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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Alcaraz-Segura, D.; Paruelo, J. M.; Epstein, H. E.; Cabello, J.;

    127-154 The regional controls of biodiversity patterns have been traditionally evaluated using structural and compositional components at the species level, but evaluation of the functional component at the ecosystem level is still scarce. During the last decades, the role of ecosystem functioning in management and conservation has increased. Our aim was to use satellite-derived Ecosystem Functional Types (EFTs, patches of the land-surface with similar carbon gain dynamics) to characterize the regional patterns of ecosystem functional diversity and to evaluate the environmental and human controls that determine EFT richness across natural and human-modified systems in temperate South America. The EFT identification was based on three descriptors of carbon gain dynamics derived from seasonal curves of the MODIS Enhanced Vegetation Index (EVI) : annual mean (surrogate of primary production), seasonal coefficient of variation (indicator of seasonality) and date of maximum EVI (descriptor of phenology). As observed for species richness in the southern hemisphere, water availability, not energy, emerged as the main climatic driver ofEFT richness in natural areas of temperate South America. In anthropogenic areas, the role of both water and energy decreased and increasing human intervention increased richness at low levels of human influence, but decreased richness at high levels of human influence.

    image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ FAUBA Digital (UBA-F...arrow_drop_down
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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ FAUBA Digital (UBA-F...arrow_drop_down
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Baldassini, Pablo; Paruelo, José María; Lencinas, M. V.;

    Fil: Baldassini, Pablo. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina. Fil: Paruelo, José María. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina. La productividad primaria neta (PPN) se define como la tasa a la cual se acumula biomasa por unidad de área y de tiempo, y se la considera una variable integradora del funcionamiento de los ecosistemas. El desmonte y los cambios en el uso del suelo que afectan gran parte de la región del Chaco Semiárido pueden impactar sobre las ganancias totales de C y su estacionalidad. Trabajos previos en la región utilizan índices espectrales de vegetación como subrogado de la PPN. Sin embargo, arriban a resultados dispares y sólo se circunscriben a lo que sucede con la parte aérea (PPNA), sin considerar los cambios que ocurren en la porción subterránea (PPNS), que suele variar entre tipos fisonómicos de vegetación. Sobre la base del modelo de eficiencia en el uso de la radiación, de información espectral derivada de sensores remotos y de relaciones PPNS/PPN de la bibliografía, el objetivo de este trabajo fue cuantificar el efecto de la transformación en el uso y la cobertura del suelo sobre la PPN, y su variación estacional. En particular, se evaluó el cambio de la PPN en sistemas agrícolas y silvopastoriles con un componente leñoso variable, respecto del bosque original. En general, se observó que los usos del suelo que presentaban una mayor productividad aérea mostraban, al mismo tiempo, los menores niveles de productividad subterránea. El doble cultivo trigo-maíz presentó la mayor PPN total, significativamente superior a la de los sistemas silvopastoriles entre 5 y 25% de cobertura arbórea, y a los cultivos de trigo-soja y soja de primera. Sin embargo, su productividad no varió significativamente de la del bosque, las pasturas megatérmicas y el maíz de primera. Los resultados obtenidos no sólo aportan información sustancial para concluir cuantitativamente en términos de la magnitud del cambio en unidades de materia seca, sino que también permiten establecer un orden o ranking más apropiado de las coberturas y usos del suelo en cuanto a la productividad total. tbls., grafs., mapas

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      image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/ FAUBA Digital (UBA-F...arrow_drop_down
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  • image/svg+xml art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos Open Access logo, converted into svg, designed by PLoS. This version with transparent background. http://commons.wikimedia.org/wiki/File:Open_Access_logo_PLoS_white.svg art designer at PLoS, modified by Wikipedia users Nina, Beao, JakobVoss, and AnonMoos http://www.plos.org/
    Authors: Baldi, Germán; Texeira, Marcos; Murray, Francisco; Jobbágy, Esteban G.;

