Offset across the Polochic fault of Guatemala and Chiapas, Mexico

Burkart, Burke

doi:10.1130/0091-7613(1978)6<328:oatpfo>2.0.co;2

Cited by 72 publications

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“…2), demonstrating that Sierra Madre de Chiapas is an effective geographical barrier that has prevented gene flow between them. The mountain range called Sierra Madre de Chiapas arose about the middle Mioceneearly Pliocene (Burkart, 1978;Aguayo and Trápaga, 1996), probably before the Jatropha colonization of Chiapas (after the closure of the Isthmus of Panama, about three million years ago; Carels, 2009;OvandoMedina et al, 2013), possibly indicating two routes of Jatropha dispersion: throughout the coastal zone and to the North of the mountain. Furthermore, differentiation was not due to isolation by distance (Mantel P ¼ 0.137), but probably due to allopatry.…”

Section: Discussionmentioning

confidence: 99%

Genetic diversity and structure ofJatropha curcasL. in its centre of origin

Salvador-Figueroa

Magaña-Ramos

Vázquez-Ovando

et al. 2014

Plant Genet. Resour.

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To investigate the genetic diversity and structure of Jatropha curcas L. oilseed plant, in this study, native populations from Chiapas, Mexico, were evaluated, using microsatellite DNA markers. A total of 93 representative samples were selected from seven sites in two regions in the state of Chiapas grouped by geographical proximity, where leaf samples were collected to isolate the genomic DNA. Individual polymerase chain reactions were carried out with ten pairs of specific oligonucleotides for the microsatellites of J. curcas, separating the products of amplification by acrylamide electrophoresis. Twenty-seven fragments were detected (77% polymorphic) with which heterozygous individuals were distinguished. The most informative microsatellite was Jcps20 (nine alleles, polymorphic index content 0.354). The average polymorphism per population was 58%. The Hardy -Weinberg tests revealed a reproductive pattern of non-random mating. The diversity descriptors and the analysis of molecular variance revealed that the populations were structured and moderately differentiated (F ST 0.087) and that this differentiation was not due to isolation by distance, as the Mantel test was not significant (P ¼ 0.137), but rather due to allopatry. Bayesian analysis revealed that the accessions belonged to only four genetic groups and confirmed the differentiation between the regions. Because some loci were in Hardy -Weinberg disequilibrium, it is proposed that differentiation is due to the clonal reproduction of J. curcas practised by farmers in Chiapas, along with the anthropogenic dispersion at regional levels. The results of this study reveal that J. curcas in Chiapas has genetic diversity that is greater than that reported in other parts of the world, which represents a potential germplasm pool for the selection of genotypes.

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Section: Discussionmentioning

confidence: 99%

Genetic diversity and structure ofJatropha curcasL. in its centre of origin

Salvador-Figueroa

Magaña-Ramos

Vázquez-Ovando

et al. 2014

Plant Genet. Resour.

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“…The Sierra Madre mountain chain arose probably from the medium Miocene to the early Pliocene (between 13 and 4.5 million years ago (m.y.a.)) [74,75], while J. curcas probably exists from more than 70 m.y.a. [76].…”

Section: Structure Of Populationsmentioning

confidence: 99%

Genetic Diversity in Jatropha curcas Populations in the State of Chiapas, Mexico

et al. 2011

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Jatropha curcas L. has become an important source of oil production for biodiesel fuel. Most genetic studies of this plant have been conducted with Asian and African accessions, where low diversity was encountered. There are no studies of this kind focusing in the postulated region of origin. Therefore, five populations of J. curcas were studied in the state of Chiapas, Mexico, using amplified fragment length polymorphism (AFLP) markers. One hundred and fifty-two useful markers were obtained: overall polymorphism = 81.18% and overall Nei's genetic diversity (He) = 0.192. The most diverse population was the Border population [He: 0.245, Shanon's information index (I): 0.378]. A cluster analysis revealed the highest dissimilarity coefficient (0.893) yet to be reported among accessions. An analysis of molecular variance (AMOVA) revealed that the greatest variation is within populations (87.8%), followed by the variation among populations (7.88%). The PhiST value (0.121) indicated moderate differentiation between populations. However, a spatial AMOVA (SAMOVA) detected a stronger genetic structure

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“…These faults are seismically active ( Fig. 3a; White, 1984;Singh et al, 1984;Ambraseys and Adams, 1996;Guzmán-Speziale, 2010) and Quaternary displacements are documented (e.g., Burkart, 1978Burkart, , 1983Authemayou et al, 2012). described a relict middle Miocene planation surface which formed at low elevation and covered most of the Polochic-Motagua sliver (the so-called "Mayan paleosurface").…”

Section: North American-caribbean Plate Boundarymentioning

confidence: 99%

“…The present-day North American-Caribbean plate boundary consists of three main sinistral faults which delimitate two crustal-scale slivers: the Motagua (Malfait and Dinkelman, 1972;Plafker, 1976), Polochic (Burkart, 1978;Deaton and Burkart, 1984;Sánchez-Barreda, 1981) and Ixcán (Guzmán-Speziale, 2010) faults (Fig. 2).…”

Section: North American-caribbean Plate Boundarymentioning

confidence: 99%

Geomorphic analysis of transient landscapes in the Sierra Madre de Chiapas and Maya Mountains (northern Central America): implications for the North American–Caribbean–Cocos plate boundary

Andreani

Gloaguen

2016

Earth Surf. Dynam.

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Abstract. We use a geomorphic approach in order to unravel the recent evolution of the diffuse triple junction between the North American, Caribbean, and Cocos plates in northern Central America. We intend to characterize and understand the complex tectonic setting that produced an intricate pattern of landscapes using tectonic geomorphology, as well as available geological and geophysical data. We classify regions with specific relief characteristics and highlight uplifted relict landscapes in northern Central America. We also analyze the drainage network from the Sierra Madre de Chiapas and Maya Mountains in order to extract information about potential vertical displacements.Our results suggest that most of the landscapes of the Sierra Madre de Chiapas and Maya Mountains are in a transient stage. Topographic profiles and morphometric maps highlight elevated relict surfaces that are characterized by a low-amplitude relief. The river longitudinal profiles display upper reaches witnessing these relict landscapes. Lower reaches adjust to new base-level conditions and are characterized by multiple knickpoints.These results backed by published GPS and seismotectonic data allow us to refine and extend existing geodynamic models of the triple junction. Relict landscapes are delimited by faults and thus result from a tectonic control. The topography of the Sierra Madre de Chiapas evolved as the result of (1) the inland migration of deformation related to the coupling between the Chiapas Massif and the Cocos forearc sliver and (2) the compression along the northern tip of the Central American volcanic arc. Although most of the shortening between the Cocos forearc sliver and the North American Plate is accommodated within the Sierra de Chiapas and Sierra de los Cuchumatanes, a small part may be still transmitted to the Maya Mountains and the Belize margin through a "rigid" Petén Basin.

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Offset across the Polochic fault of Guatemala and Chiapas, Mexico

Cited by 72 publications

References 0 publications

Genetic diversity and structure ofJatropha curcasL. in its centre of origin

Genetic diversity and structure ofJatropha curcasL. in its centre of origin

Genetic Diversity in Jatropha curcas Populations in the State of Chiapas, Mexico

Geomorphic analysis of transient landscapes in the Sierra Madre de Chiapas and Maya Mountains (northern Central America): implications for the North American–Caribbean–Cocos plate boundary

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