Marcelo Silva-Briano

Autonomous University of Aguascalientes | UAA · Departamento de Biología

The elemental composition of biological structures in ostracods cultured under standard conditions is a biological reference material and a baseline to study bioaccumulation due to exposure to inorganic compounds in laboratory experiments or samples collected from the environment in ostracods. Ostracods are used as paleoclimatic, and paleo-evolutio...

Diapausing embryos encased within cladoceran ephippia result from sexual reproduction and increase genetic diversity. They are also important means by which species bypass harsh environmental conditions and disperse in space and time. Once released, ephippia usually sink to the benthos and remain there until hatching. Using the Sars’ method (incuba...

Mexican cladocerans diversity and distribution.

Biological samples obtained from a coastal system of northern Colombia yielded male and female specimens of an undescribed harpacticoid copepod of the diverse ameirid genus Nitokra Boeck, 1865. The new species is a member of the genus group III. We describe the new species based on adult male and female individuals. Nitokra puebloviejensis sp. nov....

Interaction between rotifers species with Aeolosoma hemprichi is poorly understood. Also their feeding habits and biological interaction. Therefore, the present study had as a main goal to perform observations on the in vitro feeding behavior. The organisms were cultured with a photoperiod of 16h of light and 8h of darkness at a temperature of 25ºC...

Se empezó un monocultivo a partir de una hembra partenogenética de la cepa Simocephalus mixtus imarpe sp. nov. IMP-BG-Z021 de la laguna Jitarayoc o Guitarra Yoc en la Región Ayacucho sobre 4600 msnm. Se evaluó el crecimiento diario de una muestra (n= 60) nacidos en un intervalo de 8 horas, el fitness fue alterado al medir los mismos individuos a lo...

Glyphosate levels and the transfer of glyphosate across trophic levels have rarely been studied in zooplankton. The food preferences of zebrafish during the first-feeding stage (which is critical for the survival of organisms), were analyzed because of the requirement for live food. Larval survival begins to be affected when glyphosate intake excee...

Understanding how local conditions and dispersal dynamics structure communities of passively dispersing aquatic invertebrates remains uncertain, especially in aridland systems. In these systems, dispersal is irregular and successful colonization is subject to priority effects. To investigate these factors, we compared rotifer species composition fr...

Two Peruvian strains of the genus Brachionus were isolated from impacted coastal wetlands. With an integrative taxonomic view, we described their taxonomic status, morphological characters, productive parameters, and phylogenetic position. In the case of both strains, the relationship between biometrics and productive parameters obtained with Princ...

Desert aquatic systems are widely separated, lack hydrologic connections, and are subject to drought. However, they provide unique settings to investigate distributional patterns of micrometazoans, including rotifers. Thus, to understand rotifer biodiversity we sampled 236 sites across an array of habitats including rock pools, springs, tanks, flow...

The study of zooplankton diversity through the analysis of the active community implicates repeated samplings at different sites of the lake, throughout different seasons and years. A valid cost-effective alternative for the analysis of zooplankton species richness is represented by the study of their diapausing propagules. This method allows retri...

The Brachionus plicatilis complex represents the most studied group of rotifers, although the systematics of the species complex has not been completely clarified. Many studies have been conducted trying to explore the diversity within the complex, leading to the recognition of three major morphotypes: large (L), small-medium (SM), and small (SS)....

Este libro, Biodiversidad de la Estación Biológica Agua Zarca, mues- tra el trabajo que han realizado los integrantes del Cuerpo Académi- co de Conservación de la Biodiversidad (clave uaa-ca-113), el cual pertenece al Departamento de Biología, del Centro de Ciencias Bási- cas de la Universidad Autónoma de Aguascalientes. Su contenido incluye la may...

Bromeliads (Bromeliaceae) are an extremely diverse family of the angiosperms widely distributed in the tropical and subtropical regions of the Americas and West Africa. They often serve as phytotelmata, accumulating rainwater between leaves. Such water reservoirs can be inhabited by diverse organisms. But to date not much attention is paid to inven...

