Effects of Ultraviolet Radiation on Diel Vertical Migration of Crustacean Zooplankton: An in situ Mesocosm Experiment |
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| Authors: | Janet M. Fischer Jaclyn L. Nicolai Craig E. Williamson Anurani D. Persaud Ryan S. Lockwood |
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| Affiliation: | (1) Department of Biology, Franklin and Marshall College, Lancaster, Pennsylvania 17604-3003, USA;(2) Department of Earth and Environmental Sciences, Lehigh University, 31 Williams Hall, Bethlehem, Pennsylvania 18015-3188, USA;(3) Department of Zoology, Miami University of Ohio, Oxford, Ohio 45056, USA;(4) Environmental and Resource Studies Department, Trent University, K9J 7B8 Peterborough, Ontario, Canada |
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| Abstract: | The objective of this study was to expand the spatial scale of previous experiments on the effects of ultraviolet radiation (UVR) on diel vertical migration (DVM) by freshwater zooplankton. We conducted an in situ mesocosm experiment in highly UVR transparent Lake Giles, Pennsylvania, in which we imposed two treatments: ambient UVR and UVR-shielded. Mesocosms (3440 L, 0.74 m diameter, 8 m deep) were large enough to include a spatial refuge from UVR and permit relatively large-scale DVM. Daphnia catawba adopted a significantly deeper distribution during the day in the ambient UVR treatment compared to the UVR-shielded treatment, but effects of UVR were absent at night. In contrast, DVM by Leptodiaptomus minutus was unaffected by the UVR treatment. In both treatments, Leptodiaptomus minutus were most abundant at the bottom of the mesocosms during the day and exhibited a more uniform distribution across depths at night. These results suggest that UVR, along with temperature, algal resources, and predators, may affect zooplankton DVM in aquatic ecosystems. |
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| Keywords: | UV radiation vertical migration Daphnia catawba Leptodiaptomus minutus |
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