scholarly journals GPS velocities and the construction of the Eastern Cordillera of the Colombian Andes

2016 ◽  
Vol 43 (16) ◽  
pp. 8407-8416 ◽  
Author(s):  
Héctor Mora-Páez ◽  
David J. Mencin ◽  
Peter Molnar ◽  
Hans Diederix ◽  
Leonardo Cardona-Piedrahita ◽  
...  
Keyword(s):  
Eastern Cordillera ◽  
Colombian Andes ◽  
Gps Velocities

Passiflora splendida and P. quinonesiae, two new species of Passiflora supersection Tacsonia (Passifloraceae) from the Colombian Andes

Phytotaxa ◽  
2016 ◽  
Vol 268 (3) ◽  
pp. 181
Author(s):  
MIGUEL MACGAYVER BONILLA MORALES ◽  
ADRIANA CAROLINA AGUIRRE-MORALES ◽  
CREUCÍ MARÍA CAETANO
Keyword(s):  
New Species ◽  
Conservation Status ◽  
Stem Size ◽  
Eastern Cordillera ◽  
Floral Tube ◽  
Taxonomic Key ◽  
The Andes ◽  
Colombian Andes ◽  
Two New Species

Two new species, Passiflora splendida and P. quinonesiae of the section Colombiana from the Andes of Cundinamarca Department (Colombia Eastern Cordillera) are described and illustrated. Passiflora splendida is morphologically similar to P. cremastantha of the series Leptomischae, but can be distinguished by its linear stipules, petioles up to 1.8 cm long, lance-ovate leaves (6–8.5 × 2.5–3.3 cm), flowers with a diameter of 9–11 cm long, sepals and petals with intermediate disposition, both longer than the floral tube, floral tube of 3.2–4.5 cm long and fusiform ovary. Passiflora quinonesiae is similar to the species of series Colombianae, most closely related to P. cuatrecasasii and P. lanata. It differs from P. cuatrecasasii by its terete stem, size of the leaves 4.4–15 × 10.3 cm, elliptic bracts and floral tube 5.2–6 cm long. It differs from P. lanata by its ovate leaves, bracts halfway down the floral tube, elliptical sepals and petals, and elliptical ovary. In addition, a taxonomic key to section Colombiana ser. Colombianae and Leptomischae for Colombia is included and information about the ecology, distribution, and conservation status of P. splendida and P. quinonesiae are discussed.

scholarly journals Gene flow and Andean uplift shape the diversification of Gasteracantha cancriformis (Araneae: Araneidae) in Northern South America

2018 ◽  
Author(s):  
Fabian C. Salgado-Roa ◽  
Carolina Pardo-Diaz ◽  
Eloisa Lasso De Paulis ◽  
Carlos F. Arias ◽  
Vera Nisaka Solferini ◽  
...  
Keyword(s):  
Genetic Variation ◽  
Gene Flow ◽  
South America ◽  
Color Polymorphism ◽  
Early Pleistocene ◽  
Eastern Cordillera ◽  
Colombian Andes ◽  
The Face ◽  
Andean Uplift ◽  
Northern South America

ABSTRACTAimThe Andean uplift has played a major role shaping the current Neotropical biodiversity. However, in arthropods other than butterflies, little is known about how this geographic barrier has impacted species historical diversification. Here we examined the phylogeography of the widespread and color polymorphic spider Gasteracantha cancriformis to: (i) evaluate the effect of the northern Andean uplift on its divergence and, (ii) assess whether its diversification occurred in the presence of gene flow.LocationNorthern Andes and BrazilMethodsWe inferred phylogenetic relationships and divergence times in G. cancriformis using mitochondrial and nuclear data from 105 individuals in northern South America. Genetic diversity, divergence and population structure were quantified. We also compared multiple demographic scenarios for this species using a model-based approach (PHRAPL) to establish divergence with or without gene flow. Finally, we evaluated the association between genetic variation and color polymorphism.ResultsBoth nuclear and mitochondrial data supported two well-differentiated clades, which correspond to populations occurring in opposite sides of the Eastern cordillera of the Colombian Andes. The splitting between these clades occurred in the early Pleistocene, around 2.13 million years ago (95% HPD = 0.98–3.93).Despite this vicariant event, there is shared genetic variation between the clades, which is better explained by a scenario of historical divergence in the face of gene flow. Color polymorphism was randomly scattered in both clades and is not statistically associated with the genetic variation studied here.Main ConclusionsThe final uplift of Eastern cordillera of the Colombian Andes was identified as the major force that shaped the diversification of G. cancriformis in Northern South America, resulting in a cis- and trans-Andean phylogeographic structure for the species. The divergence in the face of gene flow between cis- and trans-Andean populations found for this spider has been likely facilitated by the presence of low-elevation passes across the Eastern Colombian cordillera. Our work constitutes the first example where the Andean uplift coupled with gene flow influenced the evolutionary history of an arachnid lineage.

scholarly journals Influence of salt in the tectonic development of the frontal thrust belt of the eastern Cordillera (Guatiquía area, Colombian Andes)

2015 ◽  
Vol 3 (4) ◽  
pp. SAA17-SAA27 ◽  
Author(s):  
Vanessa Parravano ◽  
Antonio Teixell ◽  
Andrés Mora
Keyword(s):  
Structural Model ◽  
Salt Tectonics ◽  
Thrust Belt ◽  
Eastern Cordillera ◽  
Salt Migration ◽  
Colombian Andes ◽  
Kinematic Evolution ◽  
Geologic Maps ◽  
History Of ◽  
Tectonic Development

Geologic maps, seismic lines, and data from a dry exploration well were used to develop a new structural model for a segment of the eastern foothills of the Eastern Cordillera of Colombia, emphasizing the role of salt tectonics. Milestones in the deformation history of the Guatiquía foothills were studied by sequential section restoration to selected steps. Uncommon structural geometries and sparse salt occurrences were interpreted in terms of a kinematic evolution in which Cretaceous salt migration in extension produced a diapiric salt wall, which was subsequently welded during the main episodes of the Andean compression, when the salt wall was squeezed generating a large overturned flap. Salt-weld strain hardening resulted in breakthrough thrusting across the overturned flap in late deformation stages. We have evaluated a pattern of salt tectonics previously unrecognized in the foothills thrust belt, which may be significant in other parts of the external Colombian Andes.

The acaulescent rosette species of Lupinus L. (Fabaceae) of Colombia and Ecuador including a new species from Colombia

Phytotaxa ◽  
2018 ◽  
Vol 364 (1) ◽  
pp. 61
Author(s):  
NATALIA CONTRERAS-ORTIZ ◽  
ORLANDO A. JARA-MUÑOZ ◽  
COLIN E. HUGHES
Keyword(s):  
New Species ◽  
Key To Species ◽  
Eastern Cordillera ◽  
Colombian Andes ◽  
New Synonym ◽  
Northern Portion ◽  
A New Species

We present a taxonomic synopsis of the acaulescent rosette species of Lupinus from Colombia and Ecuador, including a checklist with revised nomenclature and a key to species. A new species, Lupinus luisanae, and a variety of this species, L. luisanae var. ocetensis, endemic to the northern portion of the Eastern Cordillera of the Colombian Andes, are described and illustrated. Lupinus inflatus is proposed as a new synonym of L. nubigenus.

Sign in / Sign up

Export Citation Format

Share Document