Light and temperature effects on the growth rate of three freshwater [2pt] algae isolated from a eutrophic lake

Hydrobiologia - Tập 489 - Trang 207-217 - 2002
Radia Bouterfas1, Mouhssine Belkoura2, Alain Dauta3
1Département de Biologie, Faculté des Sciences et Techniques, Université Cadi Ayyad, Marrakech, Morocco
2Laboratoire de Physiologie Végétale, Faculté des Sciences Semlalia, Equipe Biotechnologie Algale, Marrakech, Morocco
3Centre d'Ecologie des Systèmes Aquatiques Continentaux, UMR C.5576 CNRS, Université Paul Sabatier, Toulouse Cedex, France

Tóm tắt

Effects of light and temperature, on the growth of three freshwater green algae isolated from an eutrophic lake and identified as Selenastrum minutum, Coelastrum microporum f. astroidea and Cosmarium subprotumidumwere studied in batch cultures under non-nutrient limited conditions. Experiments were performed to determine the growth rate over a wide range of light intensities (30–456 μmol m−2 s−1) and temperature (15–35°C), using a 15/9 (light/dark) photoperiod cycle. The maximum growth rates and the optimum light intensities at a temperature of 35°C were 1.73 d−1 and 420 μmol m−2 s−1for Selenastrum minutum, 1.64 d−1 and 400 μmol m−2 s−1 for Coelastrum microporum and 1.00 d−1 and 400 μmol m−2 s1 for Cosmarium subprotumidum. The results were fitted with the mathematical models of Steele (1965), Platt & Jassby (1976) and Peeters & Eilers (1978). Steele's function and equation of Platt & Jassby don't describe correctly the relationship between the growth and light intensity. In the opposite, the equation of Peeters & Eilers provides the best fit for the three species.

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Hydrobiologia

Tập 489

207-217

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