Freshwater microcrustaceans are one of the most diverse and understudied groups of the animal kingdom and are best described by the use of an integrative taxonomic approach, including morphological, molecular and geographical data. In this study, we used three different types of characters, including detailed morphological analyses, DNA barcodes (C...

Megaloprepus caerulatus (Drury, 1782) is one of the largest damselfl ies in the world and it is recorded here for the fi rst time in Acomul, state of Hidalgo, Mexico, being this the northernmost record known in the American Continent, which allows us to discuss its current geographic distribution and its taxonomic status.

Megaloprepus caerulatus (Drury, 1782) es una de las libélulas más grandes en el mundo y se registra aquí por primeravez en Acomul, Hidalgo, México, siendo éste el registro más septentrional conocido en el Continente Americano, lo que permite discutir su distribución geográfica actual y su estatus taxonómico.

Antecedentes: Los parámetros fisicoquímicos y pruebas de toxicidad aguda sirven para valorar las condiciones del agua de los efluentes de las plantas de tratamiento de aguas residuales de acuerdo con la normativa de la NOM-003-SEMARNAT-1997. Objetivos: Conocer la calidad del agua del influente y efluente de la planta tratadora de aguas residuales...

We provide descriptions of the sexual reproductive biology of 12 species of rotifers from seven families and seven genera: Brachionus angularis, B. araceliae, B. ibericus, B. quadridentatus (Brachionidae); Cephalodella catellina (Notommatidae); Collotheca ornata (Collothecidae); Epiphanes brachionus (Epiphanidae), Filinia novaezealandiae (Trochosph...

Entamoeba histolytica invades the intestine and other organs during the pathogenesis of amoebiasis. In the early stages, the host organism responds with an inflammatory infiltrate composed mostly of neutrophils. It has been reported that these immune cells, activated by Entamoeba histolytica, exert a protective role by releasing proteolytic enzymes...

Trophi is only found in rotifers. The trophi has been used as a tool to identify species as well as an instrument for reconstructing the phylogeny of the organism, morphometric analysis, etc. Twelve species of rotifers of the genus Brachionus Pallas, 1766 were collected from different regions of the state of Aguascalientes, Mexico. An ultra-structu...

Based on the examination of specimens deposited in different national and international biological collections, we reviewed the ca. 800 records of the genus Eucyclops in Mexico and compared them with the type material of presumedly widespread species. Resulting from our taxonomical analysis, in this contribution we recognise 17 species dwelling in...

Vinclozolin (VZ) is a dicarboximide fungicide widely used on fruits, vegetables and wines, effective against fungi plagues. In this study we characterized the effects of VZ using a 4-day reproductive chronic assay with the freshwater rotifer Brachionus calyciflorus. The assay included observations of several features of asexual and sexual reproduct...

Most living organisms are exposed to nanomaterials. The renal effects of a single and intravenous dose (5 mg/kg) of titanium dioxide nanoparticles to male adult Wistar rats were obtained analyzing urine samples at 0-5 h, 5-24 h, 24-48 h and 48-72 h, giving as the earliest and significant (p < 0.05) effects: a) increase of the enzymatic activity of...

Objectives: To compare the distribution of chemical elements among the carious and normal enamel layers on teenagers, using energy dispersive X ray spectrometer (EDS Rx). Materials and Methods: The EDS Rx analyzer is integrated to scanner electron microscope. The macro and mi-croelements were made in 30 premolars of teenager: 14 carious enamel laye...

The study of sexual reproductive behavior supported by ultrastructural evidence is important in rotifers to describe differences among potential cryptic species. In this research, the morphology of the rotifer Brachionus bidentatus is described at the ultrastructural level, using electronic microscopy, together with a brief description and discussi...

The study of sexual reproductive behavior supported by ultrastructural evidence is important in rotifers to describe differences among potential cryptic species. In this research, the morphology of the rotifer Brachionus bidentatus is described at the ultrastructural level, using electronic microscopy, together with a brief description and discussi...

