Diaz, A. and Kite, G. C., 2005. Why be a rewarding trap? The evolution of floral rewards in Arum (Araceae), a genus characterised by saprophilous pollination systems. Biological Journal of the Linnean Society, 88 (2), pp. 257-268.
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Official URL: http://www.blackwell-synergy.com/doi/abs/10.1111/j...
Plant species of the genus Arum typically have lure-and-trap pollination systems that are saprophilous (i.e. attracting flies or beetles searching for breeding sites in decaying organic matter). They have been assumed to always attract and trap their pollinators by deception because the inflorescences provide unsuitable breeding grounds for pollinators. The present study explored the possibility that one species, Arum creticum Boiss. & Heldr., which has yellow, sweet-smelling inflorescences, rewards its pollinators and that this increases its success in attracting pollinators over its close relative, Arum idaeum Coust. & Gadoger. The relationship between rewards provided, floral structure, insect attraction, and pollen import and export was examined in two naturally occurring sympatric populations of A. creticum, A. idaeum, and their natural hybrids. The results showed that plants providing more pollen were visited by larger numbers of females of a mining bee Lasioglossum marginatum Brullé as well as adults and nymphs of a hemipteran bug Dionconotus cruentatus creticus Heiss. In A. creticum, L. marginatum was found to be a better outcrossing vector than D. cruentatus in areas where both pollinators occurred because L. marginatum individuals carried more pollen on their bodies and travelled greater distances between inflorescences, thus increasing the potential for outcrossing. The finding that floral rewards may result in increased fitness, compared to nonrewarding systems that rely on attracting saprophilic pollinators, suggests that it is possible for rewarding species to evolve from saprophilous systems.
|Uncontrolled Keywords:||Breeding system, Dionconotus, inflorescence odour, Lasioglossum|
|Subjects:||Geography and Environmental Studies|
|Group:||School of Applied Sciences|
|Deposited By:||INVALID USER|
|Deposited On:||26 Apr 2007|
|Last Modified:||07 Mar 2013 14:35|
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