Great Genetic Diversity but High Selfing Rates and Short-Distance Gene Flow Characterize Populations of a Tree (Foetidia; Lecythidaceae) in the Fragmented Tropical Dry Forest of the Mascarene Islands
| Autor: | Gérard Lebreton, Olivier Flores, Florent Martos, Nicolas Cuénin, Eric Rivière, Bernard Reynaud |
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| Přispěvatelé: | Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad), UMR Peuplement Végétaux et Bioagresseurs en Milieu Tropical (UMR PVBMT - INRA), Institut National de la Recherche Agronomique (INRA), Université de La Réunion (UR), Peuplements végétaux et bioagresseurs en milieu tropical (UMR PVBMT), Institut de Recherche pour le Développement (IRD)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Université de La Réunion (UR)-Institut National de la Recherche Agronomique (INRA), Institut de Systématique, Evolution, Biodiversité (ISYEB ), Muséum national d'Histoire naturelle (MNHN)-École pratique des hautes études (EPHE)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA), Muséum national d'Histoire naturelle (MNHN), Sorbonne Université (SU), Université des Antilles (UA), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Université de La Réunion (UR), Muséum national d'Histoire naturelle (MNHN)-École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université des Antilles (UA) |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
0301 basic medicine [SDV]Life Sciences [q-bio] forêt tropicale État dispersé Forests 01 natural sciences F30 - Génétique et amélioration des plantes Fixation index Trees érosion génétique Lecythidaceae Croisement Genetics (clinical) Phylogeny Islands biology Ecology Reproduction Méthode d'accouplement Seeds Pollen Genetic isolate Biotechnology Tropical and subtropical dry broadleaf forests Gene Flow 010603 evolutionary biology 03 medical and health sciences Variation génétique Genetics Genetic erosion Molecular Biology Mauritiana Genetic diversity Tropical Climate [SDV.GEN]Life Sciences [q-bio]/Genetics fragmentation de l'habitat Selfing Genetic Variation 15. Life on land biology.organism_classification Structure du peuplement 030104 developmental biology Genetics Population |
| Zdroj: | Journal of Heredity Journal of Heredity, Oxford University Press (OUP), 2019, 110 (3), pp.287-299. ⟨10.1093/jhered/esy069⟩ |
| ISSN: | 0022-1503 |
| DOI: | 10.1093/jhered/esy069⟩ |
| Popis: | International audience; Following the global trend of deforestation and degradation, tropical dry forests in the Mascarenes archipelago on Reunion has undergone harsh reduction and fragmentation within 3 centuries of human occupation. We investigated the genetic diversity, mating system, and gene flow in fragmented populations of the native tree Foetidia mauritiana (Lecythidaceae) on Reunion, using microsatellite genotyping of adults (in- and ex situ) and seed progenies (in situ only). To test genetic isolation between the Mascarene islands, we also genotyped conspecific adults on Mauritius, and trees of Foetidia rodriguesiana on Rodrigues. We found a high genetic diversity among the trees on Reunion, but no population structure (G′ST: 0.039–0.090), and an increase of the fixation index (FIS) from adults to progenies. A subsequent analysis of mating systems from progeny arrays revealed selfing rates >50% in fragmented populations and close to 100% in lone trees. A paternity analysis revealed pollen flow ranging from 15.6 to 296.1 m within fragments. At broader scale, the populations of F. mauritiana on Reunion and Mauritius are genetically differentiated. The morphologically allied taxa F. rodriguesiana and F. mauritiana are clearly isolated. Therefore, this case study shows that genetic diversity may persist after deforestation, especially in long-lived tree species, but the reproductive features may be deeply altered during this process. This would explain the low seed production and the absence of recruitment in F. mauritiana. Restoration programs should take into account these features, as well as the importance that trees ex situ represent in restoring and conserving diversity. |
| Databáze: | OpenAIRE |
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