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Animals moved to a new temperature and kept there for several days often show some compensation in their rate functions, especially metabolic rate. One of the classic treatments of how individuals adjust to a new temperature is that of Precht (1958) who identified five responses (Figure 2.4). Animals were maintained initially at temperature T₂ and moved to T₁ or T₃. Metabolic rates were monitored during the acclimation process.

 Type 4 acclimation: no change in rate occurs after time for acclimation (Q10 = 2–3).

 Type 2 acclimation: the animal’s rate falls or rises to original rate (Q10 = 1)

 Type 3 acclimation: somewhere in between (Q10 = 1–2)

 Type 1 acclimation: overcompensation – rate lower at higher temperature (Q10 < 0)

 Type 5 acclimation: reverse compensation (Q10 > 3)

Figure 2.4 Precht’s patterns of temperature acclimation. Animals are acclimated at temperature T₂ then transferred to a lower temperature (T₁) or higher temperature (T₃). The five acclimation types are described in the text.

Source: Prosser (1973), figure 9‐13 (p. 375). Reproduced with the permission of Saunders Publishing.

In reality, all five curves are rarely seen. In most cases, the response is type 3 or 4. However, type 2 has been seen in rare cases; it has been documented in some intertidal animals (Newell and Northcroft 1967). The Precht patterns are the simplest way of classifying trends in metabolism vs. temperature, but other useful schemes exist. Prosser (1973) describes species’ response to temperature using a family of metabolism vs. temperature (M‐T) curves instead of Precht’s three points. The advantage of Prosser’s scheme is that it can differentiate varied responses to lowered and raised temperature, and the reader is encouraged to examine Prosser’s curves.