Δρ. Αλεξάνδρα Μεζίτη

Δρ. Αλεξάνδρα Μεζίτη

Founder of Smallomics

  • Address Info:
    Ιπποθοντίδων 34 & Αλκμήνης 26, 11854, Αθήνα, Ελλάδα
  • Specialties:
    PCR, Clone Libraries, FISH, ARISA, Multivariate Statistics, Phylogenetic Methods
  • Education:
    PhD, Marine Microbiology


PCR 100%


2007 – 2012 : Univercity of Thessaly
PhD, Marine Microbiology

2005-2007 : Univercity of Bremen
M.S.c., Marine Microbiology

2000-2004 : National & Kapodistrian Univercity of Athens
B.S.c., Biology



2007-2012: University of Thessaly, PhD in marine microbiology

2005-2007: University of Bremen, Max Planck Institute for Marine Microbiology, M.Sc. studies in Marine Microbiology (International Max Planck Graduate School for Marine Microbiology, MARMIC; Bremen).

2000-2004: University of Athens, B.Sc. Degree in Biology,

Scientific interests

Aquatic microbial ecology/ Gut symbiosis/ Monitoring of microbial diversity across time and space

Professional experience-Practical training projects

2016- :Coca-Cola Hellenic B.C.. Water microbial communities analysis, using molecular methods.

2016-2018: Research scientist/Consulting services, Analysis of data from Lake Lanier and Gulf of Mexico. Georgia Institute of Technology (Environmental genomics lab, Atlanta, USA. Assistant Professor Kostas Konstantinidis).

2015: Post-doctoral researcher, “The use of processed animal proteins in aquafeeds for gilthead seabream (Sparus aurata).” Department of Ichthyology and aquatic environment, University of Thessaly, Volos Greece. (Chief scientist Assistant Professor Ioannis Karapanagiotidis).

2015: Short-term scholar, ‘Spatial and temporal differences in genomic content of freshwater bacterial communities as an effect of anthropogenic pollution.’, GeorgiaTech. Environmental genomics lab, Atlanta, USA. (Supervisor Assistant Professor Kostas Konstantinidis)

2014-2015: Post-doctoral researcher, “Τhe relative role of niche and neutral mechanisms in controlling phytoplankton genetic and morphological diversity – “ECOGENE””, University of the Aegean, Mytilini, Greece

2014: Short-term scholar, ‘Spatial and temporal differences in genomic content of freshwater bacterial communities as an effect of anthropogenic pollution.’, GeorgiaTech. Environmental genomics lab, Atlanta, USA. (Supervisor Assistant Professor Kostas Konstantinidis)

2013: Prokaryotic and Protistan artificial community mixing: testing the environmental effect on grazing, FP7ASSEMBLE Grant Agreement

2012-2014: Post-doctoral researcher, ‘Estimation of the ecological state of the Gulf of Igoumenitsa (Greece) by combining conventional and contemporary methods.’ (NSRF 2007-2013, European Union, European regional development fund (ERDF), P.N.348097), University of Ioannina, Greece.

2012: Next-Generation Sequencing technologies and Informatics tools for studying Marine Biodiversity and Adaptation, HCMR, Heraclion, Greece

2012: Computational Microbial Ecology workshop, Detroit, USA.

2011: Prokaryotic artificial community mixing: testing the “Everything is Everywhere” hypothesis in the Mediterranean Sea, Assemble, Panmix project.

2010: E & ΙΑ Workshop “An Introduction to R and FLR for Quantitative Fisheries Analysis”, European Commission, Joint Research Centre (JRC), Athens, Greece

2006: Metagenomics workshop, MPI for Marine Microbiology, Bremen, Germany

2005: Basic ARB workshop, MPI for Marine Microbiology, Bremen, Germany

2004: Molecular Microbial Ecology Course, Alpine Biology Centre at Piora, University of Zurich, Switzerland.


Tsementzi, D., Rodriguez-R, L.M., Ruiz-Perez, C.A., Meziti, A., Hatt, J., Konstantinidis, K. (2019), Ecogenomic characterization of widespread, closely-related SAR11 clades of the freshwater genus “Candidatus Fonsibacter” and proposal of Ca. Fonsibacter lacus sp. nov.. Systematic and Applied Microbiology, accepted.

Parlapani, F.F., Boziaris, I.S., Meziti, A, Michailidou S, Haroutounian SA, Argiriou A, Karapanagiotidis, I.T. (2019), Microbiological status based on 454-pyrosequencing and volatilome analysis of gilthead seabream (Sparus aurata) fed on diets with hydrolyzed feather meal and poultry by-product meal as fishmeal replacers, European food research and Technology, (in press) https://doi.org/10.1007/s00217-019-03270-8.

Meziti, A., Tsementzi, D., Rodriguez, L.M., Hatt, J., Karayanni, H., Kormas K.A. Konstantinidis, K. (2019), Quantifying the changes in genetic diversity within sequence-discrete bacterial populations across a spatial and temporal riverine gradient, ISME journal, 13(3): 767-779.

