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1. Model-based assessment of Chikungunya and O’nyong-nyong virus circulation in Mali in a serological cross-reactivity context

Author

Hozé, Nathanaël, Diarra, Issa, Sangaré, Abdoul Karim, Pastorino, Boris, Pezzi, Laura, Kouriba, Bourèma, Sagara, Issaka, Dabo, Abdoulaye, Djimdé, Abdoulaye, Thera, Mahamadou Ali, Doumbo, Ogobara K., de Lamballerie, Xavier, Cauchemez, Simon, Modélisation mathématique des maladies infectieuses - Mathematical modelling of Infectious Diseases, Institut Pasteur [Paris] (IP)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Unité des Virus Emergents (UVE), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut National de la Santé et de la Recherche Médicale (INSERM), Malaria Research and Training Center [Bamako, Mali], Université de Bamako, Centre d'Infectiologie Charles Mérieux, Bamako, Mali, Laboratoire de Virologie [UNIV Corse-Inserm] (EA7310), Université Pascal Paoli (UPP)-Institut National de la Santé et de la Recherche Médicale (INSERM), Nathanaël Hozé and Simon Cauchemez acknowledge financial support from the AXA Research Fund, the Investissement d’Avenir program, the Laboratoire d’Excellence Integrative Biology of Emerging Infectious Diseases program (Grant ANR-10-LABX-62-IBEID), the INCEPTION project (PIA/ANR-16-CONV-0005), We thank the European Union’s Horizon 2020 research and innovation program under ZIKAlliance grant agreement No. 734548 and the Minister of Health and Hygiene of Mali supported this work through the subvention no. 2016/668116-0 from the Mali World Health Organization Local Office., We dedicate this article to Ogobara K. Doumbo, who initiated this project before he passed. May he rest in peace. We thank Christine Isnard from EFS, Marseille for invaluable technical contribution. We are grateful to Ismaila Thera, from MRTC, Bamako who developed the electronic database using ODK and provided the data management service for the study. We also thank the study district health officers and the study population for their cooperation. Specifically, we are indebted to Hamma Maiga, Bakary Sidibé, Modibo Diarra, Kassoum Kayentao, Souleymane Dama, Hamidou Niangaly, Amadou Bamadio, Hamadoun Diaité, Karim Traoré and Balla Diarra for their support to field investigations., ANR-10-LABX-0062,IBEID,Integrative Biology of Emerging Infectious Diseases(2010), ANR-16-CONV-0005,INCEPTION,Institut Convergences pour l'étude de l'Emergence des Pathologies au Travers des Individus et des populatiONs(2016), European Project: 734548,ZIKAlliance(2016), Limouzin, Cécile, Integrative Biology of Emerging Infectious Diseases - - IBEID2010 - ANR-10-LABX-0062 - LABX - VALID, Institut Convergences pour l'étude de l'Emergence des Pathologies au Travers des Individus et des populatiONs - - INCEPTION2016 - ANR-16-CONV-0005 - CONV - VALID, A global alliance for Zika virus control and prevention - ZIKAlliance - 2016-10-01 - 2019-09-30 - 734548 - VALID, Institut Pasteur [Paris]-Centre National de la Recherche Scientifique (CNRS), and Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Pascal Paoli (UPP)

Subjects
Statistical methods, Viral epidemiology, Epidemiology, viruses, Science, MESH: Algorithms, [MATH] Mathematics [math], MESH: Chikungunya Fever, Cross Reactions, Mali, Sensitivity and Specificity, Article, MESH: Cross Reactions, Seroepidemiologic Studies, MESH: Martinique, parasitic diseases, Humans, O'nyong-nyong Virus, Martinique, [MATH]Mathematics [math], Models, Statistical, MESH: Seroepidemiologic Studies, MESH: Humans, Reproducibility of Results, virus diseases, MESH: Chikungunya virus, MESH: Mali, MESH: Sensitivity and Specificity, MESH: O'nyong-nyong Virus, MESH: Reproducibility of Results, Viral infection, Chikungunya Fever, Chikungunya virus, Algorithms, MESH: Models, Statistical
Abstract

