Pollinator visitation patterns strongly influence among-flower variation in selfing rate

Karron, Jeffrey D.; Holmquist, Karsten G.; Flanagan, Rebecca J.; Mitchell, Randall J.

doi:10.1093/aob/mcp030

Cited by 101 publications

(106 citation statements)

References 42 publications

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“…Outcrossing rates vary widely within and among populations, and are inXuenced by population density (Karron et al 1995a, b), Xoral display size , Xoral morphology (Karron et al 1997), and the presence of competitors for pollination . Karron et al (2009) also documented striking variation in selWng rate among adjacent Xowers which reXects increased deposition of geitonogamous (among-Xower, within-display) self pollen as bumble bees probe consecutive Xowers on a Xoral display.…”

Section: Study Speciesmentioning

confidence: 97%

Increased relative abundance of an invasive competitor for pollination, Lythrum salicaria, reduces seed number in Mimulus ringens

2010

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When exotic plant species share pollinators with native species, competition for pollination may lower the reproductive success of natives by reducing the frequency and/or quality of visits they receive. Exotic species often become numerically dominant in plant communities, and the relative abundance of these potential competitors for pollination may be an important determinant of their effects on the pollination and reproductive success of co-occurring native species. Our study experimentally tests whether the presence and abundance of an invasive exotic, Lythrum salicaria L. (Lythraceae), influences reproductive success of a co-flowering native species, Mimulus ringens L. (Phrymaceae). We also examine the mechanisms of competition for pollination and how they may be altered by changes in competitor abundance. We found that the presence of Lythrum salicaria lowered mean seed number in Mimulus ringens fruits. This effect was most pronounced when the invasive competitor was highly abundant, decreasing the number of seeds per fruit by 40% in 2006 and 33% in 2007. Reductions in the number of seeds per fruit were likely due to reduced visit quality resulting from Mimulus pollen loss when bees foraged on neighboring Lythrum plants. This study suggests that visit quality to natives may be influenced by the presence and abundance of invasive flowering plants.

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Section: Study Speciesmentioning

confidence: 97%

Increased relative abundance of an invasive competitor for pollination, Lythrum salicaria, reduces seed number in Mimulus ringens

2010

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“…Likewise, although many studies show that insect pollination declines in fragmented populations (Aizen and Feinsinger, 1994), there are cases showing long distance pollination by small insects in fragmented landscapes (41 km; Dick et al, 2003;Byrne et al, 2008). Therefore, despite the expectation that selfing and pollen diversity should be a function of pollinator mobility, in line with the landscape ecology models (Charnov, 1976;Karron et al, 2009), more experimental studies into woody plant density, pollen movement and mating patterns are required to further understand these associations.…”

Section: Generality Of Habitat Fragmentation-mating Pattern Interactionsmentioning

confidence: 99%

“…As plant densities decline, animal pollinators are less likely to shift from one plant to another because of the increased costs of doing so-the theory of optimal foraging (Heinrich and Raven, 1972;Charnov, 1976;Ottewell et al, 2009). A pollinator foraging on a plant that is a self-compatible hermaphrodite for longer periods of time increases the probability of selfing (increases either via autogamy or geitonogamy; that is, pollination from the same or a different flower on the same plant; Karron et al, 2009). As a consequence of increased selfpollen being received, an increase in pollen discounting is expected (Barrett, 1998).…”

Section: Introductionmentioning

confidence: 99%

Mating patterns and pollinator mobility are critical traits in forest fragmentation genetics

et al. 2013

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Most woody plants are animal-pollinated, but the global problem of habitat fragmentation is changing the pollination dynamics. Consequently, the genetic diversity and fitness of the progeny of animal-pollinated woody plants sired in fragmented landscapes tend to decline due to shifts in plant-mating patterns (for example, reduced outcrossing rate, pollen diversity). However, the magnitude of this mating-pattern shift should theoretically be a function of pollinator mobility. We first test this hypothesis by exploring the mating patterns of three ecologically divergent eucalypts sampled across a habitat fragmentation gradient in southern Australia. We demonstrate increased selfing and decreased pollen diversity with increased fragmentation for two smallinsect-pollinated eucalypts, but no such relationship for the mobile-bird-pollinated eucalypt. In a meta-analysis, we then show that fragmentation generally does increase selfing rates and decrease pollen diversity, and that more mobile pollinators tended to dampen these mating-pattern shifts. Together, our findings support the premise that variation in pollinator form contributes to the diversity of mating-pattern responses to habitat fragmentation.

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“…This might increase the number of flowers pollinated during a single visit to an inflorescence. However, the tendency of pollinators to visit several flowers on a single plant increases opportunity of geitonogamy and self-pollination rate [32][33][34][35]. The repeated visits by various insects to our study plants to collect nectar and pollen suggests that they produced enough reward to the visitors which may enhance pollination.…”

Section: Discussionmentioning

confidence: 89%

Comparative reproduction mechanisms of three species of Ocimum L. (Lamiaceae)

2016

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Pollinator visitation patterns strongly influence among-flower variation in selfing rate

Cited by 101 publications

References 42 publications

Increased relative abundance of an invasive competitor for pollination, Lythrum salicaria, reduces seed number in Mimulus ringens

Increased relative abundance of an invasive competitor for pollination, Lythrum salicaria, reduces seed number in Mimulus ringens

Mating patterns and pollinator mobility are critical traits in forest fragmentation genetics

Comparative reproduction mechanisms of three species of Ocimum L. (Lamiaceae)

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