Table 2. Results of multiple regressions comparing community dissimilarity with differences in host age, standard length and sIgM concentrations.

Host variable	R2	P-value*
Across all ages
DPF+standard length (total)	0.2818	0.001
DPF+standard length (shared)	0.0775	0.001
DPF (unique)	0.0057	0.029
Standard length (unique)	0.1986	0.001
For 28, 35 and 75 d.p.f. zebrafisha
Standard length+[sIgM] (total)	0.5084	0.001
Standard length+[sIgM] (shared)	0.0495	0.001
Standard length (unique)	0.4427	0.001
[sIgM] (unique)	0.0162	0.037

Abbreviations: DPF, days post fertilization (d.p.f.); sIgM, secreted immunoglobulin M.

^aThese ages had measurable sIgM transcript levels and shared husbandry conditions.

*P-values were calculated from a distribution of 1000 random permutations.