Abstract
ABSTRACT The herbivorous mud skipper, Boleophthalmus pectinirostris and carnivorous eel goby, Odontamblyopus lacepedii are important species in the mudflat ecosystem of the Ariake Sea (Japan). To gain basic knowledge of the ecological and fishery applications of the Ariake tidal flat, an important wetland area, the microbiota of the mudflat and gut contents of B. pectinirostris and O. lacepedii were analysed using 16S rDNA amplicon sequencing. The amplicon sequence variant numbers in the mud and gut of B. pectinirostris and O. lacepedii were 1200, 110, and 140, respectively. The Shannon and Simpson alpha diversity indices of the fish contents were several-fold lower than those of the mud. In mud, Exiguobacteraceae (20%), followed by Anaerolineae (13%), were identified as the predominant bacterial families. In B. pectinirostris gut, Mycoplasmoidaceae (45%) were predominant, followed by Vibrionaceae (28%). In O. lacepedii gut, Desulfovibrionaceae (17%), Brevinemataceae (Spirochaetota) (15%), Vibrionaceae (14%), and Ruminococcaceae (10%) were dominant. These results suggest that, among the wide variety of bacteria in a mud environment, only compatible bacteria can settle in the fish gut. The differences between the two fish species may be due to differences in feeding habitat. The roles of Mycoplasmoidaceae and Brevinemataceae in their hosts are subjects of future research.
Published Version
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