Comparing annual vertebrate road kills over two time periods, 9 years apart: a case study in Mediterranean farmland

Detalhes bibliográficos
Autor(a) principal: Carvalho, Filipe
Data de Publicação: 2011
Outros Autores: Mira, António
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10174/3409
https://doi.org/10.1007/s10344-010-0410-0
Resumo: We surveyed road kills occurring along a 26-km stretch of a major national road (Portugal) in two different years: 1996 and 2005. For analysis purposes, we divided the data into seven vertebrate groups: amphibians, reptiles,carnivores, prey mammals (shrews, moles, rodents, rabbits and hares), hedgehogs, owls and passerines. Main factors influencing vertebrate road casualties were evaluated using redundancy analysis and variance partitioning techniques, focusing on three sets of variables: land cover, landscape metrics and spatial location. We also took into account meteorological conditions and changes in traffic intensity specific to each of the surveyed years. The percentage of variance explained by the explanatory variables was greater in 1996 (67.5%) than in 2005 (48.1%). Many variables influencing road kill incidence were common to both years. The most significantly associated factor was the distance to the Natural Park of Serra de São Mamede (NPSSM): road kills decreased steadily as our survey moved south, away from the NPSSM border. Moreover, an increased incidence of road losses occurred in forested areas, such as montado and traditional olive groves. As 2005 was a climatically drier year, additional variance factors became prominent, including the distance to water reservoirs, suggesting a greater influence of water availability. Traffic flow increased by almost 150% from 1996 to 2005, which may explain the overall increase in road kills, with the notable exception of the amphibian group, whose road fatalities incidences decreased approximately sixfold. We expect that our survey will provide a comprehensive understanding of the most critical factors currently influencing vertebrate road fatalities and aid in improving the effectiveness of mitigation measures to reduce them.
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spelling Comparing annual vertebrate road kills over two time periods, 9 years apart: a case study in Mediterranean farmlandMediterranean farmlandRedundancy analysisVariance partitioningVertebratesRoad killsWe surveyed road kills occurring along a 26-km stretch of a major national road (Portugal) in two different years: 1996 and 2005. For analysis purposes, we divided the data into seven vertebrate groups: amphibians, reptiles,carnivores, prey mammals (shrews, moles, rodents, rabbits and hares), hedgehogs, owls and passerines. Main factors influencing vertebrate road casualties were evaluated using redundancy analysis and variance partitioning techniques, focusing on three sets of variables: land cover, landscape metrics and spatial location. We also took into account meteorological conditions and changes in traffic intensity specific to each of the surveyed years. The percentage of variance explained by the explanatory variables was greater in 1996 (67.5%) than in 2005 (48.1%). Many variables influencing road kill incidence were common to both years. The most significantly associated factor was the distance to the Natural Park of Serra de São Mamede (NPSSM): road kills decreased steadily as our survey moved south, away from the NPSSM border. Moreover, an increased incidence of road losses occurred in forested areas, such as montado and traditional olive groves. As 2005 was a climatically drier year, additional variance factors became prominent, including the distance to water reservoirs, suggesting a greater influence of water availability. Traffic flow increased by almost 150% from 1996 to 2005, which may explain the overall increase in road kills, with the notable exception of the amphibian group, whose road fatalities incidences decreased approximately sixfold. We expect that our survey will provide a comprehensive understanding of the most critical factors currently influencing vertebrate road fatalities and aid in improving the effectiveness of mitigation measures to reduce them.Elsevier2012-01-12T11:01:09Z2012-01-122011-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10174/3409http://hdl.handle.net/10174/3409https://doi.org/10.1007/s10344-010-0410-0engCarvalho, F & Mira, A. 2011. Comparing annual vertebrate road kills over two time periods, 9 years apart: a case study in Mediterranean farmland. European Journal of Wildlife Research, 57:157-174ICAAMfilipescpcarvalho@yahoo.comamira@uevora.pt221Carvalho, FilipeMira, Antónioinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-01-03T18:40:32Zoai:dspace.uevora.pt:10174/3409Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T00:58:51.091055Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Comparing annual vertebrate road kills over two time periods, 9 years apart: a case study in Mediterranean farmland
title Comparing annual vertebrate road kills over two time periods, 9 years apart: a case study in Mediterranean farmland
spellingShingle Comparing annual vertebrate road kills over two time periods, 9 years apart: a case study in Mediterranean farmland
Carvalho, Filipe
Mediterranean farmland
Redundancy analysis
Variance partitioning
Vertebrates
Road kills
title_short Comparing annual vertebrate road kills over two time periods, 9 years apart: a case study in Mediterranean farmland
title_full Comparing annual vertebrate road kills over two time periods, 9 years apart: a case study in Mediterranean farmland
title_fullStr Comparing annual vertebrate road kills over two time periods, 9 years apart: a case study in Mediterranean farmland
title_full_unstemmed Comparing annual vertebrate road kills over two time periods, 9 years apart: a case study in Mediterranean farmland
title_sort Comparing annual vertebrate road kills over two time periods, 9 years apart: a case study in Mediterranean farmland
author Carvalho, Filipe
author_facet Carvalho, Filipe
Mira, António
author_role author
author2 Mira, António
author2_role author
dc.contributor.author.fl_str_mv Carvalho, Filipe
Mira, António
dc.subject.por.fl_str_mv Mediterranean farmland
Redundancy analysis
Variance partitioning
Vertebrates
Road kills
topic Mediterranean farmland
Redundancy analysis
Variance partitioning
Vertebrates
Road kills
description We surveyed road kills occurring along a 26-km stretch of a major national road (Portugal) in two different years: 1996 and 2005. For analysis purposes, we divided the data into seven vertebrate groups: amphibians, reptiles,carnivores, prey mammals (shrews, moles, rodents, rabbits and hares), hedgehogs, owls and passerines. Main factors influencing vertebrate road casualties were evaluated using redundancy analysis and variance partitioning techniques, focusing on three sets of variables: land cover, landscape metrics and spatial location. We also took into account meteorological conditions and changes in traffic intensity specific to each of the surveyed years. The percentage of variance explained by the explanatory variables was greater in 1996 (67.5%) than in 2005 (48.1%). Many variables influencing road kill incidence were common to both years. The most significantly associated factor was the distance to the Natural Park of Serra de São Mamede (NPSSM): road kills decreased steadily as our survey moved south, away from the NPSSM border. Moreover, an increased incidence of road losses occurred in forested areas, such as montado and traditional olive groves. As 2005 was a climatically drier year, additional variance factors became prominent, including the distance to water reservoirs, suggesting a greater influence of water availability. Traffic flow increased by almost 150% from 1996 to 2005, which may explain the overall increase in road kills, with the notable exception of the amphibian group, whose road fatalities incidences decreased approximately sixfold. We expect that our survey will provide a comprehensive understanding of the most critical factors currently influencing vertebrate road fatalities and aid in improving the effectiveness of mitigation measures to reduce them.
publishDate 2011
dc.date.none.fl_str_mv 2011-01-01T00:00:00Z
2012-01-12T11:01:09Z
2012-01-12
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://hdl.handle.net/10174/3409
http://hdl.handle.net/10174/3409
https://doi.org/10.1007/s10344-010-0410-0
url http://hdl.handle.net/10174/3409
https://doi.org/10.1007/s10344-010-0410-0
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Carvalho, F & Mira, A. 2011. Comparing annual vertebrate road kills over two time periods, 9 years apart: a case study in Mediterranean farmland. European Journal of Wildlife Research, 57:157-174
ICAAM
filipescpcarvalho@yahoo.com
amira@uevora.pt
221
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
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dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
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instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
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collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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