Serological surveys are essential to quantify immunity in a population but serological cross-reactivity often impairs estimates of the seroprevalence. Here, we show that modeling helps addressing this key challenge by considering the important cross-reactivity between Chikungunya (CHIKV) and O’nyong-nyong virus (ONNV) as a case study. We develop a statistical model to assess the epidemiology of these viruses in Mali. We additionally calibrate the model with paired virus neutralization titers in the French West Indies, a region with known CHIKV circulation but no ONNV. In Mali, the model estimate of ONNV and CHIKV prevalence is 30% and 13%, respectively, versus 27% and 2% in non-adjusted estimates. While a CHIKV infection induces an ONNV response in 80% of cases, an ONNV infection leads to a cross-reactive CHIKV response in only 22% of cases. Our study shows the importance of conducting serological assays on multiple cross-reactive pathogens to estimate levels of virus circulation., O’nyong nyong and Chikungunya virus are arboviruses present in Africa but their prevalence is unknown, partly due to high antibody cross-reactivity with one another. Here, the authors develop a statistical model that accounts for cross-reactivity to characterise circulation of both viruses from seroprevalence surveys.

Published
2021
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2. Pregnancy Outcomes after ZIKV Infection in French Territories in the Americas

Author

Yoann Madec, Cécile Herrmann-Storck, Arnaud Fontanet, Bruno Hoen, Caroline Callier, Raymond Césaire, Dominique Rousset, Alice Monthieux, Cédric Laouénan, Manon Boullard, Anna L. Funk, Maylis Douine, S. Stegmann-Planchard, Benoit Tressières, Bruno Schaub, Fatiha Najioullah, Jean-Luc Voluménie, Eustase Janky, André Cabié, Gabriel Carles, Kinda Schepers, Samson Yassinguezo, Sylvie Cassadou, Vanessa Ardillon, Philippe Kadhel, Mathieu Nacher, Catherine Ryan, CHU Pointe-à-Pitre/Abymes [Guadeloupe], Centre d'investigation clinique Antilles-Guyane (CIC - Antilles Guyane), Institut National de la Santé et de la Recherche Médicale (INSERM)-CHU Pointe-à-Pitre/Abymes [Guadeloupe] -CHU de la Martinique [Fort de France]-Centre Hospitalier Andrée Rosemon [Cayenne, Guyane Française], Université des Antilles et de la Guyane (UAG), Maison de la Femme de la Mère et de l'Enfant [CHU de la Martinique] (MFME [Fort de France]), CHU de la Martinique [Fort de France], Epidémiologie des Maladies Emergentes - Emerging Diseases Epidemiology, Pasteur-Cnam Risques infectieux et émergents (PACRI), Institut Pasteur [Paris] (IP)-Conservatoire National des Arts et Métiers [CNAM] (CNAM), HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-Institut Pasteur [Paris] (IP)-Conservatoire National des Arts et Métiers [CNAM] (CNAM), HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM)-HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM), Santé publique France - French National Public Health Agency [Saint-Maurice, France], Centre Hospitalier de l'Ouest Guyanais Franck Joly [Saint-Laurent-du-Maroni, Guyane Française], Infection, Anti-microbiens, Modélisation, Evolution (IAME (UMR_S_1137 / U1137)), Université Paris 13 (UP13)-Université Paris Diderot - Paris 7 (UPD7)-Université Sorbonne Paris Cité (USPC)-Institut National de la Santé et de la Recherche Médicale (INSERM), Université des Antilles et de la Guyane - UFR des sciences médicales (UAG UFR SM), Institut Pasteur de la Guyane, Réseau International des Instituts Pasteur (RIIP), Maladies infectieuses et tropicales dans la Caraïbe (MAITC EA 4537), CHU Pointe-à-Pitre/Abymes [Guadeloupe] -CHU de la Martinique [Fort de France]-Université des Antilles (UA), Centre Hospitalier Louis Constant Fleming, Centre Hospitalier Andrée Rosemon [Cayenne, Guyane Française], Center for Global Health Research and Education - Centre pour la Recherche et la Formation en Santé Mondiale (CGH), Institut Pasteur [Paris] (IP)-Réseau International des Instituts Pasteur (RIIP), Conservatoire National des Arts et Métiers [CNAM] (CNAM), HESAM Université - Communauté d'universités et d'établissements Hautes écoles Sorbonne Arts et métiers université (HESAM), Supported by the French Ministry of Health (Soutien Exceptionnel à la Recherche et à l’Innovation), by a grant (ANR-10-LABX-62-IBEID) from Laboratoire d’Excellence Integrative Biology of Emerging Infectious Diseases project, by the ZIKAlliance consortium (the European Union’s Horizon 2020 Research and Innovation Program), and by INSERM. This study is part of the ZIKAlliance consortium project., We thank the women who participated in this study, all the physicians, midwives, clinical research assistants, health officers, and epidemiologists who helped conduct this study in each of the French territories in the Americas: Myriam Atine, Lyderic Aubert, Marie Barrau, Kebe Beavogui, Christelle Celeste, Joelle Colat-Peyron, Elvire Couchy, Véronique Davidas, Lucetta Delver, Jacqueline Dubois, Stanie Gaete, Dorothée Harrois, Marie-Laure Lalanne-Mistrih, Mathilde Melin, Marie-France Mirane, Francelise Nadessein, Marie-Josée Pelczar, Véronique Plantier, Céline Rocquet, Magdalena Saint-Marc, Patrick Saint-Martin, Valérie Soter, Ingrid Soubdhan, Jennifer Taillefond, Lambo Velonasy, and Véronique Walter (Guadeloupe), Nicole Ambroisine, Gilda Belrose, Alain Blateau, Patricia Blondel, Isabelle Calmont, Valérie Decatrelle, Michèle Gueneret, Eugénie Jolivet, Isabelle Komla-Soukha, Corinne Plavonil, Marie-andrée Pyram, and Jean-Luc Voluménie (Martinique), Antoine Adenis, Audrey Andrieu, Luisiane Carvalho, Sandy Dabrowski, Céline Delorme, Maryvonne Dueymes, Aniza Fahrasmane, Arthur Felix, Hélène Hilderal, Anne Jolivet, Justine Krajewsky, Véronique Lambert, Thomas Lemaitre, Myriam Livain, Jérémie Pasquier, Marion Petit-Sinturel, Céline Pomar, Léo Pomar, and Stéphanie Rogier (French Guiana), and David Baud (University of Lausanne, Switzerland) and Rebecca Grant (Institut Pasteur de Paris, France) for their critical review of an earlier version of the manuscript., ANR-10-LABX-0062,IBEID,Integrative Biology of Emerging Infectious Diseases(2010), Jonchère, Laurent, Integrative Biology of Emerging Infectious Diseases - - IBEID2010 - ANR-10-LABX-0062 - LABX - VALID, Institut National de la Santé et de la Recherche Médicale (INSERM)-CHU de la Martinique [Fort de France]-CHU Pointe-à-Pitre/Abymes [Guadeloupe] -Centre Hospitalier Andrée Rosemon [Cayenne, Guyane Française], Institut Pasteur [Paris]-Conservatoire National des Arts et Métiers [CNAM] (CNAM)-Institut Pasteur [Paris]-Conservatoire National des Arts et Métiers [CNAM] (CNAM), CHU Pointe-à-Pitre/Abymes [Guadeloupe] -Université des Antilles (UA)-CHU de la Martinique [Fort de France], and Réseau International des Instituts Pasteur (RIIP)-Institut Pasteur [Paris]

