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JOURNAL OF PLANKTON RESEARCH | VOLUME 18 | NUMBER 2 | PAGES 225-237 | 1996
© Oxford University Press

research-article

The dynamics of vertical chlorophyll distribution in an oligomesotropbic lake

Richard P. Barbiero1 and Catherine M. McNair

Western Washington University, Institute of Watershed Studies Bellingham, WA 98225, USA 1Present address: Department of Botany, University College Galway Galway, Ireland

Received on July 26, 1995; accepted on October 14, 1995 The vertical distribution of chlorophyll was examined in relation to physical and chemical parameters in oligomesotrophic Lake Samish, Washington state, during the latter half of a growing season. A majority of chlorophyll resided in the metalimnion in late July, with metalimnetic populations dominated by diatoms (Cyclotella bodanica) and chrysophytes (Mallomonas caudata, Dinobryon sertularia). A silica gradient appeared to be most important in determining the vertical position of these populations. Later in the season, segregation of nutrients and light, in the face of a deepening epilimnion, led to transient accumulations of phytoplankton at the top of the metalimnion. It appeared that losses due to heterotrophic activities accentuated the lower boundary of this chlorophyll peak.


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