MadSci Network: Environment

Re: How does temperature affect the heartrate of Daphnia?

Date: Thu Mar 8 10:30:43 2001
Posted By: Rob Campbell, Ph.D Candidate, Oceanography, University of British Columbia
Area of science: Environment
ID: 984051216.En

Hi Khalika:

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

  • Daphnia and Q10
  • Daphnia and heartrate
  • Hope that helps,
    Rob Campbell, MAD Scientist

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