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Titolo:
Seed removal and fate in two selectively logged lowland forests with constrasting protection levels
Autore:
Guariguata, MR; Adame, JJR; Finegan, B;
Indirizzi:
Ctr Agron Trop Invest & Ensenanza, Turrialba 7170, Costa Rica Ctr Agron Trop Invest & Ensenanza Turrialba Costa Rica 7170 , Costa Rica Inst Manatlan Ecol & Conservac Biodivers, Mexico City 48900, DF, Mexico Inst Manatlan Ecol & Conservac Biodivers Mexico City DF Mexico 48900 xico
Titolo Testata:
CONSERVATION BIOLOGY
fascicolo: 4, volume: 14, anno: 2000,
pagine: 1046 - 1054
SICI:
0888-8892(200008)14:4<1046:SRAFIT>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
VOUACAPOUA-AMERICANA CAESALPINIACEAE; TROPICAL FORESTS; RAIN-FOREST; FRENCH-GUIANA; COSTA-RICA; BERTHOLLETIA-EXCELSA; NEOTROPICAL FORESTS; DIPTERYX-PANAMENSIS; LOGGING DAMAGE; DISPERSAL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
62
Recensione:
Indirizzi per estratti:
Indirizzo: Guariguata, MR Ctr Agron Trop Invest & Ensenanza, Turrialba 7170, Costa Rica Ctr Agron Trop Invest & Ensenanza Turrialba Costa Rica 7170
Citazione:
M.R. Guariguata et al., "Seed removal and fate in two selectively logged lowland forests with constrasting protection levels", CONSER BIOL, 14(4), 2000, pp. 1046-1054

Abstract

We evaluated seed removal by terrestrial mammals and the fate of removed, threaded seeds (as a measure of dispersal) in two neighboring tropical rainforest sites in the Caribbean lowlands of Costa Rica. Both sites have beenselectively logged but differ in their degree of protection from human intrusion and habitat connectivity: La Selva is protected from hunting and connected to a national park, whereas Tirimbina remains unprotected and is notconnected to a park. The two study sites are similar in logging intensity,elevation, and canopy tree structure and composition. We predicted that rates of seed removal and seed dispersal would be higher at the connected andprotected site. For seven tree species (six of which are timber species), we determined that patterns of seed removal under an exclusion experiment (semipermeable cages vs. uncaged) varied both within species across sites and within sites across species, suggesting site differences in abundance, degree of animal activity, or presence of particular mammal seed consumers. Rates of seed removal and dispersal were largely species-specific. Most of the study species showed neither site nor treatment effect, whereas others had disproportionately higher removal rates at La Selva. For all species combined (covering a 6-month period due to phenological differences among the study species; n = 920 seeds per site), twice as many removed seeds were dispersed at La Selva (5.3%) than at Tirimbina (2.2%). Only one timber species, Pentaclethra macroloba, did not appear sensitive to site differences in rates of seed removal, most likely because its seeds are toxic to animals. Two timber species, Carapa nicaraguensis and Lecythis ampla, whose seeds are consumed by large scatterhoarding rodents, had 2.5% and 13%, respectively, of their removed seeds dispersed at La Selva, whereas no seeds were dispersed at Tirimbina. In northeastern Costa Rica, where forest cover is fragmented and selective logging is currently underway, the biological sustainability of timber species dispersed by terrestrial mammals may be more likely in sites protected from hunting and/or adjacent to protected areas than in forested patches subjected to hunting.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/12/20 alle ore 15:05:21