Browsing by Author "Armesto, Juan J."
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- ItemA framework for the classification Chilean terrestrial ecosystems as a tool for achieving global conservation targets(2017) Martínez, K.; Núñez, M.; León, C.; Pliscoff, Patricio; Squeo, F.; Armesto, Juan J.
- ItemA network analysis of plant-pollinator interactions in temperate rain forests of Chiloe, Island, Chile(2009) Ramos Jiliberto, Rodrigo; Smith-Ramírez, Cecilia.; Arim I., Matías.; Armesto, Juan J.; Marquet, P. A. (Pablo A.)
- ItemAcacia caven nurses endemic sclerophyllous trees along a successional pathway from silvopastoral savanna to forest(2017) Root-Bernstein, Meredith; Valenzuela, Rafael; Huerta, Margarita; Armesto, Juan J.; Jaksic Andrade, Fabián
- ItemAdvanced canopy regeneration: an unrecognized mechanism of forest dynamics(2021) Díaz, Iván A.; Godoy Güinao, Javier; Mellado Mansilla, Daniela; Moreno González, Ricardo; Cuq, Emilio; Ortega Solís, Gabriel; Armesto, Juan J.
- ItemAlteration of the hydrologic cycle due to forest clearing and its consequences for rainforest succession(2007) Díaz, Marco A.; Armesto, Juan J.
- ItemAltitudinal and interannual variation in seedling survival of tree species in central Chile: implications for sclerophyllous forest restoration(2016) Becerra Osses, Pablo Ignacio; Smith Ramírez, Cecilia; Armesto, Juan J.
- ItemARTHROPODS IN THE DIET OF THE BIRD ASSEMBLAGE FROM A FORESTED RURAL LANDSCAPE IN NORTHERN CHILOE ISLAND, CHILE: A QUANTITATIVE STUDY(2017) Munoz, C.; Ippi, S.; Celis, J.; Salinas, D.; Armesto, Juan J.
- ItemAssessing Ecological Indicators for Remnant Vegetation Strips as Functional Biological Corridors in Chilean Vineyards(2021) Diaz-Forestier, Javiera; Abades, Sebastian; Pohl, Nelida; Barbosa, Olga; Godoy, Karina; Svensson, Gabriella L.; Undurraga, Maria, I; Bravo, Camila; Garcia, Camila; Root-Bernstein, Meredith; Armesto, Juan J.; Celis-Diez, Juan L.Mediterranean central Chile is globally recognized as a hotspot for terrestrial biodiversity due to its high endemism and massive habitat loss. However, within the rural landscape of central Chile, significant extents of natural areas remain, especially on less productive, steep slopes, and vegetation strips extending from the surrounding hills to agricultural areas. Accordingly, vegetation strips or corridors, within lowland farms, constitute key elements to support the conservation of biodiversity in rural landscapes. To assess the ecological performance of corridors in 22 commercials vineyards in central Chile, we characterized them in terms of width-, length-, area-, and perimeter-to-area ratios, as well as the number of connections with natural areas. Based on a set of previously defined ecological indicators (species, functional groups, and structural components), we compared their occurrence in corridors within vineyards and in the surrounding natural areas. We evaluated the effects of corridor attributes on the occurrence of the selected ecological indicators, using a generalized linear mixed model with each vineyard as a random factor. The area, width, and length of vegetation corridors varied widely (1.2-86.3 ha, 10.5-95 m, and 380-5000 m, respectively). We found significant differences in the occurrence of indicators between corridors and natural areas. All sampled ecological indicators in corridors showed a negative relationship with the distance to the nearest natural area. Vegetation strips within vineyards represent important opportunities for biodiversity conservation that significantly enhance habitat quality in the agricultural landscape for biodiversity and habitat connectivity.
- ItemAssessing the influence of life form and life cycle on the response of desert plants to past climate change : genetic diversity patterns of an herbaceous lineage of Nolana along western South America(2017) Ossa, P.; Armesto, Juan J.; Pérez Trautmann, María Fernanda
- ItemAvian ecosystem functions are influenced by small mammal ecosystem engineering(2013) Root-Bernstein, Meredith Marie.; Armesto, Juan J.; Ebensperger Pesce, Luis Alberto
- ItemAvian gut-passage effects on seed germination of shrubland species in Mediterranean central Chile(2011) Reid Woodforde-Booth, Sharon Deborah.; Armesto, Juan J.
- ItemBet-hedging strategies of native and exotic annuals promote coexistence in semiarid Chile(2016) Kelt, D.; Gutiérrez, J.; Jaksic Andrade, Fabián; Jiménez, M.; Gaxiola Alcantar, Aurora; Armesto, Juan J.; González Browne, C.; Meserve, P.
- ItemBiocultural homogenization in Urban settings: Public knowledge of birds in city parks of Santiago, Chile(2017) Celis Diez, Juan Luis; Muñoz, C.; Abades T., Sebastián R.; Marquet, P. A. (Pablo A.); Armesto, Juan J.
- ItemBiodiversity knowledge loss in children's books and textbooks(2016) Celis Diez, Juan Luis; Díaz Forestier, Javiera; Márquez Garcia, Marcela; Lazzarino, Silvia; Rozzi, Ricardo; Armesto, Juan J.
