Roxana Aragón

Roxana Aragón
National University of Tucuman | UNT · Instituto de Ecología Regional (IER)- CONICET

Dr

About

65
Publications
171,493
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1,508
Citations
Additional affiliations
March 2006 - April 2009
Facultad de Agronomia, Universidad de Buenos Aires
Position
  • Teaching asistant
April 2001 - present
National University of Tucuman
Position
  • Researcher
March 2001 - April 2007
Universidad de Buenos Aires
Position
  • PhD Student

Publications

Publications (65)
Article
Full-text available
Deadwood is a large global carbon store with its store size partially determined by biotic decay. Microbial wood decay rates are known to respond to changing temperature and precipitation. Termites are also important decomposers in the tropics but are less well studied. An understanding of their climate sensitivities is needed to estimate climate c...
Chapter
Full-text available
CAPITULO 7. YUNGAS. Las Yungas proveen múltiples recursos forestales madereros y no madereros de importancia regional, tienen una rol clave como proveedor de servicios ecosistémicos y albergan una extraordinaria biodiversidad. Con más de 3 millones de hectáreas en la actualidad, el 30% de las Yungas ha sido transformado a otros usos de la tierra y...
Preprint
Full-text available
Animals, such as termites, have largely been overlooked as global-scale drivers of biogeochemical cycles 1,2 , despite site-specific findings 3,4 . Deadwood turnover, an important component of the carbon cycle, is driven by multiple decay agents. Studies have focused on temperate systems 5,6 , where microbes dominate decay ⁷ . Microbial decay is se...
Article
Full-text available
en The “hierarchy of factors” hypothesis states that decomposition rates are controlled primarily by climatic, followed by biological and soil variables. Tropical montane forests (TMF) are globally important ecosystems, yet there have been limited efforts to provide a biome-scale characterization of litter decomposition. We designed a common litter...
Article
Questions It is well documented that invasive alien plants can reduce species richness and diversity and modify the composition of invaded communities. However, our knowledge on the impacts of invasive alien plants on the community functional structure and ecosystem properties and the mechanisms underlying these changes is more limited. We evaluate...
Article
Invasive plant species can alter litter decomposition rates through changes in litter quality, environment conditions and decomposer organisms (microflora and soil fauna) but limited research has examined the direct impact on soil fauna. We assessed the abundance and relative contribution of soil meso- and macrofauna to litter decomposition in inva...
Article
Full-text available
The amount of carbon stored in deadwood is equivalent to about 8 per cent of the global forest carbon stocks1. The decomposition of deadwood is largely governed by climate2–5 with decomposer groups—such as microorganisms and insects—contributing to variations in the decomposition rates2,6,7. At the global scale, the contribution of insects to the d...
Technical Report
Full-text available
This study, Larger than Jaguars: Inputs for a strategic approach to biodiversity conservation in Latin America and the Caribbean, is the operational response of the Wildlife Crisis Window, an integral part of the ‘EU Biodiversity for Life’ (B4Life) flagship initiative. B4Life is a conceptual framework to ensure better coherence and coordination of...
Conference Paper
Litter decomposition plays a central role in carbon and nutrient cycling, including ecosystem productivity, soil physicochemical properties, the structure of soil organism communities, and the dynamics of food webs. The "hierarchy of factors" hypothesis that states that on a global scale, decomposition rates are controlled primarily by climatic, fo...
Article
Full-text available
Ligustrum lucidum is a highly invasive East Asian tree that successfully colonizes several subtropical and temperate areas around the world. Its invasion capacity results from a widespread human use mostly in urban and periurban settings, very abundant fruit and seed production, small bird-dispersed fruits, high germination rates, resprouting capac...
Chapter
Full-text available
Los humedales son unidades claves en el funcionamiento ecosistémico de la Puna, en la cual el agua es un recurso limitante. Entre los principales tipos de humedales que se encuentran en la región se destacan los ríos, lagos, lagunas, salares y vegas. Estos ecosistemas tienen un alto valor de conservación porque son los principales proveedores de se...
Article
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El vasto territorio del Chaco Seco y el Espinal se consolida como uno de los centros globales de producción de granos y carne. Tanto por distintas normas legales y limitaciones productivas, como por causas culturales, el bosque nativo se preserva en grandes porciones y numerosos pequeños fragmentos inmersos en la matriz agrícola. Estos remanentes s...
Poster
Full-text available
