Contribution of zooplankton nutrient recycling and effects on phytoplankton size structure in a hypereutrophic reservoir

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Authors

Tyler James Butts , Eric K Moody, Grace Marie Wilkinson

Abstract

Consumer nutrient recycling influences aquatic ecosystem functioning by altering the movement and transformation of nutrients. In hypereutrophic reservoirs, zooplankton nutrient recycling has been considered negligible due to high concentrations of available nutrients. A comparative analysis (Moody and Wilkinson, 2019) found that zooplankton communities in hypereutrophic lakes are dominated by nitrogen (N)-rich species, which the authors hypothesized would increase phosphorus (P) availability through excretion. However, zooplankton nutrient recycling likely varies over the course of a growing season due to changes in biomass, community composition, and grazing pressure on phytoplankton. We quantified zooplankton, phytoplankton, and nutrient concentration dynamics during the summer of 2019 in a temperate, hypereutrophic reservoir. We found that the estimated contribution of zooplankton excretion to the dissolved nutrient pool on a given day was equivalent to a substantial proportion (21-39%) of the dissolved inorganic P standing stock in early summer when P concentrations were low and limiting phytoplankton growth. Further, we found evidence that zooplankton affected phytoplankton size distributions through selective grazing of smaller phytoplankton cells likely affecting nutrient uptake and storage by phytoplankton. Overall, our results demonstrate zooplankton excretion in hypereutrophic reservoirs likely helped drive springtime phytoplankton dynamics through nutrient recycling while grazing influenced phytoplankton size distributions.

DOI

https://doi.org/10.31223/X5HP80

Subjects

Biochemistry, Biology, Ecology and Evolutionary Biology, Life Sciences, Other Life Sciences

Keywords

nutrient cycling, stoichiometry, hypereutrophic, body size, excretion

Dates

Published: 2022-02-17 18:59

Last Updated: 2022-08-04 21:08

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License

CC BY Attribution 4.0 International

Additional Metadata

Conflict of interest statement:
None

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