another example of an ecological edge would be the edge of a field, say where the field meets the forest and the hedgerow is inbetween and that again is a very abundant area for wildlife and for plants - think of a human example - some border areas, say the city of tijuana, mexican border with united states has a mixture of mexican culture and texan culture but its not just alongside each other, it creates a new culture, it creates new sets of resources, there are different kinds of products, different kinds of activities, different kinds of music, different kinds of language, so texmex is an ecological edge.