Figure 2.
Small birds at Yuma AZ, USA, will be exposed to survival times less than 6 h much more frequently during mid-summer in the 2080s (black shade) compared with the 1990s (grey shade). Survival time distributions are shown for three body mass (Mb) values ((a) 5 g, (b) 25 g and (c) 50 g) and dehydration tolerances equivalent to (a(i), b(i) and c(i)) 11 per cent of Mb and (a(ii), b(ii) and c(ii)) 22 per cent of Mb. Survival time distributions were modelled using daily maximum air temperature (Ta) data for the hottest month (July) during the 1990s, and the predicted increase in maximum Ta for this location (IPCC 2007).