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Il Fitoplancton del lago Cixerri nei primi cinque anni di esistenza

Sechi, Nicola and Buscarinu, Paola and Pilo, Emanuela and Lugliè, Antonella Gesuina Laura (1998) Il Fitoplancton del lago Cixerri nei primi cinque anni di esistenza. In: A.I.O.L. 1996: Atti del 12. Congresso dell'Associazione Italiana di Oceanologia e Limnologia, 18-21 Settembre 1996, Isola di Vulcano, Italia. Genova, [s.n.]. Vol. 2. p. 41-51. Conference or Workshop Item.

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Abstract

Between May 1990 and June 1995 a study on phytoplankton of Lake Cixerri (South-West Sardinia) was carried out. This is a shallow man-made lake, filled in February 1990; it is polimitic and eutrophic (Sechi et al. 1994). During the five years studied, the annual mean values of total density, total biomass and chlorophyll a varied respectively from 308 x 106 cell. l-1 in 1991-1992 to 22 x 106 cells l-1 in 1994-1995, from 5 mg l-1 in 1990-1991 to 23 mg l-1 in 1991-1992 and from 20.1 mg m-3 in 1992-1993 to 57.8 mg m-3 in 1994-1995. The number of the most abundant species increased from 16 in the first year to 33 in the last year. Cyanophyceae were the most abundant group and the Cyanophyceae and the Dinophyceae had the greatest biomass; only in 1994-1995 these two groups decreased and the Chlorophyceae increased in density, biomass and number of species. A general seasonal succession of phytoplankton is proposed with Cyanophyceae dominant in numbers in spring, summer and autumn and the Dinoflagellates dominant in biomass in summer and fall; between 1992 and 1994 there was a year-round vegetation of Oscillatoria spp., whereas in 1994-1995 the Chlorophyceae had the maximum growth. It is possible that the lake is still unstable because of its recent formation, and that the high variability of hydrological, hydraulic and management factors might influence the phytoplankton dynamics making its study and interpretation very difficult.

Item Type:Conference or Workshop Item (Contribute)
ID Code:8853
Status:Published
Uncontrolled Keywords:Fitoplancton, stato trofico, laghi artificiali, Sardegna
Subjects:Area 05 - Scienze biologiche > BIO/07 Ecologia
Divisions:001 Università di Sassari > 01 Dipartimenti > Scienze botaniche, ecologiche e geologiche
Publisher:[s.n.]
Deposited On:10 Apr 2013 09:34

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