Livestock predation is one of the major causes conflicts between humans and pumas ( Puma concolor ). Using data from interviews with ranchers kill-site inspections, we characterized puma–livestock in Villarino Patagones counties central Argentinean rangelands. Depredation was considered cause livestock losses, puma attacks were reported 46.6% 35.4% ranches Patagones, respectively. The majority underwent losses smaller than 1000 USD. proportion lost to (0.1–10.4%) financial (5.3–1560.4 USD)...

The role that mammalian carnivores play in ecosystems can be deeply altered by human-driven habitat disturbance. While most carnivore species are negatively affected, the impact of changes is expected to depend on their ecological flexibility. We aimed identify key factors affecting use four sympatric landscapes central Argentina. Camera trapping surveys were carried out at 49 sites from 2011 2013. Each site was characterized 12 attributes, including human disturbance and fragmentation. Four...

Las poblaciones de guanaco en Argentina sufrieron una drástica disminución durante el siglo XX que empezó a revertirse los últimos 30 años. A pesar esto, la provincia Buenos Aires aún posee solamente pequeñas relictuales dos reservas naturales ubicadas al sudoeste provincia. Reportamos registros nuevas posibles áreas presencia largo plazo partido Patagones, por fuera protegidas. Estas contribuyen plantear necesidad mayor exploración zona, enfocada establecimientos productivos, para favorecer...

Three experiments were conducted to determine problem-solving strategies used by toads, Rhinella arenarum (= Bufo arenarum), in spatial learning situations, using water as reward. Experiment 1 showed that toads can acquire a orientation based on body-centered turn -an internal self-reference cue. 2 use fixed landmark (visual cue) guidance solve problem. 3 determined whether maze was "body-centered turn" or "guidance". In this case, animals trained with visual cue relation (i.e.,...

Geoffroy's cat (Oncifelis geoffroyi) is a little-known South American felid. We report here the first detailed data on its food habits and variations among 3 areas of Argentine Pampas grassland. Analysis 421 scat samples showed relatively narrow trophic niche, dominated by vertebrates, especially small rodents. Despite wide overlap in diet composition, geographical variation was found frequency occurrence primary categories, presence secondary items, mean weight vertebrate prey. These...

Discrimination of and memory for others' generous selfish behaviors could be adaptive abilities in social animals. Dogs have seemingly expressed such skills both direct indirect interactions with humans. However, recent studies suggest that their capacity may rely on cues other than people's individual characteristics, as the place where person stands. Thus, conditions under which dogs recognize humans when solving cooperative tasks still remains unclear. With aim contributing to this...

Biological invasions are one of the main components human-caused global change and their negative impact on invaded ecosystems have long been recognized. Invasive mammals, in particular, can threaten native biodiversity cause economic impacts region where they introduced, often through a wide range conflicts with humans. Although wild boar, Sus scrofa, is considered by IUCN as 100 invasive species most damaging to world, Argentina there only few studies focused its ecology them conducted...

Despite recent taxonomic evaluations of Mephitidae and North American hog-nosed skunks, southern South species Conepatus have not been thoroughly examined in a systematic context. chinga humboldtii were described more than 150 years ago, based on external characters such as hair coloration size. Although historically recognized valid species, to date no detailed analysis has performed for either these taxa. Herein, we evaluated the status C. within part America using geometric morphometrics...

Abstract Geoffroy's cat Oncifelis geoffroyi is a little‐known South American small felid. We report data on the spatial ecology of four adults (two males and two females) that were radiotracked in an area wet grassland Argentine Pampas from February 2000 to April 2001. The mean home range size varied 248 ha [90% minimum convex polygon (MCP)] 342 (100% MCP), with male ranges c . 2.5 larger than those females. Home overlap averaged 44.7%, was more extensive between females but it decreased...

