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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Hydrobiologia 140 (1986), S. 135-141 
    ISSN: 1573-5117
    Keywords: phytoplankton ; dystrophic ; polyhumic ; meromictic ; flagellates ; phytoplankton ecology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A floristic list of 89 freshwater phytoplanktonic algae occurring in two neighbouring, dystrophic, meromictic Tasmanian lakes is given. In both lakes the preponderance of desmids and phytoflagellates, especially chrysophytes, is a characteristic in keeping with their dystrophic nature. All the alga must be adapted to low levels of red light and some habitually inhabit crepuscular depths rather than executing diel vertical migrations such as happens in many dystrophic waters. Floristic differences between the two lakes are related to morphometric differences and the degree of entrainment of tychoplankton. The photosynthetic biomass of both lakes is predominantly monimolimnetic, made up of few species. The floristically-rich mixolimnion contributes little to biomass. The ecology of the dystrophic flora is discussed in relation to the special circumstances of meromixis.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Hydrobiologia 48 (1976), S. 59-64 
    ISSN: 1573-5117
    Keywords: Primary production ; Trophic state ; Tasmanian lakes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The primary productivity of two turbid, shallow lakes on the Tasmanian Central Plateau was determined by the C14 technique from half-light day incubations in situ. Graphical integration of depth-rate curves gave estimates of areal day rates of production and of annual rates. The 2 lakes are closely adjacent and very similar physically and chemically, but have very different phytoplankton populations. Lake Crescent has ten times the standing crop biomass of Lake Sorell but its greater turbidity restricts light penetration, and production per unit of surface per day and per year is only 2.6 times that of Sorell. With day rates of 25-(44)-93 mgCm−2 and annual production of 16.9 gCm−2 Lake Sorell could be regarded as oligotrophic. Consideration of standing crop biomass and morphometry however indicates oligo-mesotrophy. Lake Crescent with day rates of 35-(115)-250 mgCm−2 and annual production of 45 gCm−2 is moderately eutrophic. Incubations in constant light demonstrated considerable variation in production rates in different parts of Lake Crescent.
    Type of Medium: Electronic Resource
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