Carcass persistence and detectability: reducing the uncertainty surrounding wildlife-vehicle collision surveys

Detalhes bibliográficos
Autor(a) principal: Santos, Rodrigo Augusto Lima
Data de Publicação: 2016
Outros Autores: Santos, Sara M., Reis, Margarida Santos, Figueiredo, Almir Picanço de, Bager, Alex, Aguiar, Ludmilla Moura de Souza, Ascensão, Fernando
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFLA
Texto Completo: http://repositorio.ufla.br/jspui/handle/1/29586
Resumo: Carcass persistence time and detectability are two main sources of uncertainty on roadkill surveys. In this study, we evaluate the influence of these uncertainties on roadkill surveys and estimates. To estimate carcass persistence time, three observers (including the driver) surveyed 114km by car on a monthly basis for two years, searching for wildlife-vehicle collisions (WVC). Each survey consisted of five consecutive days. To estimate carcass detectability, we randomly selected stretches of 500m to be also surveyed on foot by two other observers (total 292 walked stretches, 146 km walked). We expected that body size of the carcass, road type, presence of scavengers and weather conditions to be the main drivers influencing the carcass persistence times, but their relative importance was unknown. We also expected detectability to be highly dependent on body size. Overall, we recorded low median persistence times (one day) and low detectability (<10%) for all vertebrates. The results indicate that body size and landscape cover (as a surrogate of scavengers’ presence) are the major drivers of carcass persistence. Detectability was lower for animals with body mass less than 100g when compared to carcass with higher body mass. We estimated that our recorded mortality rates underestimated actual values of mortality by 2–10 fold. Although persistence times were similar to previous studies, the detectability rates here described are very different from previous studies. The results suggest that detectability is the main source of bias across WVC studies. Therefore, more than persistence times, studies should carefully account for differing detectability when comparing WVC studies.
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spelling Carcass persistence and detectability: reducing the uncertainty surrounding wildlife-vehicle collision surveysRoad ecologyRoad-killWildlife-vehicle collisionsWildlife passageTerrestrial vertebratesCarcassCarcass persistence time and detectability are two main sources of uncertainty on roadkill surveys. In this study, we evaluate the influence of these uncertainties on roadkill surveys and estimates. To estimate carcass persistence time, three observers (including the driver) surveyed 114km by car on a monthly basis for two years, searching for wildlife-vehicle collisions (WVC). Each survey consisted of five consecutive days. To estimate carcass detectability, we randomly selected stretches of 500m to be also surveyed on foot by two other observers (total 292 walked stretches, 146 km walked). We expected that body size of the carcass, road type, presence of scavengers and weather conditions to be the main drivers influencing the carcass persistence times, but their relative importance was unknown. We also expected detectability to be highly dependent on body size. Overall, we recorded low median persistence times (one day) and low detectability (<10%) for all vertebrates. The results indicate that body size and landscape cover (as a surrogate of scavengers’ presence) are the major drivers of carcass persistence. Detectability was lower for animals with body mass less than 100g when compared to carcass with higher body mass. We estimated that our recorded mortality rates underestimated actual values of mortality by 2–10 fold. Although persistence times were similar to previous studies, the detectability rates here described are very different from previous studies. The results suggest that detectability is the main source of bias across WVC studies. Therefore, more than persistence times, studies should carefully account for differing detectability when comparing WVC studies.Plos.org2018-07-09T20:47:00Z2018-07-09T20:47:00Z2016-11-02info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfSANTOS, R. A. L. et al. Carcass persistence and detectability: reducing the uncertainty surrounding wildlife-vehicle collision surveys. PLoS ONE, San Francisco, v. 11, n. 11, Nov. 2016.http://repositorio.ufla.br/jspui/handle/1/29586Plos Onereponame:Repositório Institucional da UFLAinstname:Universidade Federal de Lavras (UFLA)instacron:UFLAhttp://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessSantos, Rodrigo Augusto LimaSantos, Sara M.Reis, Margarida SantosFigueiredo, Almir Picanço deBager, AlexAguiar, Ludmilla Moura de SouzaAscensão, Fernandoeng2018-07-09T20:47:00Zoai:localhost:1/29586Repositório InstitucionalPUBhttp://repositorio.ufla.br/oai/requestnivaldo@ufla.br || repositorio.biblioteca@ufla.bropendoar:2018-07-09T20:47Repositório Institucional da UFLA - Universidade Federal de Lavras (UFLA)false
dc.title.none.fl_str_mv Carcass persistence and detectability: reducing the uncertainty surrounding wildlife-vehicle collision surveys
title Carcass persistence and detectability: reducing the uncertainty surrounding wildlife-vehicle collision surveys
spellingShingle Carcass persistence and detectability: reducing the uncertainty surrounding wildlife-vehicle collision surveys
Santos, Rodrigo Augusto Lima
Road ecology
Road-kill
Wildlife-vehicle collisions
Wildlife passage
Terrestrial vertebrates
Carcass
title_short Carcass persistence and detectability: reducing the uncertainty surrounding wildlife-vehicle collision surveys
title_full Carcass persistence and detectability: reducing the uncertainty surrounding wildlife-vehicle collision surveys
title_fullStr Carcass persistence and detectability: reducing the uncertainty surrounding wildlife-vehicle collision surveys
title_full_unstemmed Carcass persistence and detectability: reducing the uncertainty surrounding wildlife-vehicle collision surveys
title_sort Carcass persistence and detectability: reducing the uncertainty surrounding wildlife-vehicle collision surveys
author Santos, Rodrigo Augusto Lima
author_facet Santos, Rodrigo Augusto Lima
Santos, Sara M.
