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| Registros recuperados: 734 | |
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| Maidana,Nora I; Seeligmann,Claudia T. |
| En el marco de la investigación de humedales de alta montaña que realizamos desde 1998, hemos estudiado ya 24 cuerpos de agua de esta provincia. Con el objetivo de ampliar los conocimientos de la flora diatomológica en ambientes de alta montaña, en esta oportunidad analizamos otros 12 humedales ubicados entre los 25°34’05’’-27°39’23’’ S, a más de 3000 m snm. Encontramos diatomeas en todas las muestras, excepto en la de la laguna Azul, que es casi blanca por la gran cantidad de sólidos en suspensión. En relación a la salinidad, las aguas fueron desde dulces hasta hipersalinas, con predominio de los iones sodio y cloruro. Identificamos, excluyendo las Fragilariaceae, 42 géneros con 123 taxones... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Diatomeas; Humedales; Andes; Catamarca; Argentina. |
| Ano: 2015 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-23722015000400003 |
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| Pirk,Gabriela I. |
| Natural disturbances are important components of ecosystem dynamics. Large scale disturbances produced by volcanoes, have been poorly studied because of their low frequency, the lack of baseline studies due to their unpredictability, the impossibility of replication, and the difficulty of conducting long-term studies to monitor ecosystem recovery. The recent eruption of the Puyehue-Cordón Caulle volcanic complex (June 2011), which produced an ash fall covering 24 million ha of Patagonia, provides a unique opportunity of studying this type of disturbance in areas with baseline data. The summer before the ash fall (2011) ant communities were characterized in areas of the Patagonian steppe which were later covered with 4 cm of fine ash. The aim of this study... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Argentina; Desert; Formicidae; Natural disturbance; Volcanic eruption. |
| Ano: 2014 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1667-782X2014000100004 |
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| Petracci,Pablo F.; La Sala,Luciano F.; Aguerre,Gimena; Pérez,Cristian H.; Acosta,Nicolás; Sotelo,Martín; Pamparana,Carolina. |
| La Gaviota Cocinera (Larus dominicanus) está ampliamente distribuida en Argentina. Es una especie de comportamiento alimentario generalista y oportunista; según algunos autores, su capacidad de explotar recursos alimentarios derivados de actividades humanas ha favorecido su expansión geográfica. En este estudio se da a conocer la dieta de la Gaviota Cocinera durante el período reproductivo en una colonia de 3114 nidos ubicada en la Isla del Puerto, estuario de Bahía Blanca, provincia de Buenos Aires, Argentina. Se analizó un total de 1024 egagrópilas, cinco regurgitados de pichones y 12 de volantones, recolectados entre los meses de octubre y diciembre de 2003. Se registraron 39 categorías presa, de las cuales los granos (principalmente girasol) y la... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Argentina; Dieta; Estuario de Bahía Blanca; Gaviota Cocinera; Larus dominicanus; Período reproductivo. |
| Ano: 2004 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0073-34072004000100004 |
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| Chemes,Silvina B.; Giraudo,Alejandro R.; Gil,Guillermo. |
| Se analizó la dieta de Lontra longicaudis en el Parque Nacional El Rey, en la eco-región de las Yungas, noroeste argentino. Se compararon estos datos con los de poblaciones previamente estudiadas en la laguna Iberá (Esteros del Iberá) y en el río Iguazú (Selva paranaense) en el nordeste argentino. Se analizaron 130 heces colectadas en 37 sitios evaluando porcentaje de ocurrencia, frecuencia relativa, importancia relativa porcentual y diversidad de Levin. Se comparó con otras poblaciones mediante el índice de similitud porcentual, re-muestreo por bootstrap y análisis no paramétricos. De un total de 623 presas, peces, insectos y crustáceos fueron más frecuentes que anfibios, moluscos, reptiles y mamíferos. La mayoría de las presas fueron organismos... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Argentina; Dieta; Lontra longicaudis; Yungas. |
| Ano: 2010 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-93832010000100003 |
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| Silveira,Eliane F. da; Amato,Suzana B.. |
| One hundred eight rosy-billed pochards, Netta peposaca (Vieillot, 1816), collected in Brazil and Argentina were examined for endoparasites. Collection sites included the municipalities of Santa Vitória do Palmar and Jaguarão, Rio Grande do Sul State, Brazil (wintering site) and Alvear, Corrientes Province, northern Argentina (nesting site). Birds were frozen in dry ice after collection. During necropsy they were categorized according to sex and maturation, either adult or juvenile. The cestode Diploposthe laevis (Bloch) Jacobi, 1896 was found (prevalence 68.5%, mean infection was 2). The mean prevalence of D. laevis in Alvear (25.9%) was higher than found in Jaguarão and Santa Vitória do Palmar, Rio Grande do Sul (19%), and could be related to the nesting... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Argentina; Brazil; Migratory flyway; Nesting site; Rosy-billed pochard; Wintering site. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752008000100012 |
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| Vignatti,Alicia María; Cabrera,Gabriela Cecilia; Echaniz,Santiago Andrés. |
| Moina macrocopa is common in eutrophic water bodies. Two subspecies have been described: M. macrocopa macrocopa (Straus, 1820), whose original distribution was restricted to the Old World, and M. macrocopa americanaGoulden, 1968, recorded only in North America. In 1994, the species was found in Bolivia, and in 1997 it was found in the northeast of Argentina. As the specimens belonged to M. macrocopa macrocopa in both cases, the authors suggested that it may have been introduced from the Old World by anthropogenic means. The aim of this study was to assess the distribution of M. macrocopa in La Pampa (Argentina), and provide information on its population characteristics under natural conditions. The species was recorded in six out of more than 100 water... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Argentina; Temporary lakes; Cladocera; Moina macrocopa; Invasive species. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032013000300086 |
