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Zooplankton influences on phytoplankton, water clarity, and nutrients in Lake Tahoe

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Abstract

The grazing effects of zooplankton communities are predicted to be strongest in mesotrophic lakes relative to eutrophic and oligotrophic lakes, an idea known as the Mesotrophic Maximum Hypothesis. We tested if the predictions of this hypothesis depend on the community of zooplankton present by evaluating whether the community of zooplankton, in addition to lake trophic state, interact to determine the magnitude of grazing effects. We conducted mesocosm experiments to evaluate the effects of Daphnia spp., Epischura nevadensis, and juvenile and adult Mysis diluviana on ecosystem function in oligotrophic Lake Tahoe and its more productive embayment, Emerald Bay. In the Lake Tahoe experiment, the Daphnia and the Adult Mysid treatments produced lower dissolved organic carbon concentrations, and the Epischura treatment yielded lower soluble reactive phosphorus concentrations compared to a Control treatment that lacked macrozooplankton. In the Emerald Bay experiment, the Daphnia treatment lowered chlorophyll a concentrations, the Daphnia and Juvenile Mysid treatments reduced small particle (diameter 0.5 – < 5 µm) concentrations, and each of the species treatments produced higher ammonium concentrations and DIN/SRP ratios compared to the Control. Analyses of similarities (ANOSIM) indicated that these taxa differed from one another in their overall effects on Emerald Bay water, but not on Lake Tahoe water. This finding supports the Mesotrophic Maximum Hypothesis, but also shows that grazing effects are dependent on the taxonomic makeup of the zooplankton community in addition to lake trophic state. As ongoing cultural eutrophication continues to elevate Lake Tahoe's productivity, the roles and importance of the lake’s zooplankton taxa may diverge.

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The codes written for analyzing data in this study were created using R Studio version 3.6.3 and are available from the corresponding author on request.

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Acknowledgements

Drs. Steve Sadro (UC Davis) and Michael Brett (University of Washington) provided feedback in the design of the experiments. Dr. Kevin Shoemaker (University of Nevada, Reno) provided recommendations for the statistical analyses. Dan Shaw and Nita Suparek coordinated access and field collections from Emerald Bay. Cam McKay from the Glenbrook Water Facility assisted in water collections for the Lake Tahoe experiment. The following people assisted in the two semi-natural experiments: Dr. Tim Caldwell, Karly Feher, Emily Carlson, Dr. Emmanuele Ziaco, Elizabeth Everest, Dr. Facundo Scordo, Dr. Ed Krynak, James Simmons, Josh Culpepper, Loren Secor, Anna Cole, Shaye McMillen, and Logan Gregory. Aldo San Pedro assisted with software processing of the figures. Bonnie Teglas managed the funding for this project.

Funding

This work was funded by a grant from the California Tahoe Conservancy to G. Schladow (UC Davis Tahoe Environmental Research Center) and a subaward to S. Chandra. Additionally, Z. Bess received the Student Scholarship from the California Lake Management Society and the Paul A. Bosace Graduate Scholarship from the University of Nevada, Reno.

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ZB—designed experiment; conducted experiment; analyzed data; wrote manuscript. SC—assisted in experimental design; conducted experiment; edited manuscript and data analysis; secured funding for the project. ES—conducted experiment; edited manuscript. SK—conducted experiment; edited manuscript. AH—edited manuscript and assisted in data analysis.

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Correspondence to Zachary Bess.

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The authors declare that they have no conflicts of interest.

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The datasets generated during and/or analyzed during the current study are available from the corresponding author on request.

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Bess, Z., Chandra, S., Suenaga, E. et al. Zooplankton influences on phytoplankton, water clarity, and nutrients in Lake Tahoe. Aquat Sci 83, 26 (2021). https://doi.org/10.1007/s00027-020-00772-6

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  • DOI: https://doi.org/10.1007/s00027-020-00772-6

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