Genetic differentiation during speciation

Nevo, Eviatar; Clevė, Hartwig

doi:10.1038/275125a0

Cited by 108 publications

(64 citation statements)

References 17 publications

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“…DNA-DNA hybridization evidence (Catzeflis eta!., 1988) suggests that the S. ehrenbergi superspecies originated in the Early Pleistocene, around 16±03 million years ago (2n=54), and kept speciating stepwise since the Middle Pleistocene. The estimates of evolutionary divergence times of 2n = 58 and 60, according to DNA-DNA hybridization are 02±004 million years ago (Catzeflis et a!., 1988), while allozymic evidence suggests time estimates of 250,000, for the entire complex, and 70,000 years ago, for the recent speciation event generating, 2n = 60 (Nevo and Cleve, 1978). The fossil record supports these time estimates.…”

Section: Speciation Reproduction Isolation and Gene Flowsupporting

confidence: 65%

“…The hybridization results indicated that there is one /3 chain of haptoglobin gene in each of the four chromosomal species of S. ehrenbergi, as was previously shown at the protein level (Nevo and Cleve, 1978 (2) Allele a appears in high frequencies in two populations of 2n = 58 (7 and 8) and in the northernmost population of 2n=60 (10) By contrast, allele b displayed significant negative correlation with humidity: r., = -085, P < 00005. Likewise, He also displayed high significant correlation with annual humidity, r5 = 079, P <0001.…”

Section: Resultsmentioning

confidence: 75%

“…The inherited variations in humans are a consequence of the three common, autosomal alleles Hpt F Hp IS and Hp2 which code for different a chains but identical /3 chains. At the protein levels of subterranean mole rats of the Spa/ax ehrenbergi superspecies in Israel (reviewed in Nevo, 1982Nevo, , 1985Nevo, , 1986aNevo, , b, 1989, haptoglobin proved monomorphic in blood samples of 449 individuals from 24 populations of the four chromosomal species (Nevo and Cleve, 1978) across the Spa/ax range in Israel ( fig. 1).…”

Section: Introductionmentioning

confidence: 99%

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Haptoglobin DNA polymorphism in subterranean mole rats of the Spalax ehrenbergi superspecies in Israel

1989

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We analyzed the genetic diversity and environmental correlates of the haptoglobin (Hp) gene by RFLP analysis of 121 subterranean mole rats, comprising 13 populations belonging to the 4 chromosomal species (2n = 52, 54, 58 and 60) of the actively speciating Spalax ehrenbergi superspecies in Israel. The following results were indicated: (i) Out of the six restriction enzymes we tested, we found polymorphism only in Taqt, with three allelic fragments,, and described their geographic patterning. (ii) Genetic diversity of Hp was highest in the centre of the range. (iii) The two major alleles showed high significant and opposite correlation with humidity. (iv) Genetic differentiation analysis indicated that 40 per cent of the Hp variation was within, and 60 per cent between populations. We conclude that climatic selection plays an important role in haptoglobin genetic differentiation.

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Section: Speciation Reproduction Isolation and Gene Flowsupporting

confidence: 65%

Section: Resultsmentioning

confidence: 75%

Section: Introductionmentioning

confidence: 99%

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Haptoglobin DNA polymorphism in subterranean mole rats of the Spalax ehrenbergi superspecies in Israel

1989

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“…Allozymic variation has been studied in this superspecies at 30 gene loci (Nevo and Shaw, 1972;Nevo and Cleve, 1978;Nevo, Filippucci and Holmes, in preparation). These studies revealed low levels of allozyme polymorphism and heterozy- …”

Section: Introductionmentioning

confidence: 99%

Aldolase DNA polymorphism in subterranean mole-rats: genetic differentiation and environmental correlates

et al. 1990

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We analysed the genetic diversity and environmental correlates of the aldolase A and B genes by means of restriction endonucleases (DNA RFLP analysis), in the four chromosomal species (2n =52, 54, 58 and 60) of the actively speciating subterranean mole-rats of the Spalax ehrenbergi superspecies in Israel. The results indicated that: (i) both aldolase genes are highly polymorphic; (ii) Fragment frequencies and fragment profiles display geographical patterns and significant ecological correlates; (iii) discriminant analysis largely succeeded in separating the four chromosomal species on the basis of variation of aldolase RFLPs.

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“…They can be used as unambiguous, quantitative markers of the genetic distinctiveness of conspecific populations (Nei 1972;Nevo and Cleve 1978). They can thus be used to investigate the significance of zooplankton aggregations when sampling is done on appropriate spatial and temporal scales.…”

mentioning

confidence: 99%

Genetic heterogeneity in euphausiid populations: Euphausia krohnii and Nematoscelis megalops in North Atlantic Slope Water1

Bucklin

Wiebe

1986

Limnology & Oceanography

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Genetic heterogeneity of samples of Euphausia krohnii and Nematoscelis megalops collected from a 6,000‐km2 area in western North Atlantic Slope Water was investigated by electrophoretic assay of allozymic variability at eight enzyme loci. Both species exhibited significant among‐sample heterogeneity of allozyme frequencies. Genetic distances between samples were large for intraspecific comparisons (D̄ = 0.116 for E. krohnii and D̄ = 0.203 for N. megalops). This heterogeneity indicates that both species are genetically structured.

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Genetic differentiation during speciation

Cited by 108 publications

References 17 publications

Haptoglobin DNA polymorphism in subterranean mole rats of the Spalax ehrenbergi superspecies in Israel

Haptoglobin DNA polymorphism in subterranean mole rats of the Spalax ehrenbergi superspecies in Israel

Aldolase DNA polymorphism in subterranean mole-rats: genetic differentiation and environmental correlates

Genetic heterogeneity in euphausiid populations: Euphausia krohnii and Nematoscelis megalops in North Atlantic Slope Water1

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