Start Research
Contact Us

Laura Alonso Sáez

(freezing at -40ºC!)

Postdoctoral researcher 'Juan de la Cierva'
Phone: +34 985 309 790

Research interests

My field of research is the Aquatic Microbial Ecology. Basically, I am interested in the links between microbial diversity and biogeochemical processes, or in other words, I am interested in "who" is doing "what" in the world of oceanic microbes. For this purpose I have worked with single-cell techniques to identify active bacterial populations in the use of organic carbon. Part of my postdoctoral research has also focused on the diversity and metabolic activity of planktonic Archaea, working in systems as remote as the polar oceans. Since my incorporation in the IEO-Gijón, I am carrying out the project FUNDIVERSITY, focusing on the identification of functional groups of bacteria, and their levels of redundancy in coastal marine waters.
  • "Juan de la Cierva” Postdoctoral Researcher at IEO-Gijón, Spain. May 2010-today
  • Marie Curie Postdoctoral Fellow in the Ecology and Evolution Department/Limnology of Uppsala University, Sweden. May 2008-April 2010
  • VR postdoctoral Fellow in the Ecology and Evolution Department/Limnology of Uppsala University. November 2007-April 2008
  • Research Assistant at the  CEAB-CSIC, Blanes, Spain May 2007-October 2007
  • Ph.D in Marine Sciences. Institut de Ciències del Mar (CSIC)-Universitat Politecnica de Catalunya, Barcelona, Spain; September 2006.
  • Biology Degree. Universidad del Pais Vasco UPV-EHU, Spain; 2000.

