Isolation by distance and stochastic migration in a fragmented population of Prosopis alba
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 genet...
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todo:paper_00029122_v104_n2_p313_Roser2023-10-03T13:54:37Z Isolation by distance and stochastic migration in a fragmented population of Prosopis alba Roser, L.G. Ferreyra, L.I. Ewens, M. Vilardi, J.C. Saidman, B.O. 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 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. Fil:Roser, L.G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Ferreyra, L.I. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Vilardi, J.C. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Saidman, B.O. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00029122_v104_n2_p313_Roser |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
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 |
| spellingShingle |
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 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 |
| topic_facet |
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 |
| description |
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. |
| format |
JOUR |
| author |
Roser, L.G. Ferreyra, L.I. Ewens, M. Vilardi, J.C. Saidman, B.O. |
| author_facet |
Roser, L.G. Ferreyra, L.I. Ewens, M. Vilardi, J.C. Saidman, B.O. |
| author_sort |
Roser, L.G. |
| title |
Isolation by distance and stochastic migration in a fragmented population of Prosopis alba |
| title_short |
Isolation by distance and stochastic migration in a fragmented population of Prosopis alba |
| title_full |
Isolation by distance and stochastic migration in a fragmented population of Prosopis alba |
| title_fullStr |
Isolation by distance and stochastic migration in a fragmented population of Prosopis alba |
| title_full_unstemmed |
Isolation by distance and stochastic migration in a fragmented population of Prosopis alba |
| title_sort |
isolation by distance and stochastic migration in a fragmented population of prosopis alba |
| url |
http://hdl.handle.net/20.500.12110/paper_00029122_v104_n2_p313_Roser |
| work_keys_str_mv |
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| _version_ |
1807316535301111808 |