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Titolo:
POSTDISPERSAL PREDATION AND SCATTERHOARDING OF DIPTERYX-PANAMENSIS (PAPILIONACEAE) SEEDS BY RODENTS IN PANAMA
Autore:
FORGET PM;
Indirizzi:
MUSEUM NATL HIST NAT,ECOL GEN LAB,4 AVE PETIT CHATEAU F-91800 BRUNOY FRANCE SMITHSONIAN TROP RES INST BALBOA PANAMA
Titolo Testata:
Oecologia
fascicolo: 2, volume: 94, anno: 1993,
pagine: 255 - 261
SICI:
0029-8549(1993)94:2<255:PPASOD>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
SCHEELEA PALM SEEDS; POSTDISPERSAL PREDATION; NEOTROPICAL TREE; PARENT PALM; FOREST; SURVIVAL; MAMMALS; RECRUITMENT; DYNAMICS; DISTANCE;
Keywords:
DIPTERYX-PANAMENSIS; DASYPROCTA-PUNCTATA; SCIURUS-GRANATENSIS; POSTDISPERSAL SEED PREDATION; SCATTERHOARDING;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
57
Recensione:
Indirizzi per estratti:
Citazione:
P.M. Forget, "POSTDISPERSAL PREDATION AND SCATTERHOARDING OF DIPTERYX-PANAMENSIS (PAPILIONACEAE) SEEDS BY RODENTS IN PANAMA", Oecologia, 94(2), 1993, pp. 255-261

Abstract

In tropical rain forests of Central America, the canopy tree Dipteryxpanamensis (Papilionaceae) fruits when overall fruit biomass is low for mammals. Flying and arboreal consumers feed on D. panamensis and drop seeds under the parent or disperse them farther away. Seeds on the ground attract many vertebrate seed-eaters, some of them potential secondary seed dispersers. The fate of seeds artificially distributed to simulate bat dispersal was studied in relation to fruitfall periodicity and the visiting frequency of diurnal rodents at Barro Colorado Island (BCI), Panama. The frequency of visits by agoutis is very high at the beginning of fruitfall, but in the area close (< 50 m) to fruiting trees (Dipteryx-rich area) it declines throughout fruiting, whereas itremains unchanged farther (> 50 m) away (Dipteryx-poor and Gustavia-rich area). Squirrels were usually observed in the Dipteryx-rich area. Along with intense post-dispersal seed predation by rodents in the Dipteryx-rich area, a significant proportion of seeds were cached by rodents in the Dipteryx-poor area. Post-dispersal seed predation rate was inversely related to hoarding rate. A significantly greater proportionof seeds was cached in March, especially more than 100 m from the nearest fruiting tree. This correlates with the mid-fruiting period, i.e.during the height of D. panamensis fruiting, when rodents seem to be temporarily satiated with the food supply at parent trees. Hoarding remained high toward April, i.e. late in the fruiting season of D. panamensis. Low survival of scatterhoarded seeds suggests that the alternative food supply over the animal's home-ranges in May June 1990 was toolow to promote survival of cached seeds. Seedlings are assumed to establish in the less-used area of the rodents' home-range when overall food supply is sufficient to satiate post-dispersal predators.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/12/20 alle ore 15:44:36