Colony development in galls of Nipponaphis monzeni for the first 15 months. Vertical lines indicate the range for the number of aphids per gall. The sample sizes are 20, 17, 20, 21, 13, 20, 15, 17, 23, 25, 17, 29, 20, 13, 9, and 20 from the left to right. The ages are calculated based on the assumption that all galls were initiated on 15 June.
