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Spatial distribution of Bertholletia excelsa in selectively logged forests of the Peruvian Amazon

Published online by Cambridge University Press:  09 January 2017

Cara A. Rockwell ,
Manuel R. Guariguata ,
Mary Menton ,
Eriks Arroyo Quispe ,
Julia Quaedvlieg ,
Eleanor Warren-Thomas ,
Harol Fernandez Silva ,
Edwin Eduardo Jurado Rojas ,
José Andrés Hideki Kohagura Arrunátegui  and
Luis Alberto Meza Vega
...Show all authors
Cara A. Rockwell*
Affiliation:
Center for International Forestry Research (CIFOR), Lima, Perú International Center for Tropical Botany, Department of Earth and Environment, Florida International University (FIU), Miami, FL, USA33199
Manuel R. Guariguata
Affiliation:
Center for International Forestry Research (CIFOR), Lima, Perú
Mary Menton
Affiliation:
Center for International Forestry Research (CIFOR), Lima, Perú Solutions & Evidence for Environment & Development (SEED) 106 Cowley Rd, Oxford OX4 1JE, UK
Eriks Arroyo Quispe
Affiliation:
Center for International Forestry Research (CIFOR), Lima, Perú Universidad Nacional Amazónica de Madre de Dios (UNAMAD), Facultad de Ingeniería Forestal y Medio Ambiente, Puerto Maldonado, Madre de Dios, Perú
Julia Quaedvlieg
Affiliation:
Center for International Forestry Research (CIFOR), Lima, Perú
Eleanor Warren-Thomas
Affiliation:
Center for International Forestry Research (CIFOR), Lima, Perú Centre for Ecology, Evolution and Conservation, School of Environmental Sciences, University of East Anglia, Norwich NR4 7TJ, UK
Harol Fernandez Silva
Affiliation:
Center for International Forestry Research (CIFOR), Lima, Perú Universidad Nacional Amazónica de Madre de Dios (UNAMAD), Facultad de Ingeniería Forestal y Medio Ambiente, Puerto Maldonado, Madre de Dios, Perú
Edwin Eduardo Jurado Rojas
Affiliation:
Center for International Forestry Research (CIFOR), Lima, Perú Universidad Nacional Amazónica de Madre de Dios (UNAMAD), Facultad de Ingeniería Forestal y Medio Ambiente, Puerto Maldonado, Madre de Dios, Perú
José Andrés Hideki Kohagura Arrunátegui
Affiliation:
Center for International Forestry Research (CIFOR), Lima, Perú Universidad Nacional Amazónica de Madre de Dios (UNAMAD), Facultad de Ingeniería Forestal y Medio Ambiente, Puerto Maldonado, Madre de Dios, Perú
Luis Alberto Meza Vega
Affiliation:
Center for International Forestry Research (CIFOR), Lima, Perú Universidad Nacional Amazónica de Madre de Dios (UNAMAD), Facultad de Ingeniería Forestal y Medio Ambiente, Puerto Maldonado, Madre de Dios, Perú
Roger Quenta Hancco
Affiliation:
Center for International Forestry Research (CIFOR), Lima, Perú Universidad Nacional Amazónica de Madre de Dios (UNAMAD), Facultad de Ingeniería Forestal y Medio Ambiente, Puerto Maldonado, Madre de Dios, Perú
Olivia Revilla Vera
Affiliation:
Center for International Forestry Research (CIFOR), Lima, Perú Universidad Nacional Amazónica de Madre de Dios (UNAMAD), Facultad de Ingeniería Forestal y Medio Ambiente, Puerto Maldonado, Madre de Dios, Perú
Jonatan Frank Valera Tito
Affiliation:
Center for International Forestry Research (CIFOR), Lima, Perú Universidad Nacional Amazónica de Madre de Dios (UNAMAD), Facultad de Ingeniería Forestal y Medio Ambiente, Puerto Maldonado, Madre de Dios, Perú
Betxy Tabita Villarroel Panduro
Affiliation:
Center for International Forestry Research (CIFOR), Lima, Perú Universidad Nacional Amazónica de Madre de Dios (UNAMAD), Facultad de Ingeniería Forestal y Medio Ambiente, Puerto Maldonado, Madre de Dios, Perú
Juan José Yucra Salas
Affiliation:
Center for International Forestry Research (CIFOR), Lima, Perú Universidad Nacional Amazónica de Madre de Dios (UNAMAD), Facultad de Ingeniería Forestal y Medio Ambiente, Puerto Maldonado, Madre de Dios, Perú
*
*Corresponding author. Email: crockwel@fiu.edu
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Abstract:

To date, the spatial distribution pattern and density of Brazil nut trees in logged forest stands is unclear across the Amazon basin. We asked the following questions: (1) What are the densities and spatial distributions of Brazil nut juveniles (10 ≤ dbh < 40 cm) and adults (≥ 40 cm dbh) in three selectively logged Brazil nut concessions (1413 ha sampled) in Madre de Dios, Peru; (2) What is the spatial relationship between adults and juveniles (10 ≤ dbh < 30 cm); and (3) What is the spatial relationship between juveniles (10 ≤ dbh <30 cm) and cut stumps (≥ 10 y)? Spatial analyses were conducted using statistics derived from Ripley's K function. Juveniles were aggregated in all three concessions. Results for adult populations rejected the null hypothesis of a random distribution among trees ≥ 40 cm dbh. We did not find an attraction between juveniles and cut-stump locations, nor between adults and juveniles. The strong peaks of aggregation for juveniles and adult Brazil nuts in this study occurred at long distances (300–900 m), suggesting multiple tree canopy gaps as drivers of spatial distribution patterns, either via natural or anthropogenic sources. Our data contribute to a more thorough understanding of Brazil nut population structure in disturbed forests in south-western Amazonia.

Keywords

Brazil nutmultiple-use forest managementRipley's Ksmallholderspatial patternstimber extraction
Type
Research Article
Information
Journal of Tropical Ecology , Volume 33 , Issue 2 , March 2017 , pp. 114 - 127
Copyright
Copyright © Cambridge University Press 2017 

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