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JOURNAL OF PLANKTON RESEARCH | VOLUME 6 | NUMBER 5 | PAGES 751-766 | 1984
© Oxford University Press

research-article

Phytoplankton dynamics within the subsurface chlorophyll maximum of Lake Michigan1

Russell A. Moll, Mark Z. Brache and Thomas P. Peterson

Great Lakes Research Division, University of Michigan Ann Arbor, MI 48109, USA

Received on June 1, 1983; accepted on June 1, 1984

The Lake Michigan deep chlorophyll maximum during July 1977 was a broad band of phytoplankton –15 m thick rather than the thin layers observed in smaller lakes. The maximum concentration of chlorophyll was typically four times surface values. 14C uptake incubations showed that the deep plankton layer was a viable component of the pelagic ecosystem accounting for up to 60% of primary production on an areal (m2) basis. The Lake Michigan chlorophyll maximum was composed primarily of large diatoms, filaxnentous green algae, and flagellates. Although large scale physical processes such as seiches had some effect on the chlorophyll maximum, the basic integrity of the layer was maintained by biological processes. In particular, epilinmetic nutrient depletion was apparently a major factor affecting the vertical distribution of phytoplankton. Application of a diffusion model to the chemical and chlorophyll data indicated that nutrient uptake and primary production by phytoplankton were more important in determining chemical and chlorophyll vertical profiles than diffusivity.

1Contribution No. 389 from the Great Lakes Research Division, University of Michigan.


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