    The dry subtropics are subject to a rapid expansion of crops and pastures over vast areas of natural woodlands and savannas. In this paper, we explored the effect of this transformation on vegetation productivity (magnitude, and seasonal and long-term variability) along aridity gradients which span from semiarid to subhumid conditions, considering exclusively those areas with summer rains (>66%). Vegetation productivity was characterized with the proxy metric "Enhanced Vegetation Index" (EVI) (2000 to 2012 period), on 6186 natural and cultivated sampling points on five continents, and combined with a global climatology database by means of additive models for quantile regressions. Globally and regionally, cultivation amplified the seasonal and inter-annual variability of EVI without affecting its magnitude. Natural and cultivated systems maintained a similar and continuous increase of EVI with increasing water availability, yet achieved through contrasting ways. In natural systems, the productivity peak and the growing season length displayed concurrent steady increases with water availability, while in cultivated systems the productivity peak increased from semiarid to dry-subhumid conditions, and stabilized thereafter giving place to an increase in the growing season length towards wetter conditions. Our results help to understand and predict the ecological impacts of deforestation on vegetation productivity, a key ecosystem process linked to a broad range of services. Fil: Baldi, Germán. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis. Instituto de Matemática Aplicada de San Luis "Prof. Ezio Marchi". Universidad Nacional de San Luis. Facultad de Ciencias Físico, Matemáticas y Naturales. Instituto de Matemática Aplicada de San Luis "Prof. Ezio Marchi"; Argentina Fil: Texeira González, Marcos Alexis. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura. Universidad de Buenos Aires. Facultad de Agronomía; Argentina Fil: Murray, Francisco. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis. Instituto de Matemática Aplicada de San Luis "Prof. Ezio Marchi". Universidad Nacional de San Luis. Facultad de Ciencias Físico, Matemáticas y Naturales. Instituto de Matemática Aplicada de San Luis "Prof. Ezio Marchi"; Argentina. Instituto Nacional de Tecnología Agropecuaria; Argentina Fil: Jobbagy Gampel, Esteban Gabriel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis. Instituto de Matemática Aplicada de San Luis "Prof. Ezio Marchi". Universidad Nacional de San Luis. Facultad de Ciencias Físico, Matemáticas y Naturales. Instituto de Matemática Aplicada de San Luis "Prof. Ezio Marchi"; Argentina

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      CONICET Digital
      Article . 2016
      Data sources: CONICET Digital
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    Authors: Pettorelli, Nathalie; Nagendra, Harini; Rocchini, Duccio; Rowcliffe, Marcus; +25 Authors

