Simone Pennafirme

Universidade Federal Fluminense

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Mírian Araújo Carlos Crapez

Universidade Federal Fluminense

Alessandra Silveira Machado

Universidade Federal do Rio de Janeiro

Alessandra Cury Machado

Universidade Federal do Rio de Janeiro

Abı́lio Soares-Gomes

Universidade Federal Fluminense

Ricardo Tadeu Lopes

Universidade Federal do Rio de Janeiro

Inayá Lima

Universidade Federal do Rio de Janeiro

Jürgen Schnellrath

Centro de Tecnologia Mineral

Hélisson Nascimento dos Santos

Universidade Federal do Rio de Janeiro

José Augusto Pires Bitencourt

Vale Technological Institute

Carlos A. Pérez

Brazilian Center for Research in Energy and Materials

Cooperative Institutions

Universidade Federal do Rio de Janeiro

Universidade Federal Fluminense

Centro de Tecnologia Mineral

Universidade do Estado do Rio de Janeiro

Nuclear Engineering Institute

Fundação Oswaldo Cruz

Centro de Desenvolvimento da Tecnologia Nuclear

Brazilian Agricultural Research Corporation

Johannes Gutenberg University Mainz

Vale Technological Institute

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Unveiling the role of bioturbation on bacterial activity in metal-contaminated sediments

The Science of The Total Environment (2020)

Simone Pennafirme Alessandra Cury Machado Alessandra Silveira Machado Carlos A. Pérez Daniella Cristina Rodrigues Pereira

Bioturbation

TRACER

Microbial Metabolism

10.1016/j.scitotenv.2020.140988

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Citations (4)

Microstructure and mineral composition of Holocene stromatolites from Lagoa Vermelha, a hypersaline lagoon in Brazil: Insights into laminae genesis

Journal of Sedimentary Research (2020)

Carolina N. Keim Hélisson Nascimento dos Santos Carolina Souza Santiago Simone Pennafirme Reiner Neumann

ABSTRACT Stromatolites are domes, columns, or nearly flat crusts of laminated sedimentary rocks, usually consisting of Ca-Mg carbonates. Stromatolites result from lithification of microbial mats, which are benthic microbial ecosystems where microorganisms arrange themselves in layers according to their physiology. Despite a century of research, the hypothesis of stromatolite genesis by lithification of microbial mats remains controversial, and a convincing explanation for how stromatolites arise from microbial mats is still lacking. In this work, we analyze in detail a stromatolite from Lagoa Vermelha, a coastal hypersaline lagoon in Rio de Janeiro State, Brazil. The stromatolite presents a laminated core and thrombolitic regions at the periphery. Both thrombolitic and laminated facies consist of fine-grained authigenic minerals with minor contributions of bioclasts and quartz grains. X-ray diffraction shows aragonite, high-magnesium calcite (HMC) containing about 17% MgCO3, a very-high-Mg calcite (VHMC) containing 29–46% MgCO3, and small amounts of quartz and pyrite. Scanning electron microscopy of polished samples coupled to energy-dispersive X-ray analysis (EDS) showed that each lamina was composed of 1–4 distinct mineral phases embedded within each other, indicating sequential steps of precipitation of Ca-Mg carbonates under distinct biogeochemical conditions. The coexistence of different phases in a single lamina suggests that several processes contribute to mineral deposition as the incipient stromatolite laminae are left behind by microorganisms from the lower layers of the microbial mat when they grow and/or move upwards.

Stromatolite

Lithification

Microbial mat

Authigenic

10.2110/jsr.2020.40

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Citations (9)

Population dynamics and secondary production of a key benthic tanaidacean, Monokalliapseudes schubarti (Mañé-Garzón, 1949) (Tanaidacea, Kalliapseudidae), from a tropical coastal lagoon in southeastern Brazil

Crustaceana (2017)

Simone Pennafirme Abı́lio Soares-Gomes

Estimates of population dynamics and secondary production are important to understand the role of species in ecosystems and the mechanisms that drive life-history trade-offs, contributing to system preservation and monitoring. Population dynamics (growth rate, instantaneous mortality rates and longevity) and secondary production (biomass, production and P/B ratio) of the key marine benthic species Monokalliapseudes schubarti (Mañé-Garzón, 1949) were investigated monthly in a tropical coastal lagoon over 18 months and compared with data from other subtropical and temperate populations. A growth curve was estimated by fitting the Von Bertalanffy growth model. M. schubarti showed latitudinal variation in growth parameters. In tropical areas, M. schubarti generated consecutive cohorts and the growth curve parameters were: , , . A smaller asymptotic length was found for tropical and subtropical areas compared with data from temperate areas, and a lower growth rate was found at the tropical site. The annual mortality rate for the finite population was 0.999 year −1 . Longevity, estimated at 10 months, was lower at the tropical site. The secondary production rate of M. schubarti at the tropical coastal lagoon was 10.60 g AFDW m −2 year −1 , with a P/B ratio = 5.44. Brief longevity, a high P/B ratio, and high mortality may indicate M. schubarti as an opportunistic species in tropical areas.

