Table 1. Summary of potential impacts.

	A2 emissions scenario			B2 emissions scenario
	GFDL	HadCM3	ECHAM4	GFDL	HadCM3	ECHAM4
D (km)	361	707	882	258	545	680
	25–1825	20–2153	89–3578	25–1342	54–2477	58–2436
θ (° from N)	342·8°	11·7°	45·0°	341·3°	9·3°	27·8°
V (km yr−1)	4·41	6·55	6·62	3·61	5·14	5·87
	0·46–21·72	0·43–23·06	0·37–24·85	0·44–22·13	0·46–24·26	0·37–23·05
R	0·722	0·757	0·892	0·812	0·805	0·803
O	0·429	0·312	0·475	0·528	0·394	0·375
R0	5	8	22	4	6	21
R10	1	22	25	1	8	9
O0	18	54	59	13	27	43
O10	27	65	78	14	51	60
N	0·874	0·848	0·768	0·932	0·914	0·858
N′	0·657 (2881)	0·516 (3074)	0·436 (3550)	0·733 (3067)	0·602 (3145)	0·520 (3521)

D geodesic distance (mean, minimum and maximum) between centroids of range simulated for present climate and of potential range simulated for future climate scenario

θ mean bearing of initial azimuth for geodesic path between centroids of range simulated for present climate and of potential range simulated for future climate scenario

V rate of range boundary adjustment (mean, minimum and maximum) necessary to achieve potential range displacement

R mean extent of potential future range, measured as number of potentially occupied grid cells, expressed as a proportion of simulated present range

O extent of overlap between potential future range and simulated present range, expressed as a proportion of simulated present range extent

R₀ number of species with zero potential future range extent in Europe

R₁₀ number of species with a non-zero potential future range extent in Europe that is less than one tenth of the extent of their simulated present range

O₀ number of species with zero overlap between potential future range and simulated present range

O₁₀ number of species with a non-zero overlap between their potential future range and simulated present range that is less than one tenth of the extent of the latter

N mean potential future species number per grid cell as a proportion of mean present species number per grid cell, assuming ‘perfect’ dispersal

N′ mean potential future species number per grid cell as a proportion of mean present species number per grid cell, assuming ‘dispersal failure’; (number of grid cells used to calculate N and N′ is shown in parentheses)