Recursos de colección

Universidad Nacional de La Plata (74.783 recursos)

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Número 24

Mostrando recursos 1 - 3 de 3

  1. Notas sobre cráneo, otolitos y biología de Lepidosiren paradoxa (Pisces, Dipnoi)

    González Naya, María Jimena; Volpedo, Alejandra; Gómez, Sergio Enrique
    Lungfishes are a singular group of Sarcopterygii which in the Neotropics is represented by Lepidosiren paradoxa. They present anatomical and physiological features that allow them to survive under adverse conditions. Here we described and illustrated the otoliths and determinate their composition. L. paradoxa skull is also described and illustrated with emphasis in the jaw morphology. This skull was compared with the skull of the other extant lungfishes Neoceratodus (Australian lungfish) and Protopterus (African lungfish). Experimental observations were included on the behavior in aquarium and on the construction of galleries under laboratory conditions. L. paradoxa otoliths presented subcircular shape with a convex...
    - 02-jun-2016

  2. Notas sobre el cambio ambiental en ictiología

    Gómez, Sergio Enrique
    In historical and geologic times significant climatic and topographical changes have taken place, the topographical changes are those where it varies the coordinate «z» that corresponds to the altitude or depth of the environment. The climatic changes can produce topographical changes, and in the other hand, topographical changes more rarely produce climatic changes. The human action generates many of these changes and it accelerates them notably. The dynamic interaction in the time of the three factors, climatic, topographical, and human it is what is denominated «environmental change». Inside this mark the dispersion of Hypostomus commersoni is analyzed in the east...
    - 02-jun-2016

  3. Eutrofización en las lagunas pampeanas

    Mariñelarena, Alejandro Jorge; Gómez, Sergio Enrique
    Many shallow lakes (lagunas) in Buenos Aires Province receive (municipal or industrial) wastewaters and (urban or agricultural) runoffs. Organic matter and nutrients additions increase the metabolism and biomass of the community (eutrophication). This process leads to changes in community structure (species replacement) and loss of aesthetic value. As secondary effects, the photosynthetic and respiratory activities of the planktonic community produce wide daily shifts in O2 and CO2 concentrations and pH values. Temperature and pH determine the ionic status and toxicity of certain compounds like ammonium nitrogen and hydrogen sulfide. Under special environmental conditions these factors may cause massive fish kills, quite...
    - 02-jun-2016

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