Tropical marine climate

10.1163/15685403-00003704

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Citations (4)

Potential application of Pseudomonas stutzeri W228 for removal of copper and lead from marine environments

PLoS ONE (2020)

Carolina Coelho da Costa Waite Guilherme Oliveira Andrade da Silva José Augusto Pires Bitencourt Luciana Pereira Torres Chequer Simone Pennafirme

High concentrations of metals in the environment alter bacterial diversity, selecting resistant and tolerant species. The study evaluated the selection of a potential bacterial strain from Sepetiba Bay-Rio de Janeiro, Brazil marine sediments to remove Cu and Pb. The bacterial strain isolated from the sediments was used in three different bioassays: (1) Cu at concentrations of 0 (control), 6 and 50 μg.mL-1; (2) Pb at concentrations of 0 (control), 6 and 50 μg.mL-1; (3) Cu + Pb in concentrations of 3 μg.mL-1 Cu + 3 μg.mL-1 Pb (6 μg.mL-1) and 25 μg.mL-1 Cu + 25 μg.mL-1 Pb (50 μg.mL-1). The number of cells and the enzymatic activities of dehydrogenases and esterases were quantified. Results of taxonomic identification indicated the selection of the Pseudomonas stutzeri W228 strain, showing a greater degree of similarity (±73%) with the database used. There was no significant variation in the number of cells, 108 cells.mL-1, which represents a high biomass production in the presence of stressors. However, we observed a reduction in dehydrogenase activity at all tested concentrations of Cu, Pb and Cu + Pb. The activity of esterase increased, indicating a higher energy demand to complete the bacterial life cycle. The study showed significant results for the absorption of Pb by the extracellular polymeric substances (EPS) and the efflux of Cu. The capacity of Pb absorption by EPS can be considered a resistance mechanism, as well as the efflux of Cu, so that the available EPS sites could be occupied by the most toxic ions demonstrating that Pseudomonas stutzeri is resistant to Pb and Cu.

Pseudomonas stutzeri

Efflux

Strain (injury)

10.1371/journal.pone.0240486

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Citations (13)

Population dynamics and reproductive biology of the sandhopper Atlantorchestoidea brasiliensis (Amphipoda: Talitridae) of a sandy beach in Southwestern Atlantic Coast

Journal of Natural History (2022)

Simone Pennafirme Abı́lio Soares-Gomes

Biodiversity losses can alter ecosystem functioning. In this context, sandy beach macrobenthic species are highly vulnerable due to anthropogenic impacts and global changes. Evaluating and monitoring life history-based biological traits is a key goal for ecologists to investigate biodiversity and ecosystem functioning changes. Due to environmental conditions, however, life-history traits may vary among regions, even for similar taxa. The South Atlantic Coast is highly under-sampled compared with North Atlantic regions. Here, we investigate the life cycle, population dynamics, and reproductive biology of the key species Atlantorchestoidea brasiliensis (Dana, 1853) from a Southwestern Atlantic Coast sandy beach. We followed field time-series data of multiple life-cycle-based biological traits. The body length of A. brasiliensis varied from 1.25 to 11.86 mm. Longevity was estimated at 11.9 months for both males and females. Growth parameters were estimated as L∞ = 12.9 mm, k = 2.3, t0 = −0.10 for males and L∞ = 12.3, k = 2, t0 = −0.13 for females. The population showed continuous reproduction and multiple cohorts without seasonality. The mean sex ratio was female-biased (1.71: 1). Females bear a mean of 4–6 eggs per marsupium, with egg volume between 0.0472 and 0.0501 mm3. Female maturation was estimated at age 3.53 months, with L50% = 7.0 mm. Biological trait evaluations of A. brasiliensis were similar to those found for amphipods in South America and differed from those of similar taxa found in North Atlantic. Monitoring life history based-biological traits is essential to make management decisions, especially in environmental protection areas with vulnerable species whose recovery is challenging, to maintain the biodiversity and ecosystem functioning.

Life History Theory

Population biology

10.1080/00222933.2022.2101957

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Citations (3)

Monitoring bioturbation by a small marine polychaete using microcomputed tomography

Micron (2019)

Simone Pennafirme Alessandra Silveira Machado Alessandra Cury Machado Ricardo Tadeu Lopes Inayá Corrêa Barbosa Lima

Bioturbation

Ecosystem engineer

Marine ecosystem

10.1016/j.micron.2019.03.004

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Citations (10)