TY  - JOUR
AU  - Charles-Dominique, P.
AU  - Chave, J.
AU  - Dubois, M.A.
AU  - De Granville, J.J.
AU  - Riera, B.
AU  - Vezzoli, C.
PY  - 2003//
TI  - Colonization front of the understorey palm Astrocaryum sciophilum in a pristine rain forest of French Guiana
T2  - Glob. Ecol. Biogeogr.
JO  - Global Ecology and Biogeography
SP  - 237
EP  - 248
VL  - 12
IS  - 3
PB  - BLACKWELL PUBLISHING LTD
KW  - Astrocaryum sciophilum
KW  - French Guiana
KW  - neotropical palaeoecology
KW  - palm ecology
KW  - population edge
KW  - refuges
KW  - scatter-hoarding
KW  - seed dispersal
KW  - spatial pattern
N2  - Aims Astrocaryum sciophilum (Miq.) Pulle (Arecaceae) is an understorey palm, endemic to north-eastern South America with a patchy distribution. We tested the hypothesis that the spatial distribution of this palm species is not in equilibrium but is slowly colonizing the forest understorey. Location Inventories and seed dispersal studies were conducted in the undisturbed tropical forest close to the Nouragues research station, French Guiana. Additional data were collected in the entire territory of French Guiana. Methods We studied the demography of A. sciophilum on a 20-ha plot located at the edge of its distribution. The age of the palms was estimated by postulating an exponentially decreasing abundance by age class. Direct seed dispersal experiments were also conducted, to estimate dispersal parameters. The seeds of A. sciophilum were dispersed only by rodents. This information was used to parameterize a forest growth simulator, to study the spatial spread of this species. Results Within the sampling plot, the density of A. sciophilum dropped sharply from about 500 individuals per hectare to zero. The maturation age was estimated to be 170+/-70 years, and over 55 years with 95% confidence. Seed-dispersal experiments yielded an average seed dispersal distance of 11 m and a maximum estimated dispersal distance of 125 m across a generational span of 55 years to maturity. Therefore, the maximal estimated colonization speed is 2.3 m/y. Conclusions Empirical results and numerical simulations suggest that the boundary of the A. sciophilum population is a colonization front, and that the range of this species is slowly expanding. The implications of this result in respect of palaeoenvironmental changes in this region are discussed.
SN  - 0960-7447
N1  - ISI:000182184100006
ID  - Charles-Dominique_etal2003
ER  -