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Víctor Castelazo-calva - One of the best experts on this subject based on the ideXlab platform.
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Conservation implications for jaguars and other neotropical mammals using highway Underpasses
PloS one, 2018Co-Authors: Alberto González-gallina, Mircea G. Hidalgo-mihart, Víctor Castelazo-calvaAbstract:The Nuevo Xcan-Playa del Carmen highway in Quintana Roo, bisects the vegetation corridor connecting two Jaguar Conservation Units (JCUs): Yum Balaam (north) and Sian Ka´an (south). The project´s main goal was to describe differential use of available crossing structures (wildlife Underpasses and culverts) by mammals present along this highway. We set 28 camera traps along the 54km stretch of the highway covering wildlife Underpasses (10), and culverts such as box culverts (9) and pipes (9) from September 2016 until March 2017. A total of 24 jaguar crossings have been recorded exclusively using wildlife Underpasses, including four males and two females. At least 18 other mammal species including five of the target priority species (protected by Mexican law) were documented, all of which were native except for two invasive species. In terms of species using the crossing structures, we identified 13 species using wildlife Underpasses, nine using concrete box culverts and 10 using concrete pipes. Wildlife Underpasses show higher diversity values (Shannon´s exponential index = 5.8 and Inverse Simpson´s index = 4.66) compared to culverts because they allow bigger species to cross. We recommend more highways along the jaguar´s distribution should develop mitigation measures to allow for wildlife connectivity. Wildlife Underpasses, along with retrofitted culverts, could help secure not only the permanence of this species by facilitating the functional connectivity between populations but have positive impacts on other neotropical mammalian fauna as well.
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Photographs from priority species of mammals using wildlife Underpasses.
2018Co-Authors: Alberto González-gallina, Mircea G. Hidalgo-mihart, Víctor Castelazo-calvaAbstract:Priority species considered as Endangered (P) according to Mexican law (NOM-059-SEMARNAT-2010). A) Jaguars (Panthera onca) using two different stations, 1) female and 2) male. B) Ocelot (Leopardus pardalis) and C) Tayra (Eira barbara).
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Terrestrial mammal diversity profile for the different crossing structures along the Nuevo Xcan- Playa del Carmen highway.
2018Co-Authors: Alberto González-gallina, Mircea G. Hidalgo-mihart, Víctor Castelazo-calvaAbstract:All crossing structures: wildlife Underpasses, box culverts and concrete pipes and culverts together. True diversity indexes (qD) for all levels 0D (species richness), 1D (Shannon´s exponential) and 2D (Inverse Simpson).
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Individual station diversity values per structure type.
2018Co-Authors: Alberto González-gallina, Mircea G. Hidalgo-mihart, Víctor Castelazo-calvaAbstract:All crossing structures: wildlife Underpasses, box culverts, concrete pipes and both culverts grouped, showing True diversity indexes (qD) for all levels 0D (species richness), 1D (Shannon´s exponential) and 2D (Inverse Simpson). Mean appears as a line dividing the box, whiskers represent 95% confidence interval. Outlier values are shown as circles.
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Crossing structure types build along the Nuevo Xcan- Playa del Carmen highway in Quintana Roo, Mexico.
2018Co-Authors: Alberto González-gallina, Mircea G. Hidalgo-mihart, Víctor Castelazo-calvaAbstract:A.- Wildlife Underpasses (3 m span x 4.5m rise, equipped with induction fences, natural soil, and without barb wires delimiting the right of way). B.- Box culverts (2 m span x 1 m rise). C.- Concrete pipes (circular ducts with a diameter of 1.8 m). The box culverts and the concrete pipes were not built with specific mitigation measures for wildlife crossing.
Alberto González-gallina - One of the best experts on this subject based on the ideXlab platform.
