Population genetic structure of mahogany (Swietenia macrophylla King, Meliaceae) across the Brazilian Amazon, based on variation at microsatellite loci: Implications for conservation
Mahogany (Swietenia macrophylla, Meliaceae) is the most valuable and intensively exploited Neotropical tree. No information is available regarding the genetic structure of mahogany in South America, yet the region harbours most of the unlogged populations of this prized hardwood. Here we report on t...
| Autor principal: | Lemes, Maristerra R. |
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| Outros Autores: | Gribel, Rogério, Proctor, John, Grattapaglia, Dario |
| Grau: | Artigo |
| Idioma: | English |
| Publicado em: |
Molecular Ecology
2020
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| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/18965 |
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oai:repositorio:1-18965 |
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oai:repositorio:1-18965 Population genetic structure of mahogany (Swietenia macrophylla King, Meliaceae) across the Brazilian Amazon, based on variation at microsatellite loci: Implications for conservation Lemes, Maristerra R. Gribel, Rogério Proctor, John Grattapaglia, Dario Brasil Conservation Of Natural Resources Environment Forestry Gene Frequency Genetics, Population Geography Meliaceae Microsatellite Repeats Models, Biological Variation (genetics) Embryophyta Meliaceae Swietenia Swietenia Macrophylla Mahogany (Swietenia macrophylla, Meliaceae) is the most valuable and intensively exploited Neotropical tree. No information is available regarding the genetic structure of mahogany in South America, yet the region harbours most of the unlogged populations of this prized hardwood. Here we report on the genetic diversity within and the differentiation among seven natural populations separated by up to 2100 km along the southern arc of the Brazilian Amazon basin. We analysed the variation at eight microsatellite loci for 194 adult individuals. All loci were highly variable, with the number of alleles per locus ranging from 13 to 27 (mean = 18.4). High levels of genetic diversity were found for all populations at the eight loci (mean HE = 0.781, range 0.754-0.812). We found moderate but statistically significant genetic differentiation among populations considering both estimators of FST and RST, θ = 0.097 and ρ = 0.147, respectively. Estimates of θ and ρ were significantly greater than zero for all pairwise population comparisons. Pairwise ρ-values were positively and significantly correlated with geographical distance under the isolation-by-distance model. Furthermore, four of the populations exhibited a significant inbreeding coefficient. The finding of local differentiation among Amazonian mahogany populations underscores the need for in situ conservation of multiple populations of S. macrophylla across its distribution in the Brazilian Amazon. In addition, the occurrence of microgeographical genetic differentiation at a local scale indicates the importance of maintaining populations in their diverse habitats, especially in areas with mosaics of topography and soil. 2020-06-15T22:04:14Z 2020-06-15T22:04:14Z 2003 Artigo https://repositorio.inpa.gov.br/handle/1/18965 10.1046/j.1365-294X.2003.01950.x en Volume 12, Número 11, Pags. 2875-2883 Restrito Molecular Ecology |
| institution |
Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional |
| collection |
INPA-RI |
| language |
English |
| topic |
Brasil Conservation Of Natural Resources Environment Forestry Gene Frequency Genetics, Population Geography Meliaceae Microsatellite Repeats Models, Biological Variation (genetics) Embryophyta Meliaceae Swietenia Swietenia Macrophylla |
| spellingShingle |
Brasil Conservation Of Natural Resources Environment Forestry Gene Frequency Genetics, Population Geography Meliaceae Microsatellite Repeats Models, Biological Variation (genetics) Embryophyta Meliaceae Swietenia Swietenia Macrophylla Lemes, Maristerra R. Population genetic structure of mahogany (Swietenia macrophylla King, Meliaceae) across the Brazilian Amazon, based on variation at microsatellite loci: Implications for conservation |
| topic_facet |
Brasil Conservation Of Natural Resources Environment Forestry Gene Frequency Genetics, Population Geography Meliaceae Microsatellite Repeats Models, Biological Variation (genetics) Embryophyta Meliaceae Swietenia Swietenia Macrophylla |
| description |
Mahogany (Swietenia macrophylla, Meliaceae) is the most valuable and intensively exploited Neotropical tree. No information is available regarding the genetic structure of mahogany in South America, yet the region harbours most of the unlogged populations of this prized hardwood. Here we report on the genetic diversity within and the differentiation among seven natural populations separated by up to 2100 km along the southern arc of the Brazilian Amazon basin. We analysed the variation at eight microsatellite loci for 194 adult individuals. All loci were highly variable, with the number of alleles per locus ranging from 13 to 27 (mean = 18.4). High levels of genetic diversity were found for all populations at the eight loci (mean HE = 0.781, range 0.754-0.812). We found moderate but statistically significant genetic differentiation among populations considering both estimators of FST and RST, θ = 0.097 and ρ = 0.147, respectively. Estimates of θ and ρ were significantly greater than zero for all pairwise population comparisons. Pairwise ρ-values were positively and significantly correlated with geographical distance under the isolation-by-distance model. Furthermore, four of the populations exhibited a significant inbreeding coefficient. The finding of local differentiation among Amazonian mahogany populations underscores the need for in situ conservation of multiple populations of S. macrophylla across its distribution in the Brazilian Amazon. In addition, the occurrence of microgeographical genetic differentiation at a local scale indicates the importance of maintaining populations in their diverse habitats, especially in areas with mosaics of topography and soil. |
| format |
Artigo |
| author |
Lemes, Maristerra R. |
| author2 |
Gribel, Rogério Proctor, John Grattapaglia, Dario |
| author2Str |
Gribel, Rogério Proctor, John Grattapaglia, Dario |
| title |
Population genetic structure of mahogany (Swietenia macrophylla King, Meliaceae) across the Brazilian Amazon, based on variation at microsatellite loci: Implications for conservation |
| title_short |
Population genetic structure of mahogany (Swietenia macrophylla King, Meliaceae) across the Brazilian Amazon, based on variation at microsatellite loci: Implications for conservation |
| title_full |
Population genetic structure of mahogany (Swietenia macrophylla King, Meliaceae) across the Brazilian Amazon, based on variation at microsatellite loci: Implications for conservation |
| title_fullStr |
Population genetic structure of mahogany (Swietenia macrophylla King, Meliaceae) across the Brazilian Amazon, based on variation at microsatellite loci: Implications for conservation |
| title_full_unstemmed |
Population genetic structure of mahogany (Swietenia macrophylla King, Meliaceae) across the Brazilian Amazon, based on variation at microsatellite loci: Implications for conservation |
| title_sort |
population genetic structure of mahogany (swietenia macrophylla king, meliaceae) across the brazilian amazon, based on variation at microsatellite loci: implications for conservation |
| publisher |
Molecular Ecology |
| publishDate |
2020 |
| url |
https://repositorio.inpa.gov.br/handle/1/18965 |
| _version_ |
1787144909460865024 |
| score |
11.755432 |