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• W2111489142 abstract "Abstract. Tropical forests are species-diverse communities, but we know very little about the geographical distribution of genetic diversity within a species. During the late Pleistocene, lower temperatures and rainfall reduced the distribution of tropical wet forests, and in Central America lowland species may have been limited to riparian habitats. Approximately 12,000 years bp, temperature and rainfall increased in Central America, the distribution of wet forest species expanded, and today the distribution of some species extends into southern Mexico. The distribution of genetic diversity, based on RAPD markers, among ten populations of Poulsenia armata (Miq.) Standl. (Moraceae) suggests that these populations did not originate from a single refugium or region in the late Pleistocene. The Central American populations had high genetic diversity and unique bands giving support to the hypothesis that populations of P. armata occurred in Central American during the late Pleistocene. The majority of genetic diversity was partitioned among populations and there was no geographical relationship among populations, suggesting that these populations were isolated for a long period and there has been little gene flow. Populations of P. armata may have persisted in riparian zones along the Caribbean coast during the late Pleistocene. Given that riparian forest can support high levels of biodiversity in ecological time, and they have played an important role during periods of climate change over geological time, their conservation is of utmost importance particularly with the threat of a rapid shift in climatic patterns. Resumen. Los bosques tropicales son comunidades de alta diversidad, a pesar de esto, conocemos muy poco sobre la distribución geográfica de la diversidad genética a nivel de especies. Durante el Pleistoceno tardío, una disminución en temperatura y precipitación restringieron la distribución del bosque húmedo tropical y en Centro América, las especies de tierras bajas pudieron estar limitadas a habitats riparios. Hace aproximadamente 12,000 años se produjo un incremento en temperatura y precipitación en Centro América; la distribución de las especies de bosque húmedo tropical se expandió y en el presente la distribución de algunas especies se extiende hasta el sur de México. La distribución de la diversidad genética a través de diez poblaciones de Poulsenia armata (Moraceae) basada en ‘RAPD’, sugiere que estas poblaciones no se originaron de un solo refugio o región en el Pleistoceno tardío. Las poblaciones de Centro América presentaron alta diversidad genética y un alto número de bandas únicas, sosteniendo la hipótesis de que existieron poblaciones de P. armata en Centro América durante el Pleistoceno tardío. La mayor parte de la diversidad genética ocurrió entre poblaciones y no se encontró relación geográfica entre las diferentes poblaciones, sugeriendo que estas fueron aisladas por largos periodos de tiempo y que ocurrió poco flujo genético entre ellas. Es posible que poblaciones de P. armata se mantuvieron en zonas riparias a lo largo de la costa del Caribe durante el Pleistoceno tardío. Los bosques riparios pueden sostener altos niveles de biodiversidad en un tiempo ecológico y juegan un papel importante durante periodos de cambios climaticos en tiempos geológicos. La conservación de estos habitats riparios es particularmente importante dado a la amenaza de cambios en los patrones climáticos." @default.
• W2111489142 created "2016-06-24" @default.
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• W2111489142 date "1998-07-01" @default.
• W2111489142 modified "2023-09-26" @default.
• W2111489142 title "Geographic patterns of genetic diversity in<i>Poulsenia armata</i>(Moraceae): implications for the theory of Pleistocene refugia and the importance of riparian forest" @default.
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• W2111489142 doi "https://doi.org/10.1046/j.1365-2699.1998.2540695.x" @default.
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