borderline significantP = 0.0508
The nested effect of the source population within species (populations used for experiments) was also significant for body length (F 2, 97 = 13.78 P < 0.001) and borderline significant for total body length (F 2, 97 = 3.08 P = 0.0508), indicating that despite much variation across populations, D. parvula was consistently smaller than D. retrocurva .