Figure 2.
Daphnia age at maturation and population growth rate as a function of temperature. (a) Age at maturation. The lake type × temperature interaction was marginally non-significant (F2,8 = 3.85, p = 0.068). Closed circles, anadromous; open squares, landlocked; grey triangles, no alewife. (b) Intrinsic rates of increase (r) at 12°C and 25°C. Closed circles, 25°C; open circles, 12°C. (c) Changes in population size at 12°C over a two month period that approximates the typical period of population growth in anadromous lakes. Closed circles, anadromous; open squares, landlocked; grey triangles, no alewife. Error = ±1 s.e.