1,720,988 research outputs found
Guía de campo para la restauración del bosque ribereño en el Delta del Paraná : basada en el protocolo de estrategias de conservación de la biodiversidad en bosques plantados de salicáceas del bajo Delta del Paraná
No full textLa región del Bajo Delta del Paraná constituye
una unidad natural de características biogeográ-
ficas y ecológicas únicas en la Argentina. En ella
confluyen especies de linaje subtropical (chaque-
ño y paranaense), como de las llanuras pampeana
y mesopotámica, de clima templado. Por ello,
numerosas especies vegetales que se consideran
autóctonas en este sitio provienen del norte siendo
transportadas por el Paraná y Ríos de Uruguay,
constituyendo muchas veces en el Delta el límite
austral de su distribución.EEA Delta del ParanáFil: Fracassi, Natalia. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Delta del Paraná; ArgentinaFil: Furman, Claudia. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Delta del Paraná; Argentin
Las Carabidae (Insecta, Coleoptera) de los suelos del Bajo Delta Bonaerense del Río Paraná : Estado actual de su conocimiento
No full textFil: Cicchino, Armando Conrado. División Entomología. Facultad de Ciencias Naturales y Museo. Universidad Nacional de La Plata; ArgentinaFil: Nanni, Analía S.. Instituto de Investigación e Ingeniería Ambiental. Universidad Nacional de San Martín; ArgentinaFil: Fracassi, Natalia G.. EEA INTA. Campana; ArgentinaFil: Quintana, Rubén D.. Laboratorio de Ecología Regional. Departamento de Ecología, Genética y Evolución. Facultad de Ciencias Exactas y Naturales. Universidad de Buenos Aires; Argentin
Nuevas especies de mamíferos para el Bajo Delta del Paraná y bajíos ribereños adyacentes, Buenos Aires, Argentina
Full text linkSe reportan los primeros registros de presencia para cuatro especies de mamíferos (Dasypus novemcinctus, Cerdocyon thous, Procyon cancrivorus y Axis axis) en el sector bonaerense del Bajo Delta del río Paraná y bajíos ribereños adyacentes, Argentina. La inexistencia de datos previos para estas especies en la zona, pese a que se trata de un área previamente bien relevada, sugiere que su ingreso habría sido reciente. El número de registros obtenidos, su dispersión en el área y las observaciones de los pobladores respecto de la frecuencia de avistajes sugerirían que estas especies poseen actualmente poblaciones establecidas en la zona.We report the first records of presence of four mammal species (Dasypus novemcinctus, Cerdocyon thous, Procyon cancrivorus, and Axis axis) for the Lower Delta of the Paraná river and adjacent coastal lowlands, Buenos Aires province, Argentina. The absence of previous records of these species in the area, although it is a previously well surveyed area, suggests that their dissemination would be recent. The obtained number of records, their dispersion in the area, and comments from local people regarding the frequency of sightings would suggest that these species currently have established populations in the area.EEA Delta del ParanáFil: Fracassi, Natalia. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Delta del Paraná; ArgentinaFil: Fracassi, Natalia. Asociación para la Conservación y el Estudio de la Naturaleza; ArgentinaFil: Moreyra, Pedro A. Administración de Parques Nacionales. Parque Nacional Campos del Tuyú; ArgentinaFil: Lartigau, Bernardo V. Asociación para la Conservación y el Estudio de la Naturaleza; ArgentinaFil: Teta, Pablo. Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”; ArgentinaFil: Landó, Roberto. FAPLAC S.A.; ArgentinaFil: Pereira, Javier A. Asociación para la Conservación y el Estudio de la Naturaleza; ArgentinaFil: Pereira, Javier A. Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”; Argentin
Conservation of the largest cervid of South America: interactions between people and the Vulnerable marsh deer Blastocerus dichotomus
Full text linkWild ungulates, and particularly deer, can cause severe damage to commercial plantations, resulting in reduced tolerance of their presence by forestry producers. The marsh deer Blastocerus dichotomus, categorized as Vulnerable on the IUCN Red List, is declining throughout South America. A population of c. 500 individuals survive within a matrix of commercial plantations in the lower delta of the Paraná River, the southernmost stronghold for the species. Local forestry producers usually report that damage to plantations is attributable to marsh deer, thus justifying persecution of the species. Seventy-six forestry producers (representing c. 33% of the total plantation area of the lower delta) were interviewed using a semi-structured questionnaire to assess perceived levels of tree damage, associated economic losses, and attitudes towards the