Selfing ability and drift load evolve with range expansion

Koski, Matthew H.; Layman, Nathan C.; Prior, Carly J.; Busch, Jeremiah W.; Galloway, Laura F.

doi:10.1002/evl3.136

Cited by 42 publications

(68 citation statements)

References 95 publications

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“…In this study we focus on 24 populations west of the Appalachian Mountains which form a clade that is divergent from populations in the Appalachians, as well as those east of the Appalachians (Barnard-Kubow et al, 2015). Population genomic analyses support an origin for this Western clade in the Appalachian Plateau of Southwestern Kentucky (Koski et al, 2019). This location served as the most-likely region of glacial refugia during the Pleistocene glaciation with stepwise colonization westward and northward following glacial recession.…”

Section: Systemmentioning

confidence: 99%

“…Thus, populations are genetically-structured with increasing distance from the refugium (Koski et al, 2019;Prior et al in review). We used the linear geographic distance from the refugium as a proxy of population structure established through post-glacial migration (Koski et al, 2019).…”

Section: Predictors Of Color Variation: Climatic Data Pollinator Datmentioning

confidence: 99%

“…The distance from the glacial refugium had the strongest effect on pollinator-perceived petal color, but there was also a modest and near-significant influence of small bee visitation rate. Historical migration of C. americana from the southern Appalachian plateau following glacial recession has resulted in genetic clusters of populations east and west of the Mississippi River (Koski et al, 2019;Prior et al in revision). Geographic differences in flower color among populations are consistent with a Mississippi River split (Figure 3).…”

Section: Historical Colonization Not Pollinators As a Driver Of Petmentioning

confidence: 99%

“…We posit that alterations to petal color in C. americana are likely achieved through genetic modification to regulatory or structural anthocyanin biosynthetic pathway genes, resulting in a change in the ratios of colored anthocyanin compounds (i.e., copigmentation; Asen et al, 1972). While the pigment biochemistry of petals is not known, variation in pollen color in C. americana is driven largely by changes in concentrations of the anthocyanins cyanidin and peonidin (Koski et al, 2019). Populations east of the Mississippi River had petals closer to the "blue-green" sector of color space while those west of the Mississippi River had petals near the center of the "blue" sector of color space (Figure 1).…”

Section: Historical Colonization Not Pollinators As a Driver Of Petmentioning

confidence: 99%

“…During range expansion, small founder populations that establish beyond a range edge are most likely derived from range-edge populations (Hallatschek and Nelson, 2008). Serial genetic bottlenecks experienced through founder events should establish geographic population structure with genetic diversity declining with increasing distance from glacial refugia (e.g., Willi et al, 2018;Koski et al, 2019). Floral color could show spatial patterns consistent with neutral evolution along expansion routes.…”

Section: Introductionmentioning

confidence: 99%

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Geographic Variation in Floral Color and Reflectance Correlates With Temperature and Colonization History

Koski

Galloway

2020

Front. Plant Sci.

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Petal color variation within species is common and may be molded by abiotic or biotic selection pressures, or neutral population structure. For example, darker flowers may be favored in cooler environments because they absorb more solar radiation, elevating the temperature of reproductive structures. Additionally, flower color may evolve to attract the dominant or most efficient pollinator type in a given population. Here, we evaluate geographic variation in petal coloration across the range of Campanula americana in Eastern North America and test whether color covaries with abiotic factors, the pollination community, and genetic structure established through post-glacial expansion. Consistent with other studies, flowers from cooler, higher latitude populations were less reflective across the UV-NIR spectrum than those from warmer populations. Local temperature explained variation in petal reflectance better than the pollinator community or colonization history. Petal color perceived by trichromatic bee pollinators displayed a strong longitudinal pattern but was unassociated with climatic factors and the pollinator community. Instead, pollinator-perceived color was tightly correlated with the geographic distance from C. americana's glacial refugium. In total, abiotic conditions appear to shape large-scale geographic variation in the intensity of petal reflectance while genetic structure is the strongest driver of pollinator-perceived petal coloration. This study highlights the importance of abiotic factors and historical processes associated with range expansion as major evolutionary forces shaping diversity of flower coloration on large geographic scales.

