Field guide for the historical mining site of Mineral de Pozos, Guanajuato, east-central Mexico

2012 ◽  
pp. 39-44 ◽  
Author(s):  
Alejandro Carrillo-Chávez ◽  
Gilles Levresse ◽  
Juventino Martínez Reyes
Keyword(s):  
Central Mexico ◽  
Mining Site ◽  
East Central ◽  
Field Guide ◽  
Historical Mining

The Tuzancoa Formation: Evidence of an Early Permian Submarine Continental Arc in East-Central Mexico

2005 ◽  
Vol 47 (9) ◽  
pp. 901-919 ◽  
Author(s):  
L. Rosales-Lagarde ◽  
E. Centeno-García ◽  
J. Dostal ◽  
F. Sour-Tovar ◽  
H. Ochoa-Camarillo ◽  
...  
Keyword(s):  
Central Mexico ◽  
Early Permian ◽  
East Central ◽  
Continental Arc

scholarly journals Resource Allocation Among Cladodes of Opuntia Robusta From East-central Mexico

2021 ◽  
Author(s):  
Héctor Javier León-Solano ◽  
Mariusz Krzysztof Janczur ◽  
Emilio González-Camarena ◽  
Marcin Czarnoleski ◽  
Bartosz Jenner ◽  
...  
Keyword(s):  
Resource Allocation ◽  
Salicylic Acid ◽  
Resource Availability ◽  
Stress Factors ◽  
Central Mexico ◽  
Hydroxybenzoic Acid ◽  
East Central ◽  
Vegetative Tissues ◽  
Resource Availability Hypothesis ◽  
New Hypothesis

Abstract The Optimal Defense Hypothesis (ODH) predicts that younger, more valuable plant organs should be better defended. We tested this hypothesis in Opuntia robusta Wendl. since its sequential, hierarchical and segmented architecture permits the consideration of a possible reallocation of secondary metabolites among cladodes with different age. We performed a field study taking samples of vegetative tissues from cladodes of different orders during eight months, and a field experiment, by covering either apical or basal cladodes with a fabric. We determined the content of 4-hydroxybenzoic acid (4-HBA), chlorogenic acid (CGA), quercetin (QUE) and salicylic acid (SA). 4-HBA and CGA followed the predictions of ODH. QUE followed an inverse tendency. SA did not show any tendency related either with the position of the cladode or the treatment (light vs. shade) however, its concentration was positively correlated with the concentration of 4-HBA. As we detected SA only in a low proportion of cladodes and 4-HBA in all cladodes, we hypothesize the conversion of the latter metabolite to the former one. Contrary to ODH, CGA presented lower concentrations in apical than in basal cladodes when co-occurred with SAL, and QUE was transferred from apical (younger) to basal (older) cladodes. In this study, we found contradictions in the premises and outcomes of both the Resource Availability Hypothesis (RAH) and the ODH, suggesting that a new hypothesis concerning the plant defense against stress factors should be proposed.

The life story of a gomphothere from east-central Mexico: a multidisciplinary approach

2021 ◽  
pp. 103442
Author(s):  
Alejandro Hiram Marín-Leyva ◽  
Luisa Mainou ◽  
Victor Adrian Perez-Crespo ◽  
Luisa Straulino ◽  
Irving Minero Arreola ◽  
...  
Keyword(s):  
Multidisciplinary Approach ◽  
Life Story ◽  
Central Mexico ◽  
East Central

Fossil crabs (Crustacea: Decapoda) from the Late Cretaceous cárdenas Formation, east-central Mexico

1995 ◽  
Vol 69 (2) ◽  
pp. 340-350 ◽  
Author(s):  
Francisco J. Vega ◽  
Rodney M. Feldmann ◽  
Francisco Sour-Tovar
Keyword(s):  
Late Cretaceous ◽  
Fossil Record ◽  
New Genus ◽  
Gulf Coast ◽  
Central Mexico ◽  
New Genus And Species ◽  
East Central ◽  
The Family ◽  
Marine Lagoon ◽  
First Time

Twenty-four nearly complete carapace samples were collected at three different localities of the Maastrichtian (Late Cretaceous) Cárdenas Formation in San Luis Potosí, east-central Mexico. The material has been assigned to five families: the Callianassidae, Dakoticancridae, Carcineretidae, ?Majidae, and Retroplumidae. Two genera of callianassid shrimp are described, Cheramus for the first time in the fossil record. Dakoticancer australis Rathbun is reported as the most abundant crustacean element; one new genus and species of carcineretid crab, Branchiocarcinus cornatus, is erected, and a single, fragmentary specimen is questionably referred to the Majidae. The three localities reflect paleoenvironmental differences, exhibited by different lithologies, within marginal marine, lagoon environments. The record of dakoticancrid crabs in the Cardenas Formation extends the paleobiogeographic range of the family and the genus Dakoticancer. Carcineretid crabs, although not abundant, seem to have been a persistent element of crustacean assemblages in clastic environments during the Late Cretaceous of the ancestral Gulf Coast of Mexico.

Mid-Cretaceous basin margin carbonates, east-central Mexico

Sedimentology ◽  
1993 ◽  
Vol 40 (3) ◽  
pp. 539-556 ◽  
Author(s):  
PAUL ENOS ◽  
BRYAN P. STEPHENS
Keyword(s):  
Central Mexico ◽  
East Central ◽  
Basin Margin
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