|MadSci Network: Environment|
Many biological rates increase exponentially with temperature (as do many chemical reactions). It has long been known for metabolic rates that a ten degree increase in temperature results in approximately a doubling of rates. This is called the van't Hoff rule, after the Dutch chemist Jacobus Henricus van't Hoff.
The Q10 approximation is expressed mathematically as:
Q10 = (K1/K2)10/(t1-t2)
Where K1 and K2 are the rates at temperatures t1 and t2.
Most metabolic rates have a Q10 somewhere between 2 and 3 (a doubling or tripling with an increase in temperature of 10 degrees).
You can see more about daphnia Q10's and daphnia heartrates by checking out the results of these searches at google.com
Hope that helps,
Rob Campbell, MAD Scientist
Try the links in the MadSci Library for more information on Environment .