The costs of evaluating species densities and composition of snakes to assess development impacts in Amazonia
Autor(a) principal: | |
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Data de Publicação: | 2014 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional do INPA |
Texto Completo: | https://repositorio.inpa.gov.br/handle/1/14707 |
Resumo: | Studies leading to decision-making for environmental licensing often fail to provide accurate estimates of diversity. Measures of snake diversity are regularly obtained to assess development impacts in the rainforests of the Amazon Basin, but this taxonomic group may be subject to poor detection probabilities. Recently, the Brazilian government tried to standardize sampling designs by the implementation of a system (RAPELD) to quantify biological diversity using spatiallystandardized sampling units. Consistency in sampling design allows the detection probabilities to be compared among taxa, and sampling effort and associated cost to be evaluated. The cost effectiveness of detecting snakes has received no attention in Amazonia. Here we tested the effects of reducing sampling effort on estimates of species densities and assemblage composition. We identified snakes in seven plot systems, each standardised with 14 plots. The 250 m long centre line of each plot followed an altitudinal contour. Surveys were repeated four times in each plot and detection probabilities were estimated for the 41 species encountered. Reducing the number of observations, or the size of the sampling modules, caused significant loss of information on species densities and local patterns of variation in assemblage composition. We estimated the cost to find a snake as $ 120 U.S., but general linear models indicated the possibility of identifying differences in assemblage composition for half the overall survey costs. Decisions to reduce sampling effort depend on the importance of lost information to target-issues, and may not be the preferred option if there is the potential for identifying individual snake species requiring specific conservation actions. However, in most studies of human disturbance on species assemblages, it is likely to be more cost-effective to focus on other groups of organisms with higher detection probabilities. © 2014 Fraga et al. |
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Fraga, Rafael deStow, Adam J.Magnusson, William ErnestLima, Albertina Pimental2020-04-24T17:00:37Z2020-04-24T17:00:37Z2014https://repositorio.inpa.gov.br/handle/1/1470710.1371/journal.pone.0105453Studies leading to decision-making for environmental licensing often fail to provide accurate estimates of diversity. Measures of snake diversity are regularly obtained to assess development impacts in the rainforests of the Amazon Basin, but this taxonomic group may be subject to poor detection probabilities. Recently, the Brazilian government tried to standardize sampling designs by the implementation of a system (RAPELD) to quantify biological diversity using spatiallystandardized sampling units. Consistency in sampling design allows the detection probabilities to be compared among taxa, and sampling effort and associated cost to be evaluated. The cost effectiveness of detecting snakes has received no attention in Amazonia. Here we tested the effects of reducing sampling effort on estimates of species densities and assemblage composition. We identified snakes in seven plot systems, each standardised with 14 plots. The 250 m long centre line of each plot followed an altitudinal contour. Surveys were repeated four times in each plot and detection probabilities were estimated for the 41 species encountered. Reducing the number of observations, or the size of the sampling modules, caused significant loss of information on species densities and local patterns of variation in assemblage composition. We estimated the cost to find a snake as $ 120 U.S., but general linear models indicated the possibility of identifying differences in assemblage composition for half the overall survey costs. Decisions to reduce sampling effort depend on the importance of lost information to target-issues, and may not be the preferred option if there is the potential for identifying individual snake species requiring specific conservation actions. However, in most studies of human disturbance on species assemblages, it is likely to be more cost-effective to focus on other groups of organisms with higher detection probabilities. © 2014 Fraga et al.Volume 9, Número 8Attribution-NonCommercial-NoDerivs 3.0 Brazilhttp://creativecommons.org/licenses/by-nc-nd/3.0/br/info:eu-repo/semantics/openAccessBrasilControlled StudyEconomic EvaluationEnvironmental Impact AssessmentEnvironmental MonitoringNonhumanPopulation DensitySample SizeSnakeSpecies CompositionSpecies DifferenceSpecies IdentificationStandardizationTropical Rain ForestAnimalsBiodiversityCostGeographyRainforestAnimalssBiodiversityBrasilCosts And Cost AnalysisGeographyPopulation DensityRainforestSnakesThe costs of evaluating species densities and composition of snakes to assess development impacts in Amazoniainfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlePLoS ONEengreponame:Repositório Institucional do INPAinstname:Instituto Nacional de Pesquisas da Amazônia (INPA)instacron:INPAORIGINALartigo-inpa.pdfapplication/pdf1138372https://repositorio.inpa.gov.br/bitstream/1/14707/1/artigo-inpa.pdf80d9cef6af27d24923644126928ed523MD51CC-LICENSElicense_rdfapplication/octet-stream914https://repositorio.inpa.gov.br/bitstream/1/14707/2/license_rdf4d2950bda3d176f570a9f8b328dfbbefMD521/147072020-07-14 10:15:50.695oai:repositorio:1/14707Repositório de PublicaçõesPUBhttps://repositorio.inpa.gov.br/oai/requestopendoar:2020-07-14T14:15:50Repositório Institucional do INPA - Instituto Nacional de Pesquisas da Amazônia (INPA)false |
