Browsing by Author "Gutiérrez, Julio R."
Now showing 1 - 16 of 16
Results Per Page
Sort Options
- ItemDiet Selection in Captivity by a Generalist Herbivorous Rodent (Octodon Degus) From the Chilean Coastal Desert(1998) Gutiérrez, Julio R.; Bozinovic Kuscevic, Francisco
- ItemEffects of Small Mammals and Vertebrate Predators on Vegetation in the Chilean Semiarid Zone(1997) Gutiérrez, Julio R.; Jaksic Andrade, Fabián
- ItemExclusion of small mammals and lagomorphs invasion interact with human-trampling to drive changes in topsoil microbial community structure and function in semiarid Chile(2018) Alfaro, Fernando D.; Manzano, Marlene; Abades T., Sebastián R.; Trefault Carrillo, Nicole Natalie; De la Iglesia Cabezas, Rodrigo Alonso; Gaxiola Alcantar, Aurora; Marquet, P. A. (Pablo A.); Gutiérrez, Julio R.; Meserve, Peter L.; Kelt, Douglas A.; Belnap, Jayne; Armesto, Juan J.
- ItemFenología de la papa (Solanum tuberosum) y su relación con la temperatura en Lipingüe (Décima Región, Chile) = Phenology of potato (Solanum tuberosum) and its relationship with temperature in Lipingüe (Decima Region, Chile).(1985) Gutiérrez, Julio R.; Bravo, Alonso; Jaeger, Nelson; Hajek, Ernst R.
- ItemLong-term research in Bosque Fray Jorge National Park: Twenty years studying the role of biotic and abiotic factors in a Chilean semiarid scrubland(2010) Gutiérrez, Julio R.; Jaksic Andrade, Fabián
- ItemSeasonality of conception in human populations in Chile(1981) Hajek, Ernst R.; Gutiérrez, Julio R.; Espinosa, G.Seasonality of conceptions in human populations in Chile was studied for a period of 30 years (1945 1974). Clear seasonal conception courses exist in the country, exception made of the northern and southern extremes. Seasonal flux is concentrated mainly in January, but also secondary increases in April and June were observed. Along the 30-year period a general pattern of decreasing seasonality is observed. Conception is significantly related to temperature and photoperiod in this country, the maximum rates of conceptions being observed in coincidence with the maximum temperatures and photoperiods. Nonclimatic factors which may be affecting seasonality of conceptions are also discussed.
- ItemSeasonality of mortality in human populations of Chile as related to a climatic gradient(1984) Hajek, Ernst R.; Gutiérrez, Julio R.; Espinosa, G. A.Mortality of human populations in Chile was studied from a latitudinal and seasonal perspective, and related to climate and main diseases. Approximately 3 mill. deaths were analyzed. Seasonality considered along a latitudinal and climatic gradient is almost absent in the northern portion of the country, in the central part peaks are evident in summer, at latitudes 40 S in winter and at 45 S in winter and spring. Seasonality along the years of analysis shows a different behaviour for the different zones of the country and no unique pattern is evident. A clear relationship between the air enthalpy and seasonality of mortality is detected. Circulatory diseases appear as the most important causes of deaths, exception made of latitude 40 where respiratory diseases are the significant causes of deaths. Age groups below one and above 65 years are mostly affected.
- ItemSize variation ofAcacia caven (leguminosae) pods along a climatic gradient in Chile(1981) Gutiérrez, Julio R.; Armesto, Juan J.A southward tendency of increment in pod-length is shown for 11 populations ofAcacia caven (Mol.) Hook et Arn. localized along a climatic gradient of increasing annual rainfall in Chile. This fact would suggest thatA. caven populations occurring in the south are in better conditions for reproduction than northern populations, since pod-length is related to the amount of seeds inside the pods. The possible bearing of this southward tendency of increasing seed production upon the expansion ofA. caven toward the more humid zones in southern Chile is discussed.
- ItemSpatial Distribution of Soil Nutrients and Ephemeral Plants Underneath and Outside the Canopy of Porlieria Chilensis Shrubs (Zygophyllaceae) in Arid Coastal Chile(1993) Gutiérrez, Julio R.; Jaksic Andrade, Fabián
- ItemStructure and Dynamics of Vegetation in a Chilean Arid Thornscrub Community(1993) Gutiérrez, Julio R.; Jaksic Andrade, Fabián
- ItemTemperature effect on autochory inColliguaya odorifera (Euphorbiaceae)(1980) Giliberto, J.; Gutiérrez, Julio R.; Hajek, Ernst R.Colliguaya odorifera Mol. is the only species of the Chilean matorral which shows an active dispersion of its seeds (autochory). This mechanism is dependent on daily variation of temperatures. Other climatic variables (air humidity of vapor pressure deficit) appear as not having direct influences on seed dispersal.
- ItemThe avifauna of Bosque Fray Jorge National Park and Chile's Norte Chico(2016) Kelt, Douglas A.; Cofré, Hernán; Cornelius, Cintia; Engilis Jr, Andrew; Gutiérrez, Julio R.; Marquet, P. A. (Pablo A.); Medel Sierralta, Rodrigo Miguel; Meserve, Peter L.; Quirici, Verónica; Samaniego, Horacio; Vásquez, Rodrigo A.
- ItemVariation in Vegetation and Seed Bank in a Chilean Semi-Arid Community Affected by Enso 1997(2000) Gutiérrez, Julio R.; Jaksic Andrade, Fabián
- ItemVegetation in a Altitudinal Gradient Along the Rio Loa in the Atacama Desert of Northern Chile(1998) Gutiérrez, Julio R.; Marquet, P. A. (Pablo A.)
- ItemVegetative responses to defoliation of two Chilean matorral shrubs(1980) Torres, Juan C.; Gutiérrez, Julio R.; Fuentes, EduardoThis paper reports the results of experimental defoliation of two common matorral species: Lithraea caustica and Colliguaya odorifera. L. caustica and C. odorifera are the matorral species previously shown to exhibit the highest and lowest levels of natural defoliation by browsing. Experimental defoliation was performed at four levels: 0% (controls), 25%, 66%, and 100%. C. odorifera exhibited vegetative responses stronger than controls only in the two highest levels of defoliation (66% and 100%), whereas L. caustica responded vigorously at the 25% and 100% levels. The results are related to the observed position of both species in the matorral community and their relative defoliation risks by natural and introduced herbivores.