Figure 1. The heat budget of an ectotherm combines any kind of heat exchange between the organism and its environment to compute the body temperature (TB). Here, the insect receives energy from solar radiation (Qrad), as well as thermal radiation from the atmosphere (QTa). Solar (reflection) and thermal (emission) radiation are sent from the environment like the ground surface (Qgr). The insect body emits itself thermal radiation (QT) proportionally to its TB. Heat is exchanged with ambient air through (forced) convection (Qconv), and heat can be conducted between the insect and the ground surface (Qcond). Finally, heat could be lost during evapotranspiration (Qevap). When TB reaches
Figure 2. Our conceptual approach: combining different models to predict population dynamics of mites from climatic variables taken at the regional scale. The cascade of model considers the microclimatic quality. This biophysical model allows to cross spatial scales (region down to canopy and leaf), as well as functional (from individuals to populations) and trophic scales (plant, herbivore and predator).