HARDESTY, B.D.; DICK, C.W.; KREMER, Antoine; HUBBELL, S.; BERMINGHAM, Emma

doi:10.1038/sj.hdy.6800714

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HARDESTY, B.D.
Smithsonian Tropical Research Institute
University of Georgia [USA]

DICK, C.W.
Smithsonian Tropical Research Institute
University of Michigan [Ann Arbor]

KREMER, Antoine
Biodiversité, Gènes et Ecosystèmes [BioGeCo]

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Ce document a été publié dans

Heredity. 2005, vol. 95, n° 4, p. 290–297

Nature Publishing Group

Résumé en anglais

Simarouba amara (Simaroubaceae) is a vertebrate-dispersed, insect-pollinated Neotropical tree found in lowland moist forest from upper Mesoamerica to the Amazon basin. We assessed the spatial genetic structure of S. amara within the 50-ha Forest Dynamics Plot on Barro Colorado Island in the Republic of Panama. A total of 300 individuals were genotyped using five microsatellite loci, representing 100 individuals with a dbhgreater than or equal to10 cm, 100 individuals of 1–10 cm dbh, and 100 individuals of <1 cm dbh. The 200 individuals in the two larger size classes were also genotyped with 155 AFLP loci. Spatial autocorrelation analysis using Moran's Index detected significant genotypic association at the smallest distance classes for 1–10 cm dbh (0–20 m) and >10 cm dbh (0–40 m) size categories. Significant spatial autocorrelations were detected over larger scales (0–140 m) in <1 cm dbh individuals. The relatively weak genetic structure of S. amara, in comparison to other recent studies, may be explained by pollen and seed dispersal over the 50 ha plot, overlapping seed shadows, and postrecruitment mortality< Réduire

Mots clés

AFLP

MICROSATELLITES

GENETIQUE DES POPULATIONS

Mots clés en anglais

DISPERSAL

SPATIAL GENETIC STRUCTURE

TROPICAL FOREST