Los jaguares son carnívoros oportunistas, cuya dieta depende principalmente de la disponibilidad ... more Los jaguares son carnívoros oportunistas, cuya dieta depende principalmente de la disponibilidad de sus presas. La depredación de tortugas marinas por parte de los jaguares ha sido raramente documentada en México. En este estudio registramos la depredación de tortugas caguamas (Caretta caretta) y verdes (Chelonia mydas) por parte de jaguares en la región de Mahahual, en el estado de Quintana Roo, México. De mayo a agosto de 2021, se establecieron 10 estaciones de fototrampeo en una playa de anidación. De forma paralela se realizaron recorridos nocturnos y diurnos a lo largo de las playas, con el fin de detectar tortugas que ovopositaran en el sitio, así como carcasas en el sitio que presentaran señales de depredación. Con un esfuerzo de muestreo de 600 noches / cámara se obtuvieron 10 eventos independientes de la presencia de jaguar en la zona, los cuales sucedieron en horarios diversos tanto diurnos como nocturnos, así como 3 eventos fotográficos en los que se confirmó la depr...
The southern limit of the Golden Eagle's (Aquila chrysaetos) breeding range in North America ... more The southern limit of the Golden Eagle's (Aquila chrysaetos) breeding range in North America is Mexico, where the eagle is the national symbol yet designated as a threatened, high priority species for conservation action. Movement information needed for conserving Mexico's Golden Eagles is sparse; knowledge of dispersal from natal areas is essential to understand the eagle's ecology and help provide for its management. Using satellite telemetry data, we analyzed movements of three males and one female from central Mexico during their first year of life; we documented (1) timing and distance of initial dispersal movements, (2) total distance traveled and maximum distance from natal site by month of age following fledging, and (3) size of areas (based on 95% adaptive local convex hulls) across which eagles ranged following initial dispersal. Individual eagles dispersed from their natal areas between mid-September and mid-November, at 6–8 mo of age. Monthly total distance t...
Jaguars are opportunistic carnivores whose diet mainly depends on prey availability. Jaguar preda... more Jaguars are opportunistic carnivores whose diet mainly depends on prey availability. Jaguar predation on sea turtles has not been sufficiently documented in México. In this study, we recorded the predation of loggerhead (Caretta caretta) and green (Chelonia mydas) sea turtles by jaguar (Panthera onca) in Mahahual, Quintana Roo, México. From May to August 2021, 10 camera-trap stations were set on a nesting beach. Meanwhile, daytime and nighttime tours were conducted along the beach to detect turtles nesting on the site, as well as carcasses with evidence of predation. With a sampling effort of 600 camera trap nights, we obtained 10 independent jaguar predation events and 3 photo events confirming jaguar predation on sea turtles. Jaguar predation on sea turtles has been documented on Costa Rican beaches, but rarely in México. This report contributes to improving our understanding of the diet of the jaguar in coastal areas and the relationship between this feline species and sea turtles in México.
ABSTRACT.—The southern limit of the Golden Eagle’s (Aquila chrysaetos) breeding range in North Am... more ABSTRACT.—The southern limit of the Golden Eagle’s (Aquila chrysaetos) breeding range in North America is Mexico, where the eagle is the national symbol yet designated as a threatened, high priority species for conservation action. Movement information needed for conserving Mexico’s Golden Eagles is sparse; knowledge of dispersal from natal areas is essential to understand the eagle’s ecology and help provide for its management. Using satellite telemetry data, we analyzed movements of three males and one female from central Mexico during their first year of life; we documented (1) timing and distance of initial dispersal movements, (2) total distance traveled and maximum distance from natal site by month of age following fledging, and (3) size of areas (based on 95% adaptive local convex hulls) across which eagles ranged following initial dispersal. Individual eagles dispersed from their natal areas between mid-September and mid-November, at 6–8 mo of age. Monthly total distance traveled by males reached approximately 350–1350 km at 8–11 mo; the female’s peak monthly travel was 3000 km, at age 7 mo. Monthly proximity to natal sites by individuals at ages 8–12 mo was relatively constant, averaging 17.9 km (SD¼5.7) to 129.1 km (SD¼11.3). After dispersal, the monthly ranging areas overall increased during the first year of life for all eagles, especially the female, due mainly to multiple long-distance excursions. Our data suggest that movement behavior of juvenile Golden Eagles from Mexico is mostly similar to that of conspecifics from nonmigratory populations elsewhere. Our study may help serve as a foundation for future work to better understand movement dynamics and resource selection by Mexico’s Golden Eagles.
