Figure 4.

Mean overall parasite load (± S.E., large circles) and individual parasite loads (small circles) of surviving fish in segregating families. Parasite load is expressed as GLM residuals with overall parasite load of fish from segregating families as response variable and cage*family as factor. The displayed quadratic polynomial is fitted to the means (R2 = 0.9598, F2,2 = 23.894, P = 0.0402). The lowest parasite load can be found at 6.14 MHC class IIB sequence variants, which matches the predicted optimal MHC diversity from previous studies [12-14]. N indicates sample sizes for each allele class.

Wegner et al. BMC Evolutionary Biology 2008 8:124   doi:10.1186/1471-2148-8-124
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