Demographic threats to the sustainability of Brazil nut exploitation.
Science
; 302(5653): 2112-4, 2003 Dec 19.
Article
em En
| MEDLINE
| ID: mdl-14684819
ABSTRACT
A comparative analysis of 23 populations of the Brazil nut tree (Bertholletia excelsa) across the Brazilian, Peruvian, and Bolivian Amazon shows that the history and intensity of Brazil nut exploitation are major determinants of population size structure. Populations subjected to persistent levels of harvest lack juvenile trees less than 60 centimeters in diameter at breast height; only populations with a history of either light or recent exploitation contain large numbers of juvenile trees. A harvesting model confirms that intensive exploitation levels over the past century are such that juvenile recruitment is insufficient to maintain populations over the long term. Without management, intensively harvested populations will succumb to a process of senescence and demographic collapse, threatening this cornerstone of the Amazonian extractive economy.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Árvores
/
Ecossistema
/
Produtos Agrícolas
/
Bertholletia
/
Nozes
Tipo de estudo:
Diagnostic_studies
/
Prognostic_studies
/
Risk_factors_studies
País/Região como assunto:
America do sul
/
Bolivia
/
Brasil
/
Peru
Idioma:
En
Ano de publicação:
2003
Tipo de documento:
Article