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Conservation implications for jaguars and other neotropical mammals using highway Underpasses
PloS one, 2018Co-Authors: Alberto González-gallina, Mircea G. Hidalgo-mihart, Víctor Castelazo-calvaAbstract:The Nuevo Xcan-Playa del Carmen highway in Quintana Roo, bisects the vegetation corridor connecting two Jaguar Conservation Units (JCUs): Yum Balaam (north) and Sian Ka´an (south). The project´s main goal was to describe differential use of available crossing structures (wildlife Underpasses and culverts) by mammals present along this highway. We set 28 camera traps along the 54km stretch of the highway covering wildlife Underpasses (10), and culverts such as box culverts (9) and pipes (9) from September 2016 until March 2017. A total of 24 jaguar crossings have been recorded exclusively using wildlife Underpasses, including four males and two females. At least 18 other mammal species including five of the target priority species (protected by Mexican law) were documented, all of which were native except for two invasive species. In terms of species using the crossing structures, we identified 13 species using wildlife Underpasses, nine using concrete box culverts and 10 using concrete pipes. Wildlife Underpasses show higher diversity values (Shannon´s exponential index = 5.8 and Inverse Simpson´s index = 4.66) compared to culverts because they allow bigger species to cross. We recommend more highways along the jaguar´s distribution should develop mitigation measures to allow for wildlife connectivity. Wildlife Underpasses, along with retrofitted culverts, could help secure not only the permanence of this species by facilitating the functional connectivity between populations but have positive impacts on other neotropical mammalian fauna as well.
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Photographs from priority species of mammals using wildlife Underpasses.
2018Co-Authors: Alberto González-gallina, Mircea G. Hidalgo-mihart, Víctor Castelazo-calvaAbstract:Priority species considered as Endangered (P) according to Mexican law (NOM-059-SEMARNAT-2010). A) Jaguars (Panthera onca) using two different stations, 1) female and 2) male. B) Ocelot (Leopardus pardalis) and C) Tayra (Eira barbara).
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Terrestrial mammal diversity profile for the different crossing structures along the Nuevo Xcan- Playa del Carmen highway.
2018Co-Authors: Alberto González-gallina, Mircea G. Hidalgo-mihart, Víctor Castelazo-calvaAbstract:All crossing structures: wildlife Underpasses, box culverts and concrete pipes and culverts together. True diversity indexes (qD) for all levels 0D (species richness), 1D (Shannon´s exponential) and 2D (Inverse Simpson).
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Individual station diversity values per structure type.
2018Co-Authors: Alberto González-gallina, Mircea G. Hidalgo-mihart, Víctor Castelazo-calvaAbstract:All crossing structures: wildlife Underpasses, box culverts, concrete pipes and both culverts grouped, showing True diversity indexes (qD) for all levels 0D (species richness), 1D (Shannon´s exponential) and 2D (Inverse Simpson). Mean appears as a line dividing the box, whiskers represent 95% confidence interval. Outlier values are shown as circles.
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Crossing structure types build along the Nuevo Xcan- Playa del Carmen highway in Quintana Roo, Mexico.
2018Co-Authors: Alberto González-gallina, Mircea G. Hidalgo-mihart, Víctor Castelazo-calvaAbstract:A.- Wildlife Underpasses (3 m span x 4.5m rise, equipped with induction fences, natural soil, and without barb wires delimiting the right of way). B.- Box culverts (2 m span x 1 m rise). C.- Concrete pipes (circular ducts with a diameter of 1.8 m). The box culverts and the concrete pipes were not built with specific mitigation measures for wildlife crossing.
Mircea G. Hidalgo-mihart - One of the best experts on this subject based on the ideXlab platform.
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Conservation implications for jaguars and other neotropical mammals using highway Underpasses
PloS one, 2018Co-Authors: Alberto González-gallina, Mircea G. Hidalgo-mihart, Víctor Castelazo-calvaAbstract:The Nuevo Xcan-Playa del Carmen highway in Quintana Roo, bisects the vegetation corridor connecting two Jaguar Conservation Units (JCUs): Yum Balaam (north) and Sian Ka´an (south). The project´s main goal was to describe differential use of available crossing structures (wildlife Underpasses and culverts) by mammals present along this highway. We set 28 camera traps along the 54km stretch of the highway covering wildlife Underpasses (10), and culverts such as box culverts (9) and pipes (9) from September 2016 until March 2017. A total of 24 jaguar crossings have been recorded exclusively using wildlife Underpasses, including four males and two females. At least 18 other mammal species including five of the target priority species (protected by Mexican law) were documented, all of which were native except for two invasive species. In terms of species using the crossing structures, we identified 13 species using wildlife Underpasses, nine using concrete box culverts and 10 using concrete pipes. Wildlife Underpasses show higher diversity values (Shannon´s exponential index = 5.8 and Inverse Simpson´s index = 4.66) compared to culverts because they allow bigger species to cross. We recommend more highways along the jaguar´s distribution should develop mitigation measures to allow for wildlife connectivity. Wildlife Underpasses, along with retrofitted culverts, could help secure not only the permanence of this species by facilitating the functional connectivity between populations but have positive impacts on other neotropical mammalian fauna as well.
