High levels of pollen dispersal detected through paternity analysis from a continuousSymphonia globuliferapopulation in the Brazilian Amazon
In this study, six highly polymorphic microsatellite loci and a categorical paternity analysis approach were used to investigate the contemporary pollen gene flow in the neotropical tree species Symphonia globulifera. Data for this studywere taken from a 500 ha experimental plot in a dense terra firme forest in the Eastern Brazilian Amazon and included the mapping and genotyping of 161 reproductive trees, representing more than 90% of all adult trees, and the collection of 748 open-pollinated seeds from 56 seed-trees over two field seasons (2002 and 2003). High levels of pollen immigration from outside of the study plot were detected in both sampled seed-years suggesting long distance pollen gene flow. Low levels of self-fertilization were also detected. The analysis showed long distance pollen dispersal occurred within the study area in both 2002. Patterns of pollen dispersal distance within the plot were also found to be shorter than the distances between potential male parents and seed-trees. This result indicates that the distance between trees does not explain the identified pollen dispersal pattern. Our results support the hypothesis that animal pollinated species occurring in low-density populations can disperse pollen in long distances, despite the very dense nature of the forest.
Da Silva Carneiro, Francimary / Degen, Bernd / Kanashiro, Milton / et al: High levels of pollen dispersal detected through paternity analysis from a continuousSymphonia globuliferapopulation in the Brazilian Amazon. 2009.
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