El trabajo es parte de un proyecto en desarrollo cuyo objetivo es determinar si los remanentes de bosque de Chaco Seco inmersos en una matríz agrícola prestan servicios ecosistémicos, es decir, determinar si son funcionales ecológicamente. Para ello estamos cuantificando a través de un diseño de parcelas de Gasparri y Baldi (2013) adaptado a cada f...
Article
Full-text available
The delivery of ecosystem services, such as biotic pollination is a benefit that nature provides us. Pollinators increase the quantity, quality and stability of crops for food production. Previous works show that proximity to natural habitats increases crop production through the delivery of pollination services. However, similar researches in subt...
Article
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There are numerous maps of the spontaneous vegetation of Argentina. However, a country-level map with enough detail to discriminate vegetation units within the phytogeographic provinces described by Cabrera (1946) is lacking. We analyzed vegetation descriptions published in recent decades, with special attention to those that produced physiognomic-...
Article
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Existen numerosos mapas de la vegetación espontánea de la Argentina. Sin embargo, no contamos aún con uno de todo el país con una resolución que permita distinguir unidades de vegetación dentro de las provincias fitogeográficas descriptas por Cabrera (1976). Analizamos las descripciones de vegetación publicadas en las últimas décadas, con especial...
Article
Full-text available
ContextKnowing which factors determine the spread of plant invaders is a relevant issue in global ecology. Cultural landscapes both influence and are affected by exotic species. Although bioclimatic boundaries, seed sources and landscape configuration all control the invasion process, they have been mostly studied separately and independently from...
Article
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The impact of plant species invasions on the abundance, composition and activity of fungal decomposers of leaf litter is poorly understood. In this study, we isolated and compared the relative abundance of ligninocellulolytic fungi of leaf litter mixtures from a native forest and a forest invaded by Ligustrum lucidum in a lower mountain forest of T...
Article
Full-text available
Ligustrum lucidum, native of China, is one of the dominant exotic and invasive tree species in secondary forests in Argentina. 1) We assessed its invasion during 20 years in post-agricultural secondary forests dominated by native tree species, and 2) evaluated tree demographic rates of native individuals under and away from L. lucidum trees that in...
Article
Species loss and invasion of exotic species are two components of global biodiversity change that are expected to influence ecosystem functioning. Yet how they interact in natural settings remains unclear. Experiments have revealed two major mechanisms for the observed increase in primary productivity with plant species richness. Plant productivity...
Article
Full-text available
Evolutionary processes greatly impact the outcomes of biological invasions. An extensive body of research suggests that invasive populations often undergo phenotypic and ecological divergence from their native sources. Evolution also operates at different and distinct stages during the invasion process. Thus, it is important to incorporate evolutio...
Article
Gleditsia triacanthos L. is a woody species native to North America that has invaded Uruguay, Spain, Australia, South Africa and several countries of Central and Eastern Europe. In Argentina, it has become one of the most important invasive woody species and has a high potential to continue spreading. In this study, we review different aspects of G...
Conference Paper
Full-text available
El crecimiento de la población humana plantea el desafío de satisfacer sus demandas haciendo un uso eficiente y productivo de las tierras, tratando a la vez de mantener y conservar los ambientes naturales. En el Chaco Seco de Argentina, los remanentes lineales de bosque nativo se implementan como barreras contra factores erosivos y fuego. Pueden ac...
Research
An important tenet of biogeography and comparative ecology is that disjunct assemblages in similar physical environments are functionally more similar to each other than to assemblages from other environments. Temperate rainforests in South America, New Zealand and Australia share certain physiognomic similarities, but we are not aware of any stati...
Article
Full-text available
Abstract. Invasive plant species may benefit from a reduction in herbivory in their introduced range. The reduced herbivory may cause a reallocation of resources from defence to fitness. Here, we evaluated leaf herbivory of an invasive tree species (Ligustrum lucidum Aiton) in its native and novel ranges, and determined the potential changes in lea...
Article
Full-text available
Exotic species may influence the process of decomposition, either directly (through differences in the quality and/or quantity of leaf-litter) or indirectly (by altering microclimatic conditions and the abundance and/or activity of decomposers). The aims of our study were: I) to compare the decomposability of the most abundant exotic and native spe...