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Photographs from priority species of mammals using wildlife Underpasses.
2018Co-Authors: Alberto González-gallina, Mircea G. Hidalgo-mihart, Víctor Castelazo-calvaAbstract:Priority species considered as Endangered (P) according to Mexican law (NOM-059-SEMARNAT-2010). A) Jaguars (Panthera onca) using two different stations, 1) female and 2) male. B) Ocelot (Leopardus pardalis) and C) Tayra (Eira barbara).
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Terrestrial mammal diversity profile for the different crossing structures along the Nuevo Xcan- Playa del Carmen highway.
2018Co-Authors: Alberto González-gallina, Mircea G. Hidalgo-mihart, Víctor Castelazo-calvaAbstract:All crossing structures: wildlife Underpasses, box culverts and concrete pipes and culverts together. True diversity indexes (qD) for all levels 0D (species richness), 1D (Shannon´s exponential) and 2D (Inverse Simpson).
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Individual station diversity values per structure type.
2018Co-Authors: Alberto González-gallina, Mircea G. Hidalgo-mihart, Víctor Castelazo-calvaAbstract:All crossing structures: wildlife Underpasses, box culverts, concrete pipes and both culverts grouped, showing True diversity indexes (qD) for all levels 0D (species richness), 1D (Shannon´s exponential) and 2D (Inverse Simpson). Mean appears as a line dividing the box, whiskers represent 95% confidence interval. Outlier values are shown as circles.
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Crossing structure types build along the Nuevo Xcan- Playa del Carmen highway in Quintana Roo, Mexico.
2018Co-Authors: Alberto González-gallina, Mircea G. Hidalgo-mihart, Víctor Castelazo-calvaAbstract:A.- Wildlife Underpasses (3 m span x 4.5m rise, equipped with induction fences, natural soil, and without barb wires delimiting the right of way). B.- Box culverts (2 m span x 1 m rise). C.- Concrete pipes (circular ducts with a diameter of 1.8 m). The box culverts and the concrete pipes were not built with specific mitigation measures for wildlife crossing.
Milton Cezar Ribeiro - One of the best experts on this subject based on the ideXlab platform.
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Highway widening and underpass effects on vertebrate road mortality
Biotropica, 2017Co-Authors: Giordano Ciocheti, Julia Camara Assis, John Wesley Ribeiro, Milton Cezar RibeiroAbstract:Road widening (a.k.a. road dualling) and the presence of mitigation structures may have opposing effects on the number of animal-vehicle collisions. Their influence in tropical areas is poorly quantified, and we know little about how modifications of road structure affect fauna roadkill and mitigation. We evaluated how road widening and proximity to a wildlife underpass affect roadkill of medium and large mammals, using roadkill records from before and after the widening of 150 km of road with new and old wildlife Underpasses. Roadkilled species were divided into three groups based on mobility and sensitivity to human disturbance. Four of 16 species exhibited significantly higher roadkill after widening. Roadkill near Underpasses was generally higher than by chance, despite our expectation of reduction in roadkills. This result indicates that we must adopt more effective mitigation measures, such as appropriate fencing combined with Underpasses.
Bridget M Donaldson - One of the best experts on this subject based on the ideXlab platform.
