Freshwater dinoflagellates in palaeolimnological studies: Peridinium cysts as proxies of cultural eutrophication in the SE Great Lakes region of Ontario, Canada
Published:January 01, 2013
F. M. G. Mccarthy, A. M. Krueger, 2013. "Freshwater dinoflagellates in palaeolimnological studies: Peridinium cysts as proxies of cultural eutrophication in the SE Great Lakes region of Ontario, Canada", Biological and Geological Perspectives of Dinoflagellates, J. M. Lewis, F. Marret, L. R. Bradley
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Recent studies illustrate the potential of dinoﬂagellates as palaeolimnological proxies using a combined phycological and palynological approach, relating the stratigraphic and biogeographic distribution of cysts attributed to several species of Peridinium to environmental conditions in lakes with documented anthropogenic impact. Cultural eutrophication associated with both indigenous and Euro-Canadian settlement at various sites in the Great Lakes region of Ontario is expressed by a sharp increase in dinocyst abundance and a decline in Peridinium wisconsinense Eddy relative to species better adapted to eutrophic conditions. Total concentrations exceeded 46 000 cysts/mL in varved sediments deposited when Crawford Lake was impacted by Iroquois agriculture in the 13–15th century, even higher than the peak concentrations of nearly 36 × 103 cysts/mL associated with Euro-Canadian logging and agriculture. Most of these cysts were attributed to Peridinium inconspicuum Lemmermann and Peridinium volzii Lemmermann, whose cysts have not previously been reported in other palynological studies from this region. The lack of reports of these cysts elsewhere may reﬂect exceptional preservation of cysts and thecae in Crawford Lake, or the failure of palynologists to notice these relatively small, nondescript cysts and recognize their afﬁnity.
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Biological and Geological Perspectives of Dinoflagellates
This volume provides an overview of current research on fossil and modern dinoflagellates, as well as highlighting research areas for future collaboration, following the DINO9 International Conference in Liverpool. The volume is organized into four themes, with a review paper for each theme written by the key-note speaker. Each theme also includes a future research foci note following discussion during the conference. The contributions are organized into the following sections: environmental change, ecology/palaeoecology, life cycles and diversity, and stratigraphy and evolution. Also included are notes from two workshops: culture experiments and dinocysts as palaeoceanographic tracers. This volume will be of interest to both the biological and Micropalaeontological communities.