Without resorting to irrigation, the families in the two driest villages remained at a disadvantage.
Inferences suggested that the driest periods culminated around a. d. 590, 860, 990, and 1050.
Average annual rainfall was 63 cm, with the driest community receiving 28 cm/year and the wettest 120 cm/year.
There was a substantial difference (215 mm) between the wettest (1999) and driest (2002) cropping season's rainfall.
In contrast, households in the villages in the driest zones, where crop intensification was not feasible, were more likely to specialize.
The last season of the trial, 1994/95, was the driest with a total rainfall of 541 mm, of which only 413 mm or 76% was considered eective.
During the terrestrial phase, the range of photosynthetic assimilation is smaller again, and reductions can occur that are probably related to water shortage in the driest months.
Lithophytic cyanobacteria function as the sole primary producers in the world's driest deserts.
