01793nas a2200169   4500008004100000245011500041210006900156260000800225300000800233490000700241520126000248653003301508100001601541700001301557700001901570856003401589       2004                        eng d00aSeed fate of two Sapotaceae species in a Guianan rain forest in the context of escape and satiation hypotheses0 aSeed fate of two Sapotaceae species in a Guianan rain forest in   cJan  a1-90 v203 aSeed removal by rodents was investigated for Manilkara huberi and Chrysophyllum lucentifolium in a French Guianan forest. According to the escape hypothesis, seed survival was expected to be greater in populations of low conspecific adult density, while on the contrary, under the satiation hypothesis, it was expected to be greater in populations of high density. The two plots under study showed opposite densities for the two studied tree species. Therefore, according to both hypotheses, seed survival at each plot was expected to be opposite between species. To assess seed fate, seeds were thread-marked in order to relocate them after removal and to determine whether they were consumed or scatterhoarded by rodents. Contrary to what was expected, our results showed that both M. huberi and C. lucentifolium had better survival in the same plot. This suggests that seed fate for both study species was not influenced by the density of conspecific adult trees, but was rather affected by other habitat characteristics, likely the global resource abundance. Variation in seed predation rates of both species seemed largely related to their respective fruiting period, while seatterhoarding rate seemed more affected by intrinsic seed characteristics.10adung beetles forest function1 aChauvet, S.1 aFeer, F.1 aForget, P., M.  u<Go to ISI>://00018895360000102494nas a2200313   4500008004100000245011800041210006900159300001200228490000700240520159500247653001001842653001201852653003101864653001501895653001501910653001201925653001901937653002101956653000901977653002501986653004102011100001302052700001602065700001502081700001902096700001502115700001602130856003402146       2001                        eng d00aRecruitment, a multi-stage process with unpredictable result: the case of a Sapotaceasae in French Guianan forest0 aRecruitment a multistage process with unpredictable result the c  a119-1450 v563 aThe net result of the multi-stage recruitment from seed production to seedling establishment was assessed along 3 consecutive years in Chrysophyllum lucentifolium (Sapotaceae) in a mature rain forest of French Guiana. According to year, between 37 and 42 % of seed production was primarily dispersed away from fruiting trees without damage, especially by primates. Seeds dispersed in howler monkeys' (Alouatta seniculus) defecation were serendipitously buried by dung beetles (14%), eaten by terrestrial vertebrates such as rodents, or destroyed by insects or pathogens. The proportion of seeds secondarily dispersed by scatterhoarding rodents Varied from 3 to 17 % according to year. The survival rate of unremoved and uneaten seeds after 20 days, varied from 2 to 56 % according to year and pattern of spatial distribution generated by primary dispersal (clump or scattered). The empirical model based on the seed and seedling fate diagram showed that, according to years, from 6 to 15 % of produced seeds lead to seedling establishment away from parent tree. Variations in patterns of seed removal and predation by rodents were the most crucial factors governing the effectiveness of primary and secondary dispersers and the spatial distribution of seedlings. Between-year variations of recruitment were important and stochastic because the fluctuations of seed production and seed dispersal/predation varied independently. The proposed empirical model has thus no predictive value. However it can be useful for instance to test the effects of seed size and of some faunal perturbations.10afruit10amonkeys10amonkeys alouatta-seniculus10apopulation10ared howler10arodents10aseed-dispersal10aspatial patterns10atree10atropical rain-forest10avouacapoua-americana caesalpiniaceae1 aFeer, F.1 aJulliot, C.1 aSimmen, B.1 aForget, P., M.1 aBayart, F.1 aChauvet, S.  u<Go to ISI>://000169450800002