402 John Woods
b)
End of year 1
6
11
16
21
26
o
10
20
30
Fig. 18.5 (continued) b) Mutation experiment (from Woods aud Barkmann 1985). The
abscissa refers to parameter "e" in the text. Distribution ofvarieties in parameter space at the
end ofthe first year in each 1ap ofthe five-year circuit around the Sargasso Sea (Fig. 18.7).