Figure 2.

Latitudinal gradients of species diversity in deep-sea isopods, gastropods, and bivalves from the North Atlantic and Norwegian Sea measured as: S, the number species; H′, the Shannon–Wiener information function; and J, Pielou's evenness (18). For bivalves, gastropods, and isopods, respectively, correlation coefficients for S are r = −0.512, r = −0.670, and r = −0.801 (all P < 0.001); for H′, r = −0.597, r = −0.775 and r = −0.829 (all P < 0.001); for J, r = −0.184 (not significant), r = −0.384 (P < 0.05), and r = −0.577 (P < 0.001). Fitted least-square regression lines are shown, except J for bivalves, which is insignificant. Data are from refs. 9, 19, and 20.