INSTITUTO TECNOLOGICO DE CHASCOMUS
Unidad Ejecutora - UE
congresos y reuniones científicas
Eutrophication impacts on the diversity of bacterial communities in argentine pampean shallow lakes: Implications in ecosystem services provision
LLAMES, M.E.; METZ, SEBASTIÁN; CASTRO BERMAN, M.; QUIROGA, M.V.; OTTAVIANI, R.
Simposio; Isme Unity in Diversity; 2020
International Society for Microbial Ecology (ISME)
Shallow lakes are distinctive features of the Pampa Region (Argentina) and are closely associated with the regional economy, through its exploitation as tourism, recreational and fishing resources. These shallow systems provide fundamental services for communities developing in these watersheds, both directly, through the provision of food and water, as indirectly through climate control, mitigation of floods and droughts, and the cycling of organic matter, among others. The pristine state of these systems was a clear-water state, with abundant aquatic vegetation. Currently, the region is experiencing changes in climate and land use and many of them have switched to a turbid hypertrophic state due to increased nutrients loads.Bacteria are the most diverse and functionally important organisms on Earth. They carry out the bulk of decomposition and catalyze important transformations in the nutrient cycles influencing the functioning of virtually all ecosystems. As human activities reshape bacterial communities worldwide, from global climate change to antibiotics in the human body, it is crucial to understand how bacterial diversity can be preserved, and how environmental change might affect this community.We analyzed the underlying drivers structuring bacterial communities in 52 shallow lakes to assess the relevance of environmental factors acting locally, at the watershed level and at regional level on the bacterial metacommunity structure and composition. Our results evidenced a hierarchy in the environmental sorting wherein dominant phyla are regionally selected from the metacommunity pool, while variations in land use within the catchment area, as well as trophic state further select taxa from these main players. We found a prevailing dominance of Actinobacteria and Proteobacteria in these lakes, with land use and local abiotic conditions promoting shifts at finer scale taxonomic resolution.