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. 2010 Dec 20;108(1):197–202. doi: 10.1073/pnas.1008204108

Fig. 1.

Fig. 1.

A simple example plant–pollinator interaction network consisting of three plant species and two pollinator species. A pointed (flat) tip indicates a positive (negative) interaction. Pollinator 2 is a generalist in that it successfully pollinates all three plants, although it cannot feed from plant 1, as its proboscis length (λ) is significantly shorter than the nectar depth (λ) of plant 1.