ThomasTRC: Fits a thermal performance curve to data using the formula...

In padpadpadpad/TeamPhytoplankton: For studies into thermal adaptation

Description

Fits a thermal performance curve to data such as the following equation :

Usage

ThomasTRC(a, Topt, w, temp)

Arguments

a	scaling parameter for the curve.
Topt	controls the position of where the quadratic portion reaches its maximum. So in essence z is the Topt.
w	the breadth of thermal performance curve, the range over which the dependent variable is postive
temp	temperature, can be in degrees centigrade or Kelvin

Details

g(T) = a*[1 - ((Topt-T)/(w/2))^2]

where a is a scaling coefficient, Topt is the optimum temperature and w is the range of temperatures over which the rate is positive.

Tmin and Tmax can be calculated by subtracting or adding w/2 to Topt respectively. See Thomas.Tmax and Thomas.Tmin.

Rates need to be in raw form not logged as its important that negative rates are actually negative rates to be able to correctly calculate w

Value

returns the biological rate at a given temperature depending on the parameters controlling the model.

Author(s)

Daniel Padfield

References

Thomas, M.K., Kremer, C.T., Klausmeier, C. a & Litchman, E. (2012) A global pattern of thermal adaptation in marine phytoplankton. Science, 338, 1085–8.

Thomas, M.K., Kremer, C.T. & Litchman, E. (2015) Environment and evolutionary history determine the global biogeography of phytoplankton temperature traits. Global Ecology and Biogeography, 25, 75-86.

See Also

schoolfield.high and schoolfield for fitting alternative thermal response curves.

Examples

temp <- seq(1,30,1)
plot(ThomasTRC(100, 20,20, temp = temp) ~ temp)

padpadpadpad/TeamPhytoplankton documentation built on May 24, 2019, 5:59 p.m.