Female choice selects for lifetime lekking performance in black grouse males

'Good genes' models assume that females can use a signal such as mating eff ort to assess a male's lifetime fitness. Inferring long-term performance fr om short-term behavioural observations can be unreliable, and repeated samp ling may be needed for more accurate assessment of males. Additionally, if sexual advertisement is viewed as a life-history trait subject to trade-off s, reliable comparison of mates should yield information on all life-histor y components rather than on one trait value in one season. We show that in the lekking black grouse (Tetrao tetrix), a male's success is best explaine d by assuming that females are informed of the past history of males up to the beginning of the study (eight years). Much of this extremely lasting 'm emory' can be attributed to females observing long-term outcomes of male-ma le competition: current territory position is the only momentarily observab le variable that has high power in predicting female choice, and it correla tes to a male's past lekking effort on a cumulative lifetime scale. We conc lude that females can use territory position as a signal that conveys infor mation of a male's lifetime performance that combines lekking effort and lo ngevity. Females may thus overcome the problem of male allocations varying in time, without the need to pay costs associated with repeated sampling.