Cultivation of different seaweed species and seasonal changes cause divergence of the microbial community in coastal seawaters

Abstract

Although the effects of certain species of seaweed on the microbial community structure have long been a research focus in marine ecology, the response of the microbial community to seasons and different seaweed species is poorly understood. In the present study, a total of 39 seawater samples were collected during 3 months from three zones: Neoporphyra haitanensis cultivation zones (P), Gracilaria lemaneiformis-Saccharina japonica mixed cultivation zones (G), and control zones (C). These samples were then analyzed using 18S and 16S rRNA gene sequencing to ascertain the fungal and bacterial communities, respectively, along with the determination of environmental factors. Our results showed that increased dissolved oxygen (DO), decreased inorganic nutrients, and released dissolved organic matter (DOM) in seaweed cultivation zone predominantly altered the variability of eukaryotic and prokaryotic microbial communities. Certain microbial groups such as Aurantivirga, Pseudomonas, and Woeseia were stimulated and enriched in response to seaweed cultivation, and the enriched microorganisms varied across seaweed cultivation zones due to differences in the composition of released DOM. In addition, seasonal changes in salinity and temperature were strongly correlated with microbial community composition and structure. Our study provides new insights into the interactions between seaweed and microbial communities.

Characterization of persistent marine bacterial community profiles isolated from long-term Kappaphycus alvarezii cultures in a closed cultivation system using 16S rDNA analysis

“…Substantial research evidence strongly supports the functional regulation and assistance of seaweed health and resilience by associated bacteria on the seaweed surface, and their ecological role in the seaweed life cycle (Egan et al, 2013). The surface of seaweed serves as a substrate for numerous microbial communities, which can have a significant impact on the overall health and growth of the seaweed (Xu et al, 2022). In controlled land-based seaweed cultivation systems, it is crucial to investigate these microbial communities that affect the growth and survival of the cultivated seaweed.…”

Diversity of the protease-producing bacteria and their extracellular protease in the coastal mudflat of Jiaozhou Bay, China: in response to clam naturally growing and aquaculture

“…Woeseia genus was considered a core member of the microbial community in the marine ecosystem, which is characterized by the ability to assimilate inorganic carbon (Dyksma et al, 2016). Woeseia strains have been frequently isolated from coastal sediments and coastal seawaters (Du et al, 2016;Xu et al, 2022). Loktanella was reported to be a dominant genus in the coastal microbial community (Cardoso et al, 2019), and large numbers of Loktanella strains have been isolated from tidal flat sediments (Park et al, 2013(Park et al, , 2014Tanaka et al, 2014).…”

Effect of hyposaline stress on the release of dissolved organic carbon from five common macroalgal species

“…The present study suggests hyposaline stress needs to be considered when quantifying DOC release from macroalgae. Besides, a recent study found that macroalgal cultivation shaped the microbial community structure by increasing dissolved oxygen, decreasing inorganic nutrients, and releasing of DOC (Xu et al, 2022). Thus, hyposaline stress may indirectly influence the microbial community structure of the tidal zone.…”