JOURNAL OF PLANKTON RESEARCH | VOLUME 16 | NUMBER 3 | PAGES 205-218 | 1994
© Oxford University Press
research-article |
The impact of short-term exposure to UV-B radiation on zooplankton communities in north temperate lakes
Department of Earth and Environmental Sciences, Lehigh University Bethlehem, PA 18015-3188, USA
Received on April 10, 1993; accepted on October 18, 1993
We exposed natural zooplankton communities to in situ levels of sunlight for 3 days at different depths in two north temperate lakes: one oligotrophic and one eutrophic. Natural fluxes of UV-B radiation (280–320 nm) were manipulated with cutoff filters (Mylar®). There was substantial mortality in some of the zooplankton exposed to UV-B in the oligotrophic lake, but not in the eutrophic lake. Reproduction of Diaptomus was suppressed by UV-B down to 6 m in the oligotrophic lake. These data suggest that natural levels of UV-B radiation in the oligotrophic lake may prevent some species of zooplankton from continuously exploiting the warm surface waters during summer stratification. In the more eutrophic lake, UV-B is a less important constraint in the vertical distribution of zooplankton. These differences in the responses of zooplankton to natural UV-B radiation in lakes may alter their ecological interactions with food resources, predators and other environmental variables in the water column.
1Present address: Universidad Nacional del Comahue, Centro Regional Universitario Bariloche, CC 1336, (8400) Bariloche, Argentina
2Present address: National Academy of Engineering, 2101 Constitution Avenue, NW, Washington, DC 20418, USA
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