Recursos de colección

Universidad Nacional de La Plata (75.269 recursos)

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Número 31

Mostrando recursos 1 - 7 de 7

  1. Aplicación de índices bióticos basados en diatomeas epífitas sobre schoenoplectus californicus (C.A. Mey.) Soják, en lagunas pampeanas de argentina

    Mac Donagh, María Elicia; Paredes del Puerto, Juan Martín; Altieri, Paula
    The objective of this work is to compare epiphytic diatom-based biotic indexes in lakes with distinct land-uses in their watersheds. Bulrush epiphytes and water physico-chemical characteristics were seasonally sampled in two geomorphological similar pampean shallow lakes. Seven diatom-based biotic indexes were calculated together with similarity, diversity and eutrophication indexes. According to TSI indexes Lacombe lake was eutrophic most of the time whereas La Rosita had a more variable trophy (meso-eutrophic) throughout the seasons. The latter also reached the lowest (chlorophyll a) and the highest (TP) TSI values. La Rosita always showed lower diversity and richness values than Lacombe, with a...

  2. Productividad, estado trófico y dinámica fitoplanctónica en la laguna Sauce Grande y su afluente homónimo (pcia. de Buenos Aires, Argentina)

    Cony, Noelia; Ferrer, Nora; Martínez, Ana; Cáceres, Eduardo
    The shallow lake Sauce Grande is located in the southwest of Buenos Aires province. It is a widening of the Sauce Grande River that flows in and out of the lake. The aim of this study is to estimate for the first time the primary productivity (PP) of this lake and to contrast the physiochemical variables, phytoplankton structure and trophic status with those of its main tributary. Monthly samplings (April-September 2014) were performed in the middle basin of the river and on the coast of the lake. We recorded in situ physical and chemical parameters with a multisensor Horiba U-10. Phytoplankton...

  3. Implementación de una nueva técnica para determinar el estado trófico del Embalse Río Tercero (Córdoba, Argentina)

    Bonansea, Matías; Garetto, Edgar; Rodríguez, Claudia; Pinotti, Lucio
    In central Argentina the alternation of cycles of rainfall above or below the historic mean is frequent; so, many saline lakes can dry or fill in a short time. As in La Pampa most of the studies on these lakes were limited to annual cycles, the information about variations under different climatic conditions is scarce. The aims of this study were to determine the limnological and zooplankton parameters of a semi-permanent Pampean saline lake during 2013 posterior to its filling after a drought, to compare the information with that obtained in 2007, because the two annual cycles had relatively different...

  4. Comparación de los parámetros limnológicos y el zooplancton de un lago somero salino de La Pampa (Argentina) durante dos ciclos anuales con condiciones ambientales diferentes

    Echaniz, Santiago; Vignatti, Alicia; Cabrera, Gabriela; Capecce, Candela; Treffinger Cienfuegos, María Soledad
    In central Argentina the alternation of cycles of rainfall above or below the historic mean is frequent; so, many saline lakes can dry or fill in a short time. As in La Pampa most of the studies on these lakes were limited to annual cycles, the information about variations under different climatic conditions is scarce. The aims of this study were to determine the limnological and zooplankton parameters of a semi-permanent Pampean saline lake during 2013 posterior to its filling after a drought, to compare the information with that obtained in 2007, because the two annual cycles had relatively different...

  5. Impacto del uso del suelo sobre la condición de ribera en arroyos pampeanos y su relación con la estructura de la comunidad de peces

    Granitto, María; Rosso, Juan José; Boveri, María B.; Rennella, Armando M.
    In the last 30 years agricultural areas have occupied a larger proportion of cultivable zone in the Pampa Plain, generating the movement of livestock activities to the margins of waterways. These changes in land use can cause hydrological, morphological, physicochemical and biological alterations in the lotic systems of this region. The aim of this study is to evaluate the impact of different types of land use on the structure of the fish community in streams of the middle basin of Areco River. To do this, monthly samplings were realized during the summer of 2014 in four tributaries of the Areco...

  6. Un caso inusual de eutrofización en el Embalse Río Tercero: el posible rol de dos bioinvasores

    Mariñelarena, Alejandro Jorge; Mac Donagh, María Elicia; Donadelli, Jorge Andrés; Casco, María Adela
    The trophic state is usually defined by the concentrations of total phosphorous and chlorophyll a. Besides the input of nutrients from catchment, the internal process can modify the trophic state in reservoirs and lakes. Embalse Río Tercero is a multipurpose reservoir that has been object of a limnological study since 1996, as a requirement of the Nuclear Power Plant that uses the water for cooling. Invasive species have been reported in this reservoir: the mussel Limnoperna fortunei Dunker 1857, since 1996 and the dinoflagellate Ceratium hirundinella (O.F.Müller) Dujardin 1841, since 1999. As a result of their successful colonization, some characteristics...

  7. Lagunas periurbanas de Corrientes (Argentina): de la mesotrofía a la eutrofia un camino de ida y vuelta en 20 años

    Poi, Alicia Susana Guadalupe; Casco, Sylvina Lorena; Neiff, Juan José; Carnevali, Romina Patricia; Gallardo, Luciana Irene
    More than 50,000 sub-rounded shallow lakes fed by rain are found on sandy hills fed by rain in Corrientes Province. We selected two lakes near Saladas city as representative of the wetlands prevailing in the region. The aim of this study is to describe the changes in the ecological state of Soto and Sánches lakes, from the use of the basin and recurrence of wet and dry periods. Thirty non periodic samplings were carried out in each lake between 1992 and 2014, during years with different rainfall regime. According to the annual precipitation we distinguish three periods: 1992-1999 (with high...

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