Relationships among catchment land use and concentrations of nutrients, algae, and dissolved oxygen in a southern California river
| Autor: | Allen D. Leydecker, Scott D. Cooper, Jason Kreitler, Kristie Klose |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Mediterranean climate
geography Chlorophyll a Biomass (ecology) geography.geographical_feature_category Ecology biology fungi Drainage basin food and beverages Estuary macromolecular substances Aquatic Science biology.organism_classification chemistry.chemical_compound Nutrient chemistry Algae Benthic zone Environmental science geographic locations Ecology Evolution Behavior and Systematics |
| Zdroj: | Freshwater Science. 31:908-927 |
| ISSN: | 2161-9565 2161-9549 |
| DOI: | 10.1899/11-155.1 |
| Popis: | Rapid human population growth engenders landuse changes and alters nutrients, algal biomass (as chlorophyll a [chl a]), and dissolved O2 concentrations (DO) in streams, but quantitative information on these relationships is limited in regions with a Mediterranean climate. We surveyed macroalgal % cover and chl a and physicochemical factors in spring and summer at 15 stream and estuarine sites in a catchment in southern California with a mosaic of undeveloped, agricultural, and urban areas to examine relationships among land use, nutrients, algae, and DO. We used nutrient diffusing substrata (NDS) at 12 sites to assess the nutrient(s) limiting algal growth. Algal chl a and pH often exceeded suggested or mandated water-quality impairment thresholds at sites affected by human activity, particularly those downstream from a wastewater treatment plant. Total N (TN) affected total and benthic algal chl a in spring and summer, total P (TP) affected benthic algal chl a in summer, and light influenced algae... |
| Databáze: | OpenAIRE |
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