  • Alonso-Sáez, L.,  Sanchez O., Gasol J.M. Bacterial uptake of low molecular weight organics in the subtropical Atlantic: Are major phylogenetic groups functionally different?. 2012. Limnol. Oceanogr. 53: 798-808
  • Alonso-Sáez, L., Waller A.S., Mende D., Bakker K., Farnelid H., Yager P., Lovejoy C., Tremblay J-E., Potvin M., Heinrich F., Estrada M., Riemann L., Bork P., Pedrós-Alió C., Bertilsson S. Role for urea in nitrification by polar marine Archaea. 2012. PNAS 44: 17989-17994
  • Moran, X.A.G., Alonso-Sáez L. Independence of bacteria on phytoplankton? Insufficient support for Fouilland & Mostajir’s (2010) suggested new concept. 2011. FEMS Microbiol. Ecol. 78: 203-205
  • Alonso-Sáez L,. Andersson A.F., Heinrich F., Bertilsson S. High archaeal diversity in Antarctic Circumpolar Deep Waters. 2011. Environ. Microbiol. Reports 3: 689-697
  • Llirós M., Alonso-Sáez L., Gich, F., Plasencia, A., Auguet, O., Casamayor, E., Borrego, C. Active bacteria and archaea cells fixing bicarbonate in the dark along the water columna of a stratified eutrophic lagoon. 2011. FEMS Microbiol. Ecol. 77: 370-384
  • Balestra C, Alonso-Sáez L, Gasol JM, Casotti R. Group-specific effects on coastal bacterioplankton of polyunsaturated aldehydes produced by diatoms. 2011. Aquat. Microb. Ecol. 63: 123-131
  • Gantner, S., Andersson A.F., Alonso-Sáez L., Bertilsson S. Novel primers for 16S rRNA-based archaeal community analyses in environmental samples. 2011. Journal of Microbiological Methods 84: 8-12
  • Alonso-Sáez, L., Galand P., Casamayor E., Pedros-Alio C., Bertilsson S. High bicarbonate assimilation in the dark by Arctic bacteria.  2010. The ISME Journal 4: 1581-1590
  • Alonso-Sáez, L., Pinhassi J., Pernthaler J., Gasol J.M. Leucine-to-carbon empirical conversión factor experiments: does bacterial community structure have an influence?. 2010. Environmental microbiology 12: 2998-2997
  • Alonso-Sáez, L., Unanue M., Latatu A., Azua I., Ayo B., Artolozaga I., Iriberri J. Changes in marine prokaryotic community induced by varying types of dissolved organic matter and subsequent grazing pressure. 2009. J. of Plankton Res. 31: 1373-1383
  • Gasol, J.M., Pinhassi J., Alonso-Sáez L., Ducklow H., Herndl G.J., Koblizek M., Labrenz M., Luo Y., Morán XAG, Reinthaler T., Simon M. Towards a better understanding of microbial carbon flux in the sea. 2009. Aquat. Microb. Ecol. 53:21-38
  • Gasol, J.M., Alonso-Sáez L., Vaqué D., Baltar F., Calleja M.L., Duarte C.M., Aristegui J. Mesopelagic prokaryotic bulk and single-cell heterotrophic activity and community composition in the Canary Islands coastal transition zone. 2009. Progress in Oceanogr. 83: 189-196
  • Simo, R., Vila-Costa, M., Alonso-Sáez L, Cardelús C, Guadayol O, Vazquez-Dominguez E, Gasol JM. Annual DMSP contribution to S and C fluxes through phytoplankton and bacterioplankton in a NW Mediterranean coastal site. 2009. Aquat. Microb. Ecol. 57:43-55
  • González, J.M., Fernández-Gómez B., Fernàndez-Guerra A, Gómez-Consarnau L., Sánchez O., Coll-Lladó M., del Campo J., Escudero L., Rodríguez-Martínez R., Alonso-Sáez L., Latasa M., Paulsen I., Nedashkovskaya O., Lekunberri I., Pinhassi J., Pedrós-Alió C. Genome analysis of the proteorhodopsin-containing marine bacterium Polaribacter sp. MED152 (Flavobacteria). 2008. PNAS 105: 8724-8729
  • Alonso-Sáez, L., Sánchez O., Gasol J.M., Balague V., Pedrós-Alió C. Winter to summer changes in the composition and single-cell activity of near-surface Arctic prokaryotes. 2008. Environ Microbiol 10: 2444-2454
  • Vila-Costa, M., Simó R., Alonso-Sáez L., Pedrós-Alió C. Number and phylogenetic affiliation of bacteria assimilating dimethylsulfoniopropionate and leucine in the ice-covered coastal Arctic Ocean. 2008. J. of Mar. Syst. 74: 957-963
  • Alonso-Sáez, L., Vázquez-Domínguez E., Cardelús C., Pinhassi J., Sala M.M., Lekunberri I., Balagué V., Maria-Costa M., Unrein F., Massana R., Simó R., Gasol, J.M. Factors controlling the seasonality of bacterial carbon use in NW mediterranean coastal waters. 2008. Ecosystems 11: 397-409
  • Alonso-Sáez, L., Gasol J.M. Seasonal variation in the incorporation of Low molecular weight-DOM between phylogenetic bacterial groups in NW Mediterranean. 2007. Appl. Env. Microbiol 73: 3528-3535
  • Garcés, E., Vila M, Reñe A, Alonso-Sáez L., Anglés S, Lugliè A, Masó M., Gasol J.M. Natural bacterioplankton assemblage structure during bloom events of Alexandrium species (Dinophyceae) in NW Mediterranean coastal waters. 2007. Aquat. Microb. Ecol. 46: 55-70
  • Unrein, F., Massana R., Alonso-Sáez L., Gasol J.M. Significant year-round impact of small mixotrophic flagellates on bacterioplankton in an oligotrophic coastal system. 2007. Limnol. Oceanogr. 52:456-469
  • Alonso-Sáez, L., Balagué V., Sa E., Sánchez O., González J.M., Pinhassi J., Massana R., Pernthlaer J., Pedrós-Alió C., Gasol, J.M. Seasonality in bacterial diversity in NW Mediterranean coastal waters: assessment through clone libraries, fingerprinting and fluorescence in situ hybridization. 2007. FEMS Microbiol. Ecol. 60: 98-112
  • Alonso-Sáez, L., Arístegui J, Pinhassi, J., Gómez-Cornasau, L., Gonzalez J.M., Vaqué, D., Agustí, S., Gasol, J.M. Bacterial assemblage structure and carbon metabolism along a productivity gradient in the North East Atlantic Ocean. 2007. Aquat. Microb. Ecol. 46: 43-53.
  • Alonso-Sáez, L., Gasol, J.M., Arístegui J, Vilas, J.C., Vaqué D., Duarte C.M., Agustí, S. Large scale variability in surface bacterial carbon demand and growth efficiency in the subtropical North East Atlantic Ocean. 2007. Limnol. Oceanogr. 52: 533-546
  • Pinhassi, J., Gómez-Consarnau L., Alonso-Sáez L, Sala M.M., Vidal M., Pedrós-Alió C., Gasol J.M. Seasonal changes in bacterioplankton nutrient limitation and their effects on bacterial community composition in the NW Mediterranean Sea. 2006. Aquat. Microb. Ecol. 44: 241-252
  • Alonso-Sáez, L., Sommaruga, R., Lefort, T., Hofer, J.S., Gasol, J.M. Sunlight radiation sensitivity of bacterioplankton from surface Mediterranean Coastal waters. 2006. Appl. Env. Microbiol. 72: 5806-5813.
  • Garneau, M., Vincent, W., Alonso-Sáez, L., Gratton, Y., Lovejoy C. Prokaryotic community structure and heterotrophic production in a river-influenced coastal Arctic ecosystem. 2006. Aquat. Microb. Ecol. 42: 27-40
  • Pinhassi, J., Simó, R., González, J.M., Vila, M., Alonso-Sáez, L., Kiene, R., Moran M.A., Pedrós-Alió, C. Dimethylsulfoniopropionate turnover linked to the composition and dynamics of the bacterioplankton assemblage during a microcosm phytoplankton bloom. 2005. Appl. Env. Microbiol. 71: 7650-7660
  • Arístegui, J., Duarte, C.M., Gasol, J.M., Alonso-Sáez, L. Active mesopelagic prokaryotes support high respiration in the subtropical northeast Atlantic Ocean. 2005. Geophysical Research Letters. vol 32. doi:10.1029/2004
  • Sommaruga, R., Hofer, J.S., Alonso-Sáez, L., Gasol J.M. Differential Sunlight Sensitivity of picophytoplankton from Surface Mediterranean Coastal Waters. 2005. Appl. Environ. Microbiol. 71: 2154-2157.


See my complete CV. PDF
Centro Oceanográfico de Gijón - Avda. Príncipe de Asturias, 70 bis - 33212 Gijón/Xixón - Spain - E-mail: - Phone: +34 985 309 780 - Fax: +34 985 326 277