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Article: Biological assessment of Tecate Creek (U.S.-Mexico) with special regard to self-purification.
- Article from:
- Bulletin (Southern California Academy of Sciences)
- Article date:
- April 1, 2005
- Author:
CopyrightCOPYRIGHT 2005 Southern California Academy of Sciences. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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Abstract.--Macroinvertebrate organisms were sampled at four sites on Tecate Creek (U.S.-Mexico) and quantitatively evaluated using the SIGNAL-w (Stream Invertebrate Grade Number--Average Level-weighted) index. A morphological assessment of the stream structure was also carried out. Bioindication by SIGNAL reflected a very low water quality in the upper three sampled stream reaches, but with a significant improvement by the last site on the Rio Alamar, but only to a grade of critical to high pollution over a flowing distance of 29 kin. Levels of BOD and ammonium-N at the Rio Alamar (Toll Bridge) site remained quite high, 56 mg/L and 48 mg/L, respectively. Metal levels also ...
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