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14 results for “Trans-Mexican Volcanic Belt”
Database of Pines from the Forests paper: "Intraspecific Variation in Pines from the Trans-Mexican Volcanic Belt Grown Under Two Watering Regimes: Implications for Management of Genetic Resources"
<p>Raw data from the Forests paper: "Intraspecific Variation in Pines from the Trans-Mexican Volcanic Belt Grown under Two Watering Regimes: Implications for Management of Genetic Resources" Forests <strong>2018</strong> <em>9</em>(2), 71. doi:<a href="http://dx.doi.org/10.3390/f9020071">10.3390/f9020071. </a></p> <p>The database correspond to seedlings of four Mexican pines: <em>P. oocarpa, P. patula</em> and <em>P. pseudostrobus</em>, that were submitted to two watering treatments: Field Capacity (FC) and Drought-Stress (DS), during 90 days. Growth and biomass, survival and ontogenetic score were measured.</p>
Data from: Environmental and anthropogenic factors mediating the functional connectivity of the mesquite lizard along the eastern Trans-Mexican Volcanic Belt
<p>Functional connectivity, the extent to which a landscape facilitates or impedes the dispersal of individuals across the landscape, is a key factor for the survival of species. Anthropogenic activities such as urbanization, agriculture, and roads, negatively impact functional connectivity of most species, particularly low-vagility species like lizards. Here, we examine how a landscape modified by anthropogenic activities affects the functional connectivity, at both broad and fine scales, of a widely distributed generalist lizard <em>Sceloporus grammicus</em> in the eastern Trans-Mexican Volcanic Belt, Mexico. We estimated for the first time the species genetic structure, gene flow, and functional connectivity in agricultural and forest zones using genomic data, a comprehensive landscape characterization, and novel methods including gravity models. Our results showed marked genetic differentiation across the study region but also that functional connectivity is maintained for tens of kilometers despite <em>S. grammicus</em> low vagility. Specifically, we found that substrate and air temperature facilitated connectivity over broad and fine scales, respectively, while agricultural cover, relative humidity, and slope were important for connectivity and gene flow. Contrastingly, forest cover and roads favored (broad-scale) and limited (fine-scale) connectivity, likely associated with movement facilitated by small forest patches and with thermoregulation. Altogether, these results support that <em>S. grammicus</em> alternates its thermoregulatory behavior depending on the distance traveled and the habitat environmental conditions, and that it can disperse through relatively modified landscapes, mainly using agricultural zones. The information obtained is crucial to understanding the response of lizards to current anthropogenic pressures and their potential to adapt.</p>
Data from: Environmental and anthropogenic factors mediating the functional connectivity of the mesquite lizard along the eastern Trans-Mexican Volcanic Belt
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Data from: Phylogeography and population differentiation in the Psittacanthus calyculatus (Loranthaceae) mistletoe: a complex scenario of climate-volcanism interaction along the Trans-Mexican Volcanic Belt
Aim The formation of the Trans-Mexican Volcanic Belt (TMVB) played an important role in driving inter- and intraspecific diversification at high elevations. However, Pleistocene climate changes and ecological factors might also contribute to plant genetic structuring along the volcanic belt. Here, we analysed phylogeographic patterns of the parrot-mistletoe Psittacanthus calyculatus to determine the relative contribution of these different factors. Location Trans-Mexican Volcanic Belt Methods Using nuclear and chloroplast DNA sequence data for 370 individuals, we investigate the genetic differentiation of 35 populations across the species range. We conducted phylogenetic, population and spatial genetic analyses of P. calyculatus sequences along with ecological niche modelling and Bayesian inference methods to gain insight into the structuring of genetic variation of these populations. Results Our analyses revealed population structure with three genetic groups corresponding to individuals from Oaxaca and those from the central-eastern and western TMVB regions. A significant genetic signal of demographic expansion, an east-to-west expansion predicted by species distribution modelling, and approximate Bayesian computation analyses strongly supported a scenario of habitat isolation and invasion of TMVB by P. calyculatus during the late-Pleistocene. Main conclusions The genetic differentiation of P. calyculatus may be explained by the combined effects of (i) geographical isolation linked to the effects of the glacial/interglacial cycles and environmental factors, driving genetic differentiation from congeners into more xeric vegetation and (ii) the invasion of TMVB from east to west, suggesting a role for both colonization and glacial/interglacial cycles models.