Subjects
0301 basic medicine, Microcephaly, [SDV]Life Sciences [q-bio], Chromosome Disorders, MESH: Amniotic Fluid, Zika virus, Cohort Studies, 0302 clinical medicine, MESH: Pregnancy, Pregnancy, MESH: Martinique, ZikV Infection, Medicine, 030212 general & internal medicine, Pregnancy Complications, Infectious, Prospective cohort study, Guadeloupe, MESH: Cohort Studies, MESH: Chromosome Disorders, MESH: Middle Aged, biology, Zika Virus Infection, Obstetrics, MESH: Infant, Newborn, Pregnancy Outcome, Gestational age, MESH: Congenital Abnormalities, General Medicine, Middle Aged, French Guiana, 3. Good health, [SDV] Life Sciences [q-bio], Fetal Diseases, MESH: Fetal Diseases, MESH: Young Adult, Cohort, Female, Pregnancy Trimesters, Adult, medicine.medical_specialty, Adolescent, MESH: Zika Virus, Article, MESH: Microcephaly, Congenital Abnormalities, Young Adult, 03 medical and health sciences, MESH: Zika Virus Infection, MESH: French Guiana, Humans, MESH: Guadeloupe, Martinique, MESH: Pregnancy Complications, Infectious, Pregnancy outcomes, MESH: Adolescent, Fetus, MESH: Humans, business.industry, Infant, Newborn, MESH: Adult, Zika Virus, Amniotic Fluid, medicine.disease, biology.organism_classification, MESH: Pregnancy Outcome, Confidence interval, 030104 developmental biology, business, MESH: Female, MESH: Pregnancy Trimesters
Abstract

