JEB logo

Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

About Journal
    Home
    Editor in Chief
    Editorial Board
    Reviewer Panel
    Publication Policies
    Guidelines for Editors
    Guidelines for Reviewers
    Abstracting and Indexing
    Subscription and Payments
    Contact Journal
 
Read Journal
    Current Issue
    Journal Archives
 
For Authors
    Guidelines for Authors
    Terms and Conditions
    Fees and Payments
    Track Paper Status
 
Announcements
    JEB Awards
 

Google Search the Journal web-site:


    Abstract - Issue May 2008, 29 (3)                                     Back


Ostracods as indicators of pollution in the lakes of Mysore

Benthic invertebrates structure in wetlands of a tributary of the middle Parana River

(Argentina) affected by hydrologic and anthropogenic disturbances

Mercedes R. Marchese*1,2, Alba R. Rodriguez3, Paola J. Pave1 and Maria R. Carignano1

1Facultad de Humanidades y Ciencias (UNL), Ciudad Universitaria (3000) Santa Fe, Argentina

2Institute Nacional de Limnolog?a (INALI-CONICET-UNL), Jose Macia 1933 (3016) Santo Tome (Santa Fe), Argentina

3Instituto de Desarrollo Tecnologico para la Industria Qu?mica (INTEC-CONICET-UNL), Guemes 3450 (3000) Santa Fe, Argentina

(Received: October 24, 2006; Revised received: May 25, 2007; Accepted: June 05, 2007)

Abstract: The present study was aimed at analyzing chromium concentrations in water column and bottom sediments in the main channel of Northern Salado River (tributary of Middle Parana River) and its floodplain. The main changes caused by human activities and hydrological disturbances on benthic invertebrate structure were also analyzed. Sediment concentrations of the reference area varied between 44.2 and 97.1 μg Cr g-1 (dw), and in the impacted zone, between 85.5 and 209 μg Cr g-1 (dw) reaching the highest values in the wetland floodplain. Alfa, beta and gamma diversities in the reference section have been 33, 9 and 66 species, and in the disturbed section, they have been 37, 8.33 and 74 species, respectively. The species dominant in the disturbed habitats were characterized by a small body size and short life cycles, as the species of oligochaetes Naidinae. The extreme flooding produced a rejuvenation of the area with the consequent physical re-structuration produced by flooding, showing a marked decrease in chromium levels in sediments and in organic matter content, which allowed the colonization of insects (Ephemeroptera and Trichoptera).

Key words: Invertebrate assemblages, Chromium, Wetland floodplain, Parana River tributary

PDF of full length paper is available with author (mmarchese@datamarkets.com.ar)

 

Copyright ? 2008 Triveni Enterprises. All rights reserved. No part of the Journal can be reproduced in any form without prior permission. Responsibility regarding the authenticity of the data, and the acceptability of the conclusions enforced or derived, rest completely with the author(s).