Browsing by Author "Simonetti, Javier A."
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- ItemConservation Challenges for the Austral and Neotropical America Section(2009) Ceballos, Gerardo; Vale, Mariana M.; Bonacic Salas, Cristián; Calvo Alvarado, Julio; List, Rurik; Bynum, Nora; Medellín, Rodrigo A.; Simonetti, Javier A.; Rodríguez, Jon Paul
- ItemDiet of guanaco in sheep-free rangeland in Tierra del Fuego, Chile(2013) Muñoz, Alejandra E.; Simonetti, Javier A.
- ItemEuropean rabbits versus native rodents in Central Chile: effects on shrub seedlings(1983) Fuentes, Eduardo; Jaksic Andrade, Fabián; Simonetti, Javier A.The importance of the introduced rabbit Oryctolagus cuniculus and of the native rodent Octodon degus (=degu) as browsers of shrub seedlings in the Central Chilean evergreen shrublands (=matorral) was experimentally assessed. Seedlings were planted in several spatial arrangements in two open successional stands and in two mature stands of different cover and exposure. The browsing impact of rabbits and degus was evaluated separately after about one year since the start of the experiments. It was found that degus cause important seedling mortality only within a 5 m-radius centered at the border of their retreats. Rabbits, on the other hand, cause heavier seedling mortality, forage more widely, and consequently have a greater impact than do degus. It is speculated that rabbits may be halting the secondary succession process, shifting the matorral composition toward less palatable shrub species, and/or broadening the spacing between shrub clumps.
- ItemFood preferences by Octodon degus (Rodentia caviomorpha): Their role in the chilean matorral composition(1981) Simonetti, Javier A.; Montenegro Rizzardini, GloriaThe food preferences of Octodon degus are examined in laboratory test. Results indicate that degus prefer new rather than mature leaves of Chilean matorral shrubs, and that degus do not discriminate between new leaves (equivalents of shrub seedlings) of different shrub species. The significance of degus preferences in relation to matorral composition is discussed.
- ItemMicrohabitat use by European rabbits (Oryctolagus cuniculus) in central Chile: Are adult and juvenile patterns the same?(1982) Simonetti, Javier A.; Fuentes, EduardoRabbits (Oryctolagus cuniculus) have been recently introduced to central Chile; adult rabbits have been previously reported to exhibit a release in their use of microhabitats due to lack of effective predation upon them. This paper shows that kittens and juvenile rabbits do not exhibit the same microhabitat use pattern as adults, in spite of the very low predation pressure upon them. These results suggest that small rabbits are ecologically comparable to native rodents.
- ItemRattus rattus, a potential threat to the endangered tree Gomortega keule in the Maulino forest of Chile(2020) Barceló Carvajal, Matías Paulo; Simonetti, Javier A.