Table 1.

A hypothetical interaction matrix showing a perfectly nested set of species relationships. In this example, species which interact are coded 1, those which do not are designated 0. Species are ranked (top to bottom and left to right) from most ecologically generalized (large numbers of partners) to most ecologically specialized (small number of partners). Specialists interact with species which are a subset of those with which the generalists interact.

	species 1	species 2	species 3	species 4	species 5	species 6	species 7
species a	1	1	1	1	1	1	1
species b	1	1	1	1	1	1	0
species c	1	1	1	1	1	0	0
species d	1	1	1	1	0	0	0
species e	1	1	1	0	0	0	0
species f	1	1	0	0	0	0	0
species g	1	0	0	0	0	0	0