A Mosaic of Geothermal and Marine Features Shapes Microbial Community Structure on Deception Island Volcano, Antarctica

Autor(es)

Bendia, Amanda G. ^[1] ; Signori, Camila N. ^[1] ; Franco, Diego C. ^[1] ; Duarte, Rubens T. D. ^[1] ; Bohannan, Brendan J. M. ^[2] ; Pellizari, Vivian H. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Oceanog, Dept Oceanog Biol, Sao Paulo - Brazil

^[2] Univ Oregon, Dept Biol, Inst Ecol & Evolut, Eugene, OR 97403 - USA

• Tipo de documento: Artigo Científico
• Fonte: FRONTIERS IN MICROBIOLOGY; v. 9, MAY 7 2018.
• Citações Web of Science: 4

Resumo

Active volcanoes in Antarctica contrast with their predominantly cold surroundings, resulting in environmental conditions capable of selecting for versatile and extremely diverse microbial communities. This is especially true on Deception Island, where geothermal, marine, and polar environments combine to create an extraordinary range of environmental conditions. Our main goal in this study was to understand how microbial community structure is shaped by gradients of temperature, salinity, and geochemistry in polar marine volcanoes. Thereby, we collected surface sediment samples associated with fumaroles and glaciers at two sites on Deception, with temperatures ranging from 0 to 98 degrees C. Sequencing of the 16S rRNA gene was performed to assess the composition and diversity of Bacteria and Archaea. Our results revealed that Deception harbors a combination of taxonomic groups commonly found both in cold and geothermal environments of continental Antarctica, and also groups normally identified at deep and shallow-sea hydrothermal vents, such as hyperthermophilic archaea. We observed a clear separation in microbial community structure across environmental gradients, suggesting that microbial community structure is strongly niche driven on Deception. Bacterial community structure was significantly associated with temperature, pH, salinity, and chemical composition; in contrast, archaeal community structure was strongly associated only with temperature. Our work suggests that Deception represents a peculiar ``open-air{''} laboratory to elucidate central questions regarding molecular adaptability, microbial evolution, and biogeography of extremophiles in polar regions. (AU)

• Processo FAPESP: 12/11037-0 - Indicadores microbianos de mudanças climáticas em amostras de ambientes extremos da Antártica marítima
• Beneficiário: Rubens Tadeu Delgado Duarte
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 12/23241-0 - Metagenoma de comunidades microbianas de ambientes com atividade geotermal na Ilha Vulcânica Deception, Antártica
• Beneficiário: Amanda Gonçalves Bendia
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 16/16183-5 - A contribuição da quimiossíntese no ciclo do carbono em zonas abissais da elevação do Rio Grande (Oceano Atlântico Sul ocidental)
• Beneficiário: Camila Negrão Signori
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado