Limited hybridization across an edaphic disjunction between the gabbro-endemic shrub Ceanothus roderickii (Rhamnaceae) and the soil-generalist Ceanothus cuneatus.

@article{Burge2013LimitedHA,
  title={Limited hybridization across an edaphic disjunction between the gabbro-endemic shrub Ceanothus roderickii (Rhamnaceae) and the soil-generalist Ceanothus cuneatus.},
  author={Dylan Burge and Robin Hopkins and Yi-Hsin Erica Tsai and Paul S Manos},
  journal={American journal of botany},
  year={2013},
  volume={100 9},
  pages={
          1883-95
        }
}
UNLABELLED PREMISE OF THE STUDY Hybridization is thought to have played an important role in diversification of the speciose shrub genus Ceanothus; putative hybrid species have been described, and data suggest that intrinsic barriers may not exist among closely related species. However, the extent to which hybridization occurs in the wild is not known, and little is understood about how extrinsic factors such as soil chemistry may influence the process. The present research focuses on the… 

Figures and Tables from this paper

Species cohesion of an extremophyte (Carex angustisquama, Cyperaceae) in solfatara fields maintained under interspecific natural hybridization.
TLDR
The results of Bayesian clustering and simulation analyses revealed that all individuals of the three hybrid species were classified into the first hybrid generation or first backcross to C. angustisquama; therefore, current interspecific gene flow is limited.
Three Edaphic-Endemic Ceanothus (Rhamnaceae) New to Science
TLDR
Three new taxa of Ceanothus are described, two initially noted among existing collections, and another discovered during botanical exploration in San Diego County, which are edaphic micro-endemics found only in the southern California Floristic Province, California.
The Role of Soil Chemistry in the Geographic Distribution of Ceanothus otayensis (Rhamnaceae)
Abstract Ceanothus otayensis McMinn (Rhamnaceae) was previously known only from metavolcanic-derived soils of the northern Peninsular Ranges—predominantly the San Ysidro Mountains—in San Diego
The contribution of hybridization to range-wide population genetic structure in a Pacific coastal dune plant.
TLDR
The lack of genetic differentiation between LF-SI C. cheiranthifolia and C. bistorta populations, even those located away from the zone of parapatry, suggests that, instead of hybridizing with C. gaelicola proper, LF- SI is rather an ecotype of C. hollandica that has adapted to coastal dune habitat independent of other lineages in C.CheiranthIFolia proper.
A Newly Described Serpentine-Endemic Ceanothus (Rhamnaceae) From Coastal Marin County, California
TLDR
Ceanothus decornutus differs in a number of ways from C. jepsonii and suggests relationships to other northern San Francisco Bay species.
Lessons on Evolution from the Study of Edaphic Specialization
TLDR
Both reduced competitiveness and greater susceptibility to herbivory have been documented among some edaphic specialists when grown in ‘normal’ soils, suggesting that a high physiological cost of tolerance may result in strong divergent selection across soil boundaries.
Origins of Plant Diversity in the California Floristic Province
TLDR
Molecular phylogenetic studies spanning the flora indicate that immediate sources of CA-FP lineages bearing endemic species diversity have been mostly within North America—especially within the west and southwest—even for groups of north temperate affinity.
Reproductive isolation between populations of Iris atropurpurea is associated with ecological differentiation.
TLDR
The results indicate that the rise of post-pollination reproductive barriers in I. atropurpurea is more affected by ecological differentiation between populations than by geographical distance, supporting the hypothesis that ecological differentiation is predominant over isolation by distance and by reduced gene flow in this species.
Evolution of leaf structure and drought tolerance in species of Californian Ceanothus.
TLDR
Leaf traits and drought tolerance evolved within and across lineages of Ceanothus consistently with climatic distributions, and the πTLP has signal to indicate the evolution of drought tolerance within small clades.
Influence of a climatic gradient on genetic exchange between two oak species.
TLDR
The hypothesis that a strong climatic gradient can promote genetic exchange between species is supported and the overall weak correlation between genotype and phenotype in the contact zone between the species suggests that genetic exchange can lead to the breakdown of trait combinations used to define species.
...
1
2
...

References

SHOWING 1-10 OF 70 REFERENCES
Edaphic Ecology and Genetics of the Gabbro-Endemic Shrub Ceanothus roderickii (Rhamnaceae)
TLDR
Analysis of data indicates that evolution of C. roderickii was associated with specialization to nutrient-deficient forms of gabbro-derived soil, a result that is consistent with reinforcement.
Factors affecting the co-existence of the serpentine endemic Mimulus nudatus Curran and its presumed progenitor, Mimulus guttatus Fischer ex DC
TLDR
This work investigated whether there was any reduction in fertility of M. nudatus and M. guttatus caused by interspecific crosses when growing in sympatry and found that the two species may need to be sufficiently ec different to co-exist in sympathy.
Morphological and Molecular Analysis of Putative Hybrid Speciation in Ceanothus (Rhamnaceae)
TLDR
All four entities in the North American shrub genus Ceanothus are found to be closely related genetically, with the alternative hypothesis of primary allopatric divergence just as reasonable an explanation for the data.
Genetic diversity and structure of the narrow endemic Wyethia reticulata and its congener W. bolanderi (Asteraceae) using RAPD and allozyme techniques.
TLDR
Limited gene flow, drift within small populations, and sexual reproductive dominance of large clones result in the genetic divergence of populations in this species, while genetic diversity is maintained by the longevity of clones and outbreeding.
ORIGIN OF THE SERPENTINE‐ENDEMIC HERB LAYLA DISCOIDEA FROM THE WIDESPREAD L. LANDULOSA (COMPOSITAE)
  • B. G. Baldwin
  • Biology
    Evolution; international journal of organic evolution
  • 2005
TLDR
Nuclear rDNA sequences uphold Gottlieb et al.'s hypothesis that Layia discoidea, a morphologically unusual, serpentine‐endemic herb of narrow distribution in central California, “budded off” recently from a nearby lineage of the widespread L. glandulosa, which occurs on sandy soils across much of far western North America.
Trends in the evolution of edaphic specialists with an example of parallel evolution in the Lasthenia californica complex
TLDR
These findings point to the development of parallel changes in reproductive compatibility accompanying parallel evolution of edaphic races in the L. californica complex, one of the better documented cases of parallel adaptation in plants.
The Edaphic Factor in the Origin of Plant Species
TLDR
This paper discusses several key studies that have appeared in the literature in the last half century emphasizing the role unusual soil conditions—such as those found on serpentinite outcrops, mine tailings, guano deposits, and salt flats—can play in the diversification of plant species.
Comparative Population Genetic Structure of the Rare Woodland Shrub Daviesia suaveolens and Its Common Congener D. mimosoides
TLDR
It is confirmed that not all types of rarity have the same genetic implications and that D. suaveolens need not be concerned about low population-level variation unless populations become significantly smaller than is currently typical.
Gene flow and differential mortality in a contact zone between two Albinaria species (Gastropoda; Clausiliidae)
TLDR
The maladaptation and disadvantage of these specimens revealed the possible action of a postzygotic isolation mechanism between these two morphologically, molecularly and electrophoretically distinct species, that can, however, mate under laboratory conditions.
...
1
2
3
4
5
...