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Functional redundancy of marine bacteria in biogeochemical cycles. Corazon De Maria 8 Madrid. Research Organisations. Sito web. Contatto amministrativo. I tradizionali studi biogeochimici hanno effettuato colture e investigato su microorganismi lontano dal loro ambiente. I ricercatori hanno cercato di capire se i taxa di microorganismi fossero unici o se svolgessero un ruolo simile in un ecosistema. La somiglianza di ruolo viene denominata ridondanza.
Per analizzare la struttura dei batteri sono stati impiegati strumenti analitici d'avanguardia, come la metagenomica e il pirosequenziamento. Poi gli scienziati hanno indagato se tali variazioni incidessero sui cicli biogeochimici. Inoltre, hanno indicato il livello di ridondanza in questo ecosistema costiero. I ricercatori hanno rilevato correlazioni positive di un gran numero di taxa batterici con la temperatura, la concentrazione di nutrienti e il mescolamento della colonna d'acqua, ottenendo in tal modo indizi riguardo al ruolo dei taxi microbici nell'ecosistema.
Stato Progetto concluso. Data di avvio 1 Settembre Data di completamento 31 Agosto Obiettivo Microorganisms drive the biogeochemical cycles on Earth. New approaches such as metagenomics or functional genomics have revolutionized our ability to link microbial ecology to biogeochemical processes, expanding our knowledge about the genes involved in key biogechemical processes, the microorganisms imediating them, and the distribution and redundancy of functions in the environment.
A central but seldom addressed question is whether different bacterial taxa are unique or redundant in their functions in the environment. This has important implications for the modeling of biogeochemical cycles. The objective of this project is to identify functional groups of bacteria and analyse their levels of redundancy in a marine long-term ecological station which has been monthly sampled for physical, chemical, and biological variables since We will incorporate molecular analyses during 3 years and make use of cutting-edge tools such as metagenomics and pyrosequencing to analyze the structure of functional bacterial groups.
We will test whether the diversity of functional groups of bacteria change at a seasonal scale, whether these changes are related to environmental or biological parameters, and in turn, whether they affect the biogeochemical cycling. As a result, we expect to verify whether some ecosystem processes are a common metabolic strategy among different bacterial phylotypes and identify key bacterial populations involved in biogeochemical cycling in this coastal marine site.
Scopri altri articoli nello stesso settore di applicazione. Recent advances in sequencing technologies have drastically improved our ability to study the diversity of uncultured microorganisms and their participation in biogeochemical processes through the analysis of their genes. This central question in microbial ecology, how unique or redundant bacteria are for ecosystem functioning, was addressed through a time-series study of 3.
The project had 3 objectives that were successfully achieved as detailed below. These results suggest that a large fraction of bacterial taxa are highly predictable from environmental conditions and show low levels of redundancy in this coastal ecosystem.
Objective 2: Explore the relationship between changes in phylogenetic and functional genetic diversity and changes in ocreanographic physical, chemical and biological parameters, in order to explore their predictability in the system. A large number of bacterial taxa were positively correlated with temperature, nutrient concentrations or the strength of water column mixing, providing hints on their ecological niches.
Bacterioplankton functional performance was also approached for 1. No direct relationship was found between phylogenetic and functional diversity, likely due to the fact that only a few species are able to grow on BIOLOG plates. However, strong seasonal patterns in the number of substrates used were identified at the deepest station E3, while lack of seasonality at the shallowest station E1 was probably linked to sustained input of organic matter favouring generalist bacterial assemblages.
Objective 3: Analyze the expression of a set of selected functional genes of interest at different times of the year in order verify whether some ecosystem processes are a common metabolic strategy among different bacterial phylotypes Rather than the original plan of combining metagenomics and qPCR gene expression analysis, a more ambitious, amplification-free analysis of bacterial communities functioning was finally performed by studying functional gene transcripts i.
A total of 8 metatranscriptomes were successfully isolated, generating over 3. Although the change in methodology has been challenging, bioinformatics analyses are virtually completed. Deciphering to what extent specific functional genes are expressed by distinct bacterial taxa over the seasons will provide important insights into the overall functional redundancy of bacterial communities at this coastal site.
Besides advancing the rarely addressed topic of functional redundancy, its results will be highly relevant for predicting marine ecosystems response to global warming. For more information, please contact Dr. Risultati finali Risultati finali non disponibili.
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In particular she has been working on the estimation of the carbon, water and energy balance of terrestrial ecosystems using aerodynamic techniques. Her research interests focus on the carbon cycle of terrestrial ecosystems and on its relation with global change. In this framework she is currently working on the interplay between climate and ecosystem responses, in order to investigate the presence of a feedback between variability of key meteorological drivers and ecosystem adaptation to climate. Barbara graduated in Environmnet al Engineering with a master thesis on the bedforms of rivers with varying width and obtained a PhD in Hydrodynamics and Environmental Modelling in at the University of Padova, with a thesis on the turbulent exchanges at the vegetation-atmosphere interface.