The Atlas mountains as a biogeographical divide in North–West Africa: evidence from mtDNA evolution in the Agamid lizard Agama impalearis

Brown, Richard P.; Suárez, Nicolás M.; Pestano, J.

doi:10.1016/s1055-7903(02)00218-x

Cited by 68 publications

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“…On the other hand, the lack of shared haplotypes between the northern and southern Moroccan populations was a particularly unexpected result and indicates that the Middle and High Atlas mountains, as well as the highlands in between, represent an effective geographic barrier to this species. The Atlas mountains play a similar isolating role in other organisms such as lizards (Brown et al, 2002;Harris et al, 2002) and freshwater turtles (Fritz et al, 2005). Alternatively, the differences between southern and northern Moroccan populations may indicate that these colonies were founded by individuals coming from different refugia.…”

Section: Discussionmentioning

confidence: 99%

Mitochondrial DNA signatures at different spatial scales: from the effects of the Straits of Gibraltar to population structure in the meridional serotine bat (Eptesicus isabellinus)

et al. 2009

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Section: Discussionmentioning

confidence: 99%

Mitochondrial DNA signatures at different spatial scales: from the effects of the Straits of Gibraltar to population structure in the meridional serotine bat (Eptesicus isabellinus)

et al. 2009

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“…For instance, a number of studies have shown the impact of the rise of the Andes Cordillera on the dispersal of individuals of the same or different species, by assessing the genetic structure of populations on both sides of the Andes and/or by describing their restricted distributions due to the barrier (Mones, 1991;Brumfield & Capparella, 1996;Arrivillaga, Norris, Feliciangeli, & Lanzaro, 2002;Romero, 2003;Bernal, Guarnizoi, & Luddecke, 2005;Albert, Lovejoy, & Crampton, 2006;Brumfield & Edwards, 2006;Weir & Price, 2011). The effect of orogeny has also been tested elsewhere, in regions such as the Northwest Africa Atlas Mountains (Brown, Suárez, & Pestano, 2002); the Central Mountain Range in Taiwan (Lee, Jiang, Su, & Tso, 2004); the mountains of Eastern Australia (Smissen, Melville, Sumner, & Jessop, 2013); the Pyrenees and the Cantabrian Mountains in Spain (Milá, Surget-Groba, Heulin, Gosá, & Fitze, 2013).The Riverine hypothesis suggests that ancestral populations have been divided in isolated sub-populations as a result of the appearance of a river or a change in its course (Haffer, 1997). The effect of rivers on the genetic structure of populations or the geographic distribution of taxa has been demonstrated in a variety of vertebrates: amphibians (García-París, Alcobendas, & Alberch, 1998); mammals (Wallace, 1852;da Silva & Patton, 1998;Eizirik et al, 1998;Patton, da Silva, & Malcolm, 2000; Brant & Orti, 2003;Eriksson, Hohmann, Boesch, & Vigilant, 2004); and reptiles (Lamborot & Eaton, 1997;Burbrink, Lawson, & Slowinski, 2000;Brown et al, 2002;Pellegrino et al, 2005;Mulcahy, Spaulding, Mendelson, & Brodie, Jr., 2006;Brandley, Guiher, Pyron, Winne, & Burbrink, 2010).…”

mentioning

confidence: 99%

“…The effect of orogeny has also been tested elsewhere, in regions such as the Northwest Africa Atlas Mountains (Brown, Suárez, & Pestano, 2002); the Central Mountain Range in Taiwan (Lee, Jiang, Su, & Tso, 2004); the mountains of Eastern Australia (Smissen, Melville, Sumner, & Jessop, 2013); the Pyrenees and the Cantabrian Mountains in Spain (Milá, Surget-Groba, Heulin, Gosá, & Fitze, 2013).…”

mentioning

confidence: 99%

mentioning

confidence: 99%

“…The effect of rivers on the genetic structure of populations or the geographic distribution of taxa has been demonstrated in a variety of vertebrates: amphibians (García-París, Alcobendas, & Alberch, 1998); mammals (Wallace, 1852;da Silva & Patton, 1998;Eizirik et al, 1998;Patton, da Silva, & Malcolm, 2000; Brant & Orti, 2003;Eriksson, Hohmann, Boesch, & Vigilant, 2004); and reptiles (Lamborot & Eaton, 1997;Burbrink, Lawson, & Slowinski, 2000;Brown et al, 2002;Pellegrino et al, 2005;Mulcahy, Spaulding, Mendelson, & Brodie, Jr., 2006;Brandley, Guiher, Pyron, Winne, & Burbrink, 2010). Specifically, rivers in the Amazon basin have been shown to be barriers for the dispersal of a number of organisms in the region (Wallace, 1852;da Silva & Patton, 1998;Eizirik et al, 1998;Patton et al, 2000).…”

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confidence: 99%

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Genetic structure of Tupinambis teguixin (Squamata: Teiidae), with emphasis on Venezuelan populations.

