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. 2012 Jul 30;7(7):e42097. doi: 10.1371/journal.pone.0042097

Figure 4. Directional changes in temperature in North America, 1930–2004, with respect to the existing LD50 niche.

Figure 4

(A) The contemporary environmental space showing grid cells that moved either toward or away from the existing LD50 niche centroid due to directional changes in minimum temperature of the coldest month or maximum temperature of the warmest month (colored grid cells, legend in panel C); grid cells that did not experience directional change are not shown. Labeled regions delineate four environmental spaces with respect to different thermal niche fitness thresholds for the house sparrow (see Fig. 3). (B) Pie charts show the proportions of grid cells moving either toward or away from the existing LD50 niche centroid within each of the four spaces. (C) Geographic projection of grid cells that moved either toward or away from the existing LD50 niche centroid of the house sparrow. Positive (+)  =  moving toward the niche centroid, negative (–)  =  moving away from the niche centroid.