2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/20/2019 | 10:00 AM - 10:15 AM | COMPOSITION OF ALGAL ASSEMBLAGES DIFFERS WITH THE TEMPORAL PATTERN OF PHOSPHORUS LOADING | 254 B
COMPOSITION OF ALGAL ASSEMBLAGES DIFFERS WITH THE TEMPORAL PATTERN OF PHOSPHORUS LOADING
Ecological theory suggests resource availability regulates community composition. In streams, nutrients are a limiting resource for algal assemblages. Nutrient loading to streams, however, varies temporally with the input of continuous or episodic loads from point and non-point sources, respectively. Nutrient loading pattern can thus alter the temporal availability of nutrients to stream algal assemblages. To assess how phosphorus loading pattern structures taxonomic composition and biomass of algal assemblages, we conducted a 29-day phosphorus enrichment experiment in nine stream mesocosms randomly assigned to three treatments: (1) a continuous, high phosphorus load (~5.9 g) delivered evenly (press); (2) an episodic, high phosphorus load (~5.9 g) with ~85% delivered in two 48-hour events (pulse) and; (3) a continuous, low phosphorus load (~1.2 g) representing background phosphorus concentrations (control). Phosphorus enrichment increased biomass accrual, but peak biomass did not differ between press and pulse treatments. Composition of algal classes were also similar between enriched assemblages yet differed in comparison to the control. However, diatom species composition differed among all treatments. Our results demonstrate equivalent potential for algal assemblages to accrue biomass from continuous and episodic phosphorus loads, but assemblage composition diverges with loading pattern.
- Nutrients
- Phosphorous
- Mesocosm
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Presenters/Authors
Nolan J.T. Pearce
(), Western University & Canadian Rivers Institute, npearce7@uwo.ca;
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Kathryn E. Thomas
(), Environment and Climate Change Canada, katie.thomas@canada.ca;
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Isabelle Lavoie
(), Institut National de la Recherche Scientifique, Centre Eau Terre Environnement, isabelle.lavoie@ete.inrs.ca;
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Patricia A. Chambers
(), Environment and Climate Change Canada, 867 Lakeshore Rd., Burlington Ontario, Canada, L7R 4A6, patricia.chambers@canada.ca;
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Adam G. Yates
(), Western University & Canadian Rivers Institute, adam.yates@uwo.ca;
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