The Annual Distribution and Stratification of Phytoplankton at Aurora Lake, Portage County, Ohio

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dc.creator Marshall, Harold G. en_US 2005-10-01T01:06:19Z 2005-10-01T01:06:19Z 1965-07 en_US
dc.identifier.citation The Ohio Journal of Science. v65 n4 (July, 1965), 190-202 en_US
dc.identifier.issn 0030-0950 en_US
dc.description Author Institution: Old Dominion College, Norfolk, Virginia en_US
dc.description.abstract A 13-month study of a hard-water lake in northeast Ohio has provided a quantitative and qualitative record of the seasonal changes of the phytoplankton. Maximum production occurred during the summer and winter periods. The summer pulse was dominated by the cyanophyte species: Microcystis aeruginosa, Anabaena spiroides, A. circinalis, and A phanizomenon flos-aquae. The dominants of the winter pulse were the diatoms Fragilaria crotonensis and Asterionella formosa, which formed separate peaks under an ice cover in December and January, respectively. The January development extended into March with the highest concentrations for the year being reached at approximately 1,400,000 cells per liter. The Chlorophyta were represented by 34 species, but quantitatively were of minor importance. The Pyrrophyta were uncommon and were represented by only 3 species. Periods of maximum and minimum phytoplankton development correspond closely in duration and magnitude at the surface and at one meter, with a slight tendency for pulses at two meters to lag behind. Vertical distribution indicated that the cyanophyte species, Phacus sp., and Fragilaria crotonensis were more numerous in the upper layers, whereas Asterionella formosa, Synedra sp., Closterium sp., and Melosira granulata occurred in greater numbers in the lower strata. Microcystis aeruginosa was noted to change its level of greatest concentration with the seasons. en_US
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dc.format.mimetype application/pdf
dc.language.iso en_US
dc.rights Reproduction of articles for non-commercial educational or research use granted without request if credit to The Ohio State University and The Ohio Academy of Science is given. en_US
dc.title The Annual Distribution and Stratification of Phytoplankton at Aurora Lake, Portage County, Ohio en_US