l Biological Conservation I992, 61, l97—202 Rates and causes of mortality in a fragmented population of Iberian lynx F elis pardina Temminck, 1824 ~ i P ... of the high humanization of the area surrounding the National Park (a similar... more
l Biological Conservation I992, 61, l97—202 Rates and causes of mortality in a fragmented population of Iberian lynx F elis pardina Temminck, 1824 ~ i P ... of the high humanization of the area surrounding the National Park (a similar case is described by Mech (1989) for the wolf). ...
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ABSTRACT The guiña (Leopardus guigna) is a small felid found primarily in temperate mixed forests of southern Andean and coastal ranges in Chile and Argentina. It is considered a vulnerable species, and is one of the least studied felids... more
ABSTRACT The guiña (Leopardus guigna) is a small felid found primarily in temperate mixed forests of southern Andean and coastal ranges in Chile and Argentina. It is considered a vulnerable species, and is one of the least studied felids in the world. In this study our main aim was to document the relationship between the activity pattern of the guiña and that of its main prey in the Valdivian rainforest (Comau Fjord, southern Chile) using a camera-trap survey. We documented the activity patterns of small mammals and two ground-foraging bird species, as these have been previously cited as the main prey of this felid. Guiñas showed two nocturnal activity peaks, at the beginning and the end of the night, and a weak peak of activity at midday. Small mammals consistently revealed nocturnal activity, whereas both birds were strongly diurnal. Our results revealed a high overlap between the activity patterns of guiñas and small mammals, whereas this was negligible for the bird species. These findings support the idea that small mammals are guiñas’ preferred prey in the Valdivian rainforest. Our study contributes to the understanding of the temporal relationships between the guiña and its prey, and may help to design effective management strategies to conserve this vulnerable felid.
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... JVLB was supported by a FPU fellow (Ministry of Education). Many people helped with field-work, especially JC Rivilla with the camera-trapping sampling. References ... Physical characteristics of Iberian lynxes (Lynx pardinus) from... more
... JVLB was supported by a FPU fellow (Ministry of Education). Many people helped with field-work, especially JC Rivilla with the camera-trapping sampling. References ... Physical characteristics of Iberian lynxes (Lynx pardinus) from Doñana, southwestern Spain. J. Mammal. ...
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A combination of xylazine hydrochloride-ketamine hydrochloride was used to immobilize 83 wild red foxes (Vulpes vulpes) (15 pups and 68 adults) at Doñana National Park (Spain). Mean ketamine hydrochloride doses were 17.1 mg/kg (SE = 1.53)... more
A combination of xylazine hydrochloride-ketamine hydrochloride was used to immobilize 83 wild red foxes (Vulpes vulpes) (15 pups and 68 adults) at Doñana National Park (Spain). Mean ketamine hydrochloride doses were 17.1 mg/kg (SE = 1.53) and 12.3 mg/kg (SE = 0.4) for pups and adults, respectively, and mean xylazine hydrochloride doses for the same groups were 6.2 mg/kg (SE = 0.63) and 4.7 mg/kg (SE = 0.14), respectively. Mean induction times and first reaction times were 1.6 minutes and 22.5 minutes for pups and 3.8 minutes and 39.4 minutes for adults, respectively. Recommended doses for wild adult foxes of unknown weight are 75 mg of ketamine hydrochloride and 20 mg of xylazine hydrochloride.
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ABSTRACT In the Doñana National Park (SW Spain), Eurasian Otters (Lutra lutra) harvest temporally some scattered ponds close to the Guadalquivir marshes. By analysing 307 spraints collected during three periods of pond occupancy, we used... more
ABSTRACT In the Doñana National Park (SW Spain), Eurasian Otters (Lutra lutra) harvest temporally some scattered ponds close to the Guadalquivir marshes. By analysing 307 spraints collected during three periods of pond occupancy, we used the otters’ diet to test the hypothesis that they leave these ponds when they have depleted their favourite prey (large Eels, Anguilla anguilla) and consequently are forced to eat less rewarding prey (small eels and Mosquitofish, Gambusia affair). Results indicate that the proportion of eels decreased in the otter’s diet, and that of mosquitofish increased, during the first and longest period of use of the pond by the otter, but not in two other instances of shorter occupation periods. Trophic diversity and average size of eaten eels did not change along the study. We suggest that temporal changes in habitat and trophie resources on a larger spatial scale could explain the decisions of the otter rather than a hypothetical giving-up density of the favourite prey in the studied pond.
Page 1. Habitat related differences in age structure and reproductive parameters of red foxes Christian GORTÁZAR, Pablo FERRERAS, Rafael VILLAFUERTE, María MARTÍN and Juan Carlos BLANCO Gortázar C., Ferreras P., Villafuerte R., Martín M.... more
Page 1. Habitat related differences in age structure and reproductive parameters of red foxes Christian GORTÁZAR, Pablo FERRERAS, Rafael VILLAFUERTE, María MARTÍN and Juan Carlos BLANCO Gortázar C., Ferreras P., Villafuerte R., Martín M. and Blanco JC 2003. ...