Genoveva Esteban
Bournemouth University, School of Applied Sciences, Department Member
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Research Interests: Biology, Medicine, Methods, Pubmed, Animals, and 5 moreBioassay, Microbiologia, Protozoa, Ciliophora, and Biological Assay
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The roles of exaptation, gene loss and gene transfer in the evolution of ciliate hydrogenosomes
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The question as stated by the chapter heading is not trivial. Many standard textbooks define protozoa as “unicellular animals”, but this is not satisfactory. The idea that protozoa are unicellular in the sense that they correspond to a... more
The question as stated by the chapter heading is not trivial. Many standard textbooks define protozoa as “unicellular animals”, but this is not satisfactory. The idea that protozoa are unicellular in the sense that they correspond to a single cell of a multicellular organism was first conceived about 200 years after their discovery by Leeuwenhoek in 1674. The term “Protozoa” was coined by Goldfuss in 1817 to mean “original animals” and he included the coelenterates.
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Environmental education (EE) applications can support wildlife conservation practices by improving school children’s understanding of environmental issues, including endangered species conservation, such as the African savanna elephant... more
Environmental education (EE) applications can support wildlife conservation practices by improving school children’s understanding of environmental issues, including endangered species conservation, such as the African savanna elephant (Loxodonta africana). This study aimed to identify and assess school children’s perceptions of elephant conservation in three schools: South Africa, Kenya, and England. Questionnaires were completed by students at one school per location, with the age range of 10–16 (n = 364). The responses were then analysed independently and collectively using descriptive statistics (n = 364). School children feared elephants where elephants were native. The importance of elephants was not acknowledged by students in South Africa and England and included a lack of awareness of how elephants benefit other species. There was an unclear understanding of the threats to elephants. Collectively, a wildlife guide as a career choice was not highly valued. The results of thi...
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LA PRESENTE INVESTIGACION COMBINA LOS ESTUDIOS REALIZADOS EN LA ESTACION DEPURADORA DE AGUAS RESIDUALES, CON LOS BIOENSAYOS DE TOXICIDAD EN LABORATORIO. PUESTO QUE LOS PROTOZOOS CILIADOS PUEDEN SER UTILIZADOS PARA VALORAR LA CONTAMINACION... more
LA PRESENTE INVESTIGACION COMBINA LOS ESTUDIOS REALIZADOS EN LA ESTACION DEPURADORA DE AGUAS RESIDUALES, CON LOS BIOENSAYOS DE TOXICIDAD EN LABORATORIO. PUESTO QUE LOS PROTOZOOS CILIADOS PUEDEN SER UTILIZADOS PARA VALORAR LA CONTAMINACION AMBIENTAL Y SON INDICADORES DE LAS CARACTERISTICAS FISICO-QUIMICAS DEL ECOSISTEMA DONDE VIVEN, SE ELIGIO EL ESTUDIO DE UNA PLANTA DEPURADORA POR CONSTITUIR UNO DE LOS AMBIENTES MAS LIMITANTES QUE EXISTEN PARA EL CORRECTO DESARROLLO DEL CICLO BIOLOGICO DE LOS CILIADOS DEBIDO A LA ELEVADA CONCENTRACION DE MATERIA ORGANICA Y LA PRESENCIA DE RESIDUOS POTENCIALMENTE TOXICOS EN ESTAS AGUAS. POR CONSIGUIENTE, SE LLEVO A CABO EL ESTUDIO DE LA RELACION ENTRE LA ESTRUCTURA DE LA COMUNIDAD DE CILIADOS Y SU DENSIDAD DE POBLACION, CON EL FUNCIONAMIENTO DEL SISTEMA DE DEPURACION. ASIMISMO, PARA TENER UN AMPLIO CONOCIMIENTO DEL PROCESO DEL TRATAMIENTO BIOLOGICO DEL AGUA RESIDUAL EN RELACION CON LA DENSIDAD Y ESPECIES DE CILIADOS Y OBTENER LAS POSIBLES CAUSAS DE V...
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The genus Pseudoblepharisma is currently comprised of only one species, P. tenue, and one variant, P. tenue var. viride, both described as free-living ciliates thriving in oxygen depleted freshwater habitats of Europe. Here we report on... more
The genus Pseudoblepharisma is currently comprised of only one species, P. tenue, and one variant, P. tenue var. viride, both described as free-living ciliates thriving in oxygen depleted freshwater habitats of Europe. Here we report on this genus being discovered from subtropical freshwaters of Florida, USA. The Florida strain diverges from the P. tenue by being much larger, as well as having a far higher density of intracellular symbiotic green algae, resembling P. tenue var. viride. Unlike its European counterparts, the North American strain was observed to build a lorica, likely useful for protection and feeding; this has not been previously described for this genus. In contrast to P. tenue, the Florida strain does not have endosymbiotic purple bacteria. Despite large distances between sampling zones, the species is a close match at a morphological level to Pseudoblepharisma tenue var. viride. We provide the first 18S rRNA gene sequence for this species, allowing future investig...
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RESUMEN Las actividades asociadas a la agricultura intensiva, y principalmente el uso de agroquimicos, son la causa principal de alteracion y perdida de biodiversidad en los humedales. Los protozoos , por sus requerimientos y sensibilidad... more
RESUMEN Las actividades asociadas a la agricultura intensiva, y principalmente el uso de agroquimicos, son la causa principal de alteracion y perdida de biodiversidad en los humedales. Los protozoos , por sus requerimientos y sensibilidad a los contaminantes, son muy utiles como indicadores biologicos en sistemas acuaticos. Ademas, la existencia de un banco de semillas de la comunidad protozoaria en los sedimentos, la denominada diversidad criptica, asegura que estos microorganismos puedan emerger y realizar su papel despues de la mencionada alteracion. En este estudio se presentan los resultados preliminares de los efectos toxicos generados por un fertilizante, el nitrato amonico, sobre las tasas de emergencia de los protozoos enquistados o inactivos del banco de semillas. Esta evaluacion se ha llevado a cabo mediante la simulacion de sistema acuatico artificial alterado y la evaluacion de las tasas y patrones de emergencia de organismos presentes en el sedimento siguiendo diferent...
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Freshwater cyanobacteria blooms represent a risk to ecological and human health through induction of anoxia and release of potent toxins; both conditions require water management to mitigate risks. Many cyanobacteria taxa may produce... more
Freshwater cyanobacteria blooms represent a risk to ecological and human health through induction of anoxia and release of potent toxins; both conditions require water management to mitigate risks. Many cyanobacteria taxa may produce microcystins, a group of toxic cyclic heptapeptides. Understanding the relationships between the abiotic drivers of microcystins and their occurrence would assist in the implementation of targeted, cost-effective solutions to maintain safe drinking and recreational waters. Cyanobacteria and microcystins were measured by flow cytometry and liquid chromatography coupled to tandem mass spectrometry in two interconnected reservoirs varying in age and management regimes, in southern Britain over a 12-month period. Microcystins were detected in both reservoirs, with significantly higher concentrations in the southern lake (maximum concentration >7 µg L−1). Elevated microcystin concentrations were not positively correlated with numbers of cyanobacterial cel...
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Many anaerobic ciliated protozoa contain organelles of mitochondrial ancestry called hydrogenosomes. These organelles generate molecular hydrogen that is consumed by methanogenic Archaea, living in endosymbiosis within many of these... more
Many anaerobic ciliated protozoa contain organelles of mitochondrial ancestry called hydrogenosomes. These organelles generate molecular hydrogen that is consumed by methanogenic Archaea, living in endosymbiosis within many of these ciliates. Here we describe a new species of anaerobic ciliate, n. sp., by using silver impregnation and microscopy to conduct a detailed morphometric analysis. Comparisons with previously published morphological data for this species, as well as the closely related species, , demonstrated that despite them being similar, both the mean cell size and the mean number of somatic kineties are lower for than for , which suggests that they are distinct species. This was also supported by analysis of the 18S rRNA genes from these ciliates, the sequences of which are 97.5% identical (6 substitutions, 1479 compared bases), and in phylogenetic analyses these sequences grouped with other 18S rRNA genes sequenced from previous isolates of the same respective species....
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... Loxodes rex would, because of its very large size (2mm long), fragility, and lack of cyst formation, have been a prime candidate for an endemic ciliate, but it is not and it seems to thrive in tropical freshwater habitats on different... more
... Loxodes rex would, because of its very large size (2mm long), fragility, and lack of cyst formation, have been a prime candidate for an endemic ciliate, but it is not and it seems to thrive in tropical freshwater habitats on different continents (Esteban et al., 2001). ...