Figure 2. Density of Spiroplasma in different Drosophila (per mg fly) across life stages. Values for females (A) and males (B) are an average density of six biological replicates, and the error bars represent standard error. Drosophila species measured include D. mojavensis infected with citri-type non-male-killing Spiroplasma, D. hydei infected with citri-type non-male-killing Spiroplasma, D. hydei infected with non-male-killing poulsonii-type Spiroplasma, and D. melanogaster infected with poulsonii-type male-killing Spiroplasma. The male-killing Spiroplasma infecting D. melanogaster have the highest densities across all life stages, whereas the citri-type Spiroplasma are lower.