South Mexico Research Articles

Language Perceptions of New Mexico: A Focus on the NM Borderland

New Mexico is located along the U.S.–Mexico border, and as such, Spanish, English, and language mixing form an integral part of the New Mexican identity. New Mexico is often divided into a northern and a southern region with the north known for Spanish archaisms due to historic isolation, and the south associated with ties to a Mexican identity due to the location of the U.S.–Mexico border. The current study uses perceptual dialectology to capture the way in which speakers in the south of New Mexico perceive this north/south divide and communicate their identity. Overall, there is evidence of the north/south divide, but speakers in southern New Mexico focus much more on language use such as Spanglish, English, and Spanish than on their northern counterparts. Participants reference language mixing over language “purity” and borders over an explicit rural/urban divide. Like previous accounts, we see reference to the “correctness” of both English and Spanish, examples of specific terminology used in different parts of the state, and descriptions of accents throughout the state.

Place-based strategies for sustainable and inclusive regional development in the south of Mexico

Place-based strategies for sustainable and inclusive regional development in the south of Mexico

Labor Borders: Recruitment of Central American Migrants in “Exodus” through Southern Mexico and Indigenous Mexican “Braceros” in the Californian Fields

The article proposes the concept of “labor border” to explore the evolution of migration policies in the Central America-Mexico-USA region by investigating the dimension of work, through two case studies: (1) the US H-2A program for the temporary recruitment of foreign agricultural workers from Mexico; and subsequently (2) the Mexican regularization programs with temporary labor opportunity, implemented by the Mexican government in the context of the so-called “Central American exodus”: Social Emergency Program (Programa de Emergencia Social) and Sowing Life (Sembrando Vida). The objective of the research is to analyze how the political use of a labor border contributes to the social construction of a hierarchy of immigrant workers, as well as to the progressive closure of borders, and the outsourcing of control operations by the USA to the south of Mexico and other Central American countries. The research took place between March 2016 and December 2021, with a combination of mainly qualitative methodologies.

First robber fly described from Mexican amber (Diptera: Asilidae: Laphriinae)

ABSTRACT Asilidae represents one of the most diverse Diptera families, the adults are rapacious predators of arthropods. Despite the huge diversity of extant species, robber flies are considered uncommon to extremely rare in amber or any type of fossil. Here we present the first Laphriinae fossil description from Miocene based on a well-preserved adult male trapped in amber from Simojovel, Chiapas, Mexico. The fossil corresponds to a new genus and species named Mioatomosites mexicanus gen. et sp. nov. This fly was likely a tree visitor, inhabiting tree trunks and vegetation, such as the Hymenaea trees that grew near mangrove swamps in Chiapas during the Miocene, which increased the chance of it being trapped in the amber. The new taxon is described and compared with other extant similar Neotropical Laphriinae genera. We postulate that Mioatomosites gen. nov. would be likely placed at the root of a given clade comprising the extant related genera, but future phylogenetic studies are necessary to better understand the relationship among Atomosiini genera. The South American continent is considered a centre of diversity for Atomosiini. This fossil record and the presence of extant Atomosiini genera in the Caribbean islands, which are currently far away from the continent, indicates that a complete land bridge would not be necessary for these “early species” to colonize what today is Central America and South of Mexico during the Miocene or even earlier.http://www.urn:lsid:zoobank.org:pub:63E9410B-D8F1-4A72-ACB0-C302525ADB35 http://www.urn:lsid:zoobank.org:act:5797565F-3F3F-46CF-A982-868F7B1A141F http://www.urn:lsid:zoobank.org:act:1A8CB958-C745-4AF8-81B8-9AD9062E42E7

A taxonomic revision of Neotropical Connarus (Connaraceae)