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use of highway Underpasses by large mammals and other wildlife in virginia factors influencing their effectiveness
Transportation Research Record, 2007Co-Authors: Bridget M DonaldsonAbstract:Wildlife crossing structures are gaining recognition by transportation agencies as effective measures to reduce animal-vehicle collisions and to connect wildlife habitats across transportation corridors. For the species that pose the highest risk in terms of animal-vehicle accidents in Virginia, namely, white-tailed deer and black bears, research is lacking on structural and location attributes of effective crossing structures. The Virginia Transportation Research Council began a 1-year study in June 2004 to monitor potential crossing structures and to determine the features that make a crossing successful for Virginia's large mammals. The Underpasses, most not specifically designed as wildlife crossings, consist of box culverts and bridges of varying sizes. Remote cameras installed at seven underpass sites have recorded more than 2,700 wildlife photographs and documented 1,040 white-tailed deer crossings in the most heavily used structures. Underpasses with a minimum height of 12 ft were successful in fa...
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use of highway Underpasses by large mammals and other wildlife in virginia and factors influencingtheir effectiveness
2005 International Conference on Ecology and Transportation (ICOET 2005)Federal Highway AdministrationUSDA Forest ServiceU.S. Fish and Wildlife Servic, 2005Co-Authors: Bridget M DonaldsonAbstract:The rapid increase in animal-vehicle collisions on U.S. roadways is a growing concern in terms of human safety, property damage and injury costs, and viability of wildlife populations. Wildlife crossing structures are gaining national recognition by transportation agencies as effective measures to reduce animal-vehicle collisions and connect wildlife habitats across transportation corridors. In Virginia, white-tailed deer and black bear pose the highest risk. This one-year study was conducted to monitor various underpass structures in Virginia to determine the structural and location attributes that make a crossing successful in terms of use by large mammals. The Underpasses, most of which were not specifically designed as wildlife crossings, consist of box culverts and bridges of varying sizes. Remote cameras installed at seven underpass sites in Virginia have recorded more than 2,700 wildlife photographs and documented 1,107 white-tailed deer crossings in the most heavily used structures. Underpasses with a minimum height of 12 ft were successful at facilitating deer passage. Such structures were also heavily used by a variety of wildlife species, including coyote, red fox, raccoon, groundhog, and opossum. Structures with drainages that mimic natural waterways can encourage use by a diversity of terrestrial, semi-aquatic, and aquatic species. This report provides guidance in choosing cost-effective underpass design and location features that are necessary to consider to increase motorist safety and habitat connectivity. The findings also demonstrate that if only a minimal number of deer-vehicle collisions is prevented by an effective underpass, the savings in property damage alone can outweigh the construction costs of the structure.
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The Use of Highway Underpasses by Large Mammals in Virginia and Factors Influencing Their Effectiveness
2005Co-Authors: Bridget M DonaldsonAbstract:The rapid increase in animal-vehicle collisions on U.S. roadways is a growing concern in terms of human safety, property damage and injury costs, and viability of wildlife populations. Wildlife crossing structures are gaining national recognition by transportation agencies as effective measures to reduce animal-vehicle collisions and connect wildlife habitats across transportation corridors. In Virginia, white-tailed deer and black bear pose the highest risk. This 1-year study was conducted to monitor various underpass structures in Virginia to determine the structural and location attributes that make a crossing successful in terms of use by large mammals. The Underpasses, most of which were not specifically designed as wildlife crossings, consist of box culverts and bridges of varying sizes. Remote cameras installed at seven underpass sites in Virginia have recorded more than 2,700 wildlife photographs and documented 1,107 white-tailed deer crossings in the most heavily used structures. Underpasses with a minimum height of 12 ft were successful at facilitating deer passage. Such structures were also heavily used by a variety of wildlife species, including coyote, red fox, raccoon, groundhog, and opossum. Structures with drainages that mimic natural waterways can encourage use by a diversity of terrestrial, semi-aquatic, and aquatic species. This report provides guidance in choosing cost-effective underpass design and location features that are necessary to consider to increase motorist safety and habitat connectivity. The findings also demonstrate that if only a minimal number of deer-vehicle collisions is prevented by an effective underpass, the savings in property damage alone can outweigh the construction costs of the structure.
