Disentangling the lifestyle of bacterial communities in tropical soda lakes

Autor(es)

Cotta, Simone R. ; Pellegrinetti, Thierry A. ; Andreote, Ana Paula D. ; Costa, Juliana S. ; Sarmento, Hugo ; Fiore, Marli F.

• Tipo de documento: Artigo Científico
• Fonte: SCIENTIFIC REPORTS; v. 12, n. 1, p. 10-pg., 2022-05-13.

Resumo

Microbial lifestyles may reveal niche-specific signatures and can contribute to detecting the effects of abiotic fluctuations on biogeochemical cycles. Microorganisms make a tradeoff between optimizing nutrient uptake, improving biomass yield, and overcoming environmental changes according to environmental hostility. Soda lakes are natural environments rich in carbonate and bicarbonate water, resulting in elevated pH and salinities that frequently approach saturation. We hypothesized that during the dry period (elevated pH and salinity), microorganisms try to overcome this harshness by allocating energy to the cellular maintenance process. As these environmental conditions improve during the wet period, microorganisms will begin to invest in nutrient uptake. To test this hypothesis, we evaluated four soda lakes in two different seasons by applying metagenomics combined with flow cytometry (estimate heterotrophic bacterial biomass). The natural occurrence of cyanobacterial blooms in some lakes is the main driver of carbon. These primary producers provide organic carbon that supports heterotrophic bacterial growth and, consequently, a high biomass yield. Under harsh conditions (dry season), cyanobacteria invest in nutrient uptake mechanisms, whereas heterotrophic bacteria allocate energy to survive at the expense of biomass yield. Lakes without cyanobacteria blooms invest in nutrient uptake independent of environmental hostility. This study clarifies the microbial tradeoffs in hostile environments and the impact of this choice on carbon and energy flux in tropical alkaline lakes. (AU)

• Processo FAPESP: 18/24049-2 - Biogeografia de comunidades microbianas em lagoas salino-alcalinas do pantanal brasileiro
• Beneficiário: Simone Raposo Cotta
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 16/14227-5 - Mudanças climáticas e impactos ambientais em áreas alagadas (wetlands) do Pantanal (Brasil): quantificação, fatores de controle e previsão em longo prazo
• Beneficiário: Adolpho José Melfi
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Temático
• Processo FAPESP: 17/12644-0 - Comunidades microbianas e genes funcionais envolvidos na ciclagem de nutrientes em lagoas do Pantanal da Nhecolândia (MS)
• Beneficiário: Thierry Alexandre Pellegrinetti
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto