Electronic Supplement 5
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Organisms
Diversity & Evolution 4 (2004) Electronic Supplement 5 |
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Klaus Lunau:
Adaptive radiation and coevolution - pollination
biology case studies.
print version: Org. Divers. Evol. 4(3): 207-224. 2004 (full
article)
electr. suppl.:
Part 1. Male Eucera barbiventris
exhibiting pseudocopulation on the labellum of an Ophrys scolopax
flower.
Part 2. Parts of the perianth
of the Aristolochia arborea flower mimic the hat-like shape of a
mushroom of the genus Marasmius.
Part 3. Mimicry of pollen and stamen signals in Iris
species. (Colour plate). pdf-format, 198 KB
Abstract:
The impact of coevolutionary interaction between
species on adaptive radiation processes is analysed with reference to
pollination biology case studies. Occasional colonization of archipelagos can
bring together coevolving partners and cause co-radiation of the colonizing
species, e.g. the drepanidids and the lobelioids on Hawaii. Permanent
reciprocal selective pressure between pairs of coevolving species can lead to a
coevolutionary race and rapid evolutionary change. This is exemplified by
spurred flowers and long-tongued flower-visitors. The geographic patterning of
diffuse coevolution systems can lead to dramatic changes in species
interactions. In different populations, interaction between pollinating and
seed-parasitizing Greya moths and their host plants varies from
mutualism to commensalism and antagonism, depending on the presence of
co-pollinators. Asymmetrical coevolution between angiosperms and oligolectic
flower-visitors may facilitate rapid reproductive isolation of populations
following a food-plant switch, if the oligoleges use their specific food plants
as the rendezvous sites. Diffuse coevolution between angiosperm species and
pollinating insects may cause frequent convergent evolution of floral traits
such as nectar reward instead of pollen reward, floral guides, zygomorphic
flowers, or mimicry of pollen signals, since the multiple plant species
experience similar selective pressures via the coevolving partners. Patterns of
angiosperm adaptive radiation are highlighted in the context of coevolution
with pollinators.
Key words: Coevolution; Adaptive radiation; Pollination; Key innovation; Zoophily
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