| http://www.w3.org/ns/prov#value | - Rather than a priori assume that a particular type of interaction is dominating the structure and functioning of a particular ecosystem, we need new ways to quantify the relative importance of different main types of interaction as shown in figure 1, and new approaches to study their interplay.(b) Keystone species or keystone interactions?Ecologists recognized early on that not all species or all
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