Article
Las especies exóticas pueden impactar en el proceso de descomposición, ya sea de manera directa (diferencias en calidad y/o cantidad de hojarasca) o de manera indirecta (modificando las condiciones micro ambientales y la abundancia y/o actividad de descomponedores). Los objetivos de este trabajo fueron: I) comparar la descomponibilidad de las espec...
Article
Full-text available
Alien success has frequently been associated with changes in the concentrations of soil nutrients. We aim to investigate the effects of plant invasion on soil nutrients, potential enzyme activity and litter elemental composition and stoichiometry. We compared stands of secondary forest invaded by Ligustrum lucidum and those dominated by natives, an...
Article
Ligustrum lucidum is the major exotic tree in NW Argentina montane forests (Yungas). To assess the effects of its expanding invasion on avian communities we (1) measured different habitat properties (vertical forest structure and composition, vegetation cover, light availability, air temperature, air relative humidity and soil litter depth), (2) co...
Article
Invasions of exotic tree species can cause profound changes in community composition and structure, and may even cause legacy effect on nutrient cycling via litter production. In this study, we compared leaf litter decomposition of two invasive exotic trees (Ligustrum lucidum and Morus sp.) and two dominant native trees (Cinnamomum porphyria and Cu...
Article
[1] Semiarid sedimentary plains occupied by dry forest ecosystems often display low groundwater recharge rates and accumulation of salts in the soil profile. The transformation of these natural systems to rain-fed agriculture has led to raising water tables and a slow, but steady, process of groundwater and soil salinization in vast areas of Austra...
Article
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Diversity often increases ecosystem functioning and enhances stability, but this relationship has been evaluated at the community scale and considering, for the most part, only species richness. Here, we explored the relationship between landscape diversity and either the coefficient of variation or the interannual standard deviation of greenness i...
Article
Grazing and fire have been the most common disturbances in many grasslands ecosystems for many centuries. However, some mountain regions are currently experiencing a decrease in land use, and therefore in frequency or intensity of these disturbances. In this study, we evaluated how fire and grazing affect vegetation structure in mountain grasslands...
Article
Sedimentary plains with extremely flat topography, such as the Pampas in Argentina, often display flooding–drought cycles. Changes in water table depth and surface water coverage affect natural and cultivated vegetation, wildlife, and people. Here, we describe groundwater dynamics and water-body expansion in a 10-year flooding cycle in the valuable...
Article
Full-text available
Resumen: En esta práctica se estudia el tegumento de los Vertebrados. Se identifican los derivados de origen epidérmico, dérmico o mixto. Palabras clave: Tegumento. Técnicas de estudio. Vertebrados. Derivados epidérmicos. Derivados dérmicos. OBJETIVOS Reconocer las estructuras tegumentarias homólogas. Diferenciar las adaptaciones tegumentarias. MAT...
Article
Full-text available
Resumen: En esta práctica se estudia el sistema nervioso de los Vertebrados. Se aprende la técnica de disección del encéfalo. Se estudia la anatomía comparada de las diferentes regiones del encéfalo y la relación con los órganos de los sentidos.
Article
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Resumen: En esta práctica se estudia el sistema urogenital de los Vertebrados. Se identifican las estructuras del sistema excretor y las estructuras del aparato genital para establecer las relaciones anatómicas entre los dos sistemas. Palabras clave: Sistema urogenital. Técnicas de estudio. Vertebrados. Sistema excretor. Aparato genital. Órganos ge...
Article
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Resumen: En esta práctica se estudiará el sistema muscular de los Vertebrados, analizando la estructura para definir las funciones y para realizar observaciones comparadas. Palabras clave: Sistema muscular. Técnicas. Músculos esqueléticos. Vertebrados. OBJETIVOS Reconocer la morfología muscular, teniendo en cuenta los conceptos teóricos vertidos en...
Article
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Resumen: En esta práctica se estudia el sistema circulatorio de los Vertebrados. Se analiza el desarrollo embrionario, se aprenden las técnicas de disección del corazón y se compara la anatomía del corazón en los distintos grupos de Vertebrados. Osteictios, Anfibios (sapo), Aves (pollo y ñandú) y Mamíferos (cerdo, gato y vaca). MATERIAL DE LABORATO...
Article
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Resumen: En esta práctica se estudia el sistema digestivo de los Vertebrados. Se reconoce la morfología del sistema digestivo y se estudian los tipos de dentición. Palabras clave: Sistema digestivo. Regionalización. Cavidad bucal. Dientes. Lengua. Glándulas anexas Alimentación. OBJETIVOS Reconocer la morfología del sistema digestivo y asociarla a l...
