Figure 1.

Possible mating system responses of trees to habitat disturbance, including (a) insufficient pollen/pollinators; (b) increased selfing; (c) increased biparental inbreeding; (d) decreased pollen diversity. Genetically similar trees are represented by colours. Pollination is indicated by lines that show failed pollination by coloured dotted lines followed by a red cross (×); reduced pollination by coloured dotted lines; normal pollination by solid coloured lines; a relative increase in pollination by coloured lines with a green plus (+). Responses (b, increased selfing), (c, increased biparental inbreeding) and (d, decreased pollen diversity) are not mutually exclusive for hermaphroditic and self-compatible species.