Karyotypic evolution in Gehyra (Gekkonidae: Reptilia) IV. Chromosome change and speciation

King, Max

doi:10.1007/bf00120260

Cited by 36 publications

(34 citation statements)

References 27 publications

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“…Hypothesis 3-evaluation of chromosomal speciation patterns King (1984)hypothesized that the diversification of the Australian Gehyra was driven by chromosomal speciation and proposed a detailed evolutionary scenario by which this may have occurred. However, this scenario came under considerable scrutiny (Sites and Moritz, 1987) owing to the inconclusive nature of assumptions regarding the allopatric distribution of chromosome races and reproductive isolation between them.…”

Section: Gehyra Australis Complexmentioning

confidence: 99%

“…We test the validity of the hypothesis that Australian Gehyra result from a single, recent colonization event from a Melanesian ancestor that subsequently split into a large-bodied, tropically adapted australis species group and a small-bodied, arid-adapted variegata species group. We also test whether the King (1984) model of diversification driven by chromosomal rearrangement in allopatric populations is supported by our species tree approach.…”

Section: Introductionmentioning

confidence: 98%

“…The Australian Gehyra radiation has proven to be taxonomically troublesome in the past, as considerable genetic, karyotypic and allozyme variation does not manifest in easily recognizable morphological variation. Thus, many species comprise multiple morphological isolates, distinct chromosome races, allozymeoperational taxonomic units and mitochondrial clades (King, 1979(King, , 1982(King, , 1983(King, , 1984Moritz, 1984Moritz, , 1986Moritz, , 1992Sistrom et al, 2009;Sites and Moritz, 1987). As a relatively recent radiation (King, 1984), gene tree discordance in Gehyra is expected owing to ILS (Edwards, 2009).…”

Section: Introductionmentioning

confidence: 99%

“…King (1979King ( , 1983King ( , 1984 summarized many of these assumptions, including (1) A recent Asian origin for Gehyra (King, 1984); (2) Australian Gehyra form two major species complexes (Mitchell, 1965)-the G. variegata complex characterized by small bodied species associated with arid regions (King, 1979) and the Gehyra australis species complex characterized by larger bodied animals associated with tropical, subtropical and monsoonal regions (King, 1983); and (3) that radiation within these two complexes was due to allopatric divergence and chromosomal rearrangement with sequential radiations of allopatrically derived species from 2n ¼ 44 chromosome ancestor(s), to 2n ¼ 42 chromosome species and to 2n ¼ 40 and 2n ¼ 38 chromosome species simultaneously. However, King's proposal was criticized as premature given the incomplete taxonomy of the genus and lack of data demonstrating reproductive isolation of allopatric chromosome races (Moritz, 1992;Sites and Moritz, 1987).…”

Section: Introductionmentioning

confidence: 99%

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Evaluating evolutionary history in the face of high gene tree discordance in Australian Gehyra (Reptilia: Gekkonidae)

et al. 2014

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Species tree methods have provided improvements for estimating species relationships and the timing of diversification in recent radiations by allowing for gene tree discordance. Although gene tree discordance is often observed, most discordance is attributed to incomplete lineage sorting rather than other biological phenomena, and the causes of discordance are rarely investigated. We use species trees from multi-locus data to estimate the species relationships, evolutionary history and timing of diversification among Australian Gehyra-a group renowned for taxonomic uncertainty and showing a large degree of gene tree discordance. We find support for a recent Asian origin and two major clades: a tropically adapted clade and an arid adapted clade, with some exceptions, but no support for allopatric speciation driven by chromosomal rearrangement in the group. Bayesian concordance analysis revealed high gene tree discordance and comparisons of Robinson-Foulds distances showed that discordance between gene trees was significantly higher than that generated by topological uncertainty within each gene. Analysis of gene tree discordance and incomplete taxon sampling revealed that gene tree discordance was high whether terminal taxon or gene sampling was maximized, indicating discordance is due to biological processes, which may be important in contributing to gene tree discordance in many recently diversified organisms.

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Section: Gehyra Australis Complexmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Evaluating evolutionary history in the face of high gene tree discordance in Australian Gehyra (Reptilia: Gekkonidae)

et al. 2014

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“…The status of pericentric inversions as potential post-mating isolating mechanisms has been queried on a number of occasions, because of certain anomalies encountered in inversion heterozygotes, which override any deleterious meiotic effects (John & King 1977, 1980John 1981;King 1984King , 1987. Four separate mechanisms have been implicated in this process.…”

Section: The Modelmentioning

confidence: 99%

A dual level model for speciation by multiple pericentric inversions

King¹

1992

Heredity

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A considerable body of evidence suggests that the deleterious meiotic effects of pericentric inversions in F1 hybrids can be overcome by changes in chiasma location and various means of nonhomologous pairing. Such overriding mechanisms may render pericentric inversions benign and increase the likelihood of their fixation in population isolates. It has been argued that overriding mechanisms of this type negate the involvement of pericentric inversions as reproductive isolating mechanisms in speciation. It is suggested, however, that the involvement of pericentric inversions in speciation should be considered on two levels. First, that by reducing meiotic effects in F1 hybrids, overriding mechanisms facilitate the fixation of pericentric inversions. Secondly, when contact hybridization occurs between the chromosomally derived and parental populations second-level effects may be encountered. That is, the recombinational effects of pericentric inversion differences on coadapted gene complexes (sensu Brncic, 1954;Shaw & Coates, 1983) enforce profound inviability barriers in F2 and backcross matings. In this way, multiple pericentric inversions may act as significant post-mating isolating mechanisms, whereas individual inversions with less significant second-level effects may not.

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Isolation and propagation of neural stem cells in caprine (Capra hircus)

Agarwal

Kumar

et al. 2014

Cell Biology International

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Neural stem cells (NSCs) can self-renew and give rise to neurons, astrocytes and oligodendrocytes; they are found in the nervous system of mammalian organisms, representing a promising resource for both fundamental research and therapeutics. There have been few investigations on NSCs in the livestock species. Therefore, we have successfully isolated and characterised NSCs from the foetal brain of a small domestic animal, the goat (called GNSCs). These cells from the foetal brain showed self-renewal, rapid proliferation with a population doubling time of 88 h, were morphologically homogeneous and maintained normal chromosome throughout the culture period. The cells expressed NSC-specific markers (Sox2, Pax6 and Mushashi), but were negative for CD34 and CD45. They were capable of multi-differentiation into neurons, astrocytes, oligodendrocytes, as well as adipocytes and osteocytes. The availability of such cells may hold great interest for basic and applied neuroscience.

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Karyotypic evolution in Gehyra (Gekkonidae: Reptilia) IV. Chromosome change and speciation

Cited by 36 publications

References 27 publications

Evaluating evolutionary history in the face of high gene tree discordance in Australian Gehyra (Reptilia: Gekkonidae)

Evaluating evolutionary history in the face of high gene tree discordance in Australian Gehyra (Reptilia: Gekkonidae)

A dual level model for speciation by multiple pericentric inversions

Isolation and propagation of neural stem cells in caprine (Capra hircus)

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