Reis, Margarida Santos
Figueiredo, Almir Picanço de
Bager, Alex
Aguiar, Ludmilla Moura de Souza
Ascensão, Fernando
author_role author
author2 Santos, Sara M.
Reis, Margarida Santos
Figueiredo, Almir Picanço de
Bager, Alex
Aguiar, Ludmilla Moura de Souza
Ascensão, Fernando
author2_role author
author
author
author
author
author
dc.contributor.author.fl_str_mv Santos, Rodrigo Augusto Lima
Santos, Sara M.
Reis, Margarida Santos
Figueiredo, Almir Picanço de
Bager, Alex
Aguiar, Ludmilla Moura de Souza
Ascensão, Fernando
dc.subject.por.fl_str_mv Road ecology
Road-kill
Wildlife-vehicle collisions
Wildlife passage
Terrestrial vertebrates
Carcass
topic Road ecology
Road-kill
Wildlife-vehicle collisions
Wildlife passage
Terrestrial vertebrates
Carcass
description Carcass persistence time and detectability are two main sources of uncertainty on roadkill surveys. In this study, we evaluate the influence of these uncertainties on roadkill surveys and estimates. To estimate carcass persistence time, three observers (including the driver) surveyed 114km by car on a monthly basis for two years, searching for wildlife-vehicle collisions (WVC). Each survey consisted of five consecutive days. To estimate carcass detectability, we randomly selected stretches of 500m to be also surveyed on foot by two other observers (total 292 walked stretches, 146 km walked). We expected that body size of the carcass, road type, presence of scavengers and weather conditions to be the main drivers influencing the carcass persistence times, but their relative importance was unknown. We also expected detectability to be highly dependent on body size. Overall, we recorded low median persistence times (one day) and low detectability (<10%) for all vertebrates. The results indicate that body size and landscape cover (as a surrogate of scavengers’ presence) are the major drivers of carcass persistence. Detectability was lower for animals with body mass less than 100g when compared to carcass with higher body mass. We estimated that our recorded mortality rates underestimated actual values of mortality by 2–10 fold. Although persistence times were similar to previous studies, the detectability rates here described are very different from previous studies. The results suggest that detectability is the main source of bias across WVC studies. Therefore, more than persistence times, studies should carefully account for differing detectability when comparing WVC studies.
publishDate 2016
dc.date.none.fl_str_mv 2016-11-02
2018-07-09T20:47:00Z
2018-07-09T20:47:00Z
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 SANTOS, R. A. L. et al. Carcass persistence and detectability: reducing the uncertainty surrounding wildlife-vehicle collision surveys. PLoS ONE, San Francisco, v. 11, n. 11, Nov. 2016.
http://repositorio.ufla.br/jspui/handle/1/29586
identifier_str_mv SANTOS, R. A. L. et al. Carcass persistence and detectability: reducing the uncertainty surrounding wildlife-vehicle collision surveys. PLoS ONE, San Francisco, v. 11, n. 11, Nov. 2016.
url http://repositorio.ufla.br/jspui/handle/1/29586
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv http://creativecommons.org/licenses/by/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Plos.org
publisher.none.fl_str_mv Plos.org
dc.source.none.fl_str_mv Plos One
reponame:Repositório Institucional da UFLA
instname:Universidade Federal de Lavras (UFLA)
instacron:UFLA
instname_str Universidade Federal de Lavras (UFLA)
instacron_str UFLA
institution UFLA
reponame_str Repositório Institucional da UFLA
collection Repositório Institucional da UFLA
repository.name.fl_str_mv Repositório Institucional da UFLA - Universidade Federal de Lavras (UFLA)
repository.mail.fl_str_mv nivaldo@ufla.br || repositorio.biblioteca@ufla.br
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