Caracterização da microbiota marinha sob influência do degelo glacial na Baía do Almirantado, Antártica

Ferreira, Ivan Gonçalves de Castro

doi:10.11606/d.21.2020.tde-30012020-154852

Cited by 3 publications

(4 citation statements)

References 63 publications

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“…On the basis of the modelled air mass back trajectories results, we aim to investigate the relationships between the microbiomes from continental snow and those found in surface seawaters from different regions at the AP. For this, we selected 16S rRNA gene sequencing datasets obtained by our group from previously published studies 56,57 under the Brazilian Antarctic Program, including a total of 151 samples from surface seawaters (∼5 m to 30 m depths) collected between 2013 and 2015 (Figure 6A; Supplementary Table 1 56 . After filtration, samples were frozen at −20 o C for molecular analysis.…”

Section: Comparing Potential Sources and Central Antarctic Microbiomesmentioning

confidence: 99%

Patterns of air mass incursions from Southern Ocean play a role on microbial dispersions into West Antarctic Ice Sheet

Bendia,

Gonçalves,

Moreira

et al. 2024

Preprint

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The cryosphere microbiomes are mostly inoculated by airborne microorganisms, which can accumulate year by year over the accreted snow. The detection of sea salt, pollutants, volcanic glass and other lithogenic materials in the interior of the West Antarctic Ice Sheet (WAIS) is evidence of a continuous inflow of exogenous microparticles to that site. In this work we demonstrate, that, likewise, marine microorganisms follow same pattern and can be long-range transported through the Antarctic troposphere reaching out high latitudes. To evidence it, we constructed an excavated 2m-depth pit named “Criolab’ in the surroundings of the Brazilian Criosfera1 remote laboratory at WAIS to collect snow and firn samples for microbial diversity analysis, together with snow and airborne microparticle composition measurements. Origin of air masses reaching Criosfera 1 were inferred from air masses backward trajectories modelling. We found a discontinuous profile of microbial taxa abundances and diversity, which is likely a result of the air mass back trajectories changes that carried microorganisms from distinct Antarctic sources during an estimated period of 4 years. Our study indicates that different marine groups, such as SAR11, Idiomarina, and Nitrosopumilus, are shared between the WAIS snow and AP seawater communities, suggesting they are long-range transported over Antarctica. Considering their low and interspersed abundances, we postulate a pre- and post-depositional selection in the face of the extreme atmosphere and cryosphere conditions. Our observations have implications for the understanding of the aeolian dispersion patterns over Antarctica, indicating the importance of the marine microbiomes in seeding the interior of the continent.

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Section: Comparing Potential Sources and Central Antarctic Microbiomesmentioning

confidence: 99%

Patterns of air mass incursions from Southern Ocean play a role on microbial dispersions into West Antarctic Ice Sheet

Bendia,

Gonçalves,

Moreira

et al. 2024

Preprint

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Section: Microbial Diversity Datamentioning

confidence: 99%

“…Microbial community datasets were obtained by our group from previously published studies (Signori et al, 2018;de Ferreira, 2019) under the Brazilian Antarctic Program, and comprised a total of 105 samples from surface waters (∼5 m depth) collected in the NWAP and NWWS. Sampling strategy and sample processing are detailed in Signori et al (2018) andde Ferreira (2019). Briefly, approximately 3 L of seawater samples were filtered onto 0.22 µm-membrane Sterivex TM filters using a peristaltic pump onboard the Brazilian polar vessel Almirante Maximiano (Signori et al, 2018) or at Comandante Ferraz Brazilian Antarctic Station (King George Island, Antarctica; de Ferreira, 2019).…”

Section: Microbial Diversity Datamentioning

confidence: 99%

Climate Projections for the Southern Ocean Reveal Impacts in the Marine Microbial Communities Following Increases in Sea Surface Temperature