    In 2014, Wiley and the Zoological Society of London launched Remote Sensing in Ecology and Conservation, an open-access journal that aims to support communication and collaboration among experts in remote sensing, ecology and conservation science. Remote sensing was from the start understood as the acquisition of information about an object or phenomenon through a device that is not in physical contact with the object, thus including camera traps, field spectrometry, terrestrial and aquatic acoustic sensors, aerial and satellite monitoring as well as ship-borne automatic identification systems. The primary goals of this new journal were, and still are, to maximize the understanding and uptake of remote sensing-based techniques and products by the ecological and conservation communities, prioritizing findings that advance the scientific basis of, and applied outcomes from, ecology and conservation science; and to identify ecological challenges that might direct development of future remote sensors and data products. In October 2015, the first issue of the journal was published, with four other issues produced in 2016 and four to be published in 2017. As Remote Sensing in Ecology and Conservation is about to complete its second full year of publication and is working towards a first impact factor score in early 2019, the time has come to reflect on how the journal has done to date, what impact it has had, which niches it has successfully filled and where the journal is yet to meet its full potential. By sharing our successes and experiences so far with our contributors and readers, we hope to demonstrate how Remote Sensing in Ecology and Conservation has swiftly gained significant visibility and status among scientists and practitioners interested in natural resource management. Fil: Pettorelli, Nathalie. The Zoological Society Of London; Reino Unido Fil: Nagendra, Harini. Azim Premji University; India Fil: Rocchini, Duccio. Università Degli Studi Di Trento; Italia Fil: Rowcliffe, Marcus. The Zoological Society Of London; Reino Unido Fil: Williams, Rob. Oceans Initiative; Estados Unidos Fil: Ahumada, Jorge. Conservation International; Estados Unidos Fil: de Angelo, Carlos Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Biología Subtropical. Instituto de Biología Subtropical - Nodo Puerto Iguazú | Universidad Nacional de Misiones. Instituto de Biología Subtropical. Instituto de Biología Subtropical - Nodo Puerto Iguazú; Argentina Fil: Atzberger, Clement. Universitat Fur Bodenkultur Wien; Austria Fil: Boyd, Doreen. Science and Technology Facilities Council of Nottingham. Rutherford Appleton Laboratory; Reino Unido. University of Nottingham; Estados Unidos Fil: Buchanan, Graeme. Royal Society For The Protection Of Birds; Reino Unido Fil: Chauvenet, Alienor. University of Queensland; Australia Fil: Disney, Mathias. Colegio Universitario de Londres; Reino Unido Fil: Duncan, Clare. Deakin University; Australia Fil: Fatoyinbo, Temilola. NASA Goddard Space Flight Center; Estados Unidos Fil: Fernandez, Nestor. Consejo Superior de Investigaciones Científicas. Estación Biológica de Doñana; España Fil: Haklay, Muki. Colegio Universitario de Londres; Reino Unido Fil: He, Kate. Murray State University Murray; Estados Unidos Fil: Horning, Ned. American Museum of Natural History; Estados Unidos Fil: Kelly, Natalie. Australian Antarctic Division; Australia Fil: de Klerk, Helen. Stellenbosch University; Sudáfrica Fil: Liu, Xuehua. Tsinghua University; China Fil: Merchant, Nathan. Centre for Environment, Fisheries and Aquaculture Science; Reino Unido Fil: Paruelo, José. Universidad de Buenos Aires; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Roy, Helen. NERC Centre for Ecology & Hydrology; Reino Unido Fil: Roy, Shovonlal. University of Reading; Reino Unido Fil: Ryan, Sadie. University of Florida; Estados Unidos Fil: Sollmann, Rahel. University of California at Davis; Estados Unidos Fil: Swenson, Jennifer. University of Duke; Estados Unidos Fil: Wegmann, Martin. Universität Würzburg; Alemania

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    CONICET Digital
    Article . 2017
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    UCL Discovery
    Article . 2017
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    Authors: Alcaraz-Segura, D.; Liras, E.; Tabik, S.; Paruelo, J.; +1 Authors

    Successive efforts have processed the Advanced Very High Resolution Radiometer (AVHRR) sensor archive to produce Normalized Difference Vegetation Index (NDVI) datasets (i.e., PAL, FASIR, GIMMS, and LTDR) under different corrections and processing schemes. Since NDVI datasets are used to evaluate carbon gains, differences among them may affect nations' carbon budgets in meeting international targets (such as the Kyoto Protocol). This study addresses the consistency across AVHRR NDVI datasets in the Iberian Peninsula (Spain and Portugal) by evaluating whether their 1982-1999 NDVI trends show similar spatial patterns. Significant trends were calculated with the seasonal Mann- Kendall trend test and their spatial consistency with partial Mantel tests. Over 23% of the Peninsula (N, E, and central mountain ranges) showed positive and significant NDVI trends across the four datasets and an additional 18% across three datasets. In 20% of Iberia (SW quadrant), the four datasets exhibited an absence of significant trends and an additional 22% across three datasets. Significant NDVI decreases were scarce (croplands in the Guadalquivir and Segura basins, La Mancha plains, and Valencia). Spatial consistency of significant trends across at least three datasets was observed in 83% of the Peninsula, but it decreased to 47% when comparing across the four datasets. FASIR, PAL, and LTDR were the most spatially similar datasets, while GIMMS was the most different. The different performance of each AVHRR dataset to detect significant NDVI trends (e.g., LTDR detected greater significant trends (both positive and negative) and in 32% more pixels than GIMMS) has great implications to evaluate carbon budgets. The lack of spatial consistency across NDVI datasets derived from the same AVHRR sensor archive, makes it advisable to evaluate carbon gains trends using several satellite datasets and, whether possible, independent/additional data sources to contrast. Fil: Alcaraz Segura, Domingo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura; Argentina. Universidad de Almería; España Fil: Liras, Elisa. Universidad de Almería; España Fil: Tabik, Siham. Universidad de Málaga; España Fil: Paruelo, José. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura; Argentina Fil: Cabello, Javier. Universidad de Almería; España

