Table 1.

Summary description of the key parameters of the model.

parameter	description
mt	the level of extrinsic mortality in the environment in year t
qt	the level of the cue of extrinsic mortality that the individual receives in year t
r	the degree of year-to-year autocorrelation of the level of extrinsic mortality in the environment
v	the validity of qt as a predictor of mt
	the mean of M over evolutionary time
d	the extent to which an adult's mortality prospects are influenced by her exposure to environmental harshness in early life