et al. 2021

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Anthropogenic global warming can have strong impacts on marine ecosystems, especially on climate-sensitive regions such as the Southern Ocean (SO). As key drivers of biogeochemical cycles, pelagic microbial communities are likely to respond to increases in sea surface temperature (SST). Thus, it is critical to understand how SST may change in future scenarios and how these changes will affect the composition and structure of microbial communities. By using a suite of Earth System Models participating in the Coupled Model Intercomparison Project Phase 6 (CMIP6), machine learning, and 16S rRNA sequencing data, we investigated the long-term changes as projected by CMIP6 simulations in SST throughout the twenty first century and the microbial diversity responses in the SO. Four Shared Socioeconomic Pathways (SSP1-2.6, SSP2-4.5, SSP3-7.0, and SSP5-8.5) were considered to assess the SO surface sensitivity to a warming climate. The SST changes across SSPs were ≈0.3, ≈0.7, ≈1.25, and ≈1.6oC between 2015 and 2100, respectively, and the high emissions scenarios projected a much sooner emergence of the human-induced temperature change throughout the SO. The impacts on Antarctic marine diversity of bacteria and archaea are expected to be significant and persistent by the late twenty first century, especially within the higher end of the range of future forcing pathways.

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“…A maioria dos táxons citados já foram descritos em regiões próximas ao Estreito de Gerlache (Luria et al, 2014;Signori et al, 2014;Vescovo et al, 2014;Signori et al, 2018;Ferreira, 2019;Liu et al, 2020;Ozturk et al, 2022) Entre as zonas pelágicas, apenas duas ASVs foram exclusivas da camada superficial ou epipelágica, e 77 foram exclusivas de águas profundas ou meso/batipelágicas (Figura 29).…”

Section: Microbioma Centralunclassified

Microbioma pelágico no Estreito de Gerlache (Península Antártica Ocidental) frente às mudanças climáticas globais

Gusmão¹

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oportunidade de realização do curso e estrutura disponível para realizar as análises.À minha orientadora Profa. Dra. Camila Negrão Signori, que sempre esteve disponível para me ensinar e me apoiar, que acreditou no meu valor como cientista e me deu oportunidades para meu crescimento pessoal, científico e intelectual. Ao projeto "Respostas do Ecossistema Pelágico às mudanças climáticas no OceanoAustral" (EcoPelagos) e ás operações do Programa Antártico Brasileiro (OPERANTAR) pela disponibilização das amostras e pelo apoio financeiro para a realização desta pesquisa.Ao Prof. Dr. Eduardo Secchi, coordenador do projeto EcoPelagos e ao Grupo de Oceanografia de Altas Latitudes (GOAL) pela disponibilização dos dados físico-químicos.Ás colegas de trabalho do Laboratório de Ecologia Microbiana (LECOM) Msc.Francielli Peres e Dra. Amanda Bendia, pela atenção, paciência, ensinamentos e apoio durante a realização desse trabalho. Ao laboratório de Oceanografia Microbiana (MicrOcean) por toda a ajuda com informações e companheirismo no café e nas risadas.Ao meu noivo e melhor amigo Carlos Bercini, que esteve ao meu lado nos momento difíceis, que corrigiu meus textos, me ajudou durante diversas etapas da pesquisa e nunca me deixou desistir dos meus sonhos. Aos meus pais, Vera e Márcio, que nunca mediram esforços para me auxiliar na permanência em São Paulo, e sempre me apoiaram à seguir o caminho científico. E aos meus pais de coração Juliana, Uwe, Lauro e Luciana que sempre estiveram com o coração aberto para me receber e vibrar pelas minhas conquistas. Aos meus amigos Gabriela, Hadassa, Loreana, João, Diogo, Gabriel e Ewerton pela alegria nos momentos de descontração, pela amizade e convivência nesses anos em São Paulo. Vocês tornaram essa passagem mais divertida. Á Kimera que é luz na minha vida e minha companheira durante toda a carreira acadêmica. Á todos os outros que não foram citados e conheci nessa caminhada, que me ajudaram a crescer de alguma forma. O presente trabalho foi realizado com apoio da Coordenação de Aperfeiçoamento de Pessoal de Nível Superior -Brasil (CAPES) -Código de Financiamento 001."O papel dos infinitamente pequenos na natureza é infinitamente grande".

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Caracterização da microbiota marinha sob influência do degelo glacial na Baía do Almirantado, Antártica

Cited by 3 publications

References 63 publications

Patterns of air mass incursions from Southern Ocean play a role on microbial dispersions into West Antarctic Ice Sheet

Patterns of air mass incursions from Southern Ocean play a role on microbial dispersions into West Antarctic Ice Sheet

Climate Projections for the Southern Ocean Reveal Impacts in the Marine Microbial Communities Following Increases in Sea Surface Temperature

Microbioma pelágico no Estreito de Gerlache (Península Antártica Ocidental) frente às mudanças climáticas globais

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