International audience; BACKGROUND:The risk of congenital neurologic defects related to Zika virus (ZIKV) infection has ranged from 6 to 42% in various reports. The aim of this study was to estimate this risk among pregnant women with symptomatic ZIKV infection in French territories in the Americas.METHODS:From March 2016 through November 2016, we enrolled in this prospective cohort study pregnant women with symptomatic ZIKV infection that was confirmed by polymerase-chain-reaction (PCR) assay. The analysis included all data collected up to April 27, 2017, the date of the last delivery in the cohort.RESULTS:Among the 555 fetuses and infants in the 546 pregnancies included in the analysis, 28 (5.0%) were not carried to term or were stillborn, and 527 were born alive. Neurologic and ocular defects possibly associated with ZIKV infection were seen in 39 fetuses and infants (7.0%; 95% confidence interval, 5.0 to 9.5); of these, 10 were not carried to term because of termination of pregnancy for medical reasons, 1 was stillborn, and 28 were live-born. Microcephaly (defined as head circumference more than 2 SD below the mean for sex and gestational age) was detected in 32 fetuses and infants (5.8%), of whom 9 (1.6%) had severe microcephaly (more than 3 SD below the mean). Neurologic and ocular defects were more common when ZIKV infection occurred during the first trimester (24 of 189 fetuses and infants [12.7%]) than when it occurred during the second trimester (9 of 252 [3.6%]) or third trimester (6 of 114 [5.3%]) (P=0.001).CONCLUSIONS:Among pregnant women with symptomatic, PCR-confirmed ZIKV infection, birth defects possibly associated with ZIKV infection were present in 7% of fetuses and infants. Defects occurred more frequently in fetuses and infants whose mothers had been infected early in pregnancy. Longer-term follow-up of infants is required to assess any manifestations not detected at birth. (Funded by the French Ministry of Health and others; ClinicalTrials.gov number, NCT02916732 .).

Published
2018
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3. Combination of ELISA screening and seroneutralisation tests to expedite Zika virus seroprevalence studies

Author

Christophe N. Peyrefitte, Audrey Dubot-Pérès, Paola Mariela Saba Villarroel, Xavier de Lamballerie, Laetitia Ninove, Yelin Roca, Stéphane Priet, Elif Nurtop, Gilda Grard, Bouba Gake, Pierre Gallian, Jan Felix Drexler, Boris Pastorino, Unité des Virus Emergents (UVE), Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut National de la Santé et de la Recherche Médicale (INSERM), Centro Nacional de Enfermedades Tropicales [Santa Cruz de la Sierra, Bolivia] (CENETROP), Charité - UniversitätsMedizin = Charité - University Hospital [Berlin], Centre Pasteur du Cameroun, Réseau International des Instituts Pasteur (RIIP), Institut de Recherche pour le Développement (IRD), Institut de Recherche Biomédicale des Armées [Antenne Marseille] (IRBA), Etablissement Français du Sang - Alpes-Méditerranée (EFS - Alpes-Méditerranée), Etablissement Français du Sang, This work was partially supported by the European Union’s Horizon 2020 Research and Innovation Programme under ZIKAlliance Grant Agreement no. 734548 and the European Virus Archive EVAg, European Union- Horizon 2020 programme under grant agreement no. 653316., European Project: 734548,ZIKAlliance(2016), European Project: 653316,H2020,H2020-INFRAIA-2014-2015,EVAg(2015), Dubois Frid, Caroline, A global alliance for Zika virus control and prevention - ZIKAlliance - 2016-10-01 - 2019-09-30 - 734548 - VALID, and European Virus Archive goes global - EVAg - - H20202015-04-01 - 2019-03-31 - 653316 - VALID

