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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/211665
Delivering insights into diversity and ecology of marine chytrids
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[eng] Current knowledge of marine fungi is limited, marked by gaps in the understanding of their diversity, spatio-temporal patterns, and ecological roles within marine ecosystems. The underexplored nature of specific fungal groups, like chytrids occurring during phytoplankton blooms, and the lack of research in most marine regions, such as the Mediterranean Sea, emphasise the need for this thesis. Consequently, the main objective of this doctoral thesis is to investigate the composition of the fungal community in the Mediterranean coastal ecosystem, with a focus on the basal fungal group Chytridiomycota (chytrids). The study sets for specific objectives: i) to evaluate the spatial distribution of Chytridiomycota diversity in various coastal areas during dinoflagellate proliferations; ii) to evaluate the temporal dynamics of the fungal community in epiphytic communities during benthic dinoflagellate proliferations and to investigate their interaction with hosts; and iii) to identify and describe new parasitic Chytridiomycota species associated with their host proliferations. The chytrid community in coastal environments is particularly dynamic and diverse, with a marked specificity towards their preferred hosts. These communities are more diverse and abundant in sediments and on macroalgae surfaces than in the water column. The relative abundance of chytrids increases in the water column during dinoflagellate proliferations, suggesting their opportunistic parasitic behaviour. In the laboratory, strains of four chytrid species, including the most abundant species detected by metabarcoding sequencing, have been cultured and identified by co-culture techniques with dinoflagellates. Three strains correspond to as yet undescribed species and the cultures have allowed the morphological and molecular characterisation of two of them, Dinomyces gilberthii and Paradinomyces evelyniae, which have been newly described in this thesis. In terms of geographic distribution of species, Dinomyces gilberthii is widely distributed in coastal Mediterranean habitats particularly during summer dinoflagellate blooms. Conversely, species like Paradinomyces evelyniae exhibit a more limited distribution in these habitats. Investigations into the temporal dynamics of the fungal community on poorly explored niches such as biofilms in macroalgae, revealed an alternation in the abundance of fungal groups, significantly influenced by the epiphytic dinoflagellates dynamics. Dominant chytrid species in these communities, such as Dinomyces arenysensis, exhibit adaptability in their survival strategies, including trophic versatility. The findings demonstrate that chytrids play a significant role in the structuring of planktonic and benthic microbial communities in the coastal ecosystems.
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FERNÁNDEZ VALERO, Alan denís. Delivering insights into diversity and ecology of marine chytrids. [consulta: 3 de desembre de 2025]. [Disponible a: https://hdl.handle.net/2445/211665]