English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

. 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.

Impact of Summer Cattle Grazing on the Sierra Nevada Watershed: Aquatic Algae and Bacteria