Hybridization Between Yuccas From Baja California: Genomic and Environmental Patterns

Arteaga, María Clara; Bello-Bedoy, Rafael; Gasca-Pineda, Jaime

doi:10.3389/fpls.2020.00685

Cited by 15 publications

(31 citation statements)

References 62 publications

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“…The greater rate of evolutionary change in ovipositor morphology and relatively lower rate of change in tentacle morphology correspond with results from ecological studies of the importance of these traits for host use by yucca moths (Althoff, 2014, 2016; Arteaga et al, 2020; Leebens‐Mack et al, 1998). The shift in ovipositor morphology correlates with the appearance of new species of pollinator moths as well as the evolution of cheater species.…”

Section: Discussionsupporting

confidence: 76%

“…valida and Y . capensis in the Baja California Peninsula suggests that a single pollinator species can pollinate multiple species of yuccas (Arteaga et al, 2020). For the most generalist pollinator species, T. yuccasella , Althoff (2016) demonstrated that a local population of this moth has the ability to effectively pollinate a wide variety of capsular‐fruited yucca species never before encountered, but has drastically reduced success parasitizing these same species.…”

Section: Discussionmentioning

confidence: 99%

“…In terms of pollination ability, studies on hybridization in yuccas suggest that moths have the ability to effectively pollinate non-natal yucca species. Contact zones between Y. baccata and Y. schidigera in Nevada have led to hybridization of these two species, even though each has its own specialized pollinator species (Leebens-Mack et al, 1998) California Peninsula suggests that a single pollinator species can pollinate multiple species of yuccas (Arteaga et al, 2020). For the most generalist pollinator species, T. yuccasella, Althoff (2016) demonstrated that a local population of this moth has the ability to effectively pollinate a wide variety of capsular-fruited yucca species never before encountered, but has drastically reduced success parasitizing these same species.…”

Section: Discussionmentioning

confidence: 99%

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Evolution of antagonistic and mutualistic traits in the yucca‐yucca moth obligate pollination mutualism

Althoff

Segraves

2021

J of Evolutionary Biology

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Species interactions shape the evolution of traits, life histories and the pattern of speciation. What is less clear is whether certain types of species interaction are more or less likely to lead to phenotypic divergence among species. We used the brood pollination mutualism between yuccas and yucca moths to test how mutualistic (pollination) and antagonistic (oviposition) traits differ in the propensity to increase phenotypic divergence among pollinator moths. We measured traits of the tentacular mouthparts, structures used by females to actively pollinate flowers, as well as ovipositor traits to examine differences in the rate of evolution of these two suites of traits among pollinator species. Morphological analyses revealed two distinct groups of moths based on ovipositor morphology, but no such groupings were identified for tentacle morphology, even for moths that pollinated distantly related yuccas. In addition, ovipositor traits evolved at significantly faster rates than tentacular traits. These results support theoretical work suggesting that antagonism is more likely than mutualism to lead to phenotypic divergence.

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Section: Discussionsupporting

confidence: 76%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Evolution of antagonistic and mutualistic traits in the yucca‐yucca moth obligate pollination mutualism

Althoff

Segraves

2021

J of Evolutionary Biology

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“…Specifically, in the Last Interglacial (120,000 ka), the suitable habitat reached the middle of the peninsula (Arteaga et al 2020). However, in the Last Maximum Glacial (21,000 ka), the area with suitable conditions for the species suffered a substantial reduction, and it increased again in the Mid-Holocene (6000 ka), being located since that between 23-24°N (Arteaga et al 2020). The northern populations of Y. capensis would probably suffer a stronger demographic effect than southern populations, but the current genetic diversity levels detected do not reflect this because they are similar across the entire range.…”

Section: Discussionmentioning

confidence: 99%

“…Specifically, in the Last Interglacial (120,000 ka), the suitable habitat reached the middle of the peninsula (Arteaga et al . 2020). However, in the Last Maximum Glacial (21,000 ka), the area with suitable conditions for the species suffered a substantial reduction, and it increased again in the Mid‐Holocene (6000 ka), being located since that between 23–24° N (Arteaga et al .…”

Section: Discussionmentioning

confidence: 99%

High genetic diversity and low structure in an endemic long‐lived tree, Yucca capensis (Asparagaceae)

et al. 2021

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Endemic species distributed in fragmented habitats are highly vulnerable to extinction because they may have low genetic diversity. However, some life-history traits can mitigate the effect of genetic drift on populations. We analysed the level and distribution of genetic variation and ancestral population size of Yucca capensis, a long-lived endemic plant of the Baja California Peninsula, Mexico. Its populations are scattered across a habitat that is suffering accelerated transformation.• We used six nuclear microsatellites to genotype 224 individuals from 17 locations across the entire species' geographic range. We estimated polymorphisms, heterozygosity and genetic structure. We also evaluated the ancestral and recent effective size and time since the population started to change.• We found high heterozygosity, high polymorphism and low differentiation among locations, suggesting a panmictic population across the range. We also detected a large ancestral effective population size, which suffered a strong reduction in the Mid-Holocene.• Despite changes in environmental conditions caused by habitat modification, the high diversity and low differentiation in Y. capensis may result from its large ancestral effective size and life-history traits, such as plant longevity, clonal growth and mating system, which reduce the rate of loss of genetic variation. However, the dependence on a specialist pollinator that displays short flight range can reduce gene flow among the plant populations and could, shortly, lead them into an extinction vortex.

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Divergent lineages in a young species: The case of datilillo (Yucca valida), a broadly distributed plant from the Baja California Peninsula

Aleman,

Arteaga,

Gasca‐Pineda

et al. 2024

American J of Botany

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PremiseGlobally, barriers triggered by climatic changes have caused habitat fragmentation and population allopatric divergence. Across North America, oscillations during the Quaternary have played important roles in the distribution of wildlife. Notably, diverse plant species from the Baja California Peninsula in western North America, isolated during the Pleistocene glacial–interglacial cycles, exhibit strong genetic structure and highly concordant divergent lineages across their ranges. A representative plant genus of the peninsula is Yucca, with Y. valida having the widest range. Although a dominant species, it has an extensive distribution discontinuity between 26° N and 27° N, suggesting restricted gene flow. Moreover, historical distribution models indicate the absence of an area with suitable conditions for the species during the Last Interglacial, making it an interesting model for studying genetic divergence.MethodsWe assembled 4411 SNPs from 147 plants of Y. valida throughout its range to examine its phylogeography to identify the number of genetic lineages, quantify their genetic differentiation, reconstruct their demographic history and estimate the age of the species.ResultsThree allopatric lineages were identified based on the SNPs. Our analyses support that genetic drift is the driver of genetic differentiation among these lineages. We estimated an age of less than 1 million years for the common ancestor of Y. valida and its sister species.ConclusionsHabitat fragmentation caused by climatic changes, low dispersal, and an extensive geographical range gap acted as cumulative mechanisms leading to allopatric divergence in Y. valida.

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Hybridization Between Yuccas From Baja California: Genomic and Environmental Patterns

Cited by 15 publications

References 62 publications

Evolution of antagonistic and mutualistic traits in the yucca‐yucca moth obligate pollination mutualism

Evolution of antagonistic and mutualistic traits in the yucca‐yucca moth obligate pollination mutualism

High genetic diversity and low structure in an endemic long‐lived tree, Yucca capensis (Asparagaceae)

Divergent lineages in a young species: The case of datilillo (Yucca valida), a broadly distributed plant from the Baja California Peninsula

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