Visual encounters on line transect surveys under-detect carnivore species: Implications for assessing distribution and conservation status
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1371/journal.pone.0223922 http://hdl.handle.net/11449/194965 |
Resumo: | We compared the distribution and occurrence of 15 carnivore species with data collected monthly over three years by trained native trackers using both sign surveys and an encounter-based, visual-distance method in a well-preserved region of southern Guyana (Amazon / Guiana Shield). We found that a rigorously applied sign-based method was sufficient to describe the status of most carnivore species populations, including rare species such as jaguar and bush dog. We also found that even when accumulation curves for direct visual encounter data reached an asymptote, customarily an indication that sufficient sampling has occurred to describe populations, animal occurrence and distribution were grossly underestimated relative to the results of sign data. While other researchers have also found that sign are better than encounters or camera traps for large felids, our results are important in documenting the failure of even intensive levels of effort to raise encounter rates sufficiently to enable statistical analysis, and in describing the relationship between encounter and sign data for an entire community of carnivores including felids, canids, procyonids, and mustelids. |
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Repositório Institucional da UNESP |
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spelling |
Visual encounters on line transect surveys under-detect carnivore species: Implications for assessing distribution and conservation statusWe compared the distribution and occurrence of 15 carnivore species with data collected monthly over three years by trained native trackers using both sign surveys and an encounter-based, visual-distance method in a well-preserved region of southern Guyana (Amazon / Guiana Shield). We found that a rigorously applied sign-based method was sufficient to describe the status of most carnivore species populations, including rare species such as jaguar and bush dog. We also found that even when accumulation curves for direct visual encounter data reached an asymptote, customarily an indication that sufficient sampling has occurred to describe populations, animal occurrence and distribution were grossly underestimated relative to the results of sign data. While other researchers have also found that sign are better than encounters or camera traps for large felids, our results are important in documenting the failure of even intensive levels of effort to raise encounter rates sufficiently to enable statistical analysis, and in describing the relationship between encounter and sign data for an entire community of carnivores including felids, canids, procyonids, and mustelids.National Science FoundationGordon and Betty Moore FoundationConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Stanford UniversityFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Stanford Univ, Stanford, CA 94305 USAUniv Fed Rio de Janeiro, Museu Nacl, Dept Vertebrados, Rio de Janeiro, RJ, BrazilSUNY Coll Environm Sci & Forestry, Environm & Forest Biol, Syracuse, NY 13210 USAOregon State Univ, Dept Fisheries & Wildlife, Corvallis, OR 97331 USAVirginia Tech, Dept Forest Resources & Environm Conservat, Blacksburg, VA USACalif Acad Sci, Inst Biodivers Sci & Sustainabil, San Francisco, CA 94118 USAInst Nacl Pesquisas Amazonia INPA MCTIC, Manaus, Amazonas, BrazilUniv Brasilia, Inst Ciencias Biol, Brasilia, DF, BrazilUniv Estadual Paulista, Dept Ecol, Inst Biociencias, Lab Biol Conservacao LaBiC, Sao Paulo, BrazilUniv Cambridge, Dept Zool, Conservat Sci Grp, Cambridge, EnglandUniv Estadual Paulista, Dept Ecol, Inst Biociencias, Lab Biol Conservacao LaBiC, Sao Paulo, BrazilNational Science Foundation: BE/CNH 0508094Gordon and Betty Moore Foundation: 2054.01CNPq: 202214/2015-0Stanford University: 51211805202FAPESP: 2017/24252-0FAPESP: 2019/00648-7Public Library ScienceStanford UnivUniversidade Federal do Rio de Janeiro (UFRJ)SUNY Coll Environm Sci & ForestryOregon State UnivVirginia TechCalif Acad SciInst Nacl Pesquisas Amazonia INPA MCTICUniversidade de Brasília (UnB)Universidade Estadual Paulista (Unesp)Univ CambridgeFragoso, Jose M. V.Goncalves, Fernando [UNESP]Oliveira, Luiz F. B.Overman, HanLevi, TaalSilvius, Kirsten M.2020-12-10T17:00:07Z2020-12-10T17:00:07Z2019-10-30info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article17http://dx.doi.org/10.1371/journal.pone.0223922Plos One. San Francisco: Public Library Science, v. 14, n. 10, 17 p., 2019.1932-6203http://hdl.handle.net/11449/19496510.1371/journal.pone.0223922WOS:000495703800001Web of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengPlos Oneinfo:eu-repo/semantics/openAccess2021-10-23T03:03:59Zoai:repositorio.unesp.br:11449/194965Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462021-10-23T03:03:59Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Visual encounters on line transect surveys under-detect carnivore species: Implications for assessing distribution and conservation status |
