Reconstructing seasonal range expansion of the tropical butterfly, Heliconius charithonia, into Texas using historical records.

Removal of the two outliers improved the amount of variance explained by the model (76%) and turned into a highly significant relationship (r 2 adj = 0.76, F 1,14 = 49.27, P < 0.0001).

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There was a positive trend, although not statistically significant ( Figure 2 , r 2 adj = 0.12, F 1,16 = 3.41, P = 0.08) between distance and sighting.

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