Specific status of Keratella cochlearis (Gosse) and K. earlinae Ahlstrom (Rotifera: Brachionidae): morphological and ecological considerations

1979 ◽  
Vol 57 (9) ◽  
pp. 1719-1722 ◽  
Author(s):  
Robert L. Baker
Keyword(s):  
Vertical Distribution ◽  
Birth Rate ◽  
Recent Literature ◽  
Eutrophic Lake ◽  
Seasonal Abundance ◽  
Western Canada ◽  
Keratella Cochlearis ◽  
Stable Species ◽  
Shallow Eutrophic Lake ◽  
Two Populations

Keratella cochlearis and K. earlinae were found to coexist in a shallow eutrophic lake in western Canada. Differences between the two populations were found with respect to size, shape, seasonal abundance, birth rate, and vertical distribution. Results suggest that the two populations represent stable species and not ecophenotypes as suggested by recent literature.

Birth rate of planktonic rotifers in relation to food concentration in a shallow, eutrophic lake in western Canada

1979 ◽  
Vol 57 (6) ◽  
pp. 1206-1214 ◽  
Author(s):  
Robert L. Baker
Keyword(s):  
Birth Rate ◽  
Environmental Parameters ◽  
Eutrophic Lake ◽  
Food Concentration ◽  
Western Canada ◽  
Birth Rates ◽  
Keratella Cochlearis ◽  
Shallow Eutrophic Lake ◽  
Keratella Quadrata ◽  
Planktonic Rotifers

Population dynamics and birth rates of Keratella quadrata, Keratella cochlearis, Keratella earlinae, Pompholyx sulcata, and Brachionus angularis were studied in a shallow eutrophic lake of western Canada during 1975–1976. The Keratella species were collected throughout the year with maximum population densities in spring and fall. Pompholyx sulcata and B. angularis were common only during summer months.An extensive correlation analysis involving 'lagged' variables was performed to ascertain relations between birth rates and environmental parameters (temperature and food). Birth rates of all five species were positively correlated with temperature. Concentrations of certain phytoplankton (Rhabdomonas, Rhodomonas, Chlamydomonas, and Ankistrodesmus) were positively correlated with Keratella birth rates. Birth rates of K. cochlearis and P. sulcata were positively correlated with concentration of bacteria. Correlations involving 'lagged' variables were often different from those using 'simultaneous' variables.

Testing aluminum addition as a tool for lake restoration in shallow, eutrophic Lake Sønderby, Denmark

Hydrobiologia ◽  
2003 ◽  
Vol 506-509 (1-3) ◽  
pp. 781-787 ◽  
Author(s):  
Kasper Reitzel ◽  
Jonas Hansen ◽  
Henning S. Jensen ◽  
Frede Ø. Andersen ◽  
Kjeld S. Hansen
Keyword(s):  
Lake Restoration ◽  
Eutrophic Lake ◽  
Aluminum Addition ◽  
Shallow Eutrophic Lake

Growth and buoyancy of Microcystis aeruginosa Kütz. emend. Elenkin in a shallow eutrophic lake

1973 ◽  
Vol 184 (1074) ◽  
pp. 29-50 ◽  
Keyword(s):  
Microcystis Aeruginosa ◽  
Thermal Stratification ◽  
Control Mechanism ◽  
Euphotic Zone ◽  
Eutrophic Lake ◽  
Growth Surface ◽  
Progressive Deterioration ◽  
Exponential Increase ◽  
Shallow Eutrophic Lake ◽  
Buoyancy Control

The growth of Microcystis aeruginosa in a small, shallow eutrophic lake was studied during three consecutive seasons. The alga was shown to be continuously present in the plankton throughout the period. Exponential increase in the population was confined to a 5 to 8-week period, following the onset of thermal stratification. Populations appeared to originate near the bottom of the euphotic zone. The possession of an effective light-dependent buoyancy control mechanism enabled the alga to maintain station, though progressive deterioration of the photic conditions forced populations to rise and become dissipated within the epilimnion. Buoyancy increased after the cessation of growth; surface blooms often led to the physical removal of a majority of colonies to lee shores. Surviving colonies became generally less buoyant after the lake destratified in autumn.

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