AbstractThe pantropical genus Connarus is the largest within Connaraceae and comprises ca. 80 species, most of which occur in the Neotropics. The genus is potentially economically important as several taxa produce metabolites of medicinal interest. Morphologically, Connarus differs from other members of the family mainly by the punctate perianth, the single carpel and follicular and relatively broader fruits than in the other genera. In the decades after the publication of the Flora Neotropica monograph of Connaraceae, new botanical collections have become available, especially in American herbaria, allowing identification of overlooked characters and, hence, redefinition of species circumscriptions. In addition, a significant number of typifications were outdated and taxonomic novelties have recently been proposed – all elements that justify a revisional work. After intensive examination of herbarium specimens and field expeditions, the present study recognizes 57 species, 2 varieties and 2 subspecies of Connarus in the Neotropics; about 100 specific names were evaluated, 39 of which are here considered heterotypic synonyms, 11 of them are new synonyms. The distribution of Neotropical Connarus ranges from south Mexico to south Brazil and, although most species occur in dense wet forests, especially in the Amazonia and Atlantic Forest, some are dispersed in savannas from Brazil, Colombia and Venezuela, in Brazilian coastal vegetations or in montane formations; wide distributions are commonly seen in wet forests from Central America to northern South America, while restricted occurrences or endemism are mainly observed in the Atlantic Forest, Peru and Venezuela. Complete morphological descriptions of the species of Neotropical Connarus are provided here, as well as illustrative images, identification keys, and detailed discussions of their taxonomy, nomenclature, distribution and habitat.

Kinematics, intensity, and spatial arrangement of extensional fractures in the Tuxtla-Malpaso fault system: Chiapas strike-slip fault province, southern Mexico

We describe the orientation, number, size, distribution, and fracture spatial arrangement in the central part of the kilometric Tuxtla-Malpaso fault system, one of the largest in the south of Mexico which cuts Cretaceous calcareous rocks. In this area, there are two sub-vertical extensional fracture sets (T1 and T2). The T1 fractures have ∼ N–S orientation and recorded 4.48 % of extension. The T2 fractures cut the T1 fractures, have NE-SW orientation, and accommodate an amount of extension of 3.87 %. These two fracture sets are parallel to two normal fault groups. The youngest normal faults (F2) have NE-SW strike and cut the N–S normal faults (F1). The F1 faults record a reactivation as strike-slip faults contemporaneous with F2.The T1 and T2 fractures have a fracture intensity between 9.08 and 9.39 (P10) on mesoscopic scale. In the case of the spacing, the value of this parameter (0.28–1) is related to fracture clustering. This behavior agrees with the values of fractal box dimension (0.72–0.81), correlation dimension (0.24–0.6), Lyapunov exponent (1.31–2.42), and coefficient of variation (0.94–1.85) on mesoscopic scale. The cumulative aperture vs. distance shows that T1 and T2 fractures have heterogeneous strain distribution. The fracture spatial arrangement is verified with the normalized correlation count analysis (NCC). The NCC graphs show a clustering behavior for T1 and T2 fractures, which are related to a regulary-spaced fractal clusters pattern. We suggest that this pattern is related to the mechanical stratigraphy and the strain location in the fault zones, while the fracture intensity depends on the degree of fracture clustering and rock type more than the amount of strain.Finally, the T1 fractures were associated with the right strike-slip kinematic for the NW-SE Tuxtla-Malpaso fault. This activity recorded a transtension behavior during the middle Miocene. The T2 fractures were formed during the reactivation (Pliocene) of the Tuxtla-Malpaso fault as the left strike-slip fault behind wrenching-transpression kinematics.

First report of Kurthia gibsonii in the digestive system of Apis mellifera in an indigenous community in the south of Mexico

The insect digestive system is an outstanding niche for recognizing and understanding features and interactions with unique microbiota. Apis melliferaplay an important role in honey production and pollination, but their populations have decreased over time, so their study and comprehension are vital. Specimens were collected to study the culturable microbiota of the digestive system in an indigenous community in southern Mexico. Digestive samples of bees from four apiaries were randomly analyzed and cultured, and Gram-positive bacilli were identified through conventional biochemical tests and with molecular markers. Kurthia gibsoniiwas identified in 7.5% (6/80) of the cases, and the sequences obtained were reported in GenBank. This is the first report of K. gibsoniiin the digestive system of bees in apiaries in southern Mexico.

Phytopathology and cultural behaviors: putative introduction of Chaya-strain of Cassava common mosaic virus to Costa Rica

Leaves of the shrub chaya (Cnidoscolus aconitifolius), spinach tree or ‘chicasquil’ (in Costa Rica), are consumed in the Mesoamerican culinary tradition, having its origin in South Mexico and Guatemala. The objective of this work was to verify the viral nature of the observed in a chaya plant disease and to identify the species of the virus. Plant virus detection and identification was achieved by TEM, RT-PCR using degenerated primers to potexviruses, and sequencing. Pathogenicity tests were done by mechanical inoculation using chaya symptomatic tissue, on Nicotiana benthamiana and chaya plants. We report CsCMV detection in a chaya plant in Costa Rica with mosaic symptoms. Pathogenicity and association of virus and symptoms were demonstrated by mechanical inoculation in Nicotiana benthamiana and chaya plants. We hypothesize this infection corresponds to a recent introduction and discussed how cultural traditions impact the distribution of plant viruses. The findings confirm the presence of a CsCMV-related virus, previously unreported for Costa Rica, in Cnidoscolus aconitifolius. The results herein highlighted the need to study its distribution and diversity throughout Latin America.

Using the Expanded Andersen Model to Determine Factors Associated with Mexican Adolescents' Utilization of Dental Services.

Many factors contribute as facilitators of or barriers to adolescents' use of dental services. Guided by the expanded Andersen model for dental service utilization, the aim of this study was to identify factors associated with the use of dental services among adolescents ages 12-16 in south Mexico City (n = 247). Adolescents answered a questionnaire on predisposing factors (age and gender), enabling factors (socioeconomic status, oral health support, parental years of education, and previous dental treatments), and psychosocial and behavioral factors (attitudes towards oral health; knowledge of gingivitis; alcohol, drug, and tobacco use; and depressive symptoms), and they underwent a visual clinical exam to determine their need factors (caries and gingivitis). The adolescents reported whether or not they had attended a dental visit in the last year for any reason. Multiple logistic regression was used to evaluate these factors. Having oral health support increased the odds of a dental visit by 2.69 (95% CI = 1.24-5.84). Previous dental treatment increased the odds of a dental visit by 2.25 (95% CI = 1.12-4.52). The presence of depressive symptoms reduced the odds of a dental visit by 4% (OR = 0.96, 95% CI = 0.94-0.99). Enabling and psychosocial factors of oral health support and previous dental treatment were positively associated with the utilization of dental services, while depressive symptoms were negatively associated.

Prevalence of plaque and dental decay in the first permanent molar in a school population of south Mexico City

Prevalence of plaque and dental decay in the first permanent molar in a school population of south Mexico City

Confirming the presence of Lasiurusfrantzii (Peters, 1870) (Chiroptera, Vespertilionidae) in South America: more questions than answers.

The western or desert red bat, Lasiurusfrantzii, is a cryptic insectivore species distributed in the Neotropics from Mexico south through Central America to Panama. L.frantzii was long considered a subspecies of the red bat, Lasiurusblossevillii, but recently it was elevated to full-species status based on genetic information. Here we present evidence of the presence of L.frantzii in the Andean Region of Colombia, confirming the species' presence in South America; the new record, from 3836 m a.s.l., is also the highest elevation known for the species. We suggest that L.frantzii might be widely distributed in trans-Andean areas of Colombia, Ecuador, Venezuela, and perhaps Peru and Bolivia. However, a review and exploration of additional morphological traits to identify the species are necessary because of the uncertainty of the distribution of L.frantzii.

