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Extramural Research

Grantee Research Project Results

Grantee Research Project Results

Effects of Nutrient Enrichment on Food Web Dynamics in Restored Freshwater Habitats

EPA Grant Number: U915143
Title: Effects of Nutrient Enrichment on Food Web Dynamics in Restored Freshwater Habitats
Investigators: Bolser, Robin C.
Institution: University of California - Santa Barbara
EPA Project Officer: Smith, Bernice
Project Period: January 1, 1997 through January 1, 2001
Project Amount: $102,000
RFA: STAR Graduate Fellowships (1997)
Research Category: Academic Fellowships , Ecological Indicators/Assessment/Restoration , Fellowship - Ecology and Ecosystems



The objectives of this research project are to: (1) investigate the factors influencing the nutritional quality of aquatic plants in temporary ("vernal") pools in southern California; and (2) investigate the effects of variation in plant quality on food web dynamics in this system.


Plants growing in environments that differ in nutrient inputs can vary greatly in food quality for herbivores. For example, nitrogen content of plant tissue can increase with fertilization or plant chemical defenses can be altered. Comparative studies of vernal pool communities varying in restoration status (natural, enhanced, or created) will be conducted. Later, experimental manipulations of nutrients in mesocosms (children's pools) will hopefully allow separate testing of the effects of plant amount (productivity) versus plant quality on growth and survival of consumer organisms with and without their predators.

Supplemental Keywords:

fellowship, nutrient enrichment, food web dynamics, restored freshwater habitats, nutrient inputs, nitrogen, southern California, CA, vernal pool communities, predators, consumer organisms., RFA, Scientific Discipline, Geographic Area, Water, Ecosystem Protection/Environmental Exposure & Risk, Nutrients, Aquatic Ecosystems & Estuarine Research, Restoration, State, Aquatic Ecosystem, Environmental Monitoring, Ecology and Ecosystems, Aquatic Ecosystem Restoration, marine food web, nutrient supply, nutrient dynamics, nutrient concentrations, nutrient enrichment, food web changes, nutrient flux, aquatic food web, ecological variation, restoration strategies, aquatic plants, vernal pool communities, aquatic ecosystems, nitrogen compounds, ecosystem restoration, California (CA), estuarine food web, nutrient regeneration, freshwater habitat, nitrogen, nutrient management

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The perspectives, information and conclusions conveyed in research project abstracts, progress reports, final reports, journal abstracts and journal publications convey the viewpoints of the principal investigator and may not represent the views and policies of ORD and EPA. Conclusions drawn by the principal investigators have not been reviewed by the Agency.

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