Urban Mangroves Under Threat: Metagenomic Analysis Reveals a Surge in Human and Plant Pathogenic Fungi

Coastal ecosystems are increasingly threatened by climate change and anthropogenic pressures, which can disrupt microbial communities and favor the emergence of pathogenic organisms. In this study, we applied metagenomic analysis to characterize fungal communities in sediment samples from an urban mangrove subjected to environmental stress. The results revealed a fungal community with reduced richness-28% lower than expected for similar ecosystems-likely linked to physicochemical changes such as heavy metal accumulation, acidic pH, and eutrophication, all typical of urbanized coastal areas. Notably, we detected an increase in potentially pathogenic genera, including <i>Candida</i>, <i>Aspergillus</i>, and <i>Pseudoascochyta</i>, alongside a decrease in key saprotrophic genera such as <i>Fusarium</i> and <i>Thelebolus</i>, indicating a shift in ecological function. The fungal assemblage was dominated by the phyla <i>Ascomycota</i> and <i>Basidiomycota</i>, and despite adverse conditions, symbiotic mycorrhizal fungi remained present, suggesting partial resilience. A considerable fraction of unclassified fungal taxa also points to underexplored microbial diversity with potential ecological or health significance. Importantly, this study does not aim to compare pristine and contaminated environments, but rather to provide a sanitary alert by identifying the presence and potential proliferation of pathogenic fungi in a degraded mangrove system. These findings highlight the sensitivity of mangrove fungal communities to environmental disturbance and reinforce the value of metagenomic approaches for monitoring ecosystem health. Incorporating fungal metagenomic surveillance into environmental management strategies is essential to better understand biodiversity loss, ecological resilience, and potential public health risks in degraded coastal environments.