Organ-specific bacterial communities of the soft-shell clam Mya arenaria (Linnaeus, 1758) and adjacent sediments in the Black Sea
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2025
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Frontiers Media SA
Resumen
Bacteria colonizing bivalves play a critical role in host health by supporting
digestion, nutrient cycling, and immune defense. While the microbiomes of
marine bivalves have been studied globally, their diversity and functional roles
across specific organs remain underexplored. This study investigates the
structural and predicted functional diversity of bacterial communities
associated with different organs (siphon, gills, and stomach) of the marine
bivalve Mya arenaria Linnaeus, 1758, along with the surrounding sediments
from the Romanian Black Sea coast, using 16S rRNA gene sequencing with
Illumina technology. Bacterial communities within the bivalve differed markedly
from those in the sediments and varied across organs. Sediment samples
exhibited greater taxonomic diversity (19 phyla) than bivalve organs (14–15
phyla). Verrucomicrobiota dominated the siphon and gills, Spirochaetota were
most abundant in the stomach, and Desulfobacterota predominated in
sediments. Nitrate-reducing bacteria, particularly those from the genus
Persicirhabdus, were prevalent in all organs and may contribute to host
resilience under hypoxic conditions. The presence of Sulfurimonas in the
stomach suggests a possible nutritional association, while halotolerant
Woeseia species identified in sediments likely play a role in environmental
nutrient cycling. Predictive functional profiling indicated potential bacterial
involvement in various metabolic processes, including carbohydrate, amino
acid, and energy metabolism. Additionally, pathways related to xenobiotic
degradation and antibiotic biosynthesis were inferred across all sample types,
indicating a potential capacity for broader ecological and possibly
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invertebrates’ bacteria, Mya arenaria microbiome, Black Sea bivalve, Illumina sequencing, 16S rRNA gene