CARACTERISTICAS EUGLENA PDF

Recibido X Corregido VII Aceptado XII The phytoflagellates are a heterogeneous group of autotrophic, heterotrophic and mixothrophic flagellates of trophic importance in several ecosystems. As in the rest of Latin America, the phytoflagellates that occur in the Mexican Pacific coasts are virtually unknown except for a few records.

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Recibido X Corregido VII Aceptado XII The phytoflagellates are a heterogeneous group of autotrophic, heterotrophic and mixothrophic flagellates of trophic importance in several ecosystems. As in the rest of Latin America, the phytoflagellates that occur in the Mexican Pacific coasts are virtually unknown except for a few records.

Their study require complicated collection and analysis methods, a probable cause for the scarce knowledge of this group in tropical and subtropical areas. Material recently collected from various localities along the Mexican Pacific coasts was used to study phytoflagellates, including toxic and potentially toxic species.

Plankton samples were treated by gravity and pump filtration, using different methods for fixation and analysis. The phyla Euglenophyta, Heterokontophyta and Haptophyta were found. They occur as plankton in oceanic and shallow coastal waters. Key words: Phytoflagellates, toxic, harmful species, Mexican Pacific. Throndsen , , Moestrup , Cox , Hoek et a l. Angel; Huatulco; Salina Cruz y Pto. Ya con los cultivos en desarrollo se realizaron aislamientos de organismos con micropipetas ver Throndsen , Hamilton y Lee para mayor detalle resembrando repetidamente para tratar de obtener cultivos unialgales.

Hasta el momento dentro de este grupo se tiene registrada solamente a E. Esta especie junto con otras, aunque no se le conoce toxina alguna, produce abundantes proliferaciones que perjudican la industria pesquera y el turismo, entre otros Villarino et a l.

Es necesario resaltar que las rafidoficeas se deforman y explotan cuando son fijadas. Se conocen cinco especies C. Una de ellas H. Presentan numerosos cloroplastos y observados en vivo su citoplasma simula ser como una esponja con gran cantidad de cloroplastos.

Las formas desnudas han sido asociadas a eventos de toxicidad Moestrup y Thomsen Moestrup menciona que pueden ocurrir falsas identificaciones cuando se encuentran en el plancton.

Las especies que han sido vinculadas con mortandades de peces son: D. Son microalgas marinas, unicelulares, y con dos flagelos en alguna etapa de su ciclo de vida. Es notable en algunas especies el desarrollo de floraciones masivas p. Globosa Scherffel Chretiennot-Dinet et al. Stabel et a l. Aunado a lo anterior tenemos una gran cantidad de especies que han sido transportadas en las aguas de lastre de los barcos. Hallegraeff y Bolch , Hallegraeff , Hallegraeff Se registran aquellas especies presentes o con posibilidad de estarlo que son potencialmente nocivas para el ecosistema marino pertenecientes a los Phyla Euglenophyta, Heterokontophyta y Haptophyta.

Alveal, K. Ferrario, E. Sar eds. Sar, M. Floraciones Algales Nocivas en el Cono Suramericano. Alveal, M. Nanoplankton species predominant in the subartic Pacific in May and June Deep-Sea Res.

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Phylogenetic reconstructions of the Haptophyta inferred from 18S ribosomal DNA sequences and available morphological data. Phycologia Identifying Harmful Marine Dinoflagellate s. Smithsonian Contributions. Culture methods, pp. Hallegraeff, D. Cembella eds. Manual of harmful microalgae. Potentially harmful microalgae of the western Indian Ocean: A guide based on a preliminary survey. Manuals and Guides. Seasonal study of phytoplankton pigments and species at a coastal station off Sidney: importance of diatoms an the nannoplankton.

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Plankton Res. Taxonomy of harmful marine raphidophytes, pp. Manual on Harmful Marine Microalgae. Sterilization, pp. Stein ed. Handbook of phycological methods: culture methods and grow measurements. Cambridge University Press. A broad spectrum artificial seawater medium for coastal and open ocean phytoplankton. Autoecology, life history and toxicology of the silicoflagellate Dictyocha speculum Silicoflagellata, Dictyochophyceae. Planktonic silicoflagellates Dictyochophyceae from the Mexican Pacific.

Coccolithophorids from the west coast of Baja California, Mexico. Hydrobiologia Jahns eds. Algae: an introduction to phycology. Cambridge University, Cambridge, Inglaterra.

Harmful algal blooms, 9 th Conference, Tasmania. Introduction to marine phytoplankton and their pigment signatures, pp. Jeffrey, R. Wright eds. Phytoplankton Pigments in Oceanography. A new method for fixation of unmineralized Haptophytes for TEM whole mount investigations. Selvin, W. Media for the culture of oceanic ultra-phytoplankton. General techniques for the isolation and culture of marine protists from estuarine, littoral, psammolittoral and sublittoral waters, pp. Lee ed.

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Euglenophyceae

Varias especies habitan en aguas salobres y estuarios y unos pocos linajes forman parte del plancton marino. Viven en los sedimentos o nadando en la columna de agua. Normalmente el flagelo emergente presenta una fila de mastigonemas. Puede aparecer un estigma o mancha ocular , con un fotorreceptor sensible a luz. Cuando las condiciones no son favorables se enquistan y germinan cuando vuelven a serlo.

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Exploring the glycans of Euglena gracilis. Previous work has shown that Euglena expresses a wide range of carbohydrate-active enzymes, Given the prospects for using Euglena algae as part of the biological systems of human life support in long-term space flights, we studied the effects of low doses of radiation and genotype influence on the radiosensitivity of Euglena cells. Its chloroplastless derivate OFL strain shows increased radiosensitivity. The E. Irradiation up to 10 Gy had the hormesis effect on the initial strains, and it is only above Gy that cell death was observed.

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