This function calculates an often-used variant of the original formula to
determine effectiveness of temperature regulation of Hertz et al. (1993).
The concerning variant was proposed by Blouin-Demers & Weatherhead (2001),
who argued that interpretation of the formula of Hertz et al. (1993) is
confounded by the fact that different combinations of the mean thermal
quality of the habitat (de) and mean accuracy of temperature regulation (db)
might lead to similar E values. As such, Blouin-Demers & Weatherhead (2001)
proposed use of E = de - db, which quantifies the extent of departure from
perfect thermoconformity. Positive E values indicate active temperature
regulation, negative values represent active avoidance of suitable thermal
habitat, and values around 0 suggest thermoconformity.
The thermal quality of the habitat (de) and accuracy of temperature
regulation (db) are calculated as part of this formula, so it is not
necessary to run
before running this function.
calculate_E_blouin(te, tb, tset_low, tset_up)
A vector containing operative temperatures.
A vector containing body temperature measurements.
Lower boundary of a species or population set-point range that was determined through thermal preference trials in a temperature gradient. This may be a named double vector containing the lower boundary value, or simply the value itself.
Upper boundary of the set-point range.
Effectiveness of temperature regulation (E) sensu Blouin-Demers and Weatherhead (2001).
Blouin-Demers, G., & Weatherhead, P. J. (2001). Thermal ecology of black rat snakes (Elaphe obsoleta) in a thermally challenging environment. Ecology, 82 (11), 3025-3043.
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