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    Sensors
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    Sensors
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    Authors: López-Mársico, Luis; Oyarzabal, Mariano; Altesor, Alice; Paruelo, José María;

    El pastoreo afecta directamente a la parte aérea de la vegetación, e indirectamente a la subterránea. En los pastizales existe un conocimiento escaso del efecto del pastoreo sobre la productividad primaria neta subterránea (PPNS). Nuestro objetivo fue cuantificar el efecto del pastoreo sobre la PPNS hasta 25 cm de profundidad en un pastizal de la región centro-sur de Uruguay, en cuatro períodos de muestreo distribuidos uniformemente a lo largo de un año. Al inicio de cada período se realizaron cinco pozos cilíndricos de 5 cm de diámetro x 25 cm de profundidad en tres áreas clausuradas de entre 4 y 17 años de antigüedad, y en sus áreas pastoreadas adyacentes. Se colocaron mallas plásticas cilíndricas, se rellenaron con suelo libre de raíces, se extrajeron al cabo de tres meses y se fraccionaron en tres profundidades (0-5, 5-10 y 10-25 cm). La PPNS anual para el perfil de 25 cm fue 41% mayor en las áreas pastoreadas (505 g.m -2.año -1) que en las clausuradas (357 g.m -2.año -1). La PPNS anual disminuyó con la profundidad del suelo de manera similar en las áreas pastoreadas y clausuradas. La mitad de la PPNS anual de todo el perfil estuvo concentrada en las primeras dos fracciones (0-5 y 5-10 cm). Para el perfil completo de 25 cm, la PPNS presentó una interacción pastoreo x período de muestreo marginalmente significativa, lo cual indica trayectorias diferentes de la PPNS. Nuestro estudio es uno de los pocos que evalúa el efecto del pastoreo sobre la PPNS en pastizales del Río de la Plata y es el primero que lo hace por medio de la técnica de mallas cilíndricas. Cuantificar el efecto del pastoreo sobre la PPNS permite entender la dinámica de secuestro de C en el suelo, un servicio ecosistémico de gran valor que aportan los pastizales. Grazing directly affects above-ground fraction of vegetation and indirectly the below-ground part. There is a poor knowledge of the effect of grazing on below-ground net primary productivity (BNPP) in grasslands. Our aim was to quantify the effect of grazing on BNPP up to 25 cm depth in a south-central Uruguayan grassland, in four sampling periods, distributed uniformly throughout a year. At the beginning of each period, five cylindrical holes of 5 cm diameter x 25 cm depth, in three exclosures sites aged between 4 and 17 years, and at their adjacent grazed areas, were performed. Ingrowth cores filled with free roots soil were placed in the hole, extracted after three months and divided in 3 depths (0-5, 5-10 and 10-25 cm). For 25 cm profile, the annual BNPP was 41% higher in grazed areas (532 g.m-2.year-1) than in exclosures areas (376 g.m-2.year-1). The annual BNPP decreased with soil depth similarly at grazed and exclosures areas. Half of the annual BNPP of whole profile was concentrated in the two shallowest layers (0-5 and 5-10 cm). BNPP for the profile of 25 cm presented interaction grazing x sampling periods marginally significant, indicating different trajectories of BNPP. This study is one of the few in the Río de la Plata grasslands that assesses the effect of grazing on BNPP and the first using ingrowth cores. Quantifying the effect of grazing on BNPP allows understanding the dynamics of C sequestration in the soil, an ecosystem service particularly valued in grasslands. Fil: Lopez Mársico, Luis. Universidad de la República. Facultad de Ciencias; Uruguay Fil: Oyarzabal, Mariano. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura. Universidad de Buenos Aires. Facultad de Agronomía. Departamento de Métodos Cuantitativos y Sistemas de Información; Argentina Fil: Altesor, Alice. Universidad de la República. Facultad de Ciencias; Uruguay Fil: Paruelo, José. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura. Universidad de Buenos Aires. Facultad de Agronomía. Departamento de Métodos Cuantitativos y Sistemas de Información; Argentina. Universidad de la República. Facultad de Ciencias; Uruguay

