Maria Alcaman

Maria Alcaman
Center for Climate and Resilience Research | CR2 · Universidad de Concepcion

Doctor in Biological Science ms. Molecular Genetics and Microbiology

About

18
Publications
2,491
Reads
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228
Citations
Introduction
My research focuses on microbial ecology and biogeochemical cycles of terrestrial hydrothermal systems, as well as temperate coastal oceans, and Antarctic polar environments. In addition to skills in Genomics, Bioinformatics, Microbiology.
Additional affiliations
January 2018 - present
Center for Climate and Resilience Research
Position
  • PostDoc Position
March 2017 - March 2020
University of Concepción
Position
  • PostDoc Position
January 2006 - May 2010
University of Concepción
Position
  • Technician
Education
March 2011 - December 2012
Pontificia Universidad Católica de Chile
Field of study
  • Microbial Ecology in extreme ecosystems
March 2011 - December 2016
Pontificia Universidad Católica de Chile
Field of study
  • Microbial Ecology in extreme ecosystems
March 2002 - December 2006
University of Concepción
Field of study
  • Photobiology of cyanobacteria in oxygen minimum zones

Publications

Publications (18)
Article
Full-text available
Cyanobacteria from Subsection V (Stigonematales) are important components of microbial mats in non-acidic terrestrial hot springs. Despite their diazotrophic nature (N2 fixers), their impact on the nitrogen cycle in such extreme ecosystems remains unknown. Here, we surveyed the identity and activity of diazotrophic cyanobacteria in the neutral hot...
Article
Cyanobacteria are widely distributed primary producers with significant implications for the global biogeochemical cycles of carbon and nitrogen. Diazotrophic cyanobacteria of subsection V (Order Stigonematales) are particularly ubiquitous in photoautotrophic microbial mats of hot springs. A stigonematal cyanobacterium isolated from the Porcelana h...
Article
Full-text available
Phytoplankton biomass during the austral summer is influenced by freezing and melting cycles as well as oceanographic processes that enable nutrient redistribution in the West Antarctic Peninsula (WAP). Microbial functional capabilities, metagenomic and metatranscriptomic activities as well as inorganic 13C- and 15N-assimilation rates were studied...
Article
In the Porcelana Hot Spring (Northern Patagonia), true-branching cyanobacteria are the dominant primary producers in microbial mats, and they are mainly responsible for carbon and nitrogen fixation. However, little is known about their metabolic and genomic adaptations at high temperatures. Therefore, in this study, a total of 81 Fischerella therma...
Article
Full-text available
Composition, carbon and nitrogen uptake, and gene transcription of microbial mat communities in Porcelana neutral hot spring (Northern Chilean Patagonia) were analyzed using metagenomics, metatranscriptomics and isotopically labeled carbon (H13CO3) and nitrogen (15NH4Cl and K15NO3) assimilation rates. The microbial mat community included 31 phyla,...
Article
Full-text available
Although crucial for the addition of new nitrogen in marine ecosystems, dinitrogen (N2) fixation remains an understudied process, especially under dark conditions and in polar coastal areas, such as the West Antarctic Peninsula (WAP). New measurements of light and dark N2 fixation rates in parallel with carbon (C) fixation rates, as well as analysi...
Article
Full-text available
Marine ammonia oxidizers that oxidize ammonium to nitrite are abundant in polar waters, especially during the winter in the deeper mixed-layer of West Antarctic Peninsula (WAP) waters. However, the activity and abundance of ammonia-oxidizers during the summer in surface coastal Antarctic waters remain unclear. In this study, the ammonia-oxidation r...
Article
Full-text available
Proteorhodopsin-bearing microorganisms in the Southern Ocean have been overlooked since their discovery in 2000. The present study identify taxonomy and quantify the relative abundance of proteorhodopsin-bearing bacteria and proteorhodopsin gene transcription in the West Antarctic Peninsula’s coastal waters.
Article
Full-text available
Current warming in the Western Antarctic Peninsula (WAP) has multiple effects on the marine ecosystem, modifying the trophic web and the nutrient regime. In this study, the effect of decreased surface salinity on the marine microbial community as a consequence of freshening from nearby glaciers was investigated in Chile Bay, Greenwich Island, WAP....
Article
Full-text available
The true-branching cyanobacterium Fischerella thermalis (also known as Mastigocladus laminosus) is widely distributed in hot springs around the world. Morphologically, it has been described as early as 1837. However, its taxonomic placement remains controversial. F. thermalis belongs to the same genus as mesophilic Fischerella species but forms a m...
Data
Process and pathways analyzed with principal genes associated and encoding protein. All this was used as diagnostic for phototrophy, autotrophy, and nitrogen cycle transformations.
Data
Results of high throughput sequencing: raw reads, quality reads, percentage of reads corresponding to ribosomal RNA, non-ribosomal genes, non-redundant (NR) hits and percentage of the latter that could be taxonomically assigned. Numbers of sequences are shown in millions.
Data
Total percentage of Bacteria and Archaea phyla present in the entire temperature gradient of Porcelana hot spring at noon and night (N) periods.
Article
Full-text available
The high availability of electron donors occurring in coastal upwelling ecosystems with marked oxyclines favours chemoautotrophy, in turn leading to high N2O and CH4 cycling associated with aerobic NH4+ (AAO) and CH4 oxidation (AMO). This is the case of the highly productive coastal upwelling area off central Chile (36° S), where we evaluated the i...
Article
Full-text available
Tracer experiments (15N and 13C) were carried out off the Peruvian upwelling system in order to evaluate the potential role of regenerated nitrogen in sustaining biological productivity in surface waters (0–15 m depth range).Rates of daily carbon uptake in surface waters showed values ranging between 6 and 200 mg C m−3 d−1. Maximum integrated rates...
Article
Full-text available
Coastal upwelling ecosystems with marked oxyclines (redoxclines) present high availability of electron donors that favour chemoautotrophy, leading in turn to high N2O and CH4 cycling associated with aerobic NH4+ (AAO) and CH4 oxidation (AMO). This is the case of the highly productive coastal upwelling area off Central Chile (36° S), where we evalua...
Article
Full-text available
Coastal upwelling ecosystems with marked oxyclines (redoxclines) present high availability of electron donors that favour chemoautotrophy, leading in turn to high N<sub>2</sub>O and CH<sub>4</sub> cycling associated with aerobic NH<sub>4</sub><sup>+</sup> (AAO) and CH<sub>4</sub> oxidation (AMO). This is the case of the highly productive coastal up...

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Projects

Projects (2)
Project
Determine the diversity, dynamics, and function of the snow microbial community and their biological interactions with those from closed environments such as the air and the surface ocean in the WAP, to reveal the biogeochemical role of their actives metabolic pathways related to inorganic carbon, nitrogen, and atmospheric organic pollutants.
Project
Determine how the nitrifying community composition, activity and nitrification rates, in terms of nitrate production and dark CO2 fixatio, as well as N2O production, are affected by temperature (ice-melt), salinity and low pH in surface and subsurface waters of Chile Bay, Antarctic.