Sex Among the Flowers: The Distribution of Plant Mating Systems

Vogler, Donna W.; Kalisz, Susan

doi:10.1554/0014-3820(2001)055[0202:satftd]2.0.co;2

Cited by 104 publications

(127 citation statements)

References 22 publications

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“…Much of the discussion concerning the frequency of mixed mating in nature has focused on animal-pollinated species (Aide 1986;Vogler and Kalisz 2001). We plotted the distribution of outcrossing rates among animal-pollinated species (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Accounting for these missing taxa could alter our view of both the relative frequency of mixed mating and the shape of the distribution of outcrossing rates. For instance, Vogler and Kalisz (2001) used data from Barrett and Eckert (1990) to surmise that 33% of all taxa have intermediate outcrossing rates (rates between 0.2 and 0.8) and that among animalpollinated taxa, this fraction increased to 49% (see also Kalisz et al 2004). In our dataset of published outcrossing rates, these values remain similar, 35% and 42%, respectively (Figs.…”

Section: Discussionmentioning

confidence: 99%

“…For animal-pollinated species, the fit of the distribution of outcrossing rates to bimodal expectations of Lande and Schemske (1985) has also been challenged (Vogler and Kalisz 2001;Barrett 2003). Although we are not aware of any statistically rigorous tests of bimodality, data for animalpollinated species (Figs.…”

Section: Discussionmentioning

confidence: 99%

“…Aide (1986) pointed out that Schemske and Lande's (1985) original data showed strong bimodality in wind but not animal-pollinated species. That point was expounded more recently by Vogler and Kalisz (2001). They found that 49% of animal-pollinated species had outcrossing rates between 0.2 and 0.8.…”

mentioning

confidence: 96%

“…These papers instigated a wave of critical assessment, both on theoretical (e.g., Uyenoyama 1986, Waller 1986, Holsinger 1988, 1991Porcher and Lande 2005) and empirical grounds (Aide 1986; Barrett and Eckert 1990;Vogler and Kalisz 2001; for reviews, see Barrett 2003 andGoodwillie et al 2005). Several theoretical models found conditions under which mixed mating is optimal.…”

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confidence: 99%

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The Distribution of Plant Mating Systems: Study Bias Against Obligately Outcrossing Species

2006

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Early models of plant mating-system evolution argued that predominant outcrossing and selfing are alternative stable states. At least for animal-pollinated species, recent summaries of empirical studies have suggested the opposite-that outcrossing rates do not show the expected bimodal distribution. However, it is generally accepted that several potential biases can affect conclusions from surveys of published outcrossing rates. Here, we examine one potential bias and find that published studies of outcrossing rates contain far fewer obligate outcrossers than expected. We approximate the magnitude of this study bias and present the distribution of outcrossing rates after compensating for it. Because this study examines only one potential bias, and finds it to be large, conclusions regarding either the frequency of mixed mating or the shape of the distribution of outcrossing rates in nature are premature.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 96%

mentioning

confidence: 99%

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The Distribution of Plant Mating Systems: Study Bias Against Obligately Outcrossing Species

2006

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Pollen limitation and autonomous selfing ability interact to shape variation in outcrossing rate across a species range

Koski

Galloway

Busch

2019

American J of Botany

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Hermaphroditic plants commonly reproduce through a mixture of selfing and outcrossing. The degree to which outcrossing rates reflect the availability of outcross pollen, genetic differentiation in the ability to autonomously self-fertilize, or both is often unclear. Despite the potential for autonomy and the pollination environment to jointly influence outcrossing, this interaction is rarely studied. METHODS: We reviewed studies from the literature that tested whether the pollination environment or floral traits that cause autonomous selfing predict variation in outcrossing rate among populations. We also measured outcrossing rates in 23 populations of Campanula americana and examined associations with the pollination environment, autonomy, and their interaction. RESULTS: Our review revealed that traits that facilitate selfing were often negatively associated with outcrossing rates whereas most aspects of the pollination environment poorly predicted outcrossing. Populations of C. americana varied from mixed mating to highly outcrossing, but variation was unrelated to population size, density, pollen limitation, or autonomous selfing ability. Outcrossing rate was significantly influenced by an interaction between autonomous selfing ability and pollen limitation. Across highly autonomous populations, elevated pollen limitation was associated with reduced outcrossing, while there was no relationship for less autonomous populations. CONCLUSIONS: Both the ability to self autonomously and pollen limitation interact to shape outcrossing rates in C. americana. This work suggests that autonomy affords mating-system flexibility, though it is not ubiquitous in all populations across the species range. Interactions between traits influencing autonomy and pollen limitation are likely to explain variation in outcrossing rates among populations of flowering plants.

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Selfing rate variation within species is unrelated to life‐history traits or geographic range position

Prior

Busch

2021

American J of Botany

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Premise In plants, populations and species vary widely along the continuum from outcrossing to selfing. Life‐history traits and ecological circumstances influence among‐species variation in selfing rates, but their general role in explaining intraspecific variation is unknown. Using a database of plant species, we test whether life‐history traits, geographic range position, or abundance predict selfing rate variation among populations. Methods We identified species where selfing rates were estimated in at least three populations at known locations. Two key life‐history traits (generation time and growth form) were used to predict within‐species selfing rate variation. Populations sampled within a species’ native range were assessed for proximity to the nearest edge and abundance. Finally, we conducted linear and segmented regressions to determine functional relationships between selfing rate and geographic range position within species. Results Selfing rates for woody species varied less than for herbs, which is explained by the lower average selfing rate of woody species. Relationships between selfing and peripherality or abundance significantly varied among species in their direction and magnitude. However, there was no general pattern of increased selfing toward range edges. A power analysis shows that tests of this hypothesis require studying many (i.e., 40+) populations. Conclusions Intraspecific variation in plant mating systems is often substantial yet remains difficult to explain. Beyond sampling more populations, future tests of biogeographic hypotheses will benefit from phylogeographic information concerning specific range edges, the study of traits influencing mating system (e.g., herkogamy), and measures of abundance at local scales (e.g., population density).

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Sex Among the Flowers: The Distribution of Plant Mating Systems

Cited by 104 publications

References 22 publications

The Distribution of Plant Mating Systems: Study Bias Against Obligately Outcrossing Species

The Distribution of Plant Mating Systems: Study Bias Against Obligately Outcrossing Species

Pollen limitation and autonomous selfing ability interact to shape variation in outcrossing rate across a species range

Selfing rate variation within species is unrelated to life‐history traits or geographic range position

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