deer. Simultaneously, plantation stands were surveyed to quantify the actual tree damage caused by this ungulate. Seventy-six percent of producers reported damage to trees by deer (i.e. browsing, fraying caused by antler rubbing) but most of them perceived low levels of damage per property (median < 0.2%), with negligible economic effects. However, 5% of producers (all of them with ≤ 2 km2 in production, usually family enterprises) perceived high levels of damage and economic losses, and supported deer hunting as a management option. Field surveys indicated that damage caused by deer could be more severe than perceived by producers, although spatially confined within the landscape. Monitoring of damage perception by forestry producers, and compensation schemes to assist small producers are necessary for adequate management of this threatened marsh deer population.Fil: Iezzi, María Eugenia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Biología Subtropical. Instituto de Biología Subtropical - Nodo Posadas | Universidad Nacional de Misiones. Instituto de Biología Subtropical. Instituto de Biología Subtropical - Nodo Posadas; ArgentinaFil: Fracassi, Natalia G.. Instituto Nacional de Tecnología Agropecuaria. Centro Regional Buenos Aires; ArgentinaFil: Pereira, Javier Adolfo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentin
Ground beetles (Coleoptera: Carabidae) inhabiting anthropogenic habitats in the lower delta of the Paraná river, Argentina: geographic distribution and ecological characteristics
Full text linkThe primary aim of this paper was to provide the first inventory of carabid beetles monthly collected in five different anthropogenic habitat types of the Lower Delta of the Paraná River, and to describe the main ecological characteristics, and to provide information on their distribution range in ecoregions, subregions and ecosystem complexes of Argentina and across the Neotropical region. Species were grouped considering six classes of distributions in relation to their presence in the Delta of the Paraná River. In addition, rarefaction curves were built in order to compare the seasonal species richness. We collected 1486 individuals belonging to 48 species. The southernmost distribution limit of 50% of the species is located south of the Delta region. Moreover, 21% of the species are confined to the Delta and Islands of the Parana and Uruguay Rivers ecoregion and to localities within the neighboring ecoregions of Espinal and Pampa. 63% of species were zoophagous and 25% were either omnivorous or seed eaters; 52% were hydrophilous, 44% mesophilous and one was xerophilous. The important number of species found in these ecoregion emphasizing its importance as a biodiversity hotspot of South American carabids. Human activities led to changes in the landscape of the Delta Islands which could favor the establishment of mesophilous and xerophilous species from other ecoregions. Seasonal carabid richness is higher in the warm seasons (spring and summer) respect to the cold (autumn and winter). Although, the highest absolute richness was found in the most anthropized habitat types, secondary forests had exclusive species, showing the importance of preserving the ecological mosaic of the landscape.Fil: Nanni, Analía Soledad. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de San Martín. Instituto de Investigación e Ingeniería Ambiental; ArgentinaFil: Quintana, Ruben Dario. Universidad Nacional de San Martín. Instituto de Investigación e Ingeniería Ambiental; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Fracassi, Natalia G.. Instituto Nacional de Tecnología Agropecuaria. Centro Regional Buenos Aires Norte. Estación Experimental Agropecuaria Delta del Paraná; ArgentinaFil: Cicchino, Armando Conrado. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Biodiversidad y Biotecnología. Grupo de Entomología Edáfica Bonaerense Suboriental - GENEBSO; Argentin
Espacios de conservación en los paisajes productivos
No full textUna gestión de la biodiversidad tendiente a lograr sistemas productivos sostenibles debe fundamentarse en prácticas agropecuarias que combinen acciones de manejo a escala de lote, sector, establecimiento y paisaje orientadas a mejorar tanto la biodiversidad planicada como la biodiversidad benéfica asociada.
Una forma de lograr esa calidad de manejo es a través de la conservación, restauración y/o creación de Una forma de lograr esa calidad de manejo es a través de la conservación, restauración y/o creación de espacios con flora nativa que desempeñen funciones
específicas para la biodiversidad. De este modo, se propenderá al diseño e implementación de agroecosistemas multifuncionales que permitan incrementar la sostenibilidad del sistema en su conjunto.