dc.title.en.fl_str_mv |
The costs of evaluating species densities and composition of snakes to assess development impacts in Amazonia |
title |
The costs of evaluating species densities and composition of snakes to assess development impacts in Amazonia |
spellingShingle |
The costs of evaluating species densities and composition of snakes to assess development impacts in Amazonia Fraga, Rafael de Brasil Controlled Study Economic Evaluation Environmental Impact Assessment Environmental Monitoring Nonhuman Population Density Sample Size Snake Species Composition Species Difference Species Identification Standardization Tropical Rain Forest Animals Biodiversity Cost Geography Rainforest Animalss Biodiversity Brasil Costs And Cost Analysis Geography Population Density Rainforest Snakes |
title_short |
The costs of evaluating species densities and composition of snakes to assess development impacts in Amazonia |
title_full |
The costs of evaluating species densities and composition of snakes to assess development impacts in Amazonia |
title_fullStr |
The costs of evaluating species densities and composition of snakes to assess development impacts in Amazonia |
title_full_unstemmed |
The costs of evaluating species densities and composition of snakes to assess development impacts in Amazonia |
title_sort |
The costs of evaluating species densities and composition of snakes to assess development impacts in Amazonia |
author |
Fraga, Rafael de |
author_facet |
Fraga, Rafael de Stow, Adam J. Magnusson, William Ernest Lima, Albertina Pimental |
author_role |
author |
author2 |
Stow, Adam J. Magnusson, William Ernest Lima, Albertina Pimental |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Fraga, Rafael de Stow, Adam J. Magnusson, William Ernest Lima, Albertina Pimental |
dc.subject.eng.fl_str_mv |
Brasil Controlled Study Economic Evaluation Environmental Impact Assessment Environmental Monitoring Nonhuman Population Density Sample Size Snake Species Composition Species Difference Species Identification Standardization Tropical Rain Forest Animals Biodiversity Cost Geography Rainforest Animalss Biodiversity Brasil Costs And Cost Analysis Geography Population Density Rainforest Snakes |
topic |
Brasil Controlled Study Economic Evaluation Environmental Impact Assessment Environmental Monitoring Nonhuman Population Density Sample Size Snake Species Composition Species Difference Species Identification Standardization Tropical Rain Forest Animals Biodiversity Cost Geography Rainforest Animalss Biodiversity Brasil Costs And Cost Analysis Geography Population Density Rainforest Snakes |
description |
Studies leading to decision-making for environmental licensing often fail to provide accurate estimates of diversity. Measures of snake diversity are regularly obtained to assess development impacts in the rainforests of the Amazon Basin, but this taxonomic group may be subject to poor detection probabilities. Recently, the Brazilian government tried to standardize sampling designs by the implementation of a system (RAPELD) to quantify biological diversity using spatiallystandardized sampling units. Consistency in sampling design allows the detection probabilities to be compared among taxa, and sampling effort and associated cost to be evaluated. The cost effectiveness of detecting snakes has received no attention in Amazonia. Here we tested the effects of reducing sampling effort on estimates of species densities and assemblage composition. We identified snakes in seven plot systems, each standardised with 14 plots. The 250 m long centre line of each plot followed an altitudinal contour. Surveys were repeated four times in each plot and detection probabilities were estimated for the 41 species encountered. Reducing the number of observations, or the size of the sampling modules, caused significant loss of information on species densities and local patterns of variation in assemblage composition. We estimated the cost to find a snake as $ 120 U.S., but general linear models indicated the possibility of identifying differences in assemblage composition for half the overall survey costs. Decisions to reduce sampling effort depend on the importance of lost information to target-issues, and may not be the preferred option if there is the potential for identifying individual snake species requiring specific conservation actions. However, in most studies of human disturbance on species assemblages, it is likely to be more cost-effective to focus on other groups of organisms with higher detection probabilities. © 2014 Fraga et al. |
publishDate |
2014 |
dc.date.issued.fl_str_mv |
2014 |
dc.date.accessioned.fl_str_mv |
2020-04-24T17:00:37Z |
dc.date.available.fl_str_mv |
2020-04-24T17:00:37Z |
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info:eu-repo/semantics/publishedVersion |
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info:eu-repo/semantics/article |
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article |
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publishedVersion |
dc.identifier.uri.fl_str_mv |
https://repositorio.inpa.gov.br/handle/1/14707 |
dc.identifier.doi.none.fl_str_mv |
10.1371/journal.pone.0105453 |
url |
https://repositorio.inpa.gov.br/handle/1/14707 |
identifier_str_mv |
10.1371/journal.pone.0105453 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Volume 9, Número 8 |
dc.rights.driver.fl_str_mv |
Attribution-NonCommercial-NoDerivs 3.0 Brazil http://creativecommons.org/licenses/by-nc-nd/3.0/br/ info:eu-repo/semantics/openAccess |
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Attribution-NonCommercial-NoDerivs 3.0 Brazil http://creativecommons.org/licenses/by-nc-nd/3.0/br/ |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
PLoS ONE |
publisher.none.fl_str_mv |
PLoS ONE |
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