Ripoll

Herrera

Arrivillaga

2015

RBT

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Tupinambis teguixin, the common tegu, is the only species of the genus found in Venezuela. It is distributed in different bioregions in the Neotropics, some of them separated by geographic barriers that may restrict gene flow among populations. Thus, to assess this possibility, we tested the Paleogeographic hypothesis and the Riverine hypothesis for the divergence among populations. To this end, we evaluated the degree of genetic structuring in six populations of T. teguixin from Venezuela, plus one from Brazil and one from Ecuador. We used two molecular datasets, one with the populations from Venezuela (Venezuela dataset, 1 023 bp) and one including the other two (South America dataset, 665 bp), with 93 and 102 concatenated sequences from cytochrome b and ND4, and 38/37 haplotypes. We used three measures of genetic diversity: nucleotide diversity, haplotype diversity and number of polymorphic sites. Gene flow was estimated with the statistic Φ ST and paired F ST values. We also constructed a haplotype network. We found genetic structuring with (1) Φ ST = 0.83; (2) high paired F ST estimates (0.54 -0.94); (3) haplotype networks with a well-defined geographic pattern; and (4) a single shared haplotype. The genetic structure does not seem to stem from geographic distance (r = 0.282, p = 0.209), but rather the product of an historic biogeographic event with the Mérida Andes and the Orinoco River (71.2 % of the molecular variance) as barriers. We propose the Zulia population as an Evolutionary Significant Unit and that the other populations be temporarily considered Management Units, pending further data. Populations Delta and Guri should form a single Management Unit since they share a haplotype. Rev. Biol. Trop. 63 (4): 1235-1249. Epub 2015 December 01.Key words: geographic barriers, mitochondrial DNA, population genetics, population structure, Tupinambis teguixin, Venezuela.The South American subcontinent harbors the greatest biological diversity on Earth and its origin is usually attributed to historical factors involving vicariant mechanisms or allopatric speciation. The main hypotheses are: the Refuge hypothesis, the Gradient hypothesis, the Disturbance-vicariance hypothesis, the Paleogeography hypothesis, and the River or Riverine hypothesis (Haffer, 1997;Moritz, Patton, Schneider, & Smith, 2000), with the latter two being the most frequently tested. The Paleogeography hypothesis considers changes in the relative distribution of land, sea or landscape as a result of tectonic movements (e.g., mountains rising) or sea level fluctuations as major factors in the distribution of species in the Neotropics (Haffer, 1997). For instance, a number of studies have shown the impact of the rise of the Andes Cordillera on the dispersal of individuals of the same or different species, by assessing the genetic structure of populations on both sides of the Andes and/or by describing their restricted distributions due to the barrier (Mones, 1991;Brumfield & Capparella, 1996;Arrivillaga, Norris, Feliciangeli, & Lanzar...

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Species delimitation and digit number in a North African skink

Brown¹,

Tejangkura²,

Mouden

et al. 2012

Ecology and Evolution

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Delimitation of species is an important and controversial area within evolutionary biology. Many species boundaries have been defined using morphological data. New genetic approaches now offer more objective evaluation and assessment of the reliability of morphological variation as an indicator that speciation has occurred. We examined geographic variation in morphology of the continuously distributed skink Chalcides mionecton from Morocco and used Bayesian analyses of nuclear and mitochondrial DNA (mtDNA) loci to examine: (i) their concordance with morphological patterns, (ii) support for species delimitation, (iii) timing of speciation, and (iv) levels of gene flow between species. Four digit individuals were found at sites between Cap Rhir (in the south) and the northern extreme of the range, whereas five-digit individuals were found in two disjunct areas: (i) south of Cap Rhir and (ii) the north of the range where they were often syntopic with four-digit individuals. The pattern of variation in generalized body dimensions was largely concordant with that in digit number, suggesting two general morphotypes. Bayesian analyses of population structure showed that individuals from sites south of Cap Rhir formed one genetic cluster, but that northern four- and five-digit individuals clustered together. Statistical support for delimitation of these genetic clusters into two species was provided by a recent Bayesian method. Phylogenetic–coalescent dating with external time calibrations indicates that speciation was relatively recent, with a 95% posterior interval of 0.46–2.66 mya. This postdates equivalent phylogenetic dating estimates of sequence divergence by approximately 1 Ma. Statistical analyses of a small number of independent loci provide important insights into the history of the speciation process in C. mionecton and support delimitation of populations into two species with distributions that are spatially discordant with patterns of morphological variation.

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The Atlas mountains as a biogeographical divide in North–West Africa: evidence from mtDNA evolution in the Agamid lizard Agama impalearis

Cited by 68 publications

References 37 publications

Mitochondrial DNA signatures at different spatial scales: from the effects of the Straits of Gibraltar to population structure in the meridional serotine bat (Eptesicus isabellinus)

Mitochondrial DNA signatures at different spatial scales: from the effects of the Straits of Gibraltar to population structure in the meridional serotine bat (Eptesicus isabellinus)

Genetic structure of Tupinambis teguixin (Squamata: Teiidae), with emphasis on Venezuelan populations.

Species delimitation and digit number in a North African skink

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