title |
Visual encounters on line transect surveys under-detect carnivore species: Implications for assessing distribution and conservation status |
spellingShingle |
Visual encounters on line transect surveys under-detect carnivore species: Implications for assessing distribution and conservation status Fragoso, Jose M. V. |
title_short |
Visual encounters on line transect surveys under-detect carnivore species: Implications for assessing distribution and conservation status |
title_full |
Visual encounters on line transect surveys under-detect carnivore species: Implications for assessing distribution and conservation status |
title_fullStr |
Visual encounters on line transect surveys under-detect carnivore species: Implications for assessing distribution and conservation status |
title_full_unstemmed |
Visual encounters on line transect surveys under-detect carnivore species: Implications for assessing distribution and conservation status |
title_sort |
Visual encounters on line transect surveys under-detect carnivore species: Implications for assessing distribution and conservation status |
author |
Fragoso, Jose M. V. |
author_facet |
Fragoso, Jose M. V. Goncalves, Fernando [UNESP] Oliveira, Luiz F. B. Overman, Han Levi, Taal Silvius, Kirsten M. |
author_role |
author |
author2 |
Goncalves, Fernando [UNESP] Oliveira, Luiz F. B. Overman, Han Levi, Taal Silvius, Kirsten M. |
author2_role |
author author author author author |
dc.contributor.none.fl_str_mv |
Stanford Univ Universidade Federal do Rio de Janeiro (UFRJ) SUNY Coll Environm Sci & Forestry Oregon State Univ Virginia Tech Calif Acad Sci Inst Nacl Pesquisas Amazonia INPA MCTIC Universidade de Brasília (UnB) Universidade Estadual Paulista (Unesp) Univ Cambridge |
dc.contributor.author.fl_str_mv |
Fragoso, Jose M. V. Goncalves, Fernando [UNESP] Oliveira, Luiz F. B. Overman, Han Levi, Taal Silvius, Kirsten M. |
description |
We compared the distribution and occurrence of 15 carnivore species with data collected monthly over three years by trained native trackers using both sign surveys and an encounter-based, visual-distance method in a well-preserved region of southern Guyana (Amazon / Guiana Shield). We found that a rigorously applied sign-based method was sufficient to describe the status of most carnivore species populations, including rare species such as jaguar and bush dog. We also found that even when accumulation curves for direct visual encounter data reached an asymptote, customarily an indication that sufficient sampling has occurred to describe populations, animal occurrence and distribution were grossly underestimated relative to the results of sign data. While other researchers have also found that sign are better than encounters or camera traps for large felids, our results are important in documenting the failure of even intensive levels of effort to raise encounter rates sufficiently to enable statistical analysis, and in describing the relationship between encounter and sign data for an entire community of carnivores including felids, canids, procyonids, and mustelids. |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019-10-30 2020-12-10T17:00:07Z 2020-12-10T17:00:07Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1371/journal.pone.0223922 Plos One. San Francisco: Public Library Science, v. 14, n. 10, 17 p., 2019. 1932-6203 http://hdl.handle.net/11449/194965 10.1371/journal.pone.0223922 WOS:000495703800001 |
url |
http://dx.doi.org/10.1371/journal.pone.0223922 http://hdl.handle.net/11449/194965 |
identifier_str_mv |
Plos One. San Francisco: Public Library Science, v. 14, n. 10, 17 p., 2019. 1932-6203 10.1371/journal.pone.0223922 WOS:000495703800001 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Plos One |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
17 |
dc.publisher.none.fl_str_mv |
Public Library Science |
publisher.none.fl_str_mv |
Public Library Science |
dc.source.none.fl_str_mv |
Web of Science reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1797789883260993536 |