by environmental parameters, but also and perhaps more importantly, by biotic interactions, particularly algal‐bacteria interactions. The diversity and community composition of bacterioplankton were significantly influenced by Phaeocystis globosa (Prymnesiophyceae) spring bloom events in the southern North Sea and southern China Sea (Wemheuer et al ., 2015; Li et al ., 2020), and the bacterioplankton also affected the development of a P. globosa bloom by microbial remineralization (Sheik et al ., 2014; Tan et al ., 2016). The alga P. globosa can produce large gelatinous colonies with hundreds to thousands of cells embedded in a mucus matrix (Schoemann et al ., 2005; Spilmont et al ., 2009).…”