El presente artículo propone, como parte de la gestión de la biodiversidad en los agroecosistemas, la implementación de espacios de conservación. Como se detallará más adelante, esta propuesta contribuye al diseño de paisajes productivos con objetivos múltiples, que involucran a actores clave del territorio, funciones ecosistémicas y una diversidad de miradas para la provisión de servicios
ecosistémicos esenciales para la sociedad y el agro.Instituto de Recursos BiológicosFil: Fracassi, Natalia G. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Delta del Paraná; ArgentinaFil: Calamari, Noelia Cecilia. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Paraná; ArgentinaFil: Suarez, Romina Paula. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Recursos Biológicos; ArgentinaFil: Gavier Pizarro, Gregorio. Instituto Nacional de Tecnología Agropecuaria (INTA). Instituto de Fisiología y Recursos Genéticos Vegetales. ArgentinaFil: Somma, Daniel. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Delta del Paraná; Argentin
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Determinants of capybara presence in afforestations of the lower delta of the Paraná river, Argentina
Full text linkThe delta of the Paraná River in Argentina represents the southernmost stronghold for capybaras (Hydrochoerus hydrochaeris), but this area is highly modified due to commercial afforestations with Salicaceae. Water management (e.g. drainage of marshes) and land protections (e.g. polders) are carried out to improve field conditions for developing afforestations. To assess determinants of capybara presence within polder afforestations, its presence was surveyed in 2011?2013 along with 35 habitat and human-related variables at two spatial scales, in 53 watercourse-side sites. Using logistic regression, a habitat model was developed. Capybaras were present in 52.8% of sites. Water depth at the center of the watercourse had the strongest positive effect on capybara presence, followed by cover of reed marshes and cover of grass bush on the banks. Cover of adult poplar plantations showed a significant negative effect on capybara presence. Watercourses within polder afforestations can provide habitat for capybaras, although their use by these rodents depends on factors interacting at different scales.Fil: Fracassi, Natalia G.. Instituto Nacional de Tecnología Agropecuaria. Centro Regional Buenos Aires Norte. Estación Experimental Agropecuaria Delta del Paraná; ArgentinaFil: Buchter, Wendy M.. Universidad de Buenos Aires. Facultad de Agronomia. Departamento de Producción Vegetal. Cátedra de Dasonomia; ArgentinaFil: Pereira, Javier Adolfo. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales “Bernardino Rivadavia”; ArgentinaFil: Borodowski, Esteban D.. Universidad de Buenos Aires. Facultad de Agronomia. Departamento de Producción Vegetal. Cátedra de Dasonomia; ArgentinaFil: Somma, Daniel. Instituto Nacional de Tecnología Agropecuaria. Centro Regional Buenos Aires Norte. Estación Experimental Agropecuaria Pergamino; Argentin
Ground Beetles in a Changing World: Communities in a Modified Wetland Landscape
No full textWetlands are being increasingly affected by anthropogenic activities worldwide. The Lower Delta of the Paraná River, one of the most important wetlands in Argentina, has been profoundly altered because most of the natural environments were drained or diked to make them suitable for different agricultural activities. As a result, the landscape is characterized by a mosaic of Salicaceae afforestations of different ages interspersed with patches of secondary forests and grazing grasslands. The high susceptibility of Carabidae and Aphodiidae to natural and human-induced disturbances and management practices is reflected by changes in their spatiotemporal distribution. We performed a 1-year study to analyze and compare beetle’s communities inhabiting different habitat types in this modified wetland landscape. A total of 58 beetle species were recorded, of which 48 were carabids and 10 aphodids. Although species richness and diversity were higher in productive habitats (afforestations and grasslands) than in secondary forests, hydrophilic species were only found in the latter. Community parameters varied seasonally. Our results indicate a close relationship between wetland beetle communities and vegetation cover in each habitat type. Human activity increases heterogeneity across this landscape, which favors the colonization of new species but causes the loss or displacement of autochthonous species. The secondary forests could serve as alternative habitats for beetles typical of humid environments. We propose the maintenance of the current heterogeneous mosaic to favor the diversity of ground beetles and the implementation of changes in water management for the benefit of hydrophilic beetle species.EEA Delta del ParanáFil: Nanni, Analía Soledad. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de San Martín. Instituto de Investigación e Ingeniería Ambiental; ArgentinaFil: Fracassi, Natalia. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Delta del Paraná; ArgentinaFil: Magnano, Andrea Laura. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Investigaciones de las Zonas Áridas. Provincia de Mendoza. Instituto Argentino de Investigaciones de las Zonas Áridas. Universidad Nacional de Cuyo. Instituto Argentino de Investigaciones de las Zonas Áridas; ArgentinaFil: Cicchino, Armando Conrado. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones en Biodiversidad y Biotecnología. Grupo de Entomología Edáfica Bonaerense Suboriental - GENEBSO; ArgentinaFil: Quintana, Ruben Dario. Universidad Nacional de San Martín. Instituto de Investigación e Ingeniería Ambiental; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin
- …
