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

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; Luis Alberto Meza Vega; Roger Quenta Hancco; Olivia Revilla Vera; Jonatan Frank Valera Tito; Betxy Tabita Villarroel Panduro; Juan José Yucra Salas

doi:10.1017/S0266467416000614

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

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, Luis Alberto Meza Vega, Roger Quenta Hancco, Olivia Revilla Vera, Jonatan Frank Valera Tito, Betxy Tabita Villarroel Panduro, Juan José Yucra Salas

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

10 Citations (Scopus)

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.

Original language	English
Pages (from-to)	114-127
Number of pages	14
Journal	Journal of Tropical Ecology
Volume	33
Issue number	2
DOIs	https://doi.org/10.1017/S0266467416000614
Publication status	Published - Mar 2017

Keywords

Brazil nut
Multiple-use forest management
Ripley's K
Smallholder
Spatial patterns
Timber extraction

ASJC Scopus subject areas

Ecology, Evolution, Behavior and Systematics

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10.1017/S0266467416000614

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Rockwell, C. A., Guariguata, M. R., Menton, M., Quispe, E. A., Quaedvlieg, J., Warren-Thomas, E., Silva, H. F., Rojas, E. E. J., Arrunátegui, J. A. H. K., Vega, L. A. M., Hancco, R. Q., Vera, O. R., Tito, J. F. V., Panduro, B. T. V., & Salas, J. J. Y. (2017). Spatial distribution of Bertholletia excelsa in selectively logged forests of the Peruvian Amazon. Journal of Tropical Ecology, 33(2), 114-127. https://doi.org/10.1017/S0266467416000614

@article{89b8d885e1bd412983eeb12ef702da14,

title = "Spatial distribution of Bertholletia excelsa in selectively logged forests of the Peruvian Amazon",

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 nut, Multiple-use forest management, Ripley's K, Smallholder, Spatial patterns, Timber extraction",

author = "Rockwell, {Cara A.} and Guariguata, {Manuel R.} and Mary Menton and Quispe, {Eriks Arroyo} and Julia Quaedvlieg and Eleanor Warren-Thomas and Silva, {Harol Fernandez} and Rojas, {Edwin Eduardo Jurado} and Arrun{\'a}tegui, {Jos{\'e} Andr{\'e}s Hideki Kohagura} and Vega, {Luis Alberto Meza} and Hancco, {Roger Quenta} and Vera, {Olivia Revilla} and Tito, {Jonatan Frank Valera} and Panduro, {Betxy Tabita Villarroel} and Salas, {Juan Jos{\'e} Yucra}",

note = "Publisher Copyright: {\textcopyright} 2017 Cambridge University Press.",

year = "2017",

month = mar,

doi = "10.1017/S0266467416000614",

language = "English",

volume = "33",

pages = "114--127",

journal = "Journal of Tropical Ecology",

issn = "0266-4674",

publisher = "Cambridge University Press",

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Rockwell, CA, Guariguata, MR, Menton, M, Quispe, EA, Quaedvlieg, J, Warren-Thomas, E, Silva, HF, Rojas, EEJ, Arrunátegui, JAHK, Vega, LAM, Hancco, RQ, Vera, OR, Tito, JFV, Panduro, BTV & Salas, JJY 2017, 'Spatial distribution of Bertholletia excelsa in selectively logged forests of the Peruvian Amazon', Journal of Tropical Ecology, vol. 33, no. 2, pp. 114-127. https://doi.org/10.1017/S0266467416000614

TY - JOUR

T1 - Spatial distribution of Bertholletia excelsa in selectively logged forests of the Peruvian Amazon

AU - Rockwell, Cara A.

AU - Guariguata, Manuel R.

AU - Menton, Mary

AU - Quispe, Eriks Arroyo

AU - Quaedvlieg, Julia

AU - Warren-Thomas, Eleanor

AU - Silva, Harol Fernandez

AU - Rojas, Edwin Eduardo Jurado

AU - Arrunátegui, José Andrés Hideki Kohagura

AU - Vega, Luis Alberto Meza

AU - Hancco, Roger Quenta

AU - Vera, Olivia Revilla

AU - Tito, Jonatan Frank Valera

AU - Panduro, Betxy Tabita Villarroel

AU - Salas, Juan José Yucra

PY - 2017/3

Y1 - 2017/3

N2 - 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.

AB - 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.

KW - Brazil nut

KW - Multiple-use forest management

KW - Ripley's K

KW - Smallholder

KW - Spatial patterns

KW - Timber extraction

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U2 - 10.1017/S0266467416000614

DO - 10.1017/S0266467416000614

M3 - Article

AN - SCOPUS:85008631570

SN - 0266-4674

VL - 33

SP - 114

EP - 127

JO - Journal of Tropical Ecology

JF - Journal of Tropical Ecology

IS - 2

ER -

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

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Keywords

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