| Summary: | Despite the increasing recognition and importance surrounding bacterial and fungal interactions, and their critical contributions to ecosystem functioning and host fitness, studies examining their co-occurrence remain in their infancy. Similarly, studies have yet to characterise the bacterial and fungal communities associated with nudibranchs or their core microbial members. Doing this can advance our understanding of how the microbiome helps a host adapt and persist in its environment. In this study, we characterised the bacterial and fungal communities associated with 46 <i>Pteraeolidia semperi</i> nudibranch individuals collected from four offshore islands in Singapore. We found no distinct spatial structuring of microbial community, richness, or diversity across sampling locations. The bacterial genera <i>Mycoplasma</i> and <i>Endozoicomonas</i> were found across all samples and islands. The fungal genus <i>Leucoagaricus</i> was found with the highest occurrence, but was not found everywhere, and this is the first record of its reported presence in marine environments. The co-occurrence network suggests that bacterial and fungal interactions are limited, but we identified the bacterial family <i>Colwelliaceae</i> as a potential keystone taxon with its disproportionately high number of edges. Furthermore, <i>Colwelliaceae</i> clusters together with other bacterial families such as <i>Pseudoalteromonadaceae</i> and <i>Alteromonadaceae</i>, all of which have possible roles in the digestion of food.
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