Subjects
0301 basic medicine, viruses, Antibodies, Viral, Zika virus, Dengue fever, MESH: Antibodies, Neutralizing, Cytopathogenic Effect, Viral, Seroepidemiologic Studies, MESH: Martinique, Combination strategy, Mass Screening, Cytopathic effect, [SDV.MP.VIR] Life Sciences [q-bio]/Microbiology and Parasitology/Virology, MESH: Immunoglobulin G, education.field_of_study, Microscopy, biology, Zika Virus Infection, MESH: Neutralization Tests, MESH: Enzyme-Linked Immunosorbent Assay, 3. Good health, Infectious Diseases, [SDV.MP.VIR]Life Sciences [q-bio]/Microbiology and Parasitology/Virology, MESH: Microscopy, Population, Virus Neutralization, Enzyme-Linked Immunosorbent Assay, MESH: Zika Virus, Sensitivity and Specificity, lcsh:Infectious and parasitic diseases, 03 medical and health sciences, MESH: Zika Virus Infection, Neutralization Tests, Virology, medicine, Seroprevalence, Humans, lcsh:RC109-216, Martinique, Serologic Tests, MESH: Mass Screening, education, Igg elisa, Seroepidemiology, MESH: Seroepidemiologic Studies, MESH: Humans, MESH: Serologic Tests, Correction, biochemical phenomena, metabolism, and nutrition, biology.organism_classification, medicine.disease, MESH: Cytopathogenic Effect, Viral, Antibodies, Neutralizing, MESH: Sensitivity and Specificity, 030104 developmental biology, [SDV.SPEE] Life Sciences [q-bio]/Santé publique et épidémiologie, Immunoglobulin G, [SDV.SPEE]Life Sciences [q-bio]/Santé publique et épidémiologie, Virus neutralization test, MESH: Antibodies, Viral
Abstract

International audience; Here we propose a strategy allowing implementing efficient and practicable large-scale seroepidemiological studies for Zika Virus (ZIKV). It combines screening by a commercial NS1 protein-based Zika IgG ELISA, and confirmation by a cytopathic effect-based virus neutralization test (CPE-based VNT). In post-epidemic samples from Martinique Island blood donors (a population with a dengue seroprevalence above 90%), this strategy allowed reaching specificity and sensitivity values over 98%. The CPE-based VNT consists of recording CPE directly under the optical microscope, which is easy to identify with ZIKV strain H/PF/2013 at day 5 pi. Overall, considered that CPE-based VNT is cost effective and widely automatable, the NS1 protein-based Zika IgG ELISA+CPE-based VNT combination strategy represents a convenient tool to expedite ZIKV seroprevalence studies.

Published
2018
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4. Factors Associated with Severe Leptospirosis, Martinique, 2010–2013

Author

Mathieu Picardeau, Isabelle Lamaury, Guillaume Hurtrel, Jean-Marie Delord, Ruddy Valentino, Roland Martinez, Pascale Bourhy, Patrick Hochedez, Hossein Mehdaoui, Claude Olive, Rafaelle Théodose, Nicolas Vignier, Cécile Herrmann, Raymond Césaire, André Cabié, Centre Hospitalier Universitaire de Martinique [Fort-de-France, Martinique], Université des Antilles et de la Guyane (UAG), Centre Collaborateur FAO/OMS pour l'épidémiologie de la leptospirose, Institut Pasteur [Paris] (IP), Centre National de Référence de la Leptospirose - National Reference Center Leptospirosis (CNR), Biologie des Spirochètes / Biology of Spirochetes, Hôpital Avicenne [AP-HP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP), Centre hospitalier de Trinité MARTINIQUE, Centre hospitalier du Lamentin MARTINIQUE, CHU Pointe-à-Pitre/Abymes [Guadeloupe], Institut National de la Santé et de la Recherche Médicale (INSERM), We also thank the French Ministry of Health with the participation of the Groupement Interrégional de Recherche Clinique et d’Innovation Sud-Ouest Outre-Mer for funding and the Direction de la Recherche Clinique et de Innovation of the University Hospital of Fort-de-France, Martinique, France, for methodologic support., We thank Olivier Verlaeten and Ludovic Jeanneau, who introduced the qPCR technique in the University Hospital of Fort de France, Dorothée Haug and the technical staff at the Service de Bactériologie of the University Hospital of Fort-de-France, Janick Jean-Marie and the staff at the Centre d’Investigation Clinique et d’Epidémiologie Clinique Antilles-Guyane (Institut National de la Santé et de la Re- cherche Médicale CIE 802), Christopher Pappas for editorial assistance, and Eric Caumes for critical review of the manu- script., MURGUET, SYLVIE, and Institut Pasteur [Paris]

