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Dynamics of the deep chlorophyll layer

Annie Scofield, Jim Watkins, Lars Rudstam (Cornell), Brian Weidel (USGS), (funded by EPA-GLNPO)

Deep chlorophyll layers (DCLs) are important features during thermal stratification in large oligotrophic lakes. The presence of a DCL has been observed in all five of the North American Great Lakes, but its ecological significance is not well understood. We collaborated with GLNPO researchers to understand the importance of DCLs for lake production, zooplankton, and fish distributions. In 2019, we submitted three manuscripts associated with the distribution of zooplankton and the time trends in DCL across the 5 Great Lakes. Two of these are in press, and the third has been revised and resubmitted. This project is now completed.