Effect of maternal age, natal diet and adult diet on offspring size variability in the soil mite, S. berlesei (data from Plaistow et al. 2007). Data are divided into adult food treatments ((a) high, (b) medium and (c) low), and divided within each adult treatment into rearing food treatments (circles and solid line, high; pluses and dashed line, medium; and crosses and dotted line, low).