Gustavo Montejano

Gustavo Montejano
Universidad Nacional Autónoma de México | UNAM · Department of Comparative Biology

About

42
Publications
14,527
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
456
Citations

Publications

Publications (42)
Article
We analysed and characterized the cyanobacteria in microbialites of Alchichica crater lake over a depth gradient, from 3 to 30 m. A polyphasic approach was followed using morphometry, optical and epifluorescence microscopy, and molecular methods. Regions V3-V4 of the 16S rRNA conserved for cyanobacteria were amplified and used for clone library con...
Data
Relative abundance of taxa observed with microscopy, scale goes from very abundant (dark blue) to no observation (white color). The grey boxes indicate a positive signal for the different methods of identification. Cyanobacterial images were taken from microscopic analysis in this study except for the ones indicated with a * which will require a re...
Poster
Full-text available
Microbialites are microbial organic sedimentary structures formed either by mineral accretion, precipitation or binding. In this study we addressed described the cyanobacterial diversity associated with microbialites from crater-lake Alchichica (Puebla, Mexico), Bacalar lagoon (Quintana Roo, México) and Cenote Azul (a sinkhole within Bacalar lagoon...
Article
Full-text available
In drylands worldwide, biocrusts, topsoil microbial communities, are prevalent, contributing to the biostabilization of soils and allowing the subsequent establishment and growth of vascular plants. In early successional biocrusts, cyanobacteria are the first dominant colonizers of bare ground, largely determining their functioning. However, there...
Article
Full-text available
Gloeobacter violaceus is a simple unicellular cyanobacterium believed to be basal to all cyanobacteria. It is unique among the cyanobacteria in various features, but most significantly in the absence of thylakoids and a circadian clock. We found additional features which support the basal status of the clade of G. violaceus in samples from a wet wa...
Article
Full-text available
Twelve strains of Leptolyngbya-like filaments were isolated from biological soil crust samples from two localities in the Central Region of Mexico. The strains were morphologically distinguished from most Synechococcalean species by the obligate presence of a blackish sheath. Phylogenetic analysis based on 16S rRNA gene sequence placed all strains...
Article
The genus Nematoplaca has only been reported once, by Geitler & Ruttner from Indonesia, therefore it has been considered a rare genus. Its only described species is Nematoplaca incrustans Geitler. Bourrelly considered Nematoplaca synonymous with Desmosiphon because both have a nematoparenchymatous habit and pseudodichotomous branching. More than 30...
Article
Full-text available
The results of a phycofloristic study on three springs in the Huasteca Potosina region are presented; 67 species are reported. Floristic similarities and differences among the springsare analized, as well as the relationship between species and environmental factors. Microhabitas were defined in the springs as well as the principal algal asociation...
Article
Full-text available
The algal species present in the pools of the El Salto river, in the locality of the same name are reported. These pools appear when the river begins to dry up and are very similar to lentic habitats in water movement and growth forms of the algae. During the rainy season these pools are covered by the river, which causes a shift in the predominant...
Article
Full-text available
El presente trabajo describe la diversidad algal del manantial geotermal Los Hervideros, Michoacán, México, así como su distribución en relación con el gradiente de temperatura. Este manantial forma parte del sistema hidrotermal Los Azufres, localizado en el mismo estado, el cual es afectado por la actividad volcánica de la Faja Neovolcánica Transm...
Article
Full-text available
A distinctive morphotype consisting of an epilithic, one-layered colony of polarized, 1–3-celled pseudofilaments was recognized in the rocky shores of the state of Oaxaca in the Mexican tropical Pacific. Morphologically, it was not identifiable as any species of a previously described genus. It is similar to species from the former order Chroococca...
Article
Full-text available
Although neglected for a long time by freshwater-ecology research, springs are very important habitats for biodiversity conservation. They are multiple ecotones, and are characterized by a remarkable variety of environmental conditions (e.g., from highlyshaded to UV exposed, from permanent discharge to intermittent flow, from still water to strong...
Article
Full-text available
This paper is a contribution to the morphological and molecular characterization of the cyanobacterium Brasilonema robertilamii from populations found in Central Mexico. The general growth form and the morphological, morphometric and ecological characteristics of the populations studied clearly correspond to those described for Brasilonema roberti-...
Article
Full-text available
Introduction: The Mayan archaeological sites belong to the World cultural heritage. The porous nature of limestone and stucco (calcareous coating) along with the high humidity and temperature typical of Southern Mexico and Central America, make these monuments prone to stone biodeterioration. The Mayan masks and stelae of the North Acropolis Comple...
Data
Full-text available
New approaches in taxonomy and the introduction of molecular tools have substantially changed the taxonomy of cyanobacteria, leading to new genera and species being defined based on genetic and morphological investigations. In addition, molecular tools have confirmed several previously defined cyanobacteria genera, including some based on morpholog...
Article
Arid mangroves constitute a particular biotope, with very extreme variations in ecological conditions, mainly temperature and salinity, condition that demand specific adaptations to successfully inhabit this ecosystem. Cyanoprokaryotes have not been well studied in Mexican coasts and this is the first study that contributes to the knowledge of the...
Article
Full-text available
Since James Hutton established the principle of uniformitarism in 1788, direct comparisons between ancient and present processes have been key elements in geological and paleontological observations. Lyell and Darwin successfully applied uniformitarism using reasoning and inference to obtain the missing data from incomplete evidence (Gould, 1983)....
