Grégory MOLLOT

Post Doctoral Fellow

CEFE/CNRS
Campus du CNRS
1919, route de Mende
34293 Montpellier 5

Tél : +33/0 4 67 61 .. ..
Fax : +33/0 4 67 61 33 36

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Research topics

My work is focused on food web studies. The theory of food web helps to explain energy and matter fluxes through trophic interactions (feeding relationship) that exist between species in an ecosystem. Food webs are unidirectional, i.e. the flow occurs only in one direction : species A feed on species B, in this simple scheme, A is the consumer and B is the resource. The assembly of interactions by considering overall species in the system is the food web. The study of ecological systems through the food web theory allows the use of statistical tools developed to complex network analyses, for instance, structural analysis of a food web can provide information on functioning and stability (resilience/persistence). This approach can be very interesting to study the effect of a disturbance, as a biological invasion or extinction of species, on the stability of the food web.

The main difficulty faced with this approach is to reach an accurate description of the food web structure. In fact, food webs typically consists of hundreds or even thousands of interactions between species, and such set of interactions is dynamically altered in time and space. The construction of a food web by traditional methods (observation, bibliographic data compilation, etc…) can be very time-consuming and unsuitable. During my PhD, I worked on a DNA metabarcoding approach to effectively characterize the diet of arthropods, and I was able to reconstruct the food web of a banana plantation in the Caribbean. The approach is divided into four tasks:

1. Construction of a reference library with DNA barcodes of all species present in the system
2. Sampling and dissection of the gut content of each sampled specimen, DNA extraction, PCR and high-throughput sequencing
3. Identification of sequences by bioinformatics analysis (alignment of each raw sequence from the sequencing with all sequences included in the reference library)
4. The result is a binary interaction matrix (presence / absence) or semi-quantitative (for a given consumer species: proportion of individuals in which we detected the DNA of a given resource) that represents the consumer / resource interactions.

In the case of the Caribbean banana plantation, the approach identified three species of predators consuming the main pest of bananas (the banana weevil). This also helped to highlight the effect of the addition of a cover crop in a banana plantation on the food web structure, compared to a banana plantation on a bare soil: significant diet change of generalists predators to feed on alternative prey supported by the cover crop (here, Diptera). The result challenged our expectations, the underlying hypothesis being that the cover crop provides alternative prey (such as Diptera), which will allow an increase of predators abundances and therefore increased predation rate on the pest through apparent competition mechanism. Although we have observed the presence of alternative prey and increased predators’ abundances, we did not observe an increase of predation rate on the pest. Probably the high abundance of alternative prey and the easy-access to this food skewed the apparent competition in favour of alternative prey.

I am currently working on a meta-analysis (CESAB-FRB funding), which aims to highlight the effect of biological invasions on the food web structure and stability. This work will contribute to the design of a prediction model of biological invasions. (Supervisors : Patrice David & François Massol)

Brief CV

2014-2017 : Postdoc CNRS-CEFE (Montpellier), meta-analysis of the effect of biological invasions on food web stability.

2013-2014 : Postdoc INRA-PSH (Avignon), arthropods movement tracking with ovalbumin (white eggs powder) and ELISA immunoassay in apple orchards

2009-2012 : PhD CIRAD-PRAM Banana, plantain and pineapple cropping systems (Martinique, FWI), DNA metabarcoding and structural analysis of a banana food web

Publications

Mollot G, Duyck PF, Borowiec N, Glennac S, Quilici S (2015) Life-history traits of Encarsia guadeloupae, a natural enemy of the invasive spiralling whitefly Aleurodicus dispersus. Journal of Applied Entomology (in revision)

Mollot G, Duyck PF, Lefeuvre P, Lescourret F, Martin JF, Piry S, Canard E, Tixier P (2014) Cover cropping alters the diet of arthropods in a banana plantation: a metabarcoding approach. PLoS One e93740

Tixier P, Dagneaux D, Mollot G, Vinatier F, Duyck PF (2013) Weeds mediate the level of intraguild predation in arthropod food webs. Journal of Applied Entomology 137 (9) : 702-710

Tixier P, Peyrard N, Aubertot JN, Gaba S, Radoszycki J, Caron-Lormier G, Vinatier F, Mollot G, Sabbadin R (2013) Modelling interaction networks for enhanced ecosystem services in agroecosystems. Advances in Ecological Research 49 : 437-480

Mollot G, Tixier P, Lescourret F, Quilici S, Duyck PF (2012) New primary resource increase predation on a pest in a banana agroecosystem. Agricultural & Forest Entomology 14 (3) : 317-323

Projets actuellement financés dans l'équipe

Sont recensés ici les projets majeurs dont un membre de l'équipe est un des coordinateurs principaux.