Subjects
Male, Serotype, Epidemiology, [SDV]Life Sciences [q-bio], lcsh:Medicine, Disease Outbreaks, MESH: Dogs, 0302 clinical medicine, MESH: Martinique, Zoonoses, MESH: Animals, Dog Diseases, MESH: Disease Outbreaks, bacteria, 0303 health sciences, MESH: Middle Aged, medicine.diagnostic_test, biology, Dispatch, Factors Associated with Severe Leptospirosis, Martinique, 2010–2013, MESH: Leptospirosis, Middle Aged, Leptospirosis, 3. Good health, [SDV] Life Sciences [q-bio], qPCR, Infectious Diseases, [SDV.MP]Life Sciences [q-bio]/Microbiology and Parasitology, severe leptospirosis, Female, medicine.symptom, MESH: Zoonoses, Martinique, Leptospira interrogans, Adult, Microbiology (medical), MESH: Dog Diseases, 030231 tropical medicine, leptospiremia, lcsh:Infectious and parasitic diseases, 03 medical and health sciences, Dogs, Disease severity, medicine, Animals, Humans, lcsh:RC109-216, [SDV.MP] Life Sciences [q-bio]/Microbiology and Parasitology, Prothrombin time, MESH: Humans, 030306 microbiology, business.industry, lcsh:R, MESH: Adult, Auscultation, medicine.disease, biology.organism_classification, serogroup Icterohaemorrhagiae, MESH: Male, Immunology, quantitative PCR, Anuria, business, MESH: Female
Abstract

International audience; To identify factors associated with disease severity, we examined 102 patients with quantitative PCR-confirmed leptospirosis in Martinique during 2010-2013. Associated factors were hypotension, chest auscultation abnormalities , icterus, oligo/anuria, thrombocytopenia, prothrombin time

Published
2015
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5. Hybridization and invasiveness in the freshwater snail Melanoides tuberculata: hybrid vigour is more important than increase in genetic variance

Author

Facon, B., Jarne, P., Pointier, J. P., David, P., Department of Ecology and Evolution [Lausanne], Université de Lausanne (UNIL), Centre d’Ecologie Fonctionnelle et Evolutive (CEFE), Université Paul-Valéry - Montpellier 3 (UPVM)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD [France-Sud])-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Laboratoire de biologie marine et malacologie, Université de Perpignan Via Domitia (UPVD)-École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Department of Ecology and Evolution, Institut de Recherche pour le Développement (IRD [France-Sud])-Centre National de la Recherche Scientifique (CNRS)-École pratique des hautes études (EPHE)-Université de Montpellier (UM)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Université Paul-Valéry - Montpellier 3 (UM3), and Université de Perpignan Via Domitia (UPVD)-École pratique des hautes études (EPHE)-Centre National de la Recherche Scientifique (CNRS)

Subjects
MESH: Selection (Genetics), Snails, MESH: Genetics, Population, Fresh Water, MESH: Research Support, Non-U.S. Gov't, MESH: Phenotype, MESH: Hybrid Vigor, Thiaridae, MESH: Demography, MESH: Martinique, MESH: Analysis of Variance, Hybrid Vigor, heterosis, Animals, Body Size, Martinique, MESH: Animals, Selection, Genetic, parthenogenesis, MESH: Snails, hybridization, Demography, Analysis of Variance, invasive snails, MESH: Body Size, [SDV.BID.EVO]Life Sciences [q-bio]/Biodiversity/Populations and Evolution [q-bio.PE], Genetic Variation, MESH: Fertility, MESH: Comparative Study, life-history traits, MESH: Hybridization, Genetic, Fertility, Genetics, Population, Phenotype, invasion success, MESH: Fresh Water, Hybridization, Genetic, MESH: Variation (
Abstract

Many invasive taxa are hybrids, but how hybridization boosts the invasive process remains poorly known. We address this question in the clonal freshwater snail Melanoides tuberculata from Martinique, using three parental and two hybrid lines. We combine an extensive field survey (1990-2003) and a quantitative genetic experiment to show that hybrid lines have outcompeted their parents in natural habitats, and that this increased invasiveness co-occurred with pronounced shifts in life-history traits, such as growth, fecundity and juvenile size. Given the little time between hybrid creation and sampling, and the moderate standing genetic variance for life-history traits in hybrids, we show that some of the observed trait changes between parents and hybrids were unlikely to arise only by continuous selection. We therefore suggest that a large part of hybrid advantage stems from immediate heterosis upon hybridization.

Published
2005
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