Positioning changes of mayfly nymphs due to behavioral regulation of oxygen consumption

1980 ◽  
Vol 58 (4) ◽  
pp. 618-622 ◽  
Author(s):  
Michael J. Wiley ◽  
Steven L. Kohler
Keyword(s):  
Oxygen Consumption ◽  
Dissolved Oxygen ◽  
Oxygen Concentration ◽  
Field Conditions ◽  
Experimental Investigations ◽  
Behavioral Patterns ◽  
Behavioral Regulation ◽  
Dissolved Oxygen Concentration ◽  
Habitat Distribution ◽  
Renewal Rate

Experimental investigations in a small artificial stream showed that the positioning of mayfly nymphs (Ephemeroptera) on stones varied with dissolved oxygen concentration (DO). At low DO levels nymphs moved to current-exposed positions, presumably to increase the renewal rate of oxygen at respiratory exchange surfaces. The expected magnitude of positioning changes under field conditions was determined and suggests that behavioral regulation of oxygen consumption may commonly influence both habitat distribution and diel behavioral patterns. The implications of these results to drift studies are also discussed.

Method for determining oxygen consumption rates of static cultures from microplate measurements of pericellular dissolved oxygen concentration

2004 ◽  
Vol 86 (7) ◽  
pp. 775-787 ◽  
Author(s):  
Richard D. Guarino ◽  
Laura E. Dike ◽  
Tariq A. Haq ◽  
Jon A. Rowley ◽  
J. Bruce Pitner ◽  
...  
Keyword(s):  
Oxygen Consumption ◽  
Dissolved Oxygen ◽  
Oxygen Concentration ◽  
Dissolved Oxygen Concentration ◽  
Consumption Rates

scholarly journals Method for determining oxygen consumption rates of static cultures from microplate measurements of pericellular dissolved oxygen concentration

2005 ◽  
Vol 91 (3) ◽  
pp. 392-392 ◽  
Author(s):  
Richard D. Guarino ◽  
Laura E. Dike ◽  
Tariq A. Haq ◽  
Jon A. Rowley ◽  
J. Bruce Pitner ◽  
...  
Keyword(s):  
Oxygen Consumption ◽  
Dissolved Oxygen ◽  
Oxygen Concentration ◽  
Dissolved Oxygen Concentration ◽  
Consumption Rates

The Effects of Dissolved Oxygen Concentration, Fractional Oxygen Consumption, and Additives on JP-8 Thermal Stability

1997 ◽  
Vol 119 (4) ◽  
pp. 822-829 ◽  
Author(s):  
J. S. Ervin ◽  
T. F. Williams ◽  
S. P. Heneghan ◽  
S. Zabarnick
Keyword(s):  
Thermal Stability ◽  
Oxygen Consumption ◽  
Heat Exchanger ◽  
Dissolved Oxygen ◽  
Oxygen Concentration ◽  
Jet Fuel ◽  
Combined Effects ◽  
Fuel System ◽  
Dissolved Oxygen Concentration ◽  
Additive Package

Since dissolved oxygen participates in fuel deposit formation, knowledge of the effects of dissolved oxygen concentration on fuel thermal stability is critical for fuel system design. In this work, the combined effects of dissolved oxygen availability and additives on jet fuel thermal stability are studied. Experiments with JP-8 jet fuel were conducted in a three-part heat exchanger that simulated a complex thermal and flow environment. The dissolved oxygen content at the flow inlet was varied, and deposition was studied under conditions of either fractional or complete oxygen consumption. The effects of a thermal stability additive package were also studied. An intriguing result found with JP-8 fuels is an increase in deposits formed in heated regions for decreased oxygen consumption, but inverse behavior with the additive package.

scholarly journals Oxygen consumption of Litopenaeus vannamei juveniles in heterotrophic medium with zero water exchange

2009 ◽  
Vol 44 (5) ◽  
pp. 534-538 ◽  
Author(s):  
Luis Vinatea ◽  
Alfredo Olivera Gálvez ◽  
Jesús Venero ◽  
John Leffler ◽  
Craig Browdy
Keyword(s):  
Oxygen Consumption ◽  
Dissolved Oxygen ◽  
Oxygen Concentration ◽  
Litopenaeus Vannamei ◽  
Water Exchange ◽  
Consumption Rate ◽  
Light Conditions ◽  
Dissolved Oxygen Concentration ◽  
Dark Conditions ◽  
Over Time

This work aimed at determining the dissolved oxygen consumption rate of Litopenaeus vannamei juveniles maintained in a microbial biofloc raceway system at high density with no aeration. Three 4 L bottles were filled for each treatment, sealed hermetically, and placed in an enclosed greenhouse raceway system. Four shrimp (13.2±1.42 g) were assigned to two sets of the bottles, which underwent the following treatments: light conditions with no shrimp; dark conditions with no shrimp; light conditions with shrimp; and dark conditions with shrimp. Dissolved oxygen content was measured every 10 min for 30 min. A quadratic behavior was observed in dissolved oxygen concentration over time. Significant differences for oxigen consumption were observed only at 10 and 20 min between shrimp maintained in the dark and those under light conditions. At 10 min, a higher value was observed in shrimp maintained under light, and at 20 min, in the dark. Significant differences between 10 and 20 min and between 10 and 30 min were observed when oxygen consumption was analyzed over time in the presence of light. Under dark conditions there were significant differences only between 20 and 30 min. Lethal oxygen concentration (0.65 mg L-1) would be reached in less than one hour either under light or dark conditions with no aeration.

scholarly journals The Effects of Dissolved Oxygen Concentration, Fractional Oxygen Consumption, and Additives on JP-8 Thermal Stability

1996 ◽  
Author(s):  
J. S. Ervin ◽  
T. F. Williams ◽  
S. P. Heneghan ◽  
S. Zabarnick
Keyword(s):  
Thermal Stability ◽  
Oxygen Consumption ◽  
Heat Exchanger ◽  
Dissolved Oxygen ◽  
Oxygen Concentration ◽  
Jet Fuel ◽  
Combined Effects ◽  
Fuel System ◽  
Dissolved Oxygen Concentration ◽  
Additive Package

Since dissolved oxygen participates in fuel deposit formation, knowledge of the effects of dissolved oxygen concentration on fuel thermal stability is critical for fuel system design. In this work, the combined effects of dissolved oxygen availability and additives on jet fuel thermal stability are studied. Experiments with JP-8 jet fuel were conducted in a three-part heat exchanger which simulated a complex thermal and flow environment. The dissolved oxygen content at the flow inlet was varied, and deposition was studied under conditions of either fractional or complete oxygen consumption. The effects of a thermal stability additive package were also studied. An intriguing result found with JP-8 fuels is an increase in deposits formed in heated regions for decreased oxygen consumption, but inverse behavior with the additive package.

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