Nicolas Bez


Institut : IRD



Pôles communs : Expertise


Senior scientist in fisheries science & geostatistics

Getting start in linear and applied geostatistics

Research activities

Research interests
Spatial statistics : theory, practice, software.
Trajectories : model, biologging.
Fractals : theory.

Publications : 29 Book : 1 Oral presentations : > 50

Field work
Participation to scientific surveys (plancton, demersal or pelagic trawl ; acoustic ; CUFES).

Team management

2009-2014 : deputy director of the research unit “Exploited Marine Ecosystems” (80 permanent people, 40 PhDs). Laboratories in France (Sète) and overseas (South Africa, Peru, Seychelles, La Réunion, Ivory Coast). Contracts ≈ 1 500 K€/year. Certification ISO9001.

2001-2008 : coordination of 2 Europen Union (EU) projects.
ISTAM : Improve Scientific and Technical Advices for fisheries Management. 13 partners.
CATEFA : Combining Acoustic and Trawl data to Estimate Fish Abundance. 6 partners.

1993-2015 : participation to 7 EU projects.

Implication in scientific societies

Association Française d’Halieutique (AFH)
French Fisheries Association
President (2005-2009) and Vice-President (since 2009).

Association Française de Statistique (SFdS)
Member since 2004.

Conference organization
Member of several organizing committees : AFH (6 times), ISEC2014, GeoENV, ICES …


Regional Fisheries Management Organizations (RFMO)
Participations to Working Groups of ICES, ICCAT, and IOTC.

Technical expertises
Geostatistical expert for DFO-Canada since 2009 (snow crab biomass estimation).
Geostatistical expert for FAO (octopus in Morrocco ; 2003).

Member of the Sciencitifc Committee for the Fisheries agreements between EU and Mauritania
Member of the Scientific Committee of IMROP (Mauritania)


Academic : regular teaching spatial statistics to undergraduate students ( 50 hours/years).

Research scools : research courses of one week (2-3 weeks/year).

PhDs : 10 PhD students supervised. Particiption to 8 PhD’s committees and to 8 defenses.

Trainings : Supervisor of 13 students.