In the state of Aguascalientes, Mexico, we found a rotifer of the genus Brachionus, B. josefinae, belonging to urceolaris group. This endemic rotifer, has not yet been reported in any other region of Mexico or the America. For the first time since it was described, morphological features are displayed with images showing the ultrastructure of the h...

We present the first faunistic report on the Laotian Cladocera from diverse habitats in Vientiane province, Central Laos. We counted a total of 70 species, belonging to 37 genera, which is realistically close to an estimated 77 species. The five most common species were Diaphanosoma excisum, Ephemeroporus cf. barroisi, Anthalona harti, Macrothrix s...

A new species of the freshwater cyclopoid copepod genus Metacyclops Kiefer, 1927 is described from a single pond in northern Mexico, within the binational area known as the Chihuahuan Desert. This species belongs to a group of Metacyclops species with a 3443 spine formula of swimming legs. It is morphologically similar to Metacyclops lusitanus Lind...

RESUMEN Las agallas son estructuras de crecimiento anormal en los tejidos de las plantas debido a la actividad parasítica de otro organismo. El estudio de este tipo de estructuras como microhábitat de avispas es escaso en la literatura y no se presenta una descripción detallada de su conformación. En este traba-jo se describe la anatomía y morfolog...

Eight cladoceran species of Alona s. lato and related genera were found in Aguascalientes state, Mexico, after extensive sampling efforts. Two of them are new for science. Both new species belong to the pulchella-group of Alona and share distinctive features of the group. Alona aguascalientensis sp. nov. differs from the other species of the group...

We studied how lead is bioconcentrated and distributed in the rotifer Brachionus calyciflorus using metal histochemistry to locate lead granules, Leadmium Green® analysis to establish the route of uptake, atomic absorption to determined the bioconcentration factor (BCF), and detected the presence of microelements in the cuticle by X-ray microanalys...

The richness region for cladocerans in phytotelmata is México. Very few places has been record has phytotelmata habitat for Cladocera, 4 species have been found in mexican bromeliads.

The richness region for cladocerans in phytotelmata is México. Very few places has been record has phytotelmata habitat for Cladocera, 4 species have been found in mexican bromeliads.

The peritrich epibiotic ciliate Trichodina diaptomi Basson and Van As, 1991 was recorded on the body surface of two Neotropical species of the calanoid copepod genus Mastigodiaptomus in north-central Mexico. Specimens infested with the ciliate were collected from a pond near a large eutrophic reservoir. This ciliate was identified as T. diaptomi by...

The neuro-immune network, in which the vagus nerve is involved, provides feedback between its afferent branches for signalling central nervous system from sites of injury through cytokines and its efferent branches, which release acetylcholine, an anti-inflammatory neurotransmitter. For gain insight into the parasympathetic mechanisms participating...

The freshwater planktonic calanoid copepod Leptodiaptomus dodsoni Eli ́as-Gutie ́rrez, Sua ́rez-Morales & Romano, 1999, a rare species known only from western Mexico, is here recorded from the State of Aguascalientes, central Mexico. This species has a uniquely large, sinuous spine on segment 13 of the right male antennule, reaching the distal marg...

The harpacticoid copepod Balaenophilus manatorum (Ortíz, Lalana and Torres, 199216. Ortíz , M , Lalana , R and Torres-Fundora , O. 1992 . Un nuevo género y una nueva especie de copépodo Harpacticoida asociada al manatí Trichechus manatus en aguas cubanas . Rev Invest Marinas La Habana. , 13 : 117 – 127 . View all references) was originally describe...

Los pseudoescorpiones son un grupo de arácnidos diminutos que miden de 1 a 7 mm de longitud. Se tienen registrados cerca de 3000 especiesen el mundo, y en México se conocen aproximadamente 160. Ellos viven en cuevas, bajo la corteza de los troncos caídos, entre los musgos,hendiduras del suelo rocas y muros, jardines, y sobre animales que les sirven...

