Forager Attraction by Sympatric Ipomoea hederacea and I. purpurea (Convolvulaceae) and Corresponding Forager Behavior and Energetics

Stucky, Jon M.

doi:10.2307/2443648

Cited by 15 publications

(19 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This has been a suggested function of anther-stigma clustering in a number of plant species (Webb & Lloyd, 1986), including I. hederacea (Ennos, 1981;Stucky, 1984), although there is little direct experimental evidence to support this suggestion. Our experiment provides such evidence by demonstrating that close clustering of anthers around the stigma in I. hederacea enhances prezygotic isolation from I. purpurea.…”

Section: Discussionmentioning

confidence: 99%

“…), their flowering phenologies are largely overlapping, and both species are highly attractive to the bumblebees Bombus pennsylvanicus and Bombus impatiens , their primary pollinators. Results from pollinator preference studies are mixed (Ennos, 1981;Stucky, 1984;Iwao, 1995) and show no consistent tendency for pollinators to prefer either species. Interspecific pollen transfer is thus not only quite possible in natural populations, but also likely to be costly, in particular for I. hederacea .…”

Section: Study Systemmentioning

confidence: 99%

“…Although substantial postzygotic barriers between these two species prevent the production of viable hybrids in nature, prezygotic barriers between them are weak (Ennos, 1981;Stucky, 1984;Iwao, 1995). Results from hand-pollination studies suggest that hybrid matings are likely to be costly, in particular for I. hederacea , which experiences considerable reductions in viable seed set when exposed to pollen from I. purpurea (Guries, 1978;Stucky, 1985).…”

Section: Introductionmentioning

confidence: 99%

“…Because these species, along with I. hederacea , form a clade in which I. indica is sister to I. hederacea and the other species are outgroups for this pair (Miller et al ., 2004), close clustering appears to be a derived trait in I. hederacea. It has previously been hypothesized to play a role in shielding I. hederacea from costly heterospecific pollen flow from I. purpurea (Ennos, 1981;Stucky, 1984), but until now this hypothesis has not been examined experimentally.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Close clustering of anthers and stigma in Ipomoea hederacea enhances prezygotic isolation from Ipomoea purpurea

Smith

Rausher

2006

New Phytologist

View full text Add to dashboard Cite

Summary• Theory predicts that, for taxa that are already substantially postzygotically isolated but for which hybrid mating is still costly, enhanced prezygotic isolation will be favored. Here, we tested this hypothesis by examining the potential contribution of one particular floral trait, herkogamy, to prezygotic isolation between two species of morning glory, Ipomoea hederacea and Ipomoea purpurea .• This trait was experimentally manipulated to determine whether it is a likely prezygotic isolating barrier in naturally pollinated arrays in the field.• Emasculated I. hederacea flowers set significantly fewer seeds than did control flowers, indicating that clustering of anthers and stigma in I. hederacea enhances prezygotic isolation from I. purpurea. We hypothesize that this occurs through some combination of mechanical protection and increased self-pollination, with the effect of mechanical protection estimated to be 30% greater than the effect of increased selfing.• Our results identify stigma-anther proximity as a likely prezygotic isolating barrier and target of selection in the presence of heterospecific pollen flow, and provide motivation for further study of the role of floral morphology in reproductive isolation in this system.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Study Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Close clustering of anthers and stigma in Ipomoea hederacea enhances prezygotic isolation from Ipomoea purpurea

Smith

Rausher

2006

New Phytologist

View full text Add to dashboard Cite

show abstract

“…First, we would like to characterize pollination from the point of view of a plant species, recording visitors and assessing which ones pollinate and how effectively (e.g., Motten et al 1981, Tepedino 1981a, Herrera 1987, Waser and Price 1990. We also would like to understand the pollinator's perspective, characterizing its flower choices in terms of energy and other criteria (e.g., Strickler 1979, Stucky 1984, Pleasants and Waser 1985, Duffield et al 1993). Starting with one or a few species, however, should soon lead us to a web of interactions, unless plants and pollinators are obligately related.…”

Section: Ideals To Contemplatementioning

confidence: 99%

Generalization in Pollination Systems, and Why it Matters

Waser¹,

Chittka²,

Price³

et al. 1996

Ecology

1,661

1,577

View full text Add to dashboard Cite

One view of pollination systems is that they tend toward specialization. This view is implicit in many discussions of angiosperm evolution and plant—pollinator coevolution and in the long—standing concept of pollination syndromes. But actual pollination systems often are more generalized and dynamic than these traditions might suggest. To illustrate the range of specialization and generalization in pollinators' use of plants and vice versa, we draw on studies of two floras in the United States, and of members of several plant families and solitary bee genera. We also summarize a recent study of one local flora which suggests that, although the colors of flowers are aggregated in phenotype space, there is no strong association with pollinator types as pollination syndromes would predict. That moderate to substantial generalization often occurs is not surprising on theoretical grounds. Plant generalization is predicted by a simple model as long as temporal and spatial variance in pollinator quality is appreciable, different pollinator species do not fluctuate in unison, and they are similar in their pollination effectiveness. Pollinator generalization is predicted when floral rewards are similar across plant species, travel is costly, constraints of behavior and morphology are minor, and/or pollinator lifespan is long relative to flowering of individual plant species. Recognizing that pollination systems often are generalized has important implications. In ecological predictions of plant reproductive success and population dynamics it is useful to widen the focus beyond flower visitors within the correct" pollination syndrome, and to recognize temporal and spatial fluidity of interactions. Behavioral studies of pollinator foraging choices and information—processing abilities will benefit from understanding the selective advantages of generalization. In studies of floral adaptation, microevolution, and plant speciation one should recognize that selection and gene flow vary in time and space and that the contribution of pollinators to reproductive isolation of plant species may be overstated. In conservation biology, generalized pollination systems imply resilience to linked extinctions, but also the possibility for introduced generalists to displace natives with a net loss of diversity.

show abstract

A test of the reproductive assurance hypothesis inIpomoea hederacea: does inbreeding depression counteract the benefits of self‐pollination?

Delgado-Dávila

Martén‐Rodríguez

2021

American J of Botany

View full text Add to dashboard Cite

PremiseDarwin proposed that self‐pollination in allegedly outcrossing species might act as a reproductive assurance mechanism when pollinators or mates are scarce; however, in natural populations, the benefits of selfing may be opposed by seed discounting and inbreeding depression. While empirical studies show variation among species and populations in the magnitude of reproductive assurance, little is known about the counterbalancing effects of inbreeding depression.MethodsBy comparing the female reproductive success of emasculated and open‐pollinated flowers, we assessed the reproductive assurance hypothesis in two Mexican populations of Ipomoea hederacea. In one population, we assessed temporal variation in reproductive assurance for three years. We evaluated inbreeding depression on seed production, seedling germination, and dry plant mass by contrasting self‐ and cross‐hand pollination treatments in one population for two years.ResultThe contribution of self‐pollination to female reproductive success was high and consistent between populations, but there was variation in reproductive assurance across years. Inbreeding depression was absent in the early stages of progeny development, but there was a small negative effect of inbreeding in the probability of germination and the mass of adult progeny.ConclusionsSelf‐pollination provided significant reproductive assurance in I. hederacea but this contribution was variable across time. The contribution of reproductive assurance is probably reduced by inbreeding depression in later stages of progeny development, but this counter effect was small in the study populations. This study supports the hypothesis that reproductive assurance with limited inbreeding depression is likely an important selective force in the evolution of self‐pollination in the genus Ipomoea.

show abstract

Forager Attraction by Sympatric Ipomoea hederacea and I. purpurea (Convolvulaceae) and Corresponding Forager Behavior and Energetics

Cited by 15 publications

References 0 publications

Close clustering of anthers and stigma in Ipomoea hederacea enhances prezygotic isolation from Ipomoea purpurea

Close clustering of anthers and stigma in Ipomoea hederacea enhances prezygotic isolation from Ipomoea purpurea

Generalization in Pollination Systems, and Why it Matters

A test of the reproductive assurance hypothesis inIpomoea hederacea: does inbreeding depression counteract the benefits of self‐pollination?

Contact Info

Product

Resources

About