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| Registros recuperados: 38 | |
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| Cruz, M.; Tapia, M.E.; Naranjo, Ch.. |
| Con la finalidad de determinar la influencia del evento El Niño 2009-2010 que se dsarrolló en elas regiones Niño 1+2 y 3.4, en base a los organismos indicadores de masas de aguas para determinar la intensidad y efectos en la costa ecuatoriana, se utilizaron cinco grupos de organismos planctónicos: Diatomeas, Dinoflagelados, Quetognatos, Pterópodos, Heterópodos y las concentraciones de clorofila a antes, durante y después del evento El Niño 2009-2010. En el primer trimestre del 2009 se registró una alta producción primaria, mientras que desde septiembre a noviembre se observó la más baja productividad del mar, en las estaciones fijas La Libertad como en Manta.En la estación fija de La Libertad, durante todo el 2009 predominaron especies de fitoplancton que... |
| Tipo: Journal Contribution |
Palavras-chave: Phytoplankton; Zooplankton; Indicator species; Diatoms; Primary production; El Nino phenomena; Water masses. |
| Ano: 2010 |
URL: http://hdl.handle.net/1834/4213 |
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| Incorvaia, I.S.. |
| Parasites nematodes as biological tags of Macruronus magellanicus (longtail hake) and Merluccius hubbsi (hake) colleted between 34°- 55°S in the SW Atlantic were studied. Adult specimens of Hysterothylacium aduncum, Ascarophis marina and Ichthytofilaria argentinensis, and the third-stage specimens of H. aduncum, Anisakis simplex and Contracaecum aduncum were described. Histological studies showed that I. argentinensis provokes tissue reactions in the swim bladder of M. hubbsi. A wide distributional range of species can be represented by many fish populations or fishing stocks. As these can overlap in space, the proper identification of stocks is necessary for fisheries management. The parasitologic method is one currently used to determine stocks.... |
| Tipo: Theses and Dissertations |
Palavras-chave: Stock identification; Parasites; Indicator species; Abundance; Histology; Marine fish. |
| Ano: 2002 |
URL: http://hdl.handle.net/1834/5030 |
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| Mahmoudi, E.; Beyrem, H.; Boufahja, F.; Essid, N.; Hedfi, A.; Aissa, P.. |
| Dix stations côtières ont été prospectées dans la lagune de Bizerte en hiver 2001 pour étudier l’impact des conditions environnementales sur les plans morphométrique, trophique et de maturité des nématodes méiobenthiques. Nos résultats montrent que la croissance en largeur des nématodes libres a été proportionnelle aux charges sédimentaires en fraction fine et en métaux et ce parallèlement à l’individualisation de quatre morphotypes nématologiques. D’autre part, la structure trophique de la nématofaune est liée à la turbidité et aux concentrations des eaux en nitrites. En effet, la proportion en détritivores sélectifs, principalement bactériophages, au sein des communautés nématologiques, est positivement corrélée à la concentration des eaux en nitrites et... |
| Tipo: Journal Contribution |
Palavras-chave: Environmental effects; Feed composition; Indicator species; Pollution monitoring; Sedimentation; Sexual maturity; Turbidity; Nematoda; Environmental impact; Http://aims.fao.org/aos/agrovoc/c_5112; Http://aims.fao.org/aos/agrovoc/c_24420. |
| Ano: 2006 |
URL: http://hdl.handle.net/1834/4156 |
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| Virgilio, Lucena Rocha; Ramalho, Werther Pereira; Silva, João Carlos Barbosa da Silva; Suçuarana, Monik da Silveira; Brito, Cleyton Holanda de; Vieira, Lisandro Juno Soares. |
| The degradation of riparian vegetation in low-order streams can cause irreversible environmental damage, biodiversity loss and alter the structure of communities. In this context, the present study evaluated how the level of degradation of riparian vegetation influences the fish assemblage in three low-order streams in the Brazilian Amazon. In each stream, three different stretches were delimited, distributed in the environments of forest, edge and pasture, and the samplings were conducted in three hydrological regimes using dip nets. Influences of the stretches and streams on richness and abundance were tested with GLMM, on the composition with PERMANOVA and on indicator species with IndVal. Species richness was higher in forest environments and lower in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Low-order streams; Environmental alteration; Diversity loss; Fish diversity; Indicator species; Pasture.. |
| Ano: 2018 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/42562 |
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| Registros recuperados: 38 | |
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