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PREMISE OF THE STUDY: Gene flow through dispersal of seeds and pollen is a fundamental determinant of spatial genetic structure (SGS) in natural populations of trees at different spatial scales. Within continuous populations, restrictions to gene flow should be manifested in a process of local genetic differentiation, known as isolation by distance. The present work examines the SGS of a Prosopis alba population in a patchy region where urban, forest, and agricultural areas coexist. The analysis discussed here expands our knowledge about the processes affecting the distribution of the genetic variability in populations of disturbed landscapes. METHODS: Three sites with different landscape and demographic characteristics were analyzed. Seven highly variable microsatellite markers were used to survey the relevance of both isolation by distance and stochastic migration in the SGS of the population. KEY RESULTS: The analyses showed that (1) the genetic similarity declined with increasing geographic distance, (2) the population may be conceived as a single genetically continuous unit showing spatial differentiation as consequence of isolation by distance, rather than a structured population following the island model, and (3) there is evidence supporting a past immigration event into one of the study sites, which promoted a local pattern of genetic structure. CONCLUSIONS: These results indicate that in spite of the population fragmentation produced by land-use changes, P. alba maintains the genetic cohesion and a continuous genetic structure in the analyzed area. © 2017 Botanical Society of America.


Documento: Artículo
Título:Isolation by distance and stochastic migration in a fragmented population of Prosopis alba
Autor:Roser, L.G.; Ferreyra, L.I.; Ewens, M.; Vilardi, J.C.; Saidman, B.O.
Filiación:Universidad de Buenos Aires, Consejo Nacional de lnvestigaciones Científicas y Técnicas, Instituto de Ecología, Genética y Evolución (IEGEBA), Facultad de Ciencias Exactas y Naturales, Departamento Ecología, Genética y Evolución, Genética de Especies Leñosas (GEEL), Buenos Aires, 1428, Argentina
Estación Experimental Fernández, Universidad Católica de Santiago del Estero, Santiago del Estero, 4200, Argentina
Instituto de Investigaciones Biotecnológicas (IIB-INTECH), Universidad Nacional de San Martín, Buenos Aires, 1650, Argentina
Palabras clave:Fabaceae; Isolation by distance; Kinship; Landscape genetics; Microsatellites; Prosopis alba; Spatial genetic structure; Stochastic migration; gene flow; genetic differentiation; genetic marker; genetic structure; genetics; habitat fragmentation; isolated population; kinship; landscape ecology; migration; seed dispersal; spatial variation; stochasticity; tree; Fabaceae; Prosopis alba; microsatellite DNA; Argentina; DNA sequence; ecosystem; gene flow; gene frequency; genetic variation; genetics; geography; growth, development and aging; Markov chain; pollen; population dynamics; population genetics; Prosopis; reproductive isolation; seed dispersal; Argentina; Ecosystem; Gene Flow; Gene Frequency; Genetic Variation; Genetics, Population; Geography; Microsatellite Repeats; Pollen; Population Dynamics; Prosopis; Reproductive Isolation; Seed Dispersal; Sequence Analysis, DNA; Stochastic Processes
Página de inicio:313
Página de fin:321
Título revista:American Journal of Botany
Título revista abreviado:Am. J. Bot.


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---------- APA ----------
Roser, L.G., Ferreyra, L.I., Ewens, M., Vilardi, J.C. & Saidman, B.O. (2017) . Isolation by distance and stochastic migration in a fragmented population of Prosopis alba. American Journal of Botany, 104(2), 313-321.
---------- CHICAGO ----------
Roser, L.G., Ferreyra, L.I., Ewens, M., Vilardi, J.C., Saidman, B.O. "Isolation by distance and stochastic migration in a fragmented population of Prosopis alba" . American Journal of Botany 104, no. 2 (2017) : 313-321.
---------- MLA ----------
Roser, L.G., Ferreyra, L.I., Ewens, M., Vilardi, J.C., Saidman, B.O. "Isolation by distance and stochastic migration in a fragmented population of Prosopis alba" . American Journal of Botany, vol. 104, no. 2, 2017, pp. 313-321.
---------- VANCOUVER ----------
Roser, L.G., Ferreyra, L.I., Ewens, M., Vilardi, J.C., Saidman, B.O. Isolation by distance and stochastic migration in a fragmented population of Prosopis alba. Am. J. Bot. 2017;104(2):313-321.