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Particle-attached Microbes in Eelgrass Vegetation Areas Differ in Community Structure Depending on the Distance from the Eelgrass Bed.
Zostera marina (eelgrass) is a submerged flowering plant often found in the coastal areas of Japan. Large amounts of suspended particles form in highly productive environments, such as eelgrass beds, and the behavior of these particles is expected to affect the surrounding microbial community. We investigated the microbial community structure of suspended particles in three eelgrass fields (Ikuno-Shima Is., Mutsu Bay, and Nanao Bay) and inferred the formation and dynamics of suspended particles from a microbial community structure ana-lysis. Seawater samples were collected directly above each eelgrass bed (eelgrass-covering) and from locations dozens of meters away from the eelgrass bed (bare-ground). In consideration of the two different lifestyles of marine microbes, microbial communities were obtained from particle-attached (PA) and free-living (FL) states. Differences in microbial diversity and community structures were observed between PA and FL in all eelgrass beds. The FL microbial community was similar between the two sampling points (eelgrass-covering and bare-ground), whereas a significant difference was noted in the microbial community structure of suspended particles between the two sampling points. This difference appeared to be due to the supply of organic matter from the eelgrass sea ground and leaf-attached detritus produced by microbial activity. In addition, the classes Flavobacteriia, Alphaproteobacteria, and Gammaproteobacteria were abundant in the PA and FL fractions. Furthermore, many sequences of the key groups (e.g., Planctomycetes and Verrucomicrobia) were exclusively detected in the PA fraction, in which they may circulate nutrients. The present results provide insights into the microbial communities of suspended particles and provide the first step towards understanding their biogeochemical impact on the eelgrass bed.
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