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  1. Article ; Online: Spatial Pattern and Habitat Requirements of Galaxias maculatus in the Last Un-Interrupted Large River of Patagonia

    Marina Tagliaferro / Analía Quiroga / Miguel Pascual

    Environment and Natural Resources Research, Vol 4, Iss

    A Baseline for Management

    2013  Volume 1

    Abstract: The relationship between the native Galaxias maculates and environmental variables was studied in 52 sites located along 306 km of the main stemof the Santa Cruz River, the second largest river in Argentinean Patagonia. The abundance varied along the ... ...

    Abstract The relationship between the native Galaxias maculates and environmental variables was studied in 52 sites located along 306 km of the main stemof the Santa Cruz River, the second largest river in Argentinean Patagonia. The abundance varied along the river, with three general sections clearly defined: upstream with minimum abundance increasing towards midstream and downstream areas. Distance to the sea and river wet width which were negatively significantly associated with abundance,and maximum depth explained the abundance in a polynomial shape – achieving a total explanation of 41.1%. The best predictive model also combined the river sinuosity.Our results suggested that the construction of two proposed hydroelectric dams will modify these variables, which might generate changes in G. maculates distribution. The information obtainedduring the present study represents valuable information for conservation management of this species.
    Keywords Geography. Anthropology. Recreation ; G ; Environmental sciences ; GE1-350
    Subject code 333
    Publishing date 2013-12-01T00:00:00Z
    Publisher Canadian Center of Science and Education
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article: Dams in the last large free-flowing rivers of Patagonia, the Santa Cruz River, environmental features, and macroinvertebrate community

    Tagliaferro, Marina / Ana Liberoff / Analia Quiroga / María Laura Miserendino / Miguel Pascual

    Limnologica. 2013 Nov., v. 43, no. 6

    2013  

    Abstract: Three large rivers have their headwaters in the Patagonian Ice Fields (PIFs) in the Andes Mountains, the largest mid-latitude ice masses on Earth: Santa Cruz, Baker and Pascua. They are the last large free flowing rivers in Patagonia, but plans are ... ...

    Abstract Three large rivers have their headwaters in the Patagonian Ice Fields (PIFs) in the Andes Mountains, the largest mid-latitude ice masses on Earth: Santa Cruz, Baker and Pascua. They are the last large free flowing rivers in Patagonia, but plans are advanced for building dams for hydroelectric power generation. The three PIF rivers, with a discharge dominated by ice melt, share a common, unique hydrograph compared to that of the other eight large rivers in the region: a distinct seasonal cycle, and an extremely stable discharge, with much lower variability than other rivers. In this study we present the first extensive survey of habitats and benthic macroinvertebrates in the least studied system, the Santa Cruz River. We assess how much of the natural capital provided and sustained by benthic invertebrates are expected to be lost by flooding and discuss how dams would affect riverine habitat and biota. In the Santa Cruz River, we conducted an intensive field survey during September 2010; a total of 52 sites located at regular 6km intervals were sampled along the 310 river-km for macroinvertebrates and seventeen habitat variables. Although some habitat structure is apparent at the local scale, the Santa Cruz River could be described as very homogeneous. Macroinvertebrate density and the richness (38 genera) found in the Santa Cruz River resulted to be one of the lowest in comparison with 42 other Patagonian rivers. Albeit weak, the structure of the macroinvertebrates assemblages was successfully described by a reduced set of variables. The reduced flow variation and the lack of bed scouring flows have a direct and negative effect on the heterogeneity of riverbeds and banks. The high turbidity of the Santa Cruz River may also contribute to shorter food webs, by affecting autotrophic production, general trophic structure, and overall macroinvertebrate productivity and diversity. Dams will obliterate 51% of the lotic environment, including the most productive sections of the river according to our macroinvertebrate data. Since Santa Cruz River has a naturally homogeneous flow cycle, dams may provide more variable flows and more diverse habitat. Our data provide critically valuable baseline information to understand the effects of dams on the unique set of glacial driven large rivers of Patagonia.
    Keywords food webs ; hydroelectric power ; hydrograph ; ice ; latitude ; lotic systems ; macroinvertebrates ; melting ; natural capital ; power generation ; riverine habitat ; rivers ; seasonal variation ; stream channels ; surveys ; turbidity ; Andes region ; Argentina
    Language English
    Dates of publication 2013-11
    Size p. 500-509.
    Publishing place Elsevier GmbH
    Document type Article
    ZDB-ID 3380-7
    ISSN 0075-9511
    ISSN 0075-9511
    DOI 10.1016/j.limno.2013.04.002
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

    Z 76/720: Show issues
    Z 7464: Show issues

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  3. Article ; Online: EFECTO DE CURCUMINA EN CÈLULAS DE MAMA HUMANA ZR-75-1

    Analía Quiroga / Elio Soria / Patricia Quiroga / Estefanía Martínez / Mirta A. Valentich

    Boletín Latinoamericano y del Caribe de Plantas Medicinales y Aromáticas, Vol 6, Iss 6, Pp 358-

    2007  Volume 359

    Abstract: La curcumina, diferuloilmetano, 1,7-bis-(4-hidroxi-3-metoxi fenil)-hepta-1,6-dieno-3,5-diona, es un compuesto polifenólico, que se extrae de los rizomas de la Curcuma Ionga a los que le da el color amarillo característico y ha sido utilizado como aditivo ...

    Abstract La curcumina, diferuloilmetano, 1,7-bis-(4-hidroxi-3-metoxi fenil)-hepta-1,6-dieno-3,5-diona, es un compuesto polifenólico, que se extrae de los rizomas de la Curcuma Ionga a los que le da el color amarillo característico y ha sido utilizado como aditivo alimenticio. Posee actividad antiinflamatoria, antioxidativa, pro-apoptótica, antitumoral y anticancerosa. La gama glutamiltranspeptidasa (GGTP) es una enzima de membrana que metaboliza el glutation, molécula con elevada capacidad antioxidativa. Es marcadora de estrés celular y de algunos cánceres. Valoramos el efecto de la curcumina, en células ZR-75-1 con o sin la adición de Sulfato de Cobre, un agente oxidativo, sobre la proliferación, la actividad de la enzima GGTP, y la visualización de la apoptosis. La proliferación celular disminuye significativamente con el tratamiento con curcumina (20 y 40 mM) pero no es afectada significativamente con la adición de Sulfato de Cobre (2.5 y 10 mM). La curcumina (5 y 10 mM) disminuye la actividad específica de la enzima GGTP presentando un comportamiento bifásico con un punto de inflexión a los 20 mM de curcumina e incrementando a la concentración de 40 mM. La adición de 2.5 mM de Sulfato de Cobre no modificó el efecto de la curcumina sin embargo 10 mM de Sulfato de Cobre provocó un efecto aditivo en la disminución de la actividad de la enzima GGTP. Se observaron figuras apoptóticas ante el tratamiento con curcumina con y sin el agregado de Sulfato de Cobre. La curcumina indujo apoptosis y afectó la proliferación de células ZR-75-1 y en forma bi-fásica la enzima GGTP lo cual fue potenciado con Sulfato de Cobre (10 mM).
    Keywords Plant culture ; SB1-1110 ; Agriculture ; S
    Language Spanish
    Publishing date 2007-01-01T00:00:00Z
    Publisher Agriscience University of Santiago de Chile
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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