Javier Carmona Jiménez

• Doctor of Philosophy
• National Autonomous University of Mexico

The characterization of hydromorphological quality is the evaluation of the physical structure and the flow regime associated with fluvial ecosystems. Its value indicates the state of ecosystem conservation, as well as the anthropogenic pressures that disturb it. The present study proposes an hydromorphological quality (HYQI) index that aims to est...

The present study describes two new Nostoc species, N.montejanii and N.tlalocii, based on a polyphasic approach that combines morphological, ecological, and genetic characteristics. The five investigated populations, including those from newly collected material from central Mexico, were observed to possess morphological features characteristic of...

Background: Several studies of lotic ecosystems have provided important ecological information on the influence of environmental heterogeneity on macroscopic algae composition. Hypothesis: The highest species diversity will occur during the cold-dry season, correlated to low temperature and oligothrophic water, while the distribution of each specie...

In Latin America, conservation is a subject that cannot be understood outside of the social processes that determine the different conceptions, uses and customs related to nature and water. Mexico is an example of ecosystem diversity, where rural populations see their homes and ecosystems threatened by the uncontrolled advance of urban sprawl. In a...

In the Basin of Mexico, one of the most important economic regions in the country with over 22 million inhabitants, peri-urban streams have been transformed into sewers, drains, and pipes to avoid flooding or unsanitary conditions; the change affects not only the ecosystem's goods and services but also the aquatic communities that support the natur...

Polyphasic analysis was carried out of natural samples and strains isolated from Phormidium mats, collected from different Spanish rivers with distinct water quality. 16S rRNA gene analysis separated five main clusters in a phylogenetic tree corresponding to five main, previously observed morphotypes. Two isolated strains and three natural samples...

We examined community structure of benthic diatoms and their substratum preferences (epilithic vs. macroalgae) by season in 4 tropical mountain streams in central Mexico. Of the 74 species compiled, Cymbella silesiaca, Rhoicosphenia abbreviate, and Reimeria sinuata were the most abundant and frequent. About 14% of species were exclusively epilithic...

We assessed macroalgal responses to anthropogenic pressures in the Basin of Mexico to examine whether these biological indicators exhibited a discriminatory and explanatory correlation with ecological quality and propose the "Macroalgae Ecological Quality Index" (MEQI). The proposal included 3 steps: i) characterization of trophic level and hydromo...

Cyanobacteria inhabiting lotic environments have been poorly studied and characterized in Mexico, despite their potential risks from cyanotoxin production. This article aims to fill this knowledge gap by assessing the importance of benthic cyanobacteria as potential cyanotoxin producers in central Mexican rivers through: (i) the taxonomic identific...

The development of anthropic activities during recent years has led to an increase in nutrient fluxes in the Río Grande de Comitán and Montebello Lakes National Park, Mexico. In turn, this has modified the dynamics of the biotic community, specifically favoring the presence of cyanobacteria tolerant to contamination. The continual and massive prese...

Cocconeis ectorii and C. azteca are described as new species based on unialgal strains, cultivated from samples collected in streams of Mexico, California, and Germany. For C. ectorii, strains from Mayotte Island and Spain were re-analysed. Although these two new species belong morphologically within the C. placentula group, genetic distances for t...

Esta obra expresa, a través de representaciones cartográficas, información sobre las relaciones espaciales y los procesos humanos en un territorio que ha enfrentado importantes presiones socioambientales: la cuenca Río Grande de Comitán-Lagos de Montebello, Chiapas. En sus páginas se conceptualiza y describe a dicha cuenca como un sistema dinámico...

Protected areas (PA) are the main conservation instrument in Latin America, but rural communities are rarely integrated into decision-making. In Mexico, many conflicts fall on guaranteeing equitable access to resources for locals against private economic interests. The aim of this manuscript was to present a strategy to evaluate the functioning of...

The present study describes two new Nostoc species, N. montejanii and N. tlalocii, based on a polyphasic approach that combines morphological, ecological, and genetic characteristics. The five investigated populations, including those from newly collected material from central Mexico, were observed to possess morphological features characteristic o...

In Latin America, conservation is a subject that cannot be understood outside of the social processes that determine the different conceptions, uses and customs related to nature and water. Mexico is an example of ecosystem diversity, where rural populations see their homes and ecosystems threatened by the uncontrolled advance of the urban sprawl....

The macroinvertebrates associated with algae casts light on the possibility of coevolution in a specific environmental context. The understanding of how biological and environmental factors could favor, or limit such interactions and represent an important step for the comprehension of river socio-ecology dynamics. The aim of this study is to estab...

Due to their dimensions, small and shallow water bodies are more sensitive to changes in nutrient load, water flow, and human management. The four water bodies studied are small (area <0.01 km²), constantly supplied by a non-anthropogenic source of nutrients, and these water bodies present different trophic states: mesotrophic, eutrophic, and hyper...

Antecedentes y Objetivos: Las cianobacterias son algas procariontes oxifotótrofas presentes en gran variedad de hábitats y son componentes importantes de las comunidades bentónicas en muchos ambientes continentales y marinos. En México su diversidad en ríos es poco conocida; por ello, este estudio contribuye al conocimiento ficoflorístico en cinco...

Peters plus syndrome (MIM #261540 PTRPLS), characterized by defects in eye development, prominent forehead, hypertelorism, short stature, and brachydactyly, is caused by mutations in the β3-glucosyltransferase (B3GLCT) gene. Protein O-fucosyltransferase 2 (POFUT2) and B3GLCT work sequentially to add an O-linked Glucose β1-3Fucose disaccharide to pr...

The morphological and environmental characteristics of the genus Terpsinoë were assessed from five populations from tropical streams in central Mexico. Four populations of Terpsinoë musica were characterized by one eccentric rimoportula with a short stalk. Only one population was characterized by one to three eccentric rimoportulae. For the first t...

Beltrán-Magos, Y, J. Carmona, G. Vilaclara and M. Bojorge-García. 2013. Calcification of the filamentous cyanobacterium Blennothrix ganeshii in calcareous tropical streams of central Mexico region. Hidrobiológica 23 (1): XXX-XXX. ABSTRACT Geochemical, mineralogical and microbiological data from four freshwater streams in central region of Mexico in...