Figure 3
From: Bivalve network reveals latitudinal selectivity gradient at the end-Cretaceous mass extinction
A bipartite occurrence network.
Ostrea lurida, Mytilus californianus and Crassostrea gigas each have a second order relationship with each other (co-occurrence). Japan and Washington have a single second order relationship (shared Crassostrea gigas). Both Ostrea lurida and Mytilus californianus have a single third order relationship with Japan. This does not imply that Ostrea lurida, for example, could occur in Japan, but more third order relationships than we would expect due to chance with Japan is evidence for occurrence potential, or depauperate fossilization.
