Importance of Mixing, Thermal Stratification and Light Adaptation for Phytoplankton Productivity in Lake Tahoe (California-Nevada)

Ecology ◽  
1978 ◽  
Vol 59 (4) ◽  
pp. 810-821 ◽  
Author(s):  
Max M. Tilzer ◽  
Charles R. Goldman
Keyword(s):  
Thermal Stratification ◽  
Light Adaptation ◽  
Lake Tahoe ◽  
Phytoplankton Productivity

Thermal stratification, nutrient dynamics, and phytoplankton productivity during the onset of spring phytoplankton growth in Lake Baikal, Russia

Hydrobiologia ◽  
1996 ◽  
Vol 331 (1-3) ◽  
pp. 9-24 ◽  
Author(s):  
Charles R. Goldman ◽  
James J. Elser ◽  
Robert C. Richards ◽  
John E. Reuters ◽  
John C. Priscu ◽  
...  
Keyword(s):  
Lake Baikal ◽  
Thermal Stratification ◽  
Nutrient Dynamics ◽  
Phytoplankton Growth ◽  
Phytoplankton Productivity

An investigation into iron-stimulated phytoplankton productivity in epipelagic Lake Erie during thermal stratification using trace metal clean techniques

2000 ◽  
Vol 57 (1) ◽  
pp. 86-95 ◽  
Author(s):  
Michael R Twiss ◽  
Jean-Christian Auclair ◽  
Murray N Charlton
Keyword(s):  
Thermal Stratification ◽  
Lake Erie ◽  
Low Frequency ◽  
Phytoplankton Productivity ◽  
Eastern Basin ◽  
Basin Surface ◽  
Enrichment Experiments ◽  
Heat Budgets ◽  
Periodogram Analysis ◽  
Height Data

We tested the hypothesis that phytoplankton productivity in pelagic Lake Erie is limited by low Fe bioavailability during the period of thermal stratification. Iron enrichment (20 and 200 nM Fe) of water sampled from the eastern basin surface water (5 m depth) in July 1996 revealed a dramatic 180 and 30% increase in the standing crop of the picoplankton (0.2-2 µm) and nanoplankton (2-20 µm) size fractions, respectively. Light-saturated rates of photosynthesis for picoplankton increased 2.8 times that of the controls within 24 h. In contrast, simultaneous P and Fe enrichment experiments carried out in July 1997 and August 1998 with water samples from three pelagic stations revealed that P enrichment alone stimulated phytoplankton growth, although at several stations, phytoplankton yield was greater in combined P- and Fe-amended experiments relative to P-enriched treatments. Periodogram analysis of meteorological buoy wave height data and heat budgets calculated from thermal profiles in the eastern basin revealed important interyear differences in precruise conditioning of the epilimnion. Low-frequency, turbulent mixing events that characterized the 30-day precruise period in the years 1997 and 1998 relative to 1996 may have prevented Fe-stressed conditions in the phytoplankton community studied in 1997 and 1998.

Electron Microscopy in the Study of Natural Phytoplankton Assemblages

1985 ◽  
Vol 43 ◽  
pp. 620-623
Author(s):  
Linda Sicko-Goad
Keyword(s):  
Electron Microscopy ◽  
Aquatic Environment ◽  
Size Range ◽  
Physical Parameters ◽  
Specific Information ◽  
Phytoplankton Assemblages ◽  
Phytoplankton Productivity ◽  
Ecosystem Effects ◽  
Time Of Year ◽  
Species Specific

Although the use of electron microscopy and its varied methodologies is not usually associated with ecological studies, the types of species specific information that can be generated by these techniques are often quite useful in predicting long-term ecosystem effects. The utility of these techniques is especially apparent when one considers both the size range of particles found in the aquatic environment and the complexity of the phytoplankton assemblages.The size range and character of organisms found in the aquatic environment are dependent upon a variety of physical parameters that include sampling depth, location, and time of year. In the winter months, all the Laurentian Great Lakes are uniformly mixed and homothermous in the range of 1.1 to 1.7°C. During this time phytoplankton productivity is quite low.

Lake Tahoe

1884 ◽  
Vol 17 (433supp) ◽  
pp. 6918-6918
Keyword(s):  
Lake Tahoe
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