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| Kandus, Patricia; UBA/Argentina; Minotti, Priscila; UC/Argentina; Malvárez, Ana Inés; UBA/Argentina. |
| We generated a map of wetlands in Argentina from the digital edition of the National Soil Inventory made by the National Institute of Agricultural Technology (Instituto Nacional de Tecnología Agropecuaria, INTA). Potential wetland areas were extracted from the map after an exhaustive analysis of the database and reassignment of the soil classes, by taking into account 1) soil taxonomic classes; 2) constraining factors (waterlogging, flooding, drainage impairment); and 3) cartographic categories, including lakes, lagoons, marshes and salt lakes. Estimated wetland area is about 600,000 km2, representing 21.5% of the national territory; it increases to 23% when considering salt lakes and deepwater bodies, but their surface is underestimated in the INTA... |
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Palavras-chave: Wetlands; Soil chart; National inventory; Argentina wetlands; Soil chart; National inventory; Argentina. |
| Ano: 2008 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/5870 |
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| Cassá de Pazos,Liliana A.; Vidoz,Félix F.; Giudice,Gabriela E.; Ramos Giacosa,Juan P.; Luna,María L.; De La Sota,Elías R.. |
| Se estudiaron los helechos y licofitas presentes en el Parque Nacional Lago Puelo, Chubut, Argentina. Se determinó la presencia de 47 taxa, de los cuales 12 constituyen nuevos registros para la Provincia de Chubut y 1 para la Región Patagónica. Se observó una elevada diversidad taxonómica, representando más del 50 % de la flora patagónica. Varios de los taxa crecen exclusivamente en el área y en Chile a iguales latitudes. El paso Puelo, que conecta Argentina y Chile, es el más bajo de la Cordillera de los Andes en Norpatagonia y es vía de ingreso de especies valdivianas. La presencia de animales de pastoreo, invasión de plantas exóticas y el riesgo latente de incendios, significan un peligro para la supervivencia de la flora del Parque. Todas estas... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Helechos; Licofitas; Parque Nacional Lago Puelo; Argentina. |
| Ano: 2010 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-23722010000200016 |
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| Robles,Carolina A; D’Jonsiles,María F; Romano,Gonzalo M; Hladki,Adriana; Carmarán,Cecilia C. |
| La familia Diatrypaceae (Xylariales) incluye mayormente especies saprótrofas y algunas especies patógenas sobre madera de angiospermas. El objetivo de este trabajo es actualizar la taxonomía y la distribución de las 30 especies y complejos de especies de Diatrypaceae registradas para la Argentina. Se citan por primera vez a Diatrype concolor, D. megale, complejo D. polycocca, D. phaselina, complejo Eutypa consobrina, Eutypella aspera y E. lophiostomoides y se amplía la distribución de cinco especies: Diatrype chlorosarca, complejo D. enteroxantha - D. puiggarii, D. patagonica, D. wrightii y Peroneutypa scoparia. Se propone a Eutypella bonariensis como sinónimo de Peroneutypa scoparia. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Argentina; Diatrypaceae; Nuevos registros. |
| Ano: 2016 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0011-67932016000200008 |
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| Rosato,Vilma G.. |
| Lichens can affect buildings and monuments inducing a negative aesthetical impact as well as causing deterioration through mechanical and chemical processes. Given that cement mortars and concrete are the primary 20th century building materials worldwide, it is important to study lichens growing on this substrate. In a survey of different localities of Buenos Aires Province, 33 species growing on mortars and concrete were collected and identified utilizing morphological and chemical studies. Results showed that Staurothele frustulenta is a new record for Argentina, and Acarospora subcastanea is a new record for Buenos Aires Province. A high number of foliose lichens (15 species) were registered. Some species were previously only known on tree barks, but in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lichens; Mortar; Concrete; Buenos Aires; Argentina. |
| Ano: 2006 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0011-67932006000100008 |
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| Teta,Pablo; D'Elía,Guillermo; Flores,David; de La Sancha,Noé. |
| Phylogenetic analysis of a fragment of the mitochondrial genome and qualitative and quantitative assessments of morphological variation suggest that, in its current conception, Thylamys pusillus (Desmarest, 1804) is a complex of at least three species. In the taxonomic arrangement proposed in this work, the populations in the Argentinean provinces of Entre Ríos and Corrientes are here referred to T. citellus (Thomas, 1912), while the small Thylamys that lives in the Argentinean Dry Chaco are provisionally referred to T.pulchellus (Cabrera, 1934). In our scheme, Thylamys pusillus is restricted to the Bolivian and Paraguayan Chaco and the vicinities of northern Formosa province in A rgentina. We provide emended diagnosis for T. citellus and T. pulchellus,... |
| Tipo: Journal article |
Palavras-chave: Argentina; Mouse opossum; Species limits; Taxonomy. |
| Ano: 2009 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382009000200003 |
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| Galosi,C.M.; Norimine,J.; Echeverría,M.G.; Oliva,G.A.; Nosetto,E.O.; Etcheverrigaray,M.E.; Tohya,Y.; Mikami,T.. |
| The genomes of 10 equine herpesvirus 1 (EHV-1) strains isolated in Argentina from 1979 to 1991, and a Japanese HH1 reference strain were compared by restriction endonuclease analysis. Two restriction enzymes, BamHI and BglII, were used and analysis of the electropherotypes did not show significant differences among isolates obtained from horses with different clinical signs. This suggests that the EHV-1 isolates studied, which circulated in Argentina for more than 10 years, belong to a single genotype. |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Argentina; Electropherotypes; Equine herpesvirus. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1998000600007 |
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| Registros recuperados: 734 | |
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