Carcass persistence and detectability: reducing the uncertainty surrounding wildlife-vehicle collision surveys
Autor(a) principal: | |
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Data de Publicação: | 2016 |
Outros Autores: | , , , , , |
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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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 |
_version_ |
1815439143488978944 |