west in the IOC and, to a lesser extent, toward the east in the West Central Pacific and especially the CP (x2 = 26.23 using raw numbers of endemics/nonendemics, df = 5, P < 0.001; Fig. 3.6). Average endemism among the six regions is 20.2 ± 6.1%.
The percent regional endemism increases significantly with regional species richness (Fig. 3.7; r2 = 0.74, P = 0.03, F = 11.41, y = 0.08x + 1.61, square-root-transformed data).
The percent regional endemism is inversely related to body size among regions, decreasing with increased median body size (Fig. 3.7; r2 = 0.65, P = 0.05, F = 7.53, y = 0.10x + 8.16, square-root-transformed data) and increasing with percentage of species in each region that are <40 mm in body size (r2 = 0.68, P = 0.04, F = 8.39, y = 0.08x − 0.15, square-root-transformed data).
Species are concentrated in small body size classes in the IAA and IOC, although the range of body sizes is large in these regions. Typical body sizes are larger in the oceanic regions adjacent to the IAA and IOC but decline (with an absence of large-sized species) toward the CP (Fig. 3.6; number of species >40 mm and <40 mm for all regions, x2 = 11.07, df = 5, P = 0.02).
Hypothesizing that productivity influences body sizes and life histories of reef stomatopods, we further categorized the species in the six regions according to whether they inhabited productive or unproductive