Fig. 8.

Schematic diagram of temperature controls considered in the heating and chilling based model of dormancy cycling and germling flux. Populations of Alexandrium-like cysts with mean chilling requirement 900 CU and heating requirement 600 DD are forced by seasonally oscillating temperatures. Dormancy cycles of model populations reflect phasing of individual cysts’ dormancy and quiescence periods. Germling fluxes from model populations are calculated as the product of the quiescent fraction of the population and a temperature dependent rate of germination (Anderson et al., 2005a; Fig. 5).