Assali, C., N. Bez, and Y. Tremblay. "Raking the ocean surface: new patterns of coordinated motion in seabirds." J. Avian Biol.. 51.6 (2020).
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Rufino, M. M., N. Bez, and A. Brind'Amour. "Ability of spatial indicators to detect geographic changes (shift, shrink and split) across biomass levels and sample sizes." Ecol. Indic.. 115 (2020): 106393.
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Rufino, M. M., N. Bez, and A. Brind'Amour. "Influence of data pre-processing on the behavior of spatial indicators." Ecological Indicators. 99 (2019): 108–117.
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Joo, R., et al. "Metrics for describing dyadic movement: a review." Movement Ecology. 6.1 (2018).
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Rufino, M. M., N. Bez, and A. Brind'Amour. "Integrating spatial indicators in the surveillance of exploited marine ecosystems." Plos One. 13.11 (2018).
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Assali, C., N. Bez, and Y. Tremblay. "Seabird distribution patterns observed with fishing vessel’s radar reveal previously undescribed sub-meso-scale clusters." Scientific Reports. 7.1 (2017): 7364.
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Maufroy, A., et al. "Massive increase in the use of drifting Fish Aggregating Devices (dFADs) by tropical tuna purse seine fisheries in the Atlantic and Indian oceans." ICES J. Mar. Sci.. 74.1 (2017): 215–225.
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Drouineau, H., et al. "The need for a protean fisheries science to address the degradation of exploited aquatic ecosystems." Aquat. Living Resour.. 29.2 (2016): Unsp-E201.
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Morfin, M., N. Bez, and J. M. Fromentin. "Habitats of ten demersal species in the Gulf of Lions and potential implications for spatial management." Mar Ecol Prog Ser. 547 (2016): 219–232.
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Granger, V., et al. "Mapping diversity indices: not a trivial issue." Methods Ecol Evol. 6.6 (2015): 688–696.
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Granger, V., et al. "Large-scale spatio-temporal monitoring highlights hotspots of demersal fish diversity in the Mediterranean Sea." Progress in Oceanography. 130 (2015): 65–74.
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Walker, E., et al. "From forager tracks to prey distributions: an application to tuna vessel monitoring systems (VMS)." Ecological Applications. 25.3 (2015): 826–833.
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Bez, N., and C. B. Braham. "Indicator variables for a robust estimation of an acoustic index of abundance." Canadian Journal of Fisheries and Aquatic Sciences. 71.5 (2014): 709–718.
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Braham, C. B., et al. "New insights in the spatial dynamics of sardinella stocks off Mauritania (North-West Africa) based on logbook data analysis." Fisheries Research. 154 (2014): 195–204.
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Gimenez, O., et al. "Statistical ecology comes of age." Biology Letters. 10.12 (2014): 20140698.
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SARAUX, C., et al. "Spatial Structure and Distribution of Small Pelagic Fish in the Northwestern Mediterranean Sea." Plos One. 9.11 (2014): 1–12.
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Dagorn, L., et al. "How much do fish aggregating devices (FADs) modify the floating object environment in the ocean?" Fisheries Oceanography. 22.3 (2013): 147–153.
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Amandè, M., et al. "Precision in bycatch estimates : the case of tuna purse-seine fisheries in the Indian Ocean." ICES Journal of Marine Science. 69.8 (2012): 1501–1510.
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Dagorn, L., et al. "Targeting bigger schools can reduce ecosystem impacts of fisheries." Canadian Journal of Fisheries Aquatic Sciences. 69 (2012): 1463–1467.
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Grados, D., et al. "Multiscale characterization of spatial relationships among oxycline depth, macrozooplankton, and forage fish off Peru using geostatistics, principal coordinates of neighbour matrices (PCNMs), and wavelets." Canadian Journal of Fisheries and Aquatic Sciences. 69.4 (2012): 740–754.
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Morfin, M., et al. "Spatio-temporal patterns of key exploited marine species in the Northwestern Mediterranean Sea." Plos One. 7.5 (2012).
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Bez, N., and S. Bertrand. "The duality of fractals : roughness and self similarity." Theoretical Ecology. 4.3 (2011): 371–383.
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Bez, N., et al. "Fishing activity of tuna purse seiners estimated from vessels monitoring system (VMS) data." Canadian Journal of Fisheries and Aquatic Sciences. 68.11 (2011): 1998–2010.
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Gascuel, D., et al. "A future for marine fisheries in Europe (Manifesto of the Association Française d'Halieumétrie)." Fisheries Research. 109 (2011): 1–6.
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Diaz, E., et al. "Using indicators for evaluating, comparing, and communicating the ecological status of exploited marine ecosystems. 2. Setting the scene." Ices Journal of Marine Science. 67 (2010): 692–716.
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Gerlotto, F., et al. "When good neighbours become good friends: observing small scale structures in fish aggregations using multibeam sonar." Aquatic Living Resources. 23 (2010): 143–151.
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Shin, Y. - J., et al. "Using indicators for evaluating, comparing, and communicating the ecological status of exploited marine ecosystems. 2. Setting the scene." Ices Journal of Marine Science. 67.4 (2010): 692–716.
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Walker, E., and N. Bez. "A pioneer validation of a state-space model of vessel trajectories (VMS) with observers' data." Ecological Modelling. 221 (2010): 2008–2017.
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MARBEC MARine Biodiversity, Exploitation and Conservation, est une unité de recherche qui regroupe des personnels de 4 organismes : l’IRD, l’Ifremer, l’UM et le CNRS. Son objectif est l’étude de la biodiversité marine des écosystèmes lagunaires, côtiers et hauturiers à différents niveaux d’intégration, depuis les aspects moléculaires, individuels, populationnels et communautaires, et des usages de cette biodiversité par l’Homme. Nous rejoindre