El cladócero exótico Daphnia Ctenodaphnia lumholtzi G. O. Sars, 1885, que tiene una distribución Afro-Australiana-Asiática fue encontrado en muestras de plancton obtenidas en la presa El Salto, Sinaloa, en el noroeste de México. Se presentan datos morfológicos de la población de D. lumholtzi hallada en México y se comparan con la población australi...

Daphnia curvirostris is a typical European species but has also been recorded in Canada and USA. This is a new record for Mexico and the taxon was collected from the Chimaliapan wetlands (State of Mexico, Mexico). Taxonomic descriptions of it are provided using both light and scanning-electron microscopes. When cultured on the green alga Scenedesmu...

Nancy F. Mercado-Salas, Eduardo Suárez-Morales, and Marcelo Silva-Briano (2009) Two new species of Acanthocyclops Kiefer, 1927 (Copepoda: Cyclopoida: Cyclopinae) with pilose caudal rami from semiarid areas of Mexico. Zoological Studies 48(3): 380-393. Two new species of the freshwater cyclopoid copepod genus Acanthocyclops Kiefer, 1927 are describe...

The Macrothrix rosea-triserialis group of species (Cladocera: Macrothricidae) is characterized by (1) a well developed postabdomen heel; (2) rows of strong spines on preanal margin of postabdomen and (3) scraper 5 of limb II with enlarged subapical teeth. Macrothrix agsensis, a member of this group, was recently described from the Mexican Central P...

The Macrothrix rosea-triserialis group of species (Cladocera: Macrothricidae) is characterized by (1) a well developed postabdomen heel; (2) rows of strong spines on preanal margin of postabdomen and (3) scraper 5 of limb II with enlarged subapical teeth. Macrothrix agsensis, a member of this group, was recently described from the Mexican Central P...

Syntaxin-1 and 25-kDa Synaptosome-associated Protein (SNAP-25) are present in the plasma membrane of several different secretory cell types and are involved in the exocytosis process. In this work, the free-living amoeba Difflugia corona was studied in relation to ultrastructure, structural membrane proteins, and proteins such as Syntaxin-1 and SNA...

This contribution describes a new species of Brachionus distinguished of the other species of the genus for the presence of two prominent posterior wing-like structures. These structures were previously recorded in Brachionus bidentatus Anderson 1899 var. ambidentatus De Ridder 1991. However, De Ridder assumed that these structures were induced by...

Autofluorescence in living cells is due to the presence of endogenous substances that emit fluorescence upon excitation by incidental light. A type of fluorescence, bioluminescence, has been suggested to be linked to mucus secretion in earthworms; however, the origin and the physiological function of this fluorescence are not clear. The aims of thi...

This contribution describes a new species of Brachionus distinguished of the other species of the genus for the presence of two prominent posterior wing-like structures. These structures were previously recorded in Brachionus bidentatus Anderson 1899 var. ambidentatus De Ridder 1991. However, De Ridder assumed that these structures were induced by...

A new species of AcanthocyclopsKiefer is described from central Mexico. It differs from its congeners by a combination of characters including mainly: 11–13 antennular segments, a spine formula of 3444 and modified setae on legs 2–4. The presence of a compound distal antennular segment is aberrant within the Cyclopoida. The new species seems to be...

This study examined important aspects of the sexual reproductive biology of the monogonont rotifer Brachionus quadridentatus Hermanns. Observations on the following was made: 1) Morphological description of the male, 2) An analysis of mating behavior, 3) An analysis of female and male life-span at 25ºC, and 4) Morphometric characterization of the t...

We observed different morphotypes of some species in the family Brachionidae from the seasonal plankton samples of Lake Xochimilco collected during 2002–2003. We measured the body length, width, and spine lengths (posterior and anterior spines) of Brachionus havanaensis, Keratella americana, K. cochlearis and K. tropica during the periods when the...