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Carcass Persistence and Detectability: Reducing the Uncertainty Surrounding Wildlife-Vehicle Collision Surveys

Santos, Rodrigo Augusto Lima ; Santos, Sara M ; Santos-Reis, Margarida ; Picanço de Figueiredo, Almir ; Bager, Alex ; Aguiar, Ludmilla M S ; Ascensão, Fernando Lambertucci, Sergio A

PloS one, 2016-11, Vol.11 (11), p.e0165608-e0165608 [Periódico revisado por pares]

United States: Public Library of Science

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Título:
Carcass Persistence and Detectability: Reducing the Uncertainty Surrounding Wildlife-Vehicle Collision Surveys
Autor: Santos, Rodrigo Augusto Lima ; Santos, Sara M ; Santos-Reis, Margarida ; Picanço de Figueiredo, Almir ; Bager, Alex ; Aguiar, Ludmilla M S ; Ascensão, Fernando
Lambertucci, Sergio A
Assuntos: Accidents, Traffic - statistics & numerical data ; Animals ; Animals, Wild ; Biodiversity ; Biology ; Biology and Life Sciences ; Birds ; Body mass ; Body Size ; Cadaver ; Earth Sciences ; Ecology ; Ecology and Environmental Sciences ; Engineering and Technology ; Estimates ; Habitats ; Medicine and Health Sciences ; Mortality ; Observers ; People and Places ; Polls & surveys ; Rain ; Risk Factors ; Roads & highways ; Scavengers ; Surveys ; Surveys and Questionnaires ; Traffic ; Uncertainty ; Vertebrates ; Weather ; Weather conditions ; Wildlife ; Zoology
É parte de: PloS one, 2016-11, Vol.11 (11), p.e0165608-e0165608
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Competing Interests: The authors have declared that no competing interests exist.
Conceptualization: RALS APF SMS FA. Formal analysis: RALS SMS FA. Investigation: RALS APF. Methodology: RALS APF. Project administration: RALS APF FA. Supervision: RALS LMSA MSR FA. Validation: RALS APF. Visualization: RALS SMS FA. Writing – original draft: RALS SMS FA. Writing – review & editing: RALS SMS FA LMSA AB MSR.
Descrição: 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.
Editor: United States: Public Library of Science
Idioma: Inglês

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Carcass Persistence and Detectability: Reducing the Uncertainty Surrounding Wildlife-Vehicle Collision Surveys

Santos, Rodrigo Augusto Lima ; Santos, Sara M ; Santos-Reis, Margarida ; Picanço de Figueiredo, Almir ; Bager, Alex ; Aguiar, Ludmilla M S ; Ascensão, Fernando Lambertucci, Sergio A

United States: Public Library of Science

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