• ERC (Europe)

RegEvol: The evolution of cis and transregulators in eukaryotes (2023-2028) porté par Thomas Lenormand (en collaboration avec Christoph Haag et Aline Muyle).

• RIA (Europe)

IMPTOX: An innovative analytical platform to investigate the effect and toxicity of micro and nano plastics combined with environmental contaminants on the risk of allergic disease in preclinical studies (2021-2025), avec Stéphanie Bedhomme comme partenaire (coordinatrice T. Cirkovic Velickovic, Université de Belgrade).

• ANR (France)

FRIDA: Fast Renewed Inbreeding Depression in Animals, porté par avec Patrice David (en collaboration avec Philippe Jarne et Aline Muyle).

IMPRINT: Genomic imprinting and separate sexes evolution, porté par Aline Muyle.

Supergene: Consequences of supergene evolution, porté par Mathieu Joron.

DivAlps: Diversification and adaptation along environmental gradients, avec Mathieu Joron comme partenaire (porteuse Laurence Després au LECA Grenoble). 

MINIGAN: "MITo Nuclear Interactions and Gynodioecy in ANimals" 2019-2023, porté par avec Patrice David (Philippe Jarne comme responsable de WP)

• Others:

WATERISK : Enrichment of emerging antibiotic resistance of public health concern in the hydric environment: toward a genomic, phenotypic and evolutionary-based proxy of exposition risk in a territory (2023-2026), funded by ExposUM, avec Stéphanie Bedhomme comme partenaire (porté par Estelle Jumas-Bilak, Hydrosciences Montpellier).

Mommy knows best (Climate & Biodiversity initiative, Céline Teplitsky). Fondation BNP Paribas (France).

COMPLEXADAPT - ExpEvolOcc (2022-2025): coordinateur L-M Chevin. Biodivoc Consortium de la région Occitanie.

ODE : Suivis de communautés de mollusques et de crustacés dans les eaux douces de Martinique (2023-2024), porteur : P. Jarne ; P. David participant).

MICROVECT : Evaluating the impact of diet, microbiota and environmental factors on vectorial capacity of vectors of zoonotic diseases in Occitanie (2022-2024), porteur: B. Gourbal (Perpignan), P. Jarne et P. David, animateurs d’un axe de travail.

Anciens projets

• ERC (Europe)

FluctEvol: Fluctuating selection, evolution, and plasticity in random environments (2016-2021), Starting Grant, L-M Chevin.

HGTCodonUse: The evolutionary significance of synonymous variations: Can codon usage preferences drive the propagation of antibiotic resistance? (2016-2021), Consolidator Grant, S. Bedhomme.

Dynamics of eco-evolutionary systems (2018-2023), Consolidator grant, Patrik Nosil.

SHE: Multil-level Selection in a Heterogeneous Environment (2014-2019), Starting Grant, A. Charmantier.

• ANR (France)

CisTransEvol: The evolution of cis and transregulators in eukaryotes (2023) porté par Thomas Lenormand, partenaires Christoph Haag et Aline Muyle.

NGB: Biosurveillance Next-Gen des changements dans la structure et fonctionnement des écosystèmes (2016-2020), avec Patrice David et Philippe Jarne comme partenaires (portée par D Bohan, Inrae Dijon)

ContempEvol: Prédire l'évolution contemporaine et la persistance des populations en environnement changeant (2011-2015), L-M Chevin.

PEPS: Potentiel évolutif en populations sauvages (2012-2016), C. Teplitsky & A. Charmantier.

SilentAdapt: Adaptation à des doses de pesticides variables (2014-2018), T. Lenormand.

SENSHYBLE: Ecologie Sensorielle des Zones d'Hybridation en Environnement Lentique (2011-2015), P-A Crochet.

AFFAIRS: Adaptation of Fragmented Freshwater assemblages in Rapidly-changing environmentS (2012-2016), P. David.

ESHAP: Evolution of Self-fertilization in Hermaphrodites : an Animal Perspective (2013-2016), P. David.

Doctorant

CEFE/CNRS
Campus du CNRS
1919, route de Mende
34293 Montpellier 5

Tél : +33/0 4 67 61 32 11
Fax : +33/0 4 67 61 33 36

Thèmes de recherche

Hétérogénéité environnementale et évolution des différences de traits de personnalité chez la mésange bleue (Cyaniste caeruleus).

