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2015 ; 10
(12
): e0143443
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Nonrandom Composition of Flower Colors in a Plant Community: Mutually Different
Co-Flowering Natives and Disturbance by Aliens
#MMPMID26650121
Makino TT
; Yokoyama J
PLoS One
2015[]; 10
(12
): e0143443
PMID26650121
show ga
When pollinators use flower color to locate food sources, a distinct color can
serve as a reproductive barrier against co-flowering species. This
anti-interference function of flower color may result in a community assembly of
plant species displaying mutually different flower colors. However, such color
dispersion is not ubiquitous, suggesting a variable selection across communities
and existence of some opposing factors. We conducted a 30-week study in a plant
community and measured the floral reflectances of 244 species. The reflectances
were evaluated in insect color spaces (bees, swallowtails, and flies), and the
dispersion was compared with random expectations. We found that co-existing
colors were overdispersed for each analyzed pollinator type, and this
overdispersion was statistically significant for bees. Furthermore, we showed
that exclusion of 32 aliens from the analysis significantly increased the color
dispersion of native flowers in every color space. This result indicated that
aliens disturbed a native plant-pollinator network via similarly colored flowers.
Our results demonstrate the masking effects of aliens in the detection of color
dispersion of native flowers and that variations in pollinator vision yield
different outcomes. Our results also support the hypothesis that co-flowering
species are one of the drivers of color diversification and affect the community
assembly.