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    DOAJ
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    Ecología Austral
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    Authors: Alcaraz-Segura, D.; Paruelo, J. M.; Epstein, H. E.; Cabello, J.;

    127-154 The regional controls of biodiversity patterns have been traditionally evaluated using structural and compositional components at the species level, but evaluation of the functional component at the ecosystem level is still scarce. During the last decades, the role of ecosystem functioning in management and conservation has increased. Our aim was to use satellite-derived Ecosystem Functional Types (EFTs, patches of the land-surface with similar carbon gain dynamics) to characterize the regional patterns of ecosystem functional diversity and to evaluate the environmental and human controls that determine EFT richness across natural and human-modified systems in temperate South America. The EFT identification was based on three descriptors of carbon gain dynamics derived from seasonal curves of the MODIS Enhanced Vegetation Index (EVI) : annual mean (surrogate of primary production), seasonal coefficient of variation (indicator of seasonality) and date of maximum EVI (descriptor of phenology). As observed for species richness in the southern hemisphere, water availability, not energy, emerged as the main climatic driver ofEFT richness in natural areas of temperate South America. In anthropogenic areas, the role of both water and energy decreased and increasing human intervention increased richness at low levels of human influence, but decreased richness at high levels of human influence.

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    Authors: Baldassini, Pablo; Paruelo, José María; Lencinas, M. V.;

    Fil: Baldassini, Pablo. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina. Fil: Paruelo, José María. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina. La productividad primaria neta (PPN) se define como la tasa a la cual se acumula biomasa por unidad de área y de tiempo, y se la considera una variable integradora del funcionamiento de los ecosistemas. El desmonte y los cambios en el uso del suelo que afectan gran parte de la región del Chaco Semiárido pueden impactar sobre las ganancias totales de C y su estacionalidad. Trabajos previos en la región utilizan índices espectrales de vegetación como subrogado de la PPN. Sin embargo, arriban a resultados dispares y sólo se circunscriben a lo que sucede con la parte aérea (PPNA), sin considerar los cambios que ocurren en la porción subterránea (PPNS), que suele variar entre tipos fisonómicos de vegetación. Sobre la base del modelo de eficiencia en el uso de la radiación, de información espectral derivada de sensores remotos y de relaciones PPNS/PPN de la bibliografía, el objetivo de este trabajo fue cuantificar el efecto de la transformación en el uso y la cobertura del suelo sobre la PPN, y su variación estacional. En particular, se evaluó el cambio de la PPN en sistemas agrícolas y silvopastoriles con un componente leñoso variable, respecto del bosque original. En general, se observó que los usos del suelo que presentaban una mayor productividad aérea mostraban, al mismo tiempo, los menores niveles de productividad subterránea. El doble cultivo trigo-maíz presentó la mayor PPN total, significativamente superior a la de los sistemas silvopastoriles entre 5 y 25% de cobertura arbórea, y a los cultivos de trigo-soja y soja de primera. Sin embargo, su productividad no varió significativamente de la del bosque, las pasturas megatérmicas y el maíz de primera. Los resultados obtenidos no sólo aportan información sustancial para concluir cuantitativamente en términos de la magnitud del cambio en unidades de materia seca, sino que también permiten establecer un orden o ranking más apropiado de las coberturas y usos del suelo en cuanto a la productividad total. tbls., grafs., mapas

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    Ecología Austral
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    Authors: Baldi, Germán; Texeira, Marcos; Murray, Francisco; Jobbágy, Esteban G.;

