Browsing by Author "d964b555-85a6-4dd6-b22a-d5447504b7be"
Now showing items 21-39 of 39
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Guevara, R.; Armesto, Juan J.; Carú Marambio, Margarita (2002)The cyanobacteria belonging to the genus Nostoc fix atmospheric nitrogen, both as free-living organisms and in symbiotic associations with a wide range of hosts, including bryophytes, gymnosperms (cycads), the small water ...
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Reid, Sharon; Díaz, Iván A.; Armesto, Juan J.; Willson, Mary F. (American Ornithological Society, 2004)In South American temperate rainforests, five endemic understory birds (four Rhinocryptidae and one Furnariidae) are often associated with the main understory plant, the native bamboo Chusquea valdiviensis (Poaceae: ...
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Jiménez, Héctor E.; Armesto, Juan J. (1992)Abstract. The dynamics of the seed bank may provide clues to the process of recovery of the vegetation of disturbed sites. The role of the seed bank may be more important in areas with a seasonal climate than in areas where ...
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Pérez, Cecilia A.; Silva, Wladimir A.; Aravena, Juan C.; Armesto, Juan J. (Institute of Arctic and Alpine Research, 2017)© 2017 Regents of the University of Colorado. We tested the main hypothesis that nutrient accumulation during late stages of postglacial succession would decrease nutrient limitation of diazotrophic activity. We tested ...
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Díaz, Iván A.; Armesto, Juan J.; Reid, Sharon; Sieving, Kathryn E.; Willson, Mary F. (2005)We show how Chilean forest bird species richness, abundance and guild structure changes as a function of structural properties of forest stands. We surveyed bird assemblages in two old-growth (>200 years), two ...
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Pérez, Cecilia A.; Armesto, Juan J.; Torrealba, Cristian; Carmona, Martín R. (2003)In unpolluted regions, where inorganic nitrogen (N) inputs from the atmosphere are minimal, such as remote locations in southern South America, litterfall dynamics and N use efficiency of tree species should be coupled to ...
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De Santo, Toni L.; Willson, Mary F.; Sieving, Kathryn E.; Armesto, Juan J. (American Ornithologist Society, 2002)We studied the effect of forest fragmentation on the nesting biology and reproductive success of three species of tapaculos (Rhinocryptidae) in relation to forest size, edge effects, and disturbance from livestock or logging ...
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Pérez, Cecilia A.; Hedin, Lars O.; Armesto, Juan J. (1998)Studies in unpolluted, old-growth forests in the coastal range of southern Chile (42°30′S) can provide a baseline for understanding how forest ecosystems are changing due to the acceleration of nitrogen (N) inputs that has ...
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Díaz, María F.; Armesto, Juan J. (2007)Successional shrublands created by clearcutting and burning of forests are frequent in Chiloé Island and surrounding mainland in southern Chile. These areas are characterized by seasonally waterlogged soils, and vegetation ...
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Christie, Duncan A.; Armesto, Juan J. (2003)1. We studied the importance of fallen logs as recruitment sites for tree species, their role in species coexistence, and also the influence of canopy openness and litter depth on tree species establishment in mid-successional ...
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Gutiérrez, Avaro G.; Barbosa, Olga; Christie, Duncan A.; Del-Val, Ek; Ewing, Holly A.; Jones, Clive G.; Marquet, Pablo A.; Weathers, Kathleen C.; Armesto, Juan J. (2008)The persistence of rainforest patches at Fray Jorge National Park (FJNP) in semiarid Chile (30°40′S), a region receiving approximately 147mm of annual rainfall, has been a source of concern among forest managers. These ...
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Vergara, Pablo M.; Armesto, Juan J. (2009)Although it is recognized that anthropogenic forest fragmentation affects habitat use by organisms across multiple spatial scales, there is uncertainty about these effects. We used a hierarchical sampling design spanning ...
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Armesto, Juan J.; Díaz, Iván; Papic, Claudia; Willson, Mary F. (Blackwell Publishing, 2001)In temperate rainforests on Chiloé Island in southern Chile (42°S), most canopy trees bear fleshy, avian-dispersed propagules, whereas emergent tree species have dry, wind-borne propagules. In the present study, the following ...
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del-Val, Ek; Armesto, Juan J. (2010)Herbivory rates are generally thought to be higher in tropical than in temperate forests. Nevertheless, tests of this biogeographic prediction by comparing a single plant species across a tropical-temperate range are scarce. ...
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Suárez, Lorena H.; Pérez, Fernanda; Armesto, Juan J. (2011)Floral trait expression in wild populations varies in relation to environmental gradients. Variation can be observed among and within plant populations. We investigated the changes in floral phenotype within populations ...
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Pérez, Cecilia A.; Carmona Ortiz, Martín; Aravena Donaire, Juan Carlos; Armesto Zamudio, Juan José (Springer, 2004)Vast areas of southern Chile are now covered by second-growth forests because of fire and logging. To study successional patterns after moderate-intensity, anthropogenic fire disturbance, we assessed differences in soil ...
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Rozzi, Ricardo; Silander, John; Armesto, Juan J.; Feinsinger, Peter; Massardo, Francisca (2000)The diversity of native species assemblages and that of indigenous cultures that once characterized the temperate forests of southern Chile have experienced a process of homogenization ever since the Spanish conquest. Today ...
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Vidiella, Patricia E.; Armesto, Juan J.; Gutiérrez, Julio R. (Academic Press, 1999)We describe the changes in plant cover, species richness, and flowering after rainfall over an entire growing season (September 1989-January 1990) in a southern Atacama Desert site in Chile. One month after the rain, ...
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Battles, John J.; Armesto, Juan J.; Vann, David R.; Zarin, Daniel J.; Aravena, Juan Carlos; Pérez, Cecilia; Johnson, Arthur H. (2002)Research in pristine forests provides a necessary reference of energy and nutrient cycling in absence of anthropogenic influence. Therefore two unpolluted watersheds in the Cordillera de Piuchué of southern Chile (42°30′ ...