Browsing by Author "SIMONETTI, JA"
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- ItemAN ASSESSMENT OF THE RUDERAL STRATEGY IN HERBS - THE CASE OF PLANTAGO-HISPIDULA(1981) WALKOWIAK, AM; SIMONETTI, JA
- ItemDefensive patterns in shrubs of central Chile; a common strategy?(1984) WALKOWIAK, AM; SIMONETTI, JA; SEREY, I; Jordán Zimmerman, Miguel; ARRANZ, R; Montenegro Rizzardini, Gloria
- ItemEUROPEAN RABBITS VERSUS NATIVE RODENTS IN CENTRAL CHILE - EFFECTS ON SHRUB SEEDLINGS(1983) FUENTES, ER; JAKSIC, FM; SIMONETTI, JAThe importance of the introduced rabbit Ooryctolagus cunicueus 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 2 open successional stands and in 2 mature stands of different cover and exposure. The browsing impact of rabbits and degus was evaluated separately after .apprx. 1 yr since the start of the experiments. Degus cause important seedling mortality only within a 5 m-radius centered at the border of their retreats. Rabbits cause heavier seedling mortality, forage more widely and, consequently, have a greater impact than do degus. 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, JA; MONTENEGRO, GThe food preferences of O. degus were examined in laboratory tests. Degus preferred new rather than mature leaves of Chilean matorral shrubs and 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.
- ItemHABITAT USE BY 2 RODENT SPECIES IN THE HIGH ANDES OF CENTRAL CHILE(1985) SIMONETTI, JA; FUENTES, ER; OTAIZA, RDThe pattern of habitat use by 2 cricetid rodent species, Akodon andinus and Phyllotis xanthopygus, in the high Andes of central Chile is described. Both rodents are spatially restricted to areas with protective cover (rock outcrops and shrub patches). The rodents partition the refuge areas: P. xanthopygus uses mainly rocks and A. andinus uses mainly shrub patches. Predation probably can account for habitat restriction; interspecific competition appears to explain microhabitat partitioning.
- ItemMICROHABITAT USE BY EUROPEAN RABBITS (ORYCTOLAGUS-CUNICULUS) IN CENTRAL CHILE - ARE ADULT AND JUVENILE PATTERNS THE SAME(1982) SIMONETTI, JA; FUENTES, ERRabbits (O. cuniculus) were recently introduced to central Chile; adult rabbits were previously reported to exhibit a release in their use of microhabitats due to lack of effective predation upon them. Kittens and juvenile rabbits do not exhibit the same microhabitat use pattern as adults, in spite of the very low predation pressure upon them. Small rabbits are ecologically comparable to native rodents.
- ItemMORPHOCHEMICAL CORRELATES OF THE PALATABILITY OF 2 CHILEAN SHRUBS(1984) SIMONETTI, JA; Montenegro Rizzardini, Gloria; Jordán Zimmerman, Miguel; ARRANZ, R
- ItemPREDATOR PREY RELATIONSHIPS AMONG TERRESTRIAL VERTEBRATES - AN EXHAUSTIVE REVIEW OF STUDIES CONDUCTED IN SOUTHERN SOUTH-AMERICA(1987) JAKSIC, FM; SIMONETTI, JA
- ItemSHRUB PREFERENCES OF NATIVE AND INTRODUCED CHILEAN MATORRAL HERBIVORES(1983) SIMONETTI, JA; FUENTES, ER