Impact of Summer Cattle Grazing on the Sierra Nevada Watershed : Aquatic Algae and Bacteria
Joint Authors
Hayden, Curtis
Ger, K. Ali
Goldman, Charles R.
Richards, John R.
Derlet, Robert W.
Tanaka, Lidia L.
Source
Journal of Environmental and Public Health
Issue
Vol. 2012, Issue 2012 (31 Dec. 2012), pp.1-7, 7 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2012-02-21
Country of Publication
Egypt
No. of Pages
7
Main Subjects
Abstract EN
Introduction.
We evaluated periphytic algal and microbial communities to assess the influence of human and cattle impact on Sierra water quality.
Methods.
64 sites (lakes and streams from Lake Tahoe to Sequoia National Park, California) were sampled for suspended indicator bacteria and algae following standardized procedures.
The potential for nonpoint pollution was divided into three categories: cattle-grazing areas (C), recreation use areas (R), or remote wildlife areas (W).
Results.
Periphyton was found at 100% of C sites, 89% of R sites, but only 25% of W sites.
Eleven species of periphytic algae were identified, including Zygnema, Ulothrix, Chlorella, Spirogyra, mixed Diatoms, and Cladophoria.
Mean benthic algae coverage was 66% at C sites compared to 2% at W sites (P<0.05).
The prevalence of E.
coli associated with periphyton was 100% at C sites, 25% of R sites, and 0% of W sites.
Mean E.
coli CFU/gm of algae detected was: C = 173,000, R = 700, W = 0.
(P<0.05).
Analysis of neighboring water for E.
coli bacteria >100 CFU/100 mL: C = 91%, R = 8%, W = 0 (P<0.05).
Conclusion.
Higher periphytic algal biomass and uniform presence of periphyton-attached E.
coli corresponded to watersheds exposed to summer cattle grazing.
These differences suggest cattle grazing compromises water quality.
American Psychological Association (APA)
Derlet, Robert W.& Richards, John R.& Tanaka, Lidia L.& Hayden, Curtis& Ger, K. Ali& Goldman, Charles R.. 2012. Impact of Summer Cattle Grazing on the Sierra Nevada Watershed : Aquatic Algae and Bacteria. Journal of Environmental and Public Health،Vol. 2012, no. 2012, pp.1-7.
https://search.emarefa.net/detail/BIM-496570
Modern Language Association (MLA)
Derlet, Robert W.…[et al.]. Impact of Summer Cattle Grazing on the Sierra Nevada Watershed : Aquatic Algae and Bacteria. Journal of Environmental and Public Health No. 2012 (2012), pp.1-7.
https://search.emarefa.net/detail/BIM-496570
American Medical Association (AMA)
Derlet, Robert W.& Richards, John R.& Tanaka, Lidia L.& Hayden, Curtis& Ger, K. Ali& Goldman, Charles R.. Impact of Summer Cattle Grazing on the Sierra Nevada Watershed : Aquatic Algae and Bacteria. Journal of Environmental and Public Health. 2012. Vol. 2012, no. 2012, pp.1-7.
https://search.emarefa.net/detail/BIM-496570
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-496570