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The spatial distribution of illegal logging in the Anavilhanas archipelago (Central Amazonia) and logging impacts on species

Published online by Cambridge University Press:  21 December 2011

ANDRESSA BÁRBARA SCABIN ,
FLÁVIA REGINA CAPELLOTTO COSTA  and
JOCHEN SCHÖNGART
ANDRESSA BÁRBARA SCABIN*
Affiliation:
Graduate Program in Ecology, Instituto Nacional de Pesquisas da Amazônia, Avenida Ephigênio Salles 2239, Adrianópolis, Manaus CEP 69011-970, AM, Brazil
FLÁVIA REGINA CAPELLOTTO COSTA
Affiliation:
Coordenação de Pesquisas em Ecologia, Instituto Nacional de Pesquisas da Amazônia, Avenida Ephigênio Salles 2239, Adrianópolis, Manaus CEP 69011-970, AM, Brazil
JOCHEN SCHÖNGART
Affiliation:
Max Planck Institute for Chemistry, Biogeochemistry Department, Johann-Joachim Becherweg 27, Universitatscampus, 55128 Mainz, Germany Projeto Max-Planck, Instituto Nacional de Pesquisas da Amazônia, Avenida André Araújo 1.756, Manaus CEP 69011-910, AM, Brazil
*
*Correspondence: Andressa Bárbara Scabin, current address Avenida três de março 200, Complemento L4, Residencial Vila Azul, Sorocaba, São Paulo CEP 18087-180, Brazil, e-mail: [email protected]
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Summary

Amazonia is one of the world's leading suppliers of timber and the Amazonian timber industry is an important source of regional income, however the economic benefits of this market are associated with environmental damage, mainly when the wood is removed illegally. The Anavilhanas National Park, located in the Brazilian state of Amazonas, has been subjected to illegal logging and elaboration of control programmes requires knowledge of the distribution of timber species and the intensity of logging. This study examines the density and growth rate of the five most harvested tree species in the Park, the spatial distribution of illegal logging operations and their effects on population structure. In total, 2332 trees with diameter at breast height greater than 10 cm, as well as stumps of cut trees, were sampled, and dendrochronology was used to estimate growth rates. Some size classes of Virola surinamensis trees and species within the family Lauraceae decreased in abundance as harvesting intensity increased. Growth rates of the most abundant species of Lauraceae, Ocotea cymbarum, were high, indicating stands may recover quickly when harvesting stops. The population structure of Calophyllum brasiliense showed no negative effects due to logging, but its low growth rate and stand distribution suggest that continued exploitation may endanger these populations. Logging had no detectable negative effects on the size structure of populations of Macrolobium acaciifolium or Hevea spp., and their high growth rates suggest that they will not be threatened by current logging rates. Overall growth rates in the Anavilhanas archipelago are higher than those recorded in other black-water floodplain forest (igapó). Logging of most species (except Lauraceae spp., which have the highest market value) is concentrated in the southern region of the Park, which has more human settlements close by. There was no general relationship between harvesting intensity and geographic distance to human settlements, but there was a tendency for harvesting to be higher in sites with concentrations of trees of high market value. Potential strategies to control illegal logging activities in the Anavilhanas archipelago include encouragement of sustainable logging in Park buffer zones and stimulation of ecotourism initiatives in the southern region of the Park. Ecotourism development can provide an economic alternative to illegal logging for local communities and inhibit logging by increasing vigilance.

Keywords

Amazondendrochronologyflood plainsgrowthtreeshuman pressurepopulation structure
Type
Papers
Information
Environmental Conservation , Volume 39 , Issue 2 , June 2012 , pp. 111 - 121
Copyright
Copyright © Foundation for Environmental Conservation 2011

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