    The dry subtropics are subject to a rapid expansion of crops and pastures over vast areas of natural woodlands and savannas. In this paper, we explored the effect of this transformation on vegetation productivity (magnitude, and seasonal and long-term variability) along aridity gradients which span from semiarid to subhumid conditions, considering exclusively those areas with summer rains (>66%). Vegetation productivity was characterized with the proxy metric "Enhanced Vegetation Index" (EVI) (2000 to 2012 period), on 6186 natural and cultivated sampling points on five continents, and combined with a global climatology database by means of additive models for quantile regressions. Globally and regionally, cultivation amplified the seasonal and inter-annual variability of EVI without affecting its magnitude. Natural and cultivated systems maintained a similar and continuous increase of EVI with increasing water availability, yet achieved through contrasting ways. In natural systems, the productivity peak and the growing season length displayed concurrent steady increases with water availability, while in cultivated systems the productivity peak increased from semiarid to dry-subhumid conditions, and stabilized thereafter giving place to an increase in the growing season length towards wetter conditions. Our results help to understand and predict the ecological impacts of deforestation on vegetation productivity, a key ecosystem process linked to a broad range of services. Fil: Baldi, Germán. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis. Instituto de Matemática Aplicada de San Luis "Prof. Ezio Marchi". Universidad Nacional de San Luis. Facultad de Ciencias Físico, Matemáticas y Naturales. Instituto de Matemática Aplicada de San Luis "Prof. Ezio Marchi"; Argentina Fil: Texeira González, Marcos Alexis. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura. Universidad de Buenos Aires. Facultad de Agronomía; Argentina Fil: Murray, Francisco. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis. Instituto de Matemática Aplicada de San Luis "Prof. Ezio Marchi". Universidad Nacional de San Luis. Facultad de Ciencias Físico, Matemáticas y Naturales. Instituto de Matemática Aplicada de San Luis "Prof. Ezio Marchi"; Argentina. Instituto Nacional de Tecnología Agropecuaria; Argentina Fil: Jobbagy Gampel, Esteban Gabriel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Luis. Instituto de Matemática Aplicada de San Luis "Prof. Ezio Marchi". Universidad Nacional de San Luis. Facultad de Ciencias Físico, Matemáticas y Naturales. Instituto de Matemática Aplicada de San Luis "Prof. Ezio Marchi"; Argentina

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      PLoS ONE
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      Article . 2016
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      Article . 2016
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      CONICET Digital
      Article . 2016
      Data sources: CONICET Digital
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    Authors: Pettorelli, Nathalie; Nagendra, Harini; Rocchini, Duccio; Rowcliffe, Marcus; +25 Authors

    In 2014, Wiley and the Zoological Society of London launched Remote Sensing in Ecology and Conservation, an open-access journal that aims to support communication and collaboration among experts in remote sensing, ecology and conservation science. Remote sensing was from the start understood as the acquisition of information about an object or phenomenon through a device that is not in physical contact with the object, thus including camera traps, field spectrometry, terrestrial and aquatic acoustic sensors, aerial and satellite monitoring as well as ship-borne automatic identification systems. The primary goals of this new journal were, and still are, to maximize the understanding and uptake of remote sensing-based techniques and products by the ecological and conservation communities, prioritizing findings that advance the scientific basis of, and applied outcomes from, ecology and conservation science; and to identify ecological challenges that might direct development of future remote sensors and data products. In October 2015, the first issue of the journal was published, with four other issues produced in 2016 and four to be published in 2017. As Remote Sensing in Ecology and Conservation is about to complete its second full year of publication and is working towards a first impact factor score in early 2019, the time has come to reflect on how the journal has done to date, what impact it has had, which niches it has successfully filled and where the journal is yet to meet its full potential. By sharing our successes and experiences so far with our contributors and readers, we hope to demonstrate how Remote Sensing in Ecology and Conservation has swiftly gained significant visibility and status among scientists and practitioners interested in natural resource management. Fil: Pettorelli, Nathalie. The Zoological Society Of London; Reino Unido Fil: Nagendra, Harini. Azim Premji University; India Fil: Rocchini, Duccio. Università Degli Studi Di Trento; Italia Fil: Rowcliffe, Marcus. The Zoological Society Of London; Reino Unido Fil: Williams, Rob. Oceans Initiative; Estados Unidos Fil: Ahumada, Jorge. Conservation International; Estados Unidos Fil: de Angelo, Carlos Daniel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Biología Subtropical. Instituto de Biología Subtropical - Nodo Puerto Iguazú | Universidad Nacional de Misiones. Instituto de Biología Subtropical. Instituto de Biología Subtropical - Nodo Puerto Iguazú; Argentina Fil: Atzberger, Clement. Universitat Fur Bodenkultur Wien; Austria Fil: Boyd, Doreen. Science and Technology Facilities Council of Nottingham. Rutherford Appleton Laboratory; Reino Unido. University of Nottingham; Estados Unidos Fil: Buchanan, Graeme. Royal Society For The Protection Of Birds; Reino Unido Fil: Chauvenet, Alienor. University of Queensland; Australia Fil: Disney, Mathias. Colegio Universitario de Londres; Reino Unido Fil: Duncan, Clare. Deakin University; Australia Fil: Fatoyinbo, Temilola. NASA Goddard Space Flight Center; Estados Unidos Fil: Fernandez, Nestor. Consejo Superior de Investigaciones Científicas. Estación Biológica de Doñana; España Fil: Haklay, Muki. Colegio Universitario de Londres; Reino Unido Fil: He, Kate. Murray State University Murray; Estados Unidos Fil: Horning, Ned. American Museum of Natural History; Estados Unidos Fil: Kelly, Natalie. Australian Antarctic Division; Australia Fil: de Klerk, Helen. Stellenbosch University; Sudáfrica Fil: Liu, Xuehua. Tsinghua University; China Fil: Merchant, Nathan. Centre for Environment, Fisheries and Aquaculture Science; Reino Unido Fil: Paruelo, José. Universidad de Buenos Aires; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Roy, Helen. NERC Centre for Ecology & Hydrology; Reino Unido Fil: Roy, Shovonlal. University of Reading; Reino Unido Fil: Ryan, Sadie. University of Florida; Estados Unidos Fil: Sollmann, Rahel. University of California at Davis; Estados Unidos Fil: Swenson, Jennifer. University of Duke; Estados Unidos Fil: Wegmann, Martin. Universität Würzburg; Alemania