Article
Full-text available
Arid mangroves constitute a particular biotope, with very extreme variations in ecological conditions, mainly temperature and salinity, condition that demand specific adaptations to successfully inhabit this ecosystem. Cyanoprokaryotes have not been well studied in Mexican coasts and this is the first study that contributes to the knowledge of the...
Article
Full-text available
The life cycle of Asterocapsa divina Komárek 1993, an aerophytic chroococcal cyanoprokaryote described from calcareous rocks of the central region of Mexico, has been studied in natural populations and also in laboratory cultures. In the life cycle of the species two different phases could be recognized: one corresponding to the arthrocytous stage,...
Article
Full-text available
Cyanobacteria, mosses and lichens are the main components of biological soil crusts that cover extensive areas of cold and hot deserts. Approximately 50 species of cyanobacteria, 52 species of mosses and 34 species of lichens have been described from North American deserts. We collected samples of biological crusts from 87 sites in the rainshadow d...
Article
Full-text available
Blennothrix was proposed by Kützing in 1843, but it was suppressed in the taxonomic starting point of the group. However, Hydrocoleum species with discoid cells and with a special type of branching were transferred to Blennothrix, which was then revalidated. Its species occur in tropical and temperate regions of the world and can be found in saltwa...
Article
The morphology and phenology of Sirodotia huillensis was evaluated seasonally in a central Mexican first-order calcareous stream. Water temperature was constant (24–25°C) and pH circumneutral to alkaline (6.7–7.9), and calcium and sulfates were the dominant ions. The gametophyte stages were characterized by the presence of a distinctive mucilaginou...
Article
Full-text available
During the last 10 years nearly 280 taxa of cyanoprokaryotes belonging to 93 genera have been recorded for different biotopes of the central region of Mexico. These studies include a wide spectrum of biotopes, marine and continental. This richness of species is related to the variety of biotopes including marine inter and supratidal as well as spri...
Article
Full-text available
Knowledge of marine cyanoprokaryotes from México is scarce. Until recently, information is very limited, consisting of lists of species without descriptions or illustrations. In order to contribute to the survey of this biotopes in México, we present the detailed description of several populations of two common but previously unreported epilithic s...
Article
Full-text available
The distribution of species of Rhodophyta was investigated in 424 stream segments, sampled from 1981-1999 in three river basins from central Mexico. Red algae occurred in 12 % of the stream segments sampled, a low frequency compared to major surveys in other parts of the world (18-65 %). Sixteen species of freshwater red algae were found, of which...
Article
Full-text available
The little known genera of Hydrococcaceae Cyanodermatium, Placoma and Hydrococcus are well represented in the epilithic and epiphytic flora of central Mexico. A new marine species of Cyanodermatium, C. gonzaliensis, is established and three freshwater populations of the genera Hydrococcus, Cyanodermatium and Placoma, that represent new records for...
Article
Full-text available
In this paper we present a synthesis of several studies on the reproduction, life cyles and taxonomy of epiphytic baeocyte producing cyanoprokaryotes from central Mexico. We have found that thallus structure is closely related with the mechanism of reproduction (binary fission and/or multiple fission), planes of cell division during development and...
Article
Full-text available
The reproductive stages of Dermocarpella gardneri and D. stellata, which have been reported only once, are described. Formation of baeocytes occurs by cellular divisions that are parallel to the substratum, followed by a series of anticlinal radial divisions. In some cases in D. gardneri, the superior cell, resulting from the first division paralle...
Article
Full-text available
This work includes a taxonomic analysis, habitat descriptions and distribution of 23 populations of the genus Hildenbrandia, collected in 14 sities in Mexico and one in Central Europe. Twenty two populations from Mexico were considered as belonging to a single species (H. angolensis), characterized by having small cell diameter (mean 4.1 µm). The s...
Article
An account of the intricate history of the taxonomy and nomenclature of the genus Dermocarpella (Cyanobacteria / Cyanophyceae / Cyanoprokaryota) is provided. Detailed observations at the population level have allowed the detection of different stages of the life cycle of two species of this genus and have helped to solve some of the uncertainties i...
Article
This is the third study on the cyanoprokaryotic (cyanophycean, cyanobacterial) epiphytes, colonizing submersed substrates (mainly other filamentous algae) in streaming waters in central Mexico. The species of the genus StichosiphonGeitler 1932 were all made synonyms of S. sansibaricus by Drouet & Daily (1956). We have found six morphotypes, which c...
Article
Full-text available
130 distinct species of cyanoprokaryotes belonging to 50 genera were recorded from a variety of habitats in central Mexico, including streams, waterfalls, lakes and thermal springs. 35 (27%) of these taxa have been described earlier in standard determination manuals, 16 as tropical or subtropical, and 19 as cosmopolitan in distribution. However, 95...
Article
Second article of the series of studies about the cyanoprokaryotic (cyanophycean, cyanobacterial) species, growing epiphytically on submersed filamentous algae in central Mexico. The traditional genus Xenococcus was found to be heterogeneous and the stability and frequency of inter- and intrageneric characters was studied in natural populations fro...
Article
Three freshwater, epiphytic species of the cyanoprocaryotic (cyanophycean, cyanobacterial) genera Cyanocystis (C. mexicana spec. nova) and Xenococcus (X. willei GARDNER, X. bicudoi spec. nova), which occur commonly in streaming, unpolluted waters of central Mexico, were studied and documented. The generic diacritical features of Cyanocystis and Xen...

Network

Cited By

Projects

Project (1)
Project
Microbial ecology, Biodiversity and Conservation