Population dynamics, interactions and evolution of marine microbes using genomic approaches

• Main Author: Latorre, Fran
• Other Authors: Logares, Ramiro, Jaillon, Olivier, Ministerio de Ciencia e Innovación (España)
• Format: Doctoral or Postdoctoral Thesis
• Language: English
• Published: Universidad Politécnica de Cataluña 2023
• Subjects: Population dynamics; Evolution; Interactions; Marine microbes; Protists; High-throughput sequencing; Single-cell Genomics; Marine ecology; Metagenomics; Marine environment; Conserve and sustainably use the oceans; seas and marine resources for sustainable development; Sola; North Atlantic
• Online Access: http://hdl.handle.net/10261/336763

Memoria de tesis doctoral presentada por Francisco Latorre Pérez para obtener el título de Doctor en Ciencias del Mar por la Universitat Politècnica de Catalunya (UPC), realizada bajo la dirección del Dr. Ramiro Logares Haurie del Institut de Ciències del Mar (ICM-CSIC) y del Dr. Olivier Jaillon.-- 222 pages [EN] There is a myriad of microorganisms on Earth contributing to global biogeochemical cycles. In the surface ocean, the smallest microbes (picoplankton) are responsible for an important fraction of the total atmospheric carbon and nitrogen fixation. The ocean picoplankton encompasses both prokaryotes (bacteria and archaea) and tiny unicellular eukaryotes (protists). Despite their overall importance for the functioning of the biosphere, many questions remain unanswered on their biogeography, population dynamics, interactions, and evolution. Answering these questions is essential in the context of global change, as alterations of the ocean microbiome could impact the function of multiple ecosystems. In this thesis, we aim at reducing the knowledge gap on the above topics through the application of High-Throughput Sequencing (HTS) and genomic approaches, using data collected during the circumglobal Tara Oceans and Malaspina-2010 expeditions, as well as at the Gulf of Maine (North Atlantic), and two Northwestern Mediterranean coastal microbial observatories (BBMO and SOLA stations). [.] [ES] Existen un sinfín de microorganismos que contribuyen a los ciclos biogeoquímicos globales. En la superficie oceánica, los microbios más pequeños (picoplancton) son responsables de fijar una gran parte del total de carbono y nitrógeno terrestre. El picoplancton agrupa tanto a procariotas (bacterias y arqueas) como a pequeños eucariotas unicelulares (protistas). A pesar de su importancia en el funcionamiento de la biosfera, existen aún muchas preguntas sin respuesta relacionadas con su biogeografía, dinámica poblacional, interacciones y evolución. Responder dichas preguntas es esencial en el contexto del cambio ...