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Section: Systemmentioning

confidence: 99%

Section: Predictors Of Color Variation: Climatic Data Pollinator Datmentioning

confidence: 99%

Section: Historical Colonization Not Pollinators As a Driver Of Petmentioning

confidence: 99%

Section: Historical Colonization Not Pollinators As a Driver Of Petmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Geographic Variation in Floral Color and Reflectance Correlates With Temperature and Colonization History

Koski

Galloway

2020

Front. Plant Sci.

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Molecular phylogeography and historical demography of a widespread herbaceous species from eastern North America, Podophyllum peltatum

Wang,

Yap,

Wan

et al. 2023

American J of Botany

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PremiseGlacial/interglacial cycles and topographic complexity are both considered to have shaped today's diverse phylogeographic patterns of taxa from unglaciated eastern North America (ENA). However, few studies have focused on the phylogeography and population dynamics of wide‐ranging ENA herbaceous species occurring in forest understory habitat. We examined the phylogeographic pattern and evolutionary history of Podophyllum peltatum L., a widely distributed herb inhabiting deciduous forests of ENA.MethodsUsing chloroplast DNA (cpDNA) sequences and nuclear microsatellite loci, we investigated the population structure and genetic diversity of the species. Molecular dating, demographic history analyses, and ecological niche modeling were also performed to illustrate the phylogeographic patterns.ResultsOur cpDNA results identified three main groups that are largely congruent with boundaries along the Appalachian Mountains and the Mississippi River, two major geographic barriers in ENA. Populations located to the east of the Appalachians and along the central Appalachians exhibited relatively higher levels of genetic diversity. Extant lineages may have diverged during the late Miocene, and range expansions of different groups may have happened during the Pleistocene glacial/interglacial cycles.ConclusionsOur findings indicate that geographic barriers may have started to facilitate the population divergence in P. peltatum before the Pleistocene. Persistence in multiple refugia, including areas around the central Appalachians during the Quaternary glacial period, and subsequent expansions under hospitable climatic condition, especially westward expansion, are likely responsible for the species’ contemporary genetic structure and phylogeographic pattern.

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Support for Baker's law: Facultative self‐fertilization ability decreases pollen limitation in experimental colonization

Makowski,

Lamb,

Galloway

2024

American J of Botany

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PremiseThe ability to self‐fertilize is predicted to provide an advantage in colonization because a single individual can reproduce and establish a next generation in a new location regardless of the density of mates. While there is theoretical and correlative support for this idea, the strength of mate limitation as a selective agent has not yet been delineated from other factors that can also select for self‐fertilization in colonization of new habitats. We used known mating‐system variation in the American bellflower (Campanula americana) to explore how plants’ ability to self‐fertilize can mitigate density‐dependent reproduction and impact colonization success.MethodsWe created experimental populations of single individuals or a small number of plants to emulate isolated colonization events. These populations were composed of plants that differed in their ability to self‐fertilize. We compared pollen limitation of the single individuals to that of small populations.ResultsExperimental populations of plants that readily self‐fertilize produced consistent seed numbers regardless of population size, whereas plants with lower ability to self‐fertilize had density‐dependent reproduction with greater seed production in small populations than in populations composed of a single individual.ConclusionsWe experimentally isolated the effect of mate limitation in colonization and found that it can select for increased self‐fertilization. We show the benefit of self‐fertilization in colonization, which helps to explain geographic patterns of self‐fertilization and shows support for Baker's law, a long‐held hypothesis in the field of mating‐system evolution.

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Selfing ability and drift load evolve with range expansion

Cited by 42 publications

References 95 publications

Geographic Variation in Floral Color and Reflectance Correlates With Temperature and Colonization History

Geographic Variation in Floral Color and Reflectance Correlates With Temperature and Colonization History

Molecular phylogeography and historical demography of a widespread herbaceous species from eastern North America, Podophyllum peltatum

Support for Baker's law: Facultative self‐fertilization ability decreases pollen limitation in experimental colonization

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