Cryptic diversity across the Trans-Mexican Volcanic Belt of Mexico in the montane bunchgrass lizard Sceloporus subniger (Squamata: Phrynosomatidae)
<p><em>Sceloporus subniger</em> Poglaygen & Smith is a montane bunchgrass lizard distributed across pine-oak forests of central Mexico. Prompted by the discovery of a new population of this lizard in far western Mexico, and by recent studies suggesting <em>S. subniger</em> may be a composite of several distinct species, we examined in more detail the genetic structure of <em>S. subniger</em>. We generated a mitochondrial DNA (mtDNA) dataset from 81 specimens and an ultraconserved elements (UCE) dataset representing thousands of genomic regions from 12 specimens to specifically evaluate the genetic distinctiveness of populations from western Michoacán and adjacent Jalisco along with the newly discovered population in the Sierra de Mascota in western Jalisco. We also recorded morphological data from 47 museum specimens to compare to our genetic data. Results from our analyses of the genetic data, augmented by specimen measurements and scale counts, support the notion that <em>S. subniger</em> is indeed a composite of distinct species. Montane bunchgrass lizards from western Michoacán and adjacent Jalisco, and from the Sierra de Mascota in western Jalisco, each represent distinct new species, which we describe and name here.</p>
Data from: Phylogeography and population differentiation in the Psittacanthus calyculatus (Loranthaceae) mistletoe: a complex scenario of climate-volcanism interaction along the Trans-Mexican Volcanic Belt
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Cryptic diversity across the Trans-Mexican Volcanic Belt of Mexico in the montane bunchgrass lizard Sceloporus subniger (Squamata: Phrynosomatidae)
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Data for influence of avocado orchard landscapes on amphibians and reptiles in the trans-Mexican volcanic belt
<p>This database was used to evaluate the response of the local herpetofauna to conversion of POF to avocado orchards (AO) in the trans-Mexican volcanic belt in Western Mexico (Michoacán state). We also explored the effects of forest cover on species that differ in their levels of habitat specialization. In the avocado belt in Michoacan, we sampled 12 sites representing a gradient of AO embedded in native POF to evaluate the variation in structure of local assemblages of amphibians and reptiles. Reduction of POF cover negatively affected specialist frog and snake species, but this relationship varied among buffers around sampling sites. Generalist species of amphibians and lizards showed increased abundances and richness in sites with low POF cover, whereas snake richness and abundance were higher in sites with high POF cover. Our study suggests that POF conversion to AO is a driver favoring the persistence and success of generalist but not specialist herpetofauna species. Therefore, to conserve the diversity of amphibians and reptiles in these agroecosystems, it is important to ensure high proportion of POF patches.</p>
Data for influence of avocado orchard landscapes on amphibians and reptiles in the trans-Mexican volcanic belt
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FIGURE 7. C in A new tiger beetle from the Trans-Mexican Volcanic Belt (Coleoptera, Cicindelidae, Cicindelini)
FIGURE 7. C. rufiventris reducens var. hoegeana, two representative syntypes of Walther Horn's material in the Senckenberg Deutsches Entomologisches Institut (SDEI). A) Male. B) Female. Photos by Mandy Schröter (SDEI).
FIGURE 4. Cicindelidia cyanipleura n in A new tiger beetle from the Trans-Mexican Volcanic Belt (Coleoptera, Cicindelidae, Cicindelini)
FIGURE 4. Cicindelidia cyanipleura n. sp. Frontal habitus. A) Male. B) Female. Male labrum exhibits a concave margin, medially. Female labrum unidentate, margin not concave medially.
FIGURE 1. Cicindelidia cyanipleura n in A new tiger beetle from the Trans-Mexican Volcanic Belt (Coleoptera, Cicindelidae, Cicindelini)
FIGURE 1. Cicindelidia cyanipleura n. sp. Dorsal habitus of holotype and a paratype, respectively (both male), illustrating variation. Most individuals are immaculate, but a small number of specimens possess a middle band reduced to spots with faint connecting lines anteriorly.
FIGURE 6 in A new tiger beetle from the Trans-Mexican Volcanic Belt (Coleoptera, Cicindelidae, Cicindelini)
FIGURE 6. Cicindelidia rufiventris reducens, two representative syntypes of Walther Horn's material in the Senckenberg Deutsches Entomologisches Institut (SDEI). A) Male. B) Female. Photos by Mandy Schröter (SDEI).
FIGURE 3. Cicindelidia cyanipleura n in A new tiger beetle from the Trans-Mexican Volcanic Belt (Coleoptera, Cicindelidae, Cicindelini)
FIGURE 3. Cicindelidia cyanipleura n. sp. Lateral habitus of male paratype.
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