Expected coevolution of thermal preference and fitness. Under the coadaptation hypothesis, organisms are expected to prefer a narrow range of temperatures (Tp) that corresponds to, but is slightly lower than , body temperatures that maximize their fitness (Tmax). A) If this hypothesis is valid, populations with relatively high Tp will have relatively high Tmax, as depicted here. B) However, the thermal sensitivity of Lifetime Reproductive Success (LRS) is generally shifted to a lower temperature than that maximizing the intrinsic rate of increase (r) (see ); thus, the Tp of a given population can correspond with TLRS-max or Tr-max.
Anderson et al. BMC Evolutionary Biology 2011 11:157 doi:10.1186/1471-2148-11-157