Article
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Resumen: En esta práctica se estudiarán los procesos del desarrollo embrionario temprano, haciendo hincapié en los estadios de blástula, gástrula y neúrula, en referencia a dos grupos de Vertebrados: Anfioxo y Anfibios.
Article
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Condrictios: (tiburón y raya), Osteíctios, Anfibios (anuros), Reptiles (lagarto, tortuga, víbora, caimán), Aves (gallina, ñandú), Mamíferos (perro, murciélago, armadillo) MATERIAL DE LABORATORIO Bandejas, lupas. Instrumental de disección.
Article
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Cráneos de anfibios anuros, reptiles (quelonios, saurios, ofidios, crocodilia), aves y mamíferos (perro, mono, ciervo, puma).
Article
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Resumen: En esta práctica se estudiarán los conceptos generales del esqueleto en Vertebrados. Técnicas para su estudio. Se definirán las partes del esqueleto y se desarrollarán las observaciones de los diferentes tipos de cráneos del esqueleto axial. Esqueleto completo diafanizado de: Condrictios (tiburón, raya), Osteictios (Lepidosirens sp, Carass...
Article
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Resumen: En esta práctica se estudiarán los primeros estadios del desarrollo embrionario y la disposición de los anexos extraembrionarios de Aves y Mamíferos. Inclusiones de huevos de pollo en diferentes etapas del desarrollo. Embriones conservados en alcohol de distintas especies de aves. Placentas conservadas en formol 10%. Fetos de cánidos y roe...
Article
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Although floods in watersheds have been associated with land-use change since ancient times, the dynamics of flooding is still incompletely understood. In this paper we explored the relations between rainfall, groundwater level, and cultivation to explain the dynamics of floods in the extremely flat and valuable arable lands of the Quinto river wat...
Article
Question: How are plant communities of the Flooding Pampa grasslands spatially distributed? How do canopy dynamics of the different communities vary among seasons and years?Location: Buenos Aires province, Argentina.Methods: We characterized the distribution of communities through a supervised classification based on four Landsat 5TM images. We sam...
Article
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Cool-season grasses establish symbioses with vertically transmitted Neotyphodium endophytes widespread in nature. The frequency of endophyte-infected plants in closed populations (i.e., without migrations) depends on both the differential fitness between infected and non-infected plants, and the endophyte-transmission efficiency. Most studies have...
Article
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In the last decades, South American ecosystems underwent important functional modifications due to climate alterations and direct human intervention on land use and land cover. Among remotely sensed data sets, NOAA-AVHRR "Normalized Difference Vegetation Index" (NDVI) represents one of the most powerful tools to evaluate these changes thanks to the...
Article
Question: What factors limit woody plant recruitment in a mosaic landscape where former agricultural lands are dominated by the invasive tree Ligustrum lucidum (Oleaceae)?Location: Subtropical northwestern Argentina.Methods: In secondary forest patches, we measured (1) tree, shrub and liana abundance in different size classes; (2) seed rain of Ligu...
Article
Successional patches are a large component of forest ecosystems throughout the world and their vegetation composition is conditioned by multiple factors such as land use history, disturbances, environmental conditions and landscape context. We investigated the relative contribution of historical, environmental, biotic and spatial factors in determi...
Article
Successional patches are a large component of forest ecosystems throughout the world and their vegetation composition is conditioned by multiple factors such as land use history, disturbances, environmental conditions and landscape context. We investigated the relative contribution of historical, environmental, biotic and spatial factors in determi...
Article
Full-text available
Currently biological invasions are considered one of the world's most serious conservation problems. Ligustrum lucidum is the most abundant exotic tree in secondary forest patches of montane forests of NW Argentina. We studied the determinants of success of the early stages of its life cycle in distinct habitat types, with the hope of identifying v...
Article
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Article
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We studied the effect of a road on bird movements at La Florida Provincial Reserve (Tucumán, Argentina). A road cuts the reserve leaving a forest fragment detached from the continuous forest. Understory birds were captured monthly for 12 months using 12-15 mist nets located in forest sites on both sides of the road, and birds crossing the road were...

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