The histology of the salivary glands armadillo Zaedyus pichiy (Desmarest, 1804) was studied.Three pairs major compound tubuloacinar glands, parotid, submandibular and sublingual, were distinguished.The parotid gland is histologically a serous gland.The consists two lobes.The anterior lobe composed mixed acini.The posterior predominantly mucous.There reservoir or bladder, related with lobe.The sublingual mixed, mucous acini scattered demilunes.

The dorsal surface of the tongue Zaedyus pichiy (Desmarest, 1804) was examined by scanning electron microscopy.Conical and branched filiform, fungiform vallate papillae are described.No foliate were seen.Conical filiform distributed in apex, both lateral edges caudally to vallated ones.The represent most numerous type lingual papillae; they over entire tongue.The placed among ones, more densely on tip apex.In posterior third there two surrounded a deep circular grove.Fungiform circumvallate...

We radio-tracked 16 individuals (6 males, 10 females) of the little known Molina’s hog-nosed skunk ( Conepatus chinga (Molina, 1782)) and compared home-range dynamics, movement rates, densities between a protected area landscape fragmented by agriculture. The mean size (95% fixed kernel) was 166.7 ha (SD = 107.5 ha), without significant differences areas. Home-range varied significantly males (mean 243.7 ha, SD 76.5 ha) females 120.4 =77.6 ha). Overlap home range core extensive within sexes...

The use of environmental visual cues for navigation is an ability present in many groups animals.The effect spatial proximity between a cue and goal on reorientation environment has been studied several vertebrate groups, but never previously amphibians.In this study we tested the local (beacons) to orient open field terrestrial toad Rhinella arenarum.Experiment 1 showed that animals could space using two located near rewarded container.Experiment 2 used only one placed at different...

A traves de la microscopia electronica barrido, fueron analizadas las caracteristicas superficie dorsal lengua Chaetophractus vellerosus. Fueron observadas papilas filiformes simples y ramificadas, fungiformes caliciformes. Papilas conicas, se observaron en el apice, bordes laterales tercio posterior, caudalmente a Las ramificadas estaban densamente distribuidas toda lengua. entre ramificadas. En posterior visualizadas dos tienen funcion mecanica, tanto que caliciformes son gustativas, ellas...

We report new data on the intersexual and geographical variation in body mass of Geoffroy's cat (Oncifelis geoffroyi d'Orbigny Gervais 1844), a little known small from South America, combine them with existing information to compare alternative hypotheses for mass.Most O. have been obtained previous research this felid four study areas southern Brazil central Argentina.These were added those reported other three additional locations.Our results set 4.26 ± 1.03 kg (mean SD, n = 56).We also...

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We radiotracked 16 (6 males, 10 females) adult Molina's hog-nosed skunks (Conepatus chinga) to examine habitat selection using compositional analysis at 2 spatial scales in a protected area and landscape fragmented by agriculture. To aid understanding the use of skunks, abundance invertebrates was estimated each habitat. Habitat varied between study sites. Skunks selected level but not home range area. In cropland showed overall both scales, although we did detect significant ranking...

We compared the diet of adult Pampas foxes (Lycalopex gymnocercus) and their cubs in a grassland area Argentina by analysing 152 scats (adults: 92, cubs: 60). used an Index Relative Importance (IRI) to determine contribution prey items diet. IRI scores for rodents, hares birds were higher cubs, whereas adults consumed grasshoppers larvae more often than did. Fruits carrion ungulates only adults. Both number per scat diversity smaller conclude that fox behaves as typical central place...

Se estudio la histologia de las glandulas salivales del armadillo Dasypus hybridus. distinguen dos pares salivales, parotidas y submaxilares un reservorio salival. Las se localizan en posicion anterior con respecto a submaxilares, son exclusivamente serosas los conductos intralobulares excretores intercalares y, particularmente estriados, muy numerosos. mayor tamano poseen lobulos que difieren tanto histologica como histoquimicamente. El lobulo es mixto resulta notable presencia numerosos...

The Hypertrophy of