Table 4.

Statistics available for each climate variable describing the niche position and breadth for the butterflies in Europe.

Name	Definition	Interpretation
mean	Mean value of climate variable across the species’ range	‘Optimal’ climatic conditions; niche position
ci.95.low	Lower 95% confidence interval for the mean	Uncertainty of the mean
ci.95.up	Upper 95% confidence interval for the mean	Uncertainty of the mean
min	Minimum value of the climate variable across the species range	Lower climatic limit
max	Maximum value of the climate variable across the species range	Upper climatic limit
sd	Standard deviation of the climate variable across the species range	Niche breadth