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    CONICET Digital
    Article . 2017
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    UCL Discovery
    Article . 2017
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    Authors: Alcaraz-Segura, D.; Liras, E.; Tabik, S.; Paruelo, J.; +1 Authors

    Successive efforts have processed the Advanced Very High Resolution Radiometer (AVHRR) sensor archive to produce Normalized Difference Vegetation Index (NDVI) datasets (i.e., PAL, FASIR, GIMMS, and LTDR) under different corrections and processing schemes. Since NDVI datasets are used to evaluate carbon gains, differences among them may affect nations' carbon budgets in meeting international targets (such as the Kyoto Protocol). This study addresses the consistency across AVHRR NDVI datasets in the Iberian Peninsula (Spain and Portugal) by evaluating whether their 1982-1999 NDVI trends show similar spatial patterns. Significant trends were calculated with the seasonal Mann- Kendall trend test and their spatial consistency with partial Mantel tests. Over 23% of the Peninsula (N, E, and central mountain ranges) showed positive and significant NDVI trends across the four datasets and an additional 18% across three datasets. In 20% of Iberia (SW quadrant), the four datasets exhibited an absence of significant trends and an additional 22% across three datasets. Significant NDVI decreases were scarce (croplands in the Guadalquivir and Segura basins, La Mancha plains, and Valencia). Spatial consistency of significant trends across at least three datasets was observed in 83% of the Peninsula, but it decreased to 47% when comparing across the four datasets. FASIR, PAL, and LTDR were the most spatially similar datasets, while GIMMS was the most different. The different performance of each AVHRR dataset to detect significant NDVI trends (e.g., LTDR detected greater significant trends (both positive and negative) and in 32% more pixels than GIMMS) has great implications to evaluate carbon budgets. The lack of spatial consistency across NDVI datasets derived from the same AVHRR sensor archive, makes it advisable to evaluate carbon gains trends using several satellite datasets and, whether possible, independent/additional data sources to contrast. Fil: Alcaraz Segura, Domingo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura; Argentina. Universidad de Almería; España Fil: Liras, Elisa. Universidad de Almería; España Fil: Tabik, Siham. Universidad de Málaga; España Fil: Paruelo, José. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura; Argentina Fil: Cabello, Javier. Universidad de Almería; España