Re-introduction of the Mexican wolf in the Sierra Madre Occidental, Mexico. pp. 116-119. En: Soor... more Re-introduction of the Mexican wolf in the Sierra Madre Occidental, Mexico. pp. 116-119. En: Soorae, P. S. (ed.) (2013). Global Re-introduction Perspectives: 2013. Further case studies from around the globe. Gland, Switzerland: IUCN/SSC Re-introduction Specialist Group and Abu Dhabi, UAE: Environment Agency-Abu Dhabi. xiv + 282 -
Un debate de especialistas acerca de métodos y técnicas para monitoreo de poblaciones y hábitat, ... more Un debate de especialistas acerca de métodos y técnicas para monitoreo de poblaciones y hábitat, para determinación y gestión de la cosecha sustentable, y para el seguimiento de resultados.
Los jaguares son carnívoros oportunistas, cuya dieta depende principalmente de la disponibilidad ... more Los jaguares son carnívoros oportunistas, cuya dieta depende principalmente de la disponibilidad de sus presas. La depredación de tortugas marinas por parte de los jaguares ha sido raramente documentada en México. En este estudio registramos la depredación de tortugas caguamas (Caretta caretta) y verdes (Chelonia mydas) por parte de jaguares en la región de Mahahual, en el estado de Quintana Roo, México. De mayo a agosto de 2021, se establecieron 10 estaciones de fototrampeo en una playa de anidación. De forma paralela se realizaron recorridos nocturnos y diurnos a lo largo de las playas, con el fin de detectar tortugas que ovopositaran en el sitio, así como carcasas en el sitio que presentaran señales de depredación. Con un esfuerzo de muestreo de 600 noches / cámara se obtuvieron 10 eventos independientes de la presencia de jaguar en la zona, los cuales sucedieron en horarios diversos tanto diurnos como nocturnos, así como 3 eventos fotográficos en los que se confirmó la depr...
The southern limit of the Golden Eagle's (Aquila chrysaetos) breeding range in North America ... more The southern limit of the Golden Eagle's (Aquila chrysaetos) breeding range in North America is Mexico, where the eagle is the national symbol yet designated as a threatened, high priority species for conservation action. Movement information needed for conserving Mexico's Golden Eagles is sparse; knowledge of dispersal from natal areas is essential to understand the eagle's ecology and help provide for its management. Using satellite telemetry data, we analyzed movements of three males and one female from central Mexico during their first year of life; we documented (1) timing and distance of initial dispersal movements, (2) total distance traveled and maximum distance from natal site by month of age following fledging, and (3) size of areas (based on 95% adaptive local convex hulls) across which eagles ranged following initial dispersal. Individual eagles dispersed from their natal areas between mid-September and mid-November, at 6–8 mo of age. Monthly total distance t...
Jaguars are opportunistic carnivores whose diet mainly depends on prey availability. Jaguar preda... more Jaguars are opportunistic carnivores whose diet mainly depends on prey availability. Jaguar predation on sea turtles has not been sufficiently documented in México. In this study, we recorded the predation of loggerhead (Caretta caretta) and green (Chelonia mydas) sea turtles by jaguar (Panthera onca) in Mahahual, Quintana Roo, México. From May to August 2021, 10 camera-trap stations were set on a nesting beach. Meanwhile, daytime and nighttime tours were conducted along the beach to detect turtles nesting on the site, as well as carcasses with evidence of predation. With a sampling effort of 600 camera trap nights, we obtained 10 independent jaguar predation events and 3 photo events confirming jaguar predation on sea turtles. Jaguar predation on sea turtles has been documented on Costa Rican beaches, but rarely in México. This report contributes to improving our understanding of the diet of the jaguar in coastal areas and the relationship between this feline species and sea turtles in México.
