The geographical pollinator mosaic

Inbreeding Depression

Pollinators are distributed unevenly in time and space. Indeed, like all animals, pollinators have restricted ranges, which are often determined by both physical factors, such as altitude, temperature, and rainfall, and by biotic factors, such as vegetation structure and availability of flowering plants (Chapters 6 and 15). The landscape in which plants evolve presents a geographical mosaic of pollinators that is hard to visualize, but is no less important for plant evolution than the...

References

Floral specialization without trade-offs optimal corolla flare in contrasting pollination environments. Ecology, 85, 2560-9. Armbruster WS (1985). Patterns of character divergence and the evolution of reproductive ecotypes of Dalechampia scandens (Euphorbiaceae). Evolution 39, 733-52. Armbruster WS, Edwards ME, and Debevic EM (1994). Floral character displacement generates assemblage structure of western Australian triggerplants (Styli-dium). Ecology, 75, 315-29. Ashton PS,...

Direct effects of plant size on fitness gains

Plant size can affect fitness directly, so that returns from a given absolute amount of resources differ for small and large plants Fig. 3.5 . For instance, in a wind-pollinated plant, pollen released from a tall individual may disperse farther and be more successful than pollen from a short individual. Direct effects may also occur in some animal-pollinated plants, because pollinators may prefer taller plants among neighbours Ishii 2004 . With direct effects of plant size, fitness returns per...

Reproductive assurance and selffertilization theoretical context

Despite the obvious advantages of uniparental reproduction, most flowering plants predominantly outcross and relatively few reproduce exclusively via self-fertilization Goodwillie et al. 2005 . Inbreeding depression, the reduced vigour of inbred compared with outbred individuals, is one of the few selective factors strong enough to oppose the automatic selection of selfing Charlesworth and Charlesworth 1987 . Early mathematical models pitting the two-fold gene transmission advantage of selfing...