A5052395866- Fish biology, ecology, and behavior
- Fish Biology and Ecology Studies
- Fish Ecology and Management Studies
- Genetic diversity and population structure
- Ichthyology and Marine Biology
- Identification and Quantification in Food
- Evolution and Paleontology Studies
- Congenital Heart Disease Studies
- Urological Disorders and Treatments
- Congenital Diaphragmatic Hernia Studies
- Renal and related cancers
- Scarabaeidae Beetle Taxonomy and Biogeography
- Amphibian and Reptile Biology
- Advanced Queuing Theory Analysis
- Coronary Artery Anomalies
- Cardiac Structural Anomalies and Repair
- Genomics and Phylogenetic Studies
- Nasolacrimal Duct Obstruction Treatments
- Transboundary Water Resource Management
- Prenatal Screening and Diagnostics
- Tuberous Sclerosis Complex Research
- Tumors and Oncological Cases
- Pediatric Urology and Nephrology Studies
- Structural Integrity and Reliability Analysis
- Tracheal and airway disorders
Field Museum of Natural History
2022-2025
Houston Museum of Natural Science
2017-2024
Louisiana State University
2017-2024
Louisiana State University Agricultural Center
2022
University of San Carlos of Guatemala
2015-2022
University of California, Merced
2022
Southeastern Louisiana University
2015-2021
Hospital Italiano de Buenos Aires
2004-2010
Abstract Aim The processes that generate biodiversity occur at finer scales than are often studied, particularly in freshwater systems of the northern Neotropics. We investigate whether fine‐scale biogeographic patterns present within larger Grijalva–Usumacinta Area Endemism (AoE) —a region Middle America where nearly 60% fishes endemic—and if present‐day river basins single historical units. Location Northern Central and southern Mexico. Taxon Freshwater (e.g., Cichlidae, Poeciliidae,...
Choosing among types of genomic markers to be used in a phylogenomic study can have major influence on the cost, design, and results study. Yet few attempts been made compare categories next-generation sequence limiting our ability suitability these different fragment types. Here, we explore properties find if they vary accuracy component phylogenetic trees clarify causes conflict obtained from data sets or inference methods. As test case, discordance between hypotheses using novel set...
Hyphessobrycon is one of the most species rich and widely distributed genera in family Characidae, with more than 160 ranging from Veracruz, Mexico to Mar Chiquita Lagoon Buenos Aires, Argentina. The majority diversity shows a cis -Andean distribution; only nine are trans including H . compressus (Meek 1908). It well established that not monophyletic but it has been suggested natural groups can be identified within larger group. In this study, we tested monophyly investigated placement We...
Cichlids of the genus Thorichthys are a morphologically diverse clade nine species occurring from Mexico south to Motagua River in Guatemala and Honduras. Our understanding relationships within other genera Northern Neotropical cichlids has improved recent years; however, phylogenetic placement some species, as well population-level variation, remains understudied. panchovillai is polymorphic endemic Coatzacoalcos Atlantic slope Mexico. The was described upper reaches this river, since that...
Objectives The purpose of this series is to present our experience with cases dacryocystocele diagnosed prenatally. role prenatal 3-dimensional sonography, as an adjunct 2-dimensional in the assessment these emphasized. Methods A retrospective review was conducted. Information obtained by reviewing sonographic reports and medical records. Outcomes were from referring obstetricians or directly parents. Results Ten fetuses had diagnosis a congenital at median gestational age 30.1 weeks (range,...
Non-native freshwater fishes have been introduced to Guatemalan ecosystems since the beginning of last century without prior risk assessment or subsequent evaluation their impacts. We synthesized historical records, and distributional data from a literature review, online databases museum records non-native in Guatemala. found for 22 with oldest dating back 1926. were recorded 64% river sub-basins Guatemala we identified that at least 12 species established populations. The Jaguar guapote (...