High TGM1 Allelic Heterogeneity causing Lamellar ichthyosis in a small geographic area in South Mexico: Another Example of the “Réunion Paradox”

Lamellar ichthyosis (LI) is an autosomal recessive congenital ichthyosis characterized by generalized dry skin and severe scaling. It is caused by biallelic mutations in the TGM1 gene, however molecular data from non-Caucasian populations are limited. Results of genetic-molecular analysis of a group of LI pedigrees originating from two close small populations from south Mexico are presented. LI affected individuals belonging to 9 apparently unrelated families were studied. Exome sequencing or Sanger sequencing in probands from each family was carried out. Furthermore, DNA from 294 unaffected subjects from one of the communities were Sanger sequenced to determine the carrier frequency of the c.427C > T TGM1 variant. Five different TGM1 pathogenic variants, either in homozygous or in compound heterozygous state, were demonstrated in affected subjects. The two most common variants were c.427C > T (p.Arg143Cys) and c.1159+1G > T. A novel c.1645+1G > T TGM1 pathogenic allele was recognized. Carrier frequency analysis identified a total of 23 individuals heterozygous for the c.427C > T variant, predicting a prevalence of 78 carriers per 1000 inhabitants in the community. A high TGM1 allelic heterogeneity with 5 different LI-causing alleles in a limited geographic area was demonstrated. While the occurrence of homozygosity for a founder mutation is expected in small populations with high frequency of a particular autosomal recessive disorder, the occurrence of multiple pathogenic alleles has been previously described, a situation known as the Reúnion paradox. Our results expand the current knowledge of the mutational spectrum of TGM1-linked LI.

Typology and social network of grassroots initiatives that promote agroecology in Mexico

ABSTRACT The study aims to typify the diversity of grassroots initiatives in Mexico, the circumstances (e.g. historical, social, ecological) in which they emerge, and the roles and power relationships they establish with different stakeholders to promote agroecology. It addresses the need to comprehend how grassroots initiatives contribute to social change and the massification of agroecology in Mexico. Analysis was done using PCA and social network analysis from 167 surveys. Results show that grassroots initiatives impact 18 indigenous groups in the center and south of Mexico, and focus on eco-friendly production, social justice, popular education, and food markets. Initiatives started because of three tipping points that responded to neoliberal policies, relocating local food and massifying agroecology. There are 13 types of stakeholders that promote agroecology and influence grassroots initiatives.

Validation of a methodological model to incubate successful agribusinesses in marginalized areas from South Mexico

Given the situation of poverty and marginalization in which most of the communities in the rural areas of the Mexican South Southeast are found, a situation that affects 17 million people classified as in a situation of extreme poverty, agribusiness is an alternative under these conditions for it. An operational and practical methodology is required that allows a good identification and implementation of initiatives according to the situation and the environment. The objective of this work was to validate an operational methodological model called model for the competitiveness of small farmers in extreme poverty based on agribusiness. The validation project was developed in four pilot communities in the Mexican South Southeast considered to be highly marginalized and poor: San Andrés Tuxtla, Veracruz; Tahdziu, Yucatan; Ocotepec, Chiapas and San Jerónimo Taviche, Oaxaca. The applied model consists of four stages, diagnosis, incubation, development and maturity. The diagnosis considered in turn two sub-stages, one on the description of the environment and the actors and the second on the definition of the portfolio of opportunities. The incubation considered the sub-stages of prioritization through a qualification criteria and the business plan itself according to the conditions of the actors and the environment. The development stage is nothing more than the start-up and consolidation of the business with a view to continuous improvement. The results obtained were four agribusinesses in progress, one for each pilot community, with profitability indicators such as the Internal Rate of Return (IRR) of 35.0%, 100.0%, 41.0% and 45.9% for jam production in San Andrés Tuxtla Veracruz, Stevia production and marketing in Tadhziu Yucatán, Hass avocado production and marketing in San Pablo Huacanó Chiapas and tomato production and marketing in greenhouses in San Jerónimo Taviche Oaxaca, respectively. The operational methodological model to identify and develop agribusiness in poor and marginalized communities was successfully validated. It is concluded that it is possible to develop profitable and competitive agribusiness in conditions of extreme poverty and marginalization.

