Case studies and mathematical models of ecological speciation. 2. Palms on an oceanic island

@article{Gavrilets2007CaseSA,
  title={Case studies and mathematical models of ecological speciation. 2. Palms on an oceanic island},
  author={Sergey Gavrilets and Aaron Vose},
  journal={Molecular Ecology},
  year={2007},
  volume={16}
}
A recent study of a pair of sympatric species of palms on the Lord Howe Island is viewed as providing probably one of the most convincing examples of sympatric speciation to date. Here we describe and study a stochastic, individual‐based, explicit genetic model tailored for this palms system. Overall, our results show that relatively rapid (< 50 000 generations) colonization of a new ecological niche, and sympatric or parapatric speciation via local adaptation and divergence in flowering… 
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TLDR
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TLDR
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References

SHOWING 1-10 OF 81 REFERENCES
Case studies and mathematical models of ecological speciation. 1. Cichlids in a crater lake
TLDR
A stochastic, individual‐based, explicit genetic model tailored for this cichlid system shows that relatively rapid colonization of a new ecological niche and (sympatric or parapatric) speciation via local adaptation and divergence in habitat and mating preferences are theoretically plausible.
Sympatric speciation in palms on an oceanic island
TLDR
A large dated phylogenetic tree shows that the two species of Howea, endemic to the remote Lord Howe Island, are sister taxa and diverged from each other well after the island was formed 6.9 million years ago.
Adaptive dynamics as a mathematical tool for studying the ecology of speciation processes
TLDR
The issue of speciation appeared to be settled: according to the established dogma, biological diversification occurred in allopatry due to the accumulation of genetic differences in geographically isolated populations, but this view still prevails today, although perhaps less dominantly than before.
On the origin of species by sympatric speciation
TLDR
This work uses multilocus genetics to describe sexual reproduction in an individual-based model and considers the evolution of assortative mating, which leads to reproductive isolation between ecologically diverging subpopulations and conforms well with mounting empirical evidence for the sympatric origin of many species.
ECOLOGICAL FACTORS IN SPECIATION
TLDR
It is more important to determine the respective roles of geographical and ecological factors in speciation, and to find out whether they operate consecutively or concomitantly, than to consider the role of sympatric speciation.
The speed of ecological speciation.
TLDR
This work explores the possibility that reproductive isolation can evolve on ecological time-scales within dozens of generations, in theory and in nature, and examines few relevant studies.
Interactions among quantitative traits in the course of sympatric speciation
TLDR
The hypergeometric phenotypic model is used to show that sympatric speciation is possible even when fitness and mate choice depend on different quantitative traits, so that speciation must involve formation of covariance between these traits.
Dynamic patterns of adaptive radiation.
  • S. GavriletsA. Vose
  • Biology
    Proceedings of the National Academy of Sciences of the United States of America
  • 2005
TLDR
This work builds and explores a large-scale, stochastic, spatially explicit, individual-based model of adaptive radiation driven by adaptation to multidimensional ecological niches, and shows that a great majority of speciation events are concentrated early in the phylogeny.
How do natural and sexual selection contribute to sympatric speciation?
I use explicit genetic models to investigate the importance of natural and sexual selection during sympatric speciation and to sort out how genetic architecture influences these processes.
The evolution of reproductive isolation in closely adjacent plant populations through differential flowering time
TLDR
It is suggested that the evolution of reproductive isolation may sometimes start through a selectively neutral process, which can secondarily enhance the adaptation to divergent selection regimes in adjacent plant populations.
...
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