ABSTRACT.—The southern limit of the Golden Eagle’s (Aquila chrysaetos) breeding range in North Am... more ABSTRACT.—The southern limit of the Golden Eagle’s (Aquila chrysaetos) breeding range in North America is Mexico, where the eagle is the national symbol yet designated as a threatened, high priority species for conservation action. Movement information needed for conserving Mexico’s Golden Eagles is sparse; knowledge of dispersal from natal areas is essential to understand the eagle’s ecology and help provide for its management. Using satellite telemetry data, we analyzed movements of three males and one female from central Mexico during their first year of life; we documented (1) timing and distance of initial dispersal movements, (2) total distance traveled and maximum distance from natal site by month of age following fledging, and (3) size of areas (based on 95% adaptive local convex hulls) across which eagles ranged following initial dispersal. Individual eagles dispersed from their natal areas between mid-September and mid-November, at 6–8 mo of age. Monthly total distance traveled by males reached approximately 350–1350 km at 8–11 mo; the female’s peak monthly travel was 3000 km, at age 7 mo. Monthly proximity to natal sites by individuals at ages 8–12 mo was relatively constant, averaging 17.9 km (SD¼5.7) to 129.1 km (SD¼11.3). After dispersal, the monthly ranging areas overall increased during the first year of life for all eagles, especially the female, due mainly to multiple long-distance excursions. Our data suggest that movement behavior of juvenile Golden Eagles from Mexico is mostly similar to that of conspecifics from nonmigratory populations elsewhere. Our study may help serve as a foundation for future work to better understand movement dynamics and resource selection by Mexico’s Golden Eagles.
Re-introduction of the Mexican wolf in the Sierra Madre Occidental, Mexico. pp. 116-119. En: Soor... more Re-introduction of the Mexican wolf in the Sierra Madre Occidental, Mexico. pp. 116-119. En: Soorae, P. S. (ed.) (2013). Global Re-introduction Perspectives: 2013. Further case studies from around the globe. Gland, Switzerland: IUCN/SSC Re-introduction Specialist Group and Abu Dhabi, UAE: Environment Agency-Abu Dhabi. xiv + 282 -
Un debate de especialistas acerca de métodos y técnicas para monitoreo de poblaciones y hábitat, ... more Un debate de especialistas acerca de métodos y técnicas para monitoreo de poblaciones y hábitat, para determinación y gestión de la cosecha sustentable, y para el seguimiento de resultados.
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management. Using satellite telemetry data, we analyzed movements of three males and one female from
central Mexico during their first year of life; we documented (1) timing and distance of initial dispersal movements, (2) total distance traveled and maximum distance from natal site by month of age following fledging, and (3) size of areas (based on 95% adaptive local convex hulls) across which eagles ranged following initial dispersal. Individual eagles dispersed from their natal areas between mid-September and mid-November, at 6–8 mo of age. Monthly total distance traveled by males reached approximately 350–1350 km at 8–11 mo; the female’s peak monthly travel was 3000 km, at age 7 mo. Monthly proximity to natal sites by individuals at ages 8–12 mo was relatively constant, averaging 17.9 km (SD¼5.7) to 129.1 km (SD¼11.3). After dispersal, the monthly ranging areas overall increased during the first year of life for all eagles, especially the female, due mainly to multiple long-distance excursions. Our data suggest that movement
behavior of juvenile Golden Eagles from Mexico is mostly similar to that of conspecifics from nonmigratory populations elsewhere. Our study may help serve as a foundation for future work to better understand movement dynamics and resource selection by Mexico’s Golden Eagles.
management. Using satellite telemetry data, we analyzed movements of three males and one female from
central Mexico during their first year of life; we documented (1) timing and distance of initial dispersal movements, (2) total distance traveled and maximum distance from natal site by month of age following fledging, and (3) size of areas (based on 95% adaptive local convex hulls) across which eagles ranged following initial dispersal. Individual eagles dispersed from their natal areas between mid-September and mid-November, at 6–8 mo of age. Monthly total distance traveled by males reached approximately 350–1350 km at 8–11 mo; the female’s peak monthly travel was 3000 km, at age 7 mo. Monthly proximity to natal sites by individuals at ages 8–12 mo was relatively constant, averaging 17.9 km (SD¼5.7) to 129.1 km (SD¼11.3). After dispersal, the monthly ranging areas overall increased during the first year of life for all eagles, especially the female, due mainly to multiple long-distance excursions. Our data suggest that movement
behavior of juvenile Golden Eagles from Mexico is mostly similar to that of conspecifics from nonmigratory populations elsewhere. Our study may help serve as a foundation for future work to better understand movement dynamics and resource selection by Mexico’s Golden Eagles.