Table 1.

Number of studies of broad-scale species richness patterns utilizing range maps (extent > 800 km) by time period and the proportion of those studies examining richness at a resolution of 1° or finer

Time period	Number of studies	Proportion ≤ 1°
1960–1989	7	0.14
1990–1994	5	0.20
1995–1999	12	0.42
2000–2004	23	0.57
2004–2007	26	0.96

Studies were identified from Table 1 of Hawkins et al. (4) by searching the terms ″richness pattern*″ or ″diversity pattern*″ in the ISI Web of Science database and from a handful of other studies with which we were familiar. A complete list of studies is available in supporting information (SI) Table 3.