Table 3. Summary of polymorphism in Wolbachia and mitochondrial genomes in the DGRP sample.

Genome	N	L	S	π	θ	Tajima's D
Wolbachia (Infected strains)	91	1,209,286	205	0.0000106	0.0000334	−2.31443
mtDNA (Infected strains)	91	14,492	115	0.0005337	0.0015749	−2.20772
mtDNA (All strains)	174	14,408	164	0.0004381	0.0019974	−2.48508

N is the number of strains, L is the number of sites analyzed, and S is the number of variable sites. Estimates of π and θ (per site) are based on the number of mutations. All Tajima's D tests had P<0.01 based on 10,000 coalescent simulations that assumed no recombination and were conditioned on the number of variable sites.