TY  - JOUR
AU  - Latouche-Halle, C.
AU  - Ramboer, A.
AU  - Bandou, E.
AU  - Caron, H.
AU  - Kremer, A.
PY  - 2004//
TI  - Long-distance pollen flow and tolerance to selfing in a neotropical tree species
T2  - Mol. Ecol.
JO  - Molecular Ecology
SP  - 1055
EP  - 1064
VL  - 13
IS  - 5
PB  - BLACKWELL PUBLISHING LTD
KW  - Dicorynia guianensis
KW  - microsatellites
KW  - outcrossing rate
KW  - pollen flow
KW  - reproductive success
KW  - tropical tree
N2  - Outcrossing rates, pollen dispersal and male mating success were assessed in Dicorynia guianensis Amshoff, a neotropical tree endemic to the Guiana shield. All adult trees within a continuous area of 40 ha (n = 157) were mapped, and were genotyped with six microsatellite loci. In addition, progenies were genotyped from 22 mature trees. At the population level, the species was mostly outcrossing (t(m) = 0.89) but there was marked variation among individuals. One tree exhibited mixed mating, confirming earlier results obtained with isozymes that D. guianensis can tolerate selfing. A Bayesian extension of the fractional paternity method was used for paternity analysis, and was compared with the neighbourhood method used widely for forest trees. Both methods indicated that pollen dispersal was only weakly related to distance between trees within the study area, and that the majority (62%) of pollen came from outside the study stand. Using maximum likelihood, male potential population size was estimated to be 1119, corresponding to a neighbourhood size of 560 hectares. Male mating success was, however, related to the diameter of the stem and to flowering intensity assessed visually. The mating behaviour of D. guianensis is a combination of long-distance pollen flow and occasional selfing. The species can still reproduce when it is extremely rare, either by selfing or by dispersing pollen at long distances. These results, together with the observation that male mating success was correlated with the size of the trees, could be implemented in management procedures aiming at regenerating the species.
SN  - 0962-1083
N1  - ISI:000221016300007
ID  - Latouche-Halle_etal2004
ER  -