Nikouli, E., Meziti, A., Mente, E., Antonopoulou, E., Kormas, K. (2018), Core gut bacterial communities in farmed populations of sea bream (Sparus aurata) and sea bass (Dicentrarchus labrax), Microorganisms, 6(3), 92.

Kokkinos, P., Karayanni, H., Meziti, A., Feidaki, R., Paparrodopoulos, S., Vantarakis, A. (2018), Assessment of the Virological Quality of Marine and Running Surface Waters in NW Greece: A Case Study, Food and Environmental Virology, 10:316-326, https://doi.org/10.1007/s12560-018-9344-6

Karayanni, H., Meziti, A., Spatharis, S., Genitsaris, S., Courties, C., Kormas, K.A. (2017), Changes in Microbial (Bacteria and Archaea) plankton community structure after artificial dispersal in grazer-free microcosms, Microorganisms, 5(2), 31.

Meziti, A., Tsementzi, D., Kormas, K., Karayanni, H., Konstantinidis, K. (2016), Anthropogenic effects on bacterial diversity and function along a river-to-estuary gradient in Northwest Greece revealed by metagenomics. Environmental Microbiology (In press).

Kormas, K. Ar., Meziti A., Papadimitriou Th, (2015), Microbiological confinement of two adjacent water wells in Lake Karla basin, Greece. Water (7:5272-5283).

Meziti, A.Kormas, K.Ar., Moustaka-Gouni, M., Karayanni, H. (2015), Spatially uniform but temporally variable bacterioplankton on a semi-enclosed coastal area. Systematic and Applied Microbiology, 38:358-367.

Kormas, K. A., Meziti, A., Mente, E. and Frentzos, A. (2014), Dietary differences are reflected on the gut prokaryotic community structure of wild and commercially reared sea bream (Sparus aurata). MicrobiologyOpen. doi: 10.1002/mbo3.202

Meziti A., Kormas Ar.K. (2013) Comparison of the Norway lobster (Nephrops norvegicus) gut bacterial communities using 16S rDNA clone libraries and pyrosequencing. Anaerobe, Vol.23:9-11

Vlahos N., Kormas Ar K., Pachiadaki G. M., Meziti A., Hotos N. G., Mente E. (2013) Changes of bacterioplankton apparent species richness in two ornamental fish aquaria. SpringerPlus.2(1):66

Parlapani F., Meziti A., Kormas K., Boziaris I. (2013) Indigenous and spoilage microbiota of farmed sea bream stored in ice identified by phenotypic and 16S rRNA gene analysis. Food Microbiology, 33:85-89

Meziti A., Mente E., Kormas K. (2012) Gut bacteria associated

with different diets in reared Nephrops norvegicus. Journal of Systematic and Applied Microbiology, 35:473-482

Spatharis, S., Skliris, N., Meziti, A., Kormas, K.Ar. (2012) First record of a Trichodesmium erythraeum bloom in the Mediterranean Sea. A result of climate change? Canadian Journal of fisheries and aquatic sciences, 69:1444-1455.

Meziti A., Ramette A., Mente E., Kormas K.Ar. (2010) Temporal shifts of the Norway lobster (Nephrops norvegicus) gut bacterial communities. FEMS Microbiology Ecology, 74:272-284.

Demiri A., Meziti A., Papaspyrou S., Thessalou-Legaki M., Kormas K. (2009). Abdominal setae and midgut Bacteria of the mudshrimp Pestarella tyrrhena. Central European Journal of Biology, 4(4): 558-566.

Kormas K., Meziti A., Daehlmann A., deLange G., Lykoussis V. (2008) Characterization of methanogenic and prokaryotic assemblages based on mcrA and 16S rRNA gene diversity in sediments of the Kazan mud volcano (Mediterranean Sea), Geobiology, 6(5): 450-460.

Meziti A, Kormas K, Pancucci-Papadopoulou A, Thessalou-Legaki M (2007) Bacterial phylotypes associated with the intestinal tract of the sea urchin Paracentrotus lividus and the ascidian Microcosmus sp., Russian Journal of Marine Biology, 33: 84-91.

Thesis publications

Molecular diversity and abundance of Prokaryotes from the digestive tract of Norway lobster (Nephrops norvegicus) individuals in natural and reared populations. (2012), PhD Thesis, University of Thessaly, Greece, pp.133.

Diversity and distribution of benthic Crenarchaeota in marine sediments. (2007). M.Sc. Thesis, University of Bremen, Germany, pp.45.

Prokaryotic symbiotic microorganisms in the intestinal tract of sea urchins and marine ascidians (2004). Undergraduate Thesis, University of Athens, Greece, pp.45.

Chapters in books

Kormas K., Meziti A. (2011) The role of microorganisms in the rearing of Decapoda. In Elements of feeding physiology and applied diet of fishes and crustaceans. Mente E., Negas I. (eds). Athens, Papazisis Editions, pp. 361-376 (In greek).