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    Authors: López-Mársico, Luis; Oyarzabal, Mariano; Altesor, Alice; Paruelo, José María;

    El pastoreo afecta directamente a la parte aérea de la vegetación, e indirectamente a la subterránea. En los pastizales existe un conocimiento escaso del efecto del pastoreo sobre la productividad primaria neta subterránea (PPNS). Nuestro objetivo fue cuantificar el efecto del pastoreo sobre la PPNS hasta 25 cm de profundidad en un pastizal de la región centro-sur de Uruguay, en cuatro períodos de muestreo distribuidos uniformemente a lo largo de un año. Al inicio de cada período se realizaron cinco pozos cilíndricos de 5 cm de diámetro x 25 cm de profundidad en tres áreas clausuradas de entre 4 y 17 años de antigüedad, y en sus áreas pastoreadas adyacentes. Se colocaron mallas plásticas cilíndricas, se rellenaron con suelo libre de raíces, se extrajeron al cabo de tres meses y se fraccionaron en tres profundidades (0-5, 5-10 y 10-25 cm). La PPNS anual para el perfil de 25 cm fue 41% mayor en las áreas pastoreadas (505 g.m -2.año -1) que en las clausuradas (357 g.m -2.año -1). La PPNS anual disminuyó con la profundidad del suelo de manera similar en las áreas pastoreadas y clausuradas. La mitad de la PPNS anual de todo el perfil estuvo concentrada en las primeras dos fracciones (0-5 y 5-10 cm). Para el perfil completo de 25 cm, la PPNS presentó una interacción pastoreo x período de muestreo marginalmente significativa, lo cual indica trayectorias diferentes de la PPNS. Nuestro estudio es uno de los pocos que evalúa el efecto del pastoreo sobre la PPNS en pastizales del Río de la Plata y es el primero que lo hace por medio de la técnica de mallas cilíndricas. Cuantificar el efecto del pastoreo sobre la PPNS permite entender la dinámica de secuestro de C en el suelo, un servicio ecosistémico de gran valor que aportan los pastizales. Grazing directly affects above-ground fraction of vegetation and indirectly the below-ground part. There is a poor knowledge of the effect of grazing on below-ground net primary productivity (BNPP) in grasslands. Our aim was to quantify the effect of grazing on BNPP up to 25 cm depth in a south-central Uruguayan grassland, in four sampling periods, distributed uniformly throughout a year. At the beginning of each period, five cylindrical holes of 5 cm diameter x 25 cm depth, in three exclosures sites aged between 4 and 17 years, and at their adjacent grazed areas, were performed. Ingrowth cores filled with free roots soil were placed in the hole, extracted after three months and divided in 3 depths (0-5, 5-10 and 10-25 cm). For 25 cm profile, the annual BNPP was 41% higher in grazed areas (532 g.m-2.year-1) than in exclosures areas (376 g.m-2.year-1). The annual BNPP decreased with soil depth similarly at grazed and exclosures areas. Half of the annual BNPP of whole profile was concentrated in the two shallowest layers (0-5 and 5-10 cm). BNPP for the profile of 25 cm presented interaction grazing x sampling periods marginally significant, indicating different trajectories of BNPP. This study is one of the few in the Río de la Plata grasslands that assesses the effect of grazing on BNPP and the first using ingrowth cores. Quantifying the effect of grazing on BNPP allows understanding the dynamics of C sequestration in the soil, an ecosystem service particularly valued in grasslands. Fil: Lopez Mársico, Luis. Universidad de la República. Facultad de Ciencias; Uruguay Fil: Oyarzabal, Mariano. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura. Universidad de Buenos Aires. Facultad de Agronomía. Departamento de Métodos Cuantitativos y Sistemas de Información; Argentina Fil: Altesor, Alice. Universidad de la República. Facultad de Ciencias; Uruguay Fil: Paruelo, José. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura. Universidad de Buenos Aires. Facultad de Agronomía. Departamento de Métodos Cuantitativos y Sistemas de Información; Argentina. Universidad de la República. Facultad de Ciencias; Uruguay

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    Ecología Austral
    Article . 2016 . Peer-reviewed
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    Ecología Austral
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