Je suis une doctorante encadrée par Anne Charmantier et Denis Réale (Université du Québec à Montréal). Mon projet de doctorat porte sur les causes écologiques et évolutives de la diversité des traits de personnalité au sein d’une espèce animale. J’étudie des populations sauvages de mésanges bleues (Cyanistes caeruleus) en Corse (France) qui occupent des habitats avec des conditions écologiques très différentes. Je souhaite déterminer si l’on retrouve différents traits de personnalité chez les oiseaux qui vivent dans différents types d’habitats, si ces différences ont une base génétique et si elles sont issues de la sélection naturelle. Finalement, j’aimerais déterminer s’il existe un lien entre la variabilité interindividuelle des traits de personnalité à l’intérieur même des populations et l’hétérogénéité des conditions écologiques à fine échelle spatiale.

Environmental heterogeneity and the evolution of personality traits in blue tits (Cyaniste caeruleus)

I’m a Ph.D student supervised by Anne Charmantier and Denis Réale (Université du Québec à Montréal). My project addresses the evolutionary and ecological causes of personality in wild animal populations. I am studying blue tit populations living in contrasting environmental conditions in Corsica (France). My goal is to determine is these populations are showing phenotypic differences in personality traits, if these differences reflect genetic differences and if they are the product of natural selection. Finally, I hope to determine if phenotypic variability in a given population is related to fine scale environmental heterogeneity.

Publications

Montiglio, P.-O., Garant, D.; Bergeron, P., Dubuc Messier, G., Réale, D. (2014). Pulsed resources

and the coupling between life-history strategies and exploration patterns in eastern chipmunks

(Tamias striatus). Journal of Animal Ecology 83 (3), pp. 720-728

Dubuc Messier, G., Garant D., Bergeron, P., Réale, D., (2012). Environmental conditions affect

spatial genetic structures and dispersal patterns in a solitary rodent. Molecular ecology 21 (21), pp. 5363-5373

Post-doctorante

CEFE/CNRS

Campus du CNRS
1919, route de Mende
34293 Montpellier 5

Tél : +33/0 4 67 61 32 20

Fax : +33/0 4 67 61 33 36

celine.reisser[at]cefe.cnrs.fr

Bref CV

2013-             Postdoctoral fellow, CNRS CEFE UMR 5175, Montpellier, France

2012-13         Postdoctoral fellow, University of Fribourg, Fribourg, Switzerland

2008-12         PhD,   Victoria University of Wellington, Wellington, New Zealand

2005-2007     MSc,   University of California Santa Cruz, USAand Centre d’Oceanologie de Marseille, France

 Thèmes de recherche

I am broadly interested in the evolution of breeding systems, sex determination/differentiation and reproduction. I am currently using Next Generation Sequencing technologies and bioinformatic tools to study the attributes of a neo sex determining genomic region in Daphnia magna. I am looking at differentiation, recombination patterns and gene content.

I am also working on differential gene expression in sexual phenotypes.

Publications

[5] CMO Reisser, JJ Bell, JPA Gardner (2014) Correlation between pelagic larval duration and realised dispersal : long-distance genetic connectivity between northern New Zealand and the Kermadec Islands archipelago. Marine Biology, 161 : 297-312.

[4] CMO Reisser, B Marshall, JPA Gardner (2012) A morphometric approach supporting genetic results in the taxonomy of the New Zealand limpets of the Cellana strigilis complex (Mollusca : Patellogastropoda : Nacellidae). Invertebrate Systematics, 26 : 193-203.

[3] CMO Reisser, JJ Bell, JPA Gardner (2012) Isolation and characterization of polymorphic microsatellite markers for the intertidal sea snail Nerita melanotragus E.A. Smith, 1884 (Powell 1979). Molecular Ecology Resources, 12 : 570-572.

[2] CMO Reisser, AR Wood, JJ Bell, JPA Gardner (2011) Connectivity, small islands and large distances : the Cellana strigilis limpet complex of the Southern Ocean. Molecular Ecology, 20 : 3399-3413.

[1] CMO Reisser, R Beldade, G Bernardi (2009) Multiple paternity and competition in sympatric congeneric reef fishes, Embiotoca jacksonii and E. lateralis. Molecular Ecology, 18 : 1505-1510.

Liens

Research Gate:  www.researchgate.net/profile/Celine_Reisser