Mexican Sign Language Corpus: Towards an Automatic Translator

The development of the Sign Language Corpus has been motivated by its great utility and application to various purposes and research areas. However, some countries do not have their own Sign Language Corpus. Developing a corpus thereby benefits the community of people with speech disabilities in diverse areas such as education. Thus, the motivation to develop this work is to present an advance toward constructing an RGB-D corpus of Mexican Sign Language captured by a Kinect sensor. A total of 90,000 samples of 570 words and 30 phrases interpreted by 150 people who commonly use Mexican Sign Language were collected. Of the participants, 86 were women and 64 were men, aged between 12 and 60 years old. The Mexican Sign Language Corpus was recorded by signers from three different regions of the south of Mexico. The constructed corpus contains depth, color, point clouds, and human skeleton positions. Six hundred of the most used words were selected from 17 semantic fields, considering the variability in the movement of both hands. After training a neural network, the performance developed by the recognition system was 98.62%.

Adverse drug reactions in neonatal intensive care unit: Characteristics and risk factors

Adverse drug reactions (ADRs) in neonates can significantly affect expected clinical outcomes. The aim of this study was to analyze the prevalence and characteristics of ADRs and identify the risk factors involved in a neonatal intensive care unit (NICU). A prospective cohort study based on intensive pharmacovigilance was carried out in NICU of a public teaching hospital in the south of Mexico. Neonates admitted to the NICU who had between 1 and 90 days of age, with at least 24 hours of hospitalization, and a confirmed suspicion of ADRs were included. The prevalence and characteristics of ADRs were analyzed. Relative ratios (RR) were estimated with 95% confidence intervals (CI) to evaluate the risk factors of ADRs (p˂0.05). 998 newborns were included, 109 ADRs were detected in 75 newborns, the cumulative incidence was 7.51% and the ADRs were mainly probable imputability and moderate severity. The therapeutic group most frequently related to the development of ADRs was anti-infectives for systemic use and the blood and lymphatic system was most affected by the ADRs. Identified risk factors were: female sex (RR 1.58; 95% CI 1.01-2.47), prematurity (RR 5.6; 95% CI 3.45-9.11), low birth weight (RR 2.52; 95% CI 1.63-3.91), length of hospitalization >15 days (RR 12.95; 95% CI 7.89-21.25) and drugs administered >5 (RR 5.92; 95% CI 2.6-13.48). These results should be considered and studied in greater depth, which will allow the prevention of the development of ADRs in this group of patients.

Elaphomycescastilloi (Elaphomycetaceae, Ascomycota) and Entolomasecotioides (Entolomataceae, Basidiomycota), two new sequestrate fungi from tropical montane cloud forest from south Mexico.

Two new species of sequestrate fungi are described from south Mexico based on morphological and molecular evidences. Here we describe Elaphomycescastilloi characterized by the yellowish mycelial mat, dull blue gleba and ascospores of 9.7-11.5 µm; Entolomasecotioides is characterized by the secotioid basidiomata, sulcate, pale cream pileus, and basidiospores of 7-13 × 5-9 µm. Both species grow in montane cloud forest under Quercus sp. in the state of Chiapas, Mexico. Descriptions, photographs, and multilocus phylogeny for both species are presented.

