EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/22/2018 | 3:15 PM - 3:30 PM | DO ALGAE CARE ABOUT LIGHT AND NUTRIENTS? | 320
DO ALGAE CARE ABOUT LIGHT AND NUTRIENTS?
Past research has shown a dynamic relationship for the influences of light and dissolved nutrients on stream algae. We posed the question: Can we predict instream responses in small streams when forests in riparian zones and catchments are modified? Many ecologists would predict that increased light into streams would result in increased algae and primary production. Biogeochemists might suggest the primacy of nutrient stoichiometry and limitation. Alternatively, biologists would ask about the influence of herbivores. Here we share findings from a large experimental study of epilithon activity and standing stocks, nutrients, and shade within food web context of the Trask River Watershed Study. We did not find consistent differences in chlorophyll a or epilithon standing stock among six clearcut watersheds and five forested reference watershed streams during pre- and post-harvest (5yr and 4yr) periods. Nutrient concentrations and molar ratios varied greatly among watersheds, and harvested watersheds showed increasing nitrate each year post-harvest. Small riparian buffers did not dampen the increase. Ammonium, DON, DOC and phosphorus did not increase post-harvest. We explore several models of alternative relationships among algae, light and nutrients that might help explain these results.
- Ecosystem
- Aquatic-terrestrial Linkage
- Algae
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Presenters/Authors
Sherri Johnson
(), U.S. Forest Service, Pacific Northwest Research Station, sherrijohnson@fs.fed.us;
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Alba Argerich
(), School of Natural Resources, University of Missouri, argericha@missouri.edu;
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Linda Ashkenas
(), Oregon State University, linda.ashkenas@oregonstate.edu;
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