- ItemBiological nitrogen fixation in a post-volcanic chronosequence from south-central Chile(2017) Pérez Barrientos, Cecilia Antonieta; Thomas, Frank M.; Silva, Wladimir A.; Aguilera, Rodrigo; Armesto, Juan J.
- ItemBiotic and abiotic controls on tree colonization in three early successional communities of Chiloe Island, Chile(2011) Bustamante Sánchez, Marcela Andrea; Armesto, Juan J.
- ItemBromeliad growth and stoichiometry: responses to atmospheric nutrient supply in fog-dependent ecosystems of the hyper-arid Atacama Desert, Chile(2011) Gonzalez, Angelica L.; Miguel Farina, Jose; Pinto, Raquel; Perez, Cecilia; Weathers, Kathleen C.; Armesto, Juan J.; Marquet, Pablo A.Carbon, nitrogen, and phosphorus (C, N, P) stoichiometry influences the growth of plants and nutrient cycling within ecosystems. Indeed, elemental ratios are used as an index for functional differences between plants and their responses to natural or anthropogenic variations in nutrient supply. We investigated the variation in growth and elemental content of the rootless terrestrial bromeliad Tillandsia landbeckii, which obtains its moisture, and likely its nutrients, from coastal fogs in the Atacama Desert. We assessed (1) how fog nutrient supply influences plant growth and stoichiometry and (2) the response of plant growth and stoichiometry to variations in nutrient supply by using reciprocal transplants. We hypothesized that T. landbeckii should exhibit physiological and biochemical plastic responses commensurate with nutrient supply from atmospheric deposition. In the case of the Atacama Desert, nutrient supply from fog is variable over space and time, which suggests a relatively high variation in the growth and elemental content of atmospheric bromeliads. We found that the nutrient content of T. landbeckii showed high spatio-temporal variability, driven partially by fog nutrient deposition but also by plant growth rates. Reciprocal transplant experiments showed that transplanted individuals converged to similar nutrient content, growth rates, and leaf production of resident plants at each site, reflecting local nutrient availability. Although plant nutrient content did not exactly match the relative supply of N and P, our results suggest that atmospheric nutrient supply is a dominant driver of plant growth and stoichiometry. In fact, our results indicate that N uptake by T. landbeckii plants depends more on N supplied by fog, whereas P uptake is mainly regulated by within-plant nutrient demand for growth. Overall, these findings indicate that variation in fog nutrient supply exerts a strong control over growth and nutrient dynamics of atmospheric plants, which are ubiquitous across fog-dominated ecosystems.
- ItemCarbon fluxes from a temperate rainforest site in southern South America reveal a very sensitive sink(2018) Pérez Quezada, Jorge F.; Celis Diez, Juan Luis; Brito, Carla E.; Gaxiola Alcantar, Aurora; Núñez Ávila, Mariela; Pugnaire, Francisco I.; Armesto, Juan J.
- ItemChanging lenses to assess biodiversity: patterns of species richness in sub-Antarctic plants and implications for global conservation(2008) Rozzi, Ricardo.; Armesto, Juan J.
- ItemChilean long-term Socio-Ecological Research Network: progresses and challenges towards improving stewardship of unique ecosystems(2023) Frêne, Cristián; Armesto, Juan J.; Nespolo Rossi, Roberto; Gaxiola Alcantar, Aurora; Navarrete C., Sergio; Troncoso, Alejandra; Muñoz, Ariel; Corcuera, Luis J.Ecosystems provide a variety of benefits to human society and humanity’s utilization of ecosystems affects their composition, structure, and functions. Global change drivers demand us to study the interactions between ecological and social systems, and advise strategies to protect the large fraction of Chilean unique ecosystems. Long-term research and monitoring are vital for meaningful understanding of human impacts and socio-ecological feedback, which occur over multiple spatial and time-scales and can be invisible to traditional grant-sponsored short-term studies. Despite the large fraction of unique ecosystems, Chilean government agencies have not established long-term monitoring programs to inform and guide management decisions for use, conservation, and adaptation to climate change. Responding to this void, the Chilean Long-Term Socio-Ecological Research Network (LTSER-Chile) was created, comprising nine study sites funded by a variety of private and public institutions, that broadly seeks to understand how global change is altering biodiversity and ecosystem functions. The LTSER-Chile is currently in a phase of institutional consolidation to achieve its objectives of alignment with international efforts, fill the need for high-quality, long-term data on social, biological and physical components of Chilean ecosystems, and develop itself as an open research platform for the world. Despite the wide diversity of ecosystems ecncompased by LTSER-Chile sites, several common variables are monitored, especially climatic and hydrographic variables and many ecological indicator variables that consider temporal fluctuations, population and community dynamics. The main challenges currently facing the LTSER-Chile are to secure funding to maintain existing long-term monitoring programs, to persuade public and private decision-makers about its central role in informing and anticipating socio-ecological problems, and to achieve greater ecosystem representation by integrating new long-term study sites. This will require a more decisive political commitment of the State, to improve the stewardship of our unique terrestrial and marine ecosystems, and the realization that sound ecologically-sustainable policies will never be possible without a national monitoring network. We argue that the State should build on LTSER and several other private and university initiatives to provide the country with a monitoring network. In the absence of this commitment, the LTSER system is subject to discontinuity and frequent interruptions, which jeopardizes the long-term effort to understand the functioning of nature and its biodiversity.