Fine-Scale Spatial Genetic Structure of Remnant Populations of Abies religiosa, in a Temperate Forest in Central Mexico

Genetic structure of a population can be molded by the resistance of the landscape or the distance between populations that function as barriers to gene flow. We analyzed the population genetic structure of Abies religiosa on a fine spatial scale and examined isolation models by resistance and distance. We collected vegetative tissue from populations located at the altitudinal extremes of the distribution range of the species on three slopes of La Malinche National Park (LMNP) (South, North, and East) in central Mexico. Genomic DNA was obtained using the CTAB 2X method, and eight microsatellite chloroplast loci were amplified. The genetic structure was identified based on an Analysis of Molecular Variance, a Discriminant Analysis of Principal Components with cross-validation and a spatial Principal Component Analysis using the Gabriel-type connectivity network. The isolation hypotheses were evaluated by constructing partial Mantel tests using Reciprocal Causal Modeling and Maximum Likelihood Population Effects models. A genetic structure of isolation by resistance to elevation was identified, and two genetic groups were recognized: one including populations of the South slope and the other comprising populations of the North and East slopes. We detected in Abies religiosa populations of the LMNP an isolation by resistance to elevation that determines the genetic structure, and the greatest genetic exchange between groups of populations located at higher altitudes. It is suggested to promote the connectivity between slopes through assisted migration and immediately halt land-use changes, as part of the actions to preserve genetic diversity in the LMPN. This study contributes to the knowledge of the spatial genetic structure of species at risk in the Mexican temperate forest for their conservation.

Phylogenomics and Biogeography of the Mammilloid Clade Revealed an Intricate Evolutionary History Arose in the Mexican Plateau.

Mexico harbors ~45% of world's cacti species richness. Their biogeography and phylogenomics were integrated to elucidate the evolutionary history of the genera Coryphantha, Escobaria, Mammillaria, Mammilloydia, Neolloydia, Ortegocactus, and Pelecyphora (Mammilloid Clade). We analyzed 52 orthologous loci from 142 complete genomes of chloroplast (103 taxa) to generate a cladogram and a chronogram; in the latter, the ancestral distribution was reconstructed with the Dispersal-Extinction-Cladogenesis model. The ancestor of these genera arose ~7 Mya on the Mexican Plateau, from which nine evolutionary lineages evolved. This region was the site of 52% of all the biogeographical processes. The lineages 2, 3 and 6 were responsible for the colonization of the arid southern territories. In the last 4 Mya, the Baja California Peninsula has been a region of prolific evolution, particularly for lineages 8 and 9. Dispersal was the most frequent process and vicariance had relevance in the isolation of cacti distributed in the south of Mexico. The 70 taxa sampled as Mammillaria were distributed in six distinct lineages; one of these presumably corresponded to this genus, which likely had its center of origin in the southern part of the Mexican Plateau. We recommend detailed studies to further determine the taxonomic circumscription of the seven genera.

Emotional energy communities: Centering emotions and feelings within energy transitions in southern Mexico

Energy communities are key to understanding the drivers and impacts of energy transformations. However, research focused on profiling and evaluating energy communities has often overlooked the fundamental role of emotions and emotional processes during energy transitions. To address this, our article draws together the Latin American concept of ‘emotional communities’ with the prevailing European concept of ‘energy communities’; resulting in an enriched term of ‘emotional energy communities’ in which the emotional dimensions of energy are centered. Looking at two previously non-electrified multi-ethnic communities in the south of Mexico, we identified three crucial energy moments: a) living without electricity; b) counting on electricity produced by off-grid solar systems, and c) returning to living without electricity but now with the knowledge of what electricity enables. We retrospectively explored the emotions associated with these three energy moments via in-depth interviews and focus groups, finding that electrification was an inflection point for these two communities. The solar interventions generated new identities, and a range of positive and negative emotions, which fluctuated over time and varied by factors such as gender, age, and ethnicity. By looking at emotional processes, rather than singular emotional states, we were able to conduct a more complex analysis of both individual and community-level lived experiences and the impacts of energy interventions. In doing so, we highlight the importance of considering emotions within energy studies, as well as the need to look beyond households as a unit of analysis, particularly outside of westernized contexts where public and private spheres are blurred.