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Alternatively, Aigner has suggested that specialization even to a relatively inefficient pollinator can occur if it results in a net fitness increase. For example, Bloch et al.
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To test hypotheses about floral adaptation, Aigner has advocated the study of model systems with a range of floral phenotypes. However, the study of adaptive potential in floral evolution has been hampered by the fact that traits under directional or stabilizing selection tend to lose their variance in natural populations Fenster, ; Herrera, Ironically, natural, heritable variation in floral colour, scent or shape, considered the sine qua non for adaptive evolution via natural selection Endler,often is found to have neutral or non-significant effects on plant reproductive fitness e.
Thus, it can be difficult to explore the potential for pollinator-mediated selection if there is not sufficient floral variation left upon which selection can act. There are several opportunities to observe incipient phenotypic sorting: These approaches share the common goal of measuring the extent to which variation in floral traits could be moulded by pollinator-mediated natural selection.
The South American cactus genus Echinopsis contains several highly variable taxa, including the E.
Owing to its dramatic phenotypic variability, numerous names have been assigned to different populations of E. Here we focus on the white-flowered populations, i.
Preliminary molecular phylogenetic analyses confirm the monophyly of E. Thus, the plants studied here represent a cluster of closely related entities undergoing unusual phenotypic sorting, and present a rare opportunity to study floral trait combinations not often observed in nature.
Flowers of the populations included in this study are white to slightly pink in some cases and funnel-shaped with highly variable tube length, and thus have been assumed to bloom nocturnally and to be moth-pollinated Lowry, However, as the shortest flowers do not resemble typical hawkmoth-pollinated cactus flowers e. We tested specific predictions concerning floral trait combinations and associated pollinator affinities among 11 populations of E.
If floral variation is not adaptive, we should fail to reject the null hypothesis of random association between floral traits and visitor assemblages. Alternatively, if flowers of different populations are adapted to different pollinator groups, anthesis time and nectar production should vary in concert with floral length as follows: In contrast, we have no clear predictions based on pollination syndromes for two populations of E.
One possibility is for bimodal pollination by sphingid moths and bees seeking nectar and pollen, respectively see Barthell and Knops, ; Miyake and Yahara, A second possibility is for pollination by a novel class of pollinator or functional group see Fenster et al.
A third possibility is that unusual combinations of floral traits may be discriminated against by potential pollinators due to incompatibility of floral rewards or mechanical fit with visitors e. These PowerPoint backgrounds for youth services will help you preach an engaging and relevant message for young people. Maybe we never will. Watching any good TV series at the moment.
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