FIGURE 3. Comparison of Drosophila populations in cold three-species clines with or without L.boulardi parasitoids.

From the following article:

Making mistakes when predicting shifts in species range in response to global warming

Andrew J. Davis, Linda S. Jenkinson, John H. Lawton, Bryan Shorrocks and Simon Wood

Nature 391, 783-786(19 February 1998)

doi:10.1038/35842