Self-fertilization, long-distance flash invasion and biogeography shape the population structure of Pseudosuccinea columella at the worldwide scale

Manon Lounnas (1) , a C Correa (1) , A. Vazquez (2) , A Dia (1) , Js Escobar (3) , A Nicot (1) , J Arenas (4) , R Ayaqui (5) , M.P. Dubois (6, 7) , Jean-Pierre J.-P. Pointier (8) , T Gimenez (9) , A. Gutierrez (10) , Carolina González-Ramírez (11) , O. Noya (12) , Lucila Prepelitchi (13) , N. Uribe (14) , C. Wisnivesky-Colli (15) , M. Yong (10) , Patrice David (6) , E. S. Loker (16) , Philippe Jarne (6) , Sylvie Hurtrez-Boussès (1)

1 MIVEGEC - Maladies infectieuses et vecteurs : écologie, génétique, évolution et contrôle
2 GEPV - Génétique et évolution des populations végétales
3 Vidarium Nutrition
4 Laboratorio de Biología Marina, Departamento de Fisiología y Zoología, Facultad de Biología
5 Departamento de Microbiologia y Patologia
6 CEFE - Centre d’Ecologie Fonctionnelle et Evolutive
7 UM2 - Université Montpellier 2 - Sciences et Techniques
8 CRIOBE - Centre de recherches insulaires et observatoire de l'environnement
9 Departamento de Parasitologia
10 Laboratorio de Malacologia
11 Laboratorio de Investigaciones Parasitológicas ''Dr. Jesús Moreno Rangel''
12 Seccion de Biohelmintiasis
13 CONICET - Consejo Nacional de Investigaciones Científicas y Técnicas [Buenos Aires]
14 Escuela de Bacteriologia y Laboratorio Clinico
15 Unidad de Ecología de Reservorios y Vectores de Parásitos [Buenos Aires]
16 Department of Biology [New Mexico]

Population genetic studies are efficient for inferring the invasion history based on a comparison of native and invasive populations, especially when conducted at species scale. An expected outcome in invasive populations is variability loss, and this is especially true in self-fertilizing species. We here focus on the self-fertilizing Pseudosuccinea columella, an invasive hermaphroditic freshwater snail that has greatly expanded its geographic distribution and that acts as intermediate host of Fasciola hepatica, the causative agent of human and veterinary fasciolosis. We evaluated the distribution of genetic diversity at the largest geographic scale analysed to date in this species by surveying 80 populations collected during 16 years from 14 countries, using eight nuclear microsatellites and two mitochondrial genes. As expected, populations from North America, the putative origin area, were strongly structured by selfing and history and harboured much more genetic variability than invasive populations. We found high selfing rates (when it was possible to infer it), none-to-low genetic variability and strong population structure in most invasive populations. Strikingly, we found a unique genotype/haplotype in populations from eight invaded regions sampled allover the world. Moreover, snail populations resistant to infection by the parasite are genetically distinct from susceptible populations. Our results are compatible with repeated introductions in South America and flash worldwide invasion by this unique genotype/haplotype. Our study illustrates the population genetic consequences of bio- logical invasion in a highly selfing species at very large geographic scale. We discuss how such a large-scale flash invasion may affect the spread of fasciolosis

Domains: Invertebrate Zoology; Parasitology; Populations and Evolution [q-bio.PE]

Manon Lounnas, a C Correa, A. Vazquez, A Dia, Js Escobar, et al.. Self-fertilization, long-distance flash invasion and biogeography shape the population structure of Pseudosuccinea columella at the worldwide scale. Molecular Ecology Notes, 2016, 26, ⟨10.1111/mec.13984⟩. ⟨hal-01557951⟩