Abstract Fetal malignancies that are capable of metastasizing to other fetal organs and the placenta exceedingly rare. tumors suspected on ultrasonography in presence structures abnormal shape or size occasionally associated with polyhydramnios hydrops. Most large abdominal masses detected antenatally renal origin, although adrenal should also be kept mind their differential diagnosis. We report a case large‐for‐gestational‐age fetus distention secondary bilateral carcinoma, placental...
Central America contains a rich diversity of freshwater habitats that support more than 600 species fishes. However, despite several perceived threats to the integrity throughout region, formal analysis extinction risk for region’s ichthyofauna is lacking. In this manuscript, we report an updated checklist and novel comprehensive assessment conservation status American fishes by applying IUCN Red List Categories Criteria at global level. We also analyze distribution across generate baseline...
La ictiofauna nativa de la cuenca del río Usumacinta se documentó en el noroeste Guatemala para conocer composición los peces nativos 20 sitios y su importancia pesca artesanal. El estudio incluyó recolecta las especies con diversas artes pesca, evaluación abundancia mediante muestreos transectos e identificación mismas mercados venta, entrevistas pescadores. Se identificó un total 54 especies, 38 géneros, 18 familias 8 órdenes. Las más abundantes fueron Characidae (3 especies), Poeciliidae...
Diadromous fishes can exhibit interesting evolutionary and population-level patterns given their use of freshwater marine environments as part life histories. The River goby genus Awaous are prominent members riverine ichthyofaunas occur throughout Atlantic Pacific slopes the Americas from southern United States to Ecuador Brazil. Here we study widespread polymorphic banana complex assess phylogeographic test previous hypotheses that all populations this species in belong same species....
Northern Middle America (NoMA) is considered a transition zone between the Nearctic and Neotropical biogeographic realms. In this region, freshwater fishes create regional faunas of mixed origin, but their general patterns have not been quantified. To identify such patterns, we delineate regions (BRs) major barriers NoMA summarize faunal similarity among BRs. We used clustering analysis on presence-absence matrix primary secondary to group 97 level-6 HydroBASINs units spanning into assessed...
Vieja melanura is a Neotropical cichlid occurring in the Petén-lake district systems of Guatemala, as well Río Grijalva-Usumacinta basin, and other Southern México, Belize, Guatemala. A caudal stripe, extending forward from peduncle, characteristic this species. This stripe sloped downward nearly all individuals V. melanura, but degree slope highly variable throughout its range. The shape has previously been used diagnosing differentiating between species Vieja. purpose study was to use...
ABSTRACT Pacific and Atlantic-slope rivers of the Isthmus Tehuantepec in Mexico contain two cichlid species genus Vieja relevant to current study, V. zonata coatlicue, respectively. The was initially considered a population uncertain taxonomic status recently described as distinct based on three putatively diagnostic morphological characters. objective this study combine new existing genetic data, along with reanalysis characters, test distinctiveness coatlicue. Little variability no...
The Mayan Biosphere Reserve is the largest protected area in Guatemala. Lake Yaxhá located inside core zone. Using electrofishing, seines and gillnets we assessed fish richness community 2011. We collected 18 species distributed seven families, with Cichlidae (seven species) Poecilidae (five most specious. evaluated effectiveness of electrofishing to sample important artisanal fishery Petén, Petenia splendida, September being month highest capture per unit effort. assemblage was similar...
We documented the first record of non-native species Piaractus brachypomus (Characiformes: Serrasalmidae) in Lago Petén-Itzá, Petén, Guatemala. One brined specimen was donated by a local fisherman San Benito, El Petén. The captured reportedly collected southern basin lake. used mitochondrial gene cytochrome oxidase I (COI) to validate identity specimen. hypothesize that aquarium trade is most likely source introduction Pacu Petén-Itzá.
Abstract A variety of hierarchical gene flow models have been proposed to explain the distribution genetic variation in aquatic environments. These models, including Stream Hierarchy (SH), Death Valley (DV), Headwater (HW), and Widespread Gene (WG) provide testable hypotheses that focus on degree within-basin or within-stream network connectivity an organism’s dispersal abilities. We tested these using Tlaloc hildebrandi (Profundulidae, Cyprinodontiformes), a freshwater fish endemic...