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| Registros recuperados: 584 | |
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| Iannacone,José. |
| Se realizó una investigación cuantitativa de la fauna parasitaria del anfibio Atelopus bomolochus Peters 1973 (Bufonidae). treintaytres especímenes fueron colectados manualmente de las inmediaciones del río Seco (80° 9'22'' LW, 5° 5'19'' LS), en las cercanías de la localidad de Chulucanas, provincia de Morropón, departamento de Piura, Perú en octubre del 2000. En total se colectaron 7 especies y 13.268 especímenes. Veintyocho hospederos estuvieron parasitados (84,8 %). Trece hospederos (39,4 %) mostraron infección con 1 especie de parásito, seis (18,2 %), ocho (24,2 %) y uno (3,0 %) tuvieron 2, 3 y 4 especies de parásitos, respectivamente. Se encontraron siete especies de parásitos con las siguientes prevalencias de infección: Gorgoderina parvicava... |
| Tipo: Journal article |
Palavras-chave: Acantocephala; Atelopus bomolochus; Anura; Cestoda; Helmintos; Nematoda. |
| Ano: 2003 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382003000100002 |
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| Valenzuela,Ariel; Alveal,Katherine; Tarifeño,Eduardo. |
| En peces, para el control homeostático, se necesita un adecuado suministro de oxígeno desde el medio acuático hasta los sitios de metabolismo aeróbico. Muchos peces están bien adaptados para soportar condiciones hipoxicas en su ambiente por ajustes respiratorios y cardiovasculares. Sin embargo no existe suficiente información sobre la respuesta homeostática de parámetros sanguíneos a hipoxia aguda. En los peces de cultivo es común que ellos sean expuestos a cortos periodos de hipoxia o anoxia a causa de fallas en las rutinas de manejo. Se determinó hematocrito, hemoglobina, recuento de eritrocitos, tamaño de los eritrocitos y cantidad de hemoglobina por eritrocito en truchas (Oncorhynchus mikyss) llevadas a hipoxia progresiva por mantención de los peces en... |
| Tipo: Journal article |
Palavras-chave: Hipoxia; Respiración; Bazo; Hematología; Truchas. |
| Ano: 2002 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382002000200024 |
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| Caruso,Michael J; Beardsley,Robert C; Gawarkiewicz,Glen G. |
| The interannual variability of the Kuroshio Current intrusion into the South China Sea is investigated using a combination of satellite remote sensing data and in situ measurements. This research was conducted as part of the Asian Seas International Acoustic EXperiment (ASIAEX). The circulation of the South China Sea has been studied for years and is predominantly wind-forced by the northeast winter and southwest summer monsoons. There remains some uncertainty to the interannual nature of the circulation and the effect of Kuroshio intrusions on mesoscale features in the northeast South China Sea. Satellite observations of Sea Surface Temperature (SST) from the Tropical Rainfall Measuring Mission (TRMM) and Sea Surface Height Anomalies (SSHA) from... |
| Tipo: Journal article |
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| Ano: 2004 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200017 |
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| Matear,Richard. |
| Global warming projections using a range of climate models included in the IPCC 4th assessment report (AR4) suggest the oceans will warm, the stratification of the upper ocean will increase and the ventilation of the ocean interior will change. These physical changes will impact dissolved oxygen levels in the ocean. Using a global warming projection from the CSIRO (Australian Commonwealth Scientific and Research Administration) climate model linked to a simple ocean biogeochemical model I investigated how dissolved oxygen levels in the ocean interior change under global warming. The climate simulations project the low oxygen regions like the eastern equatorial Pacific will expand. By the end of the century it is projected that the volume of hypoxic water... |
| Tipo: Journal article |
Palavras-chave: Global warming; Oxygen changes; Anoxia; Biogeochemical cycles; Climate change. |
| Ano: 2006 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382006000300010 |
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| Mitnik,Maia L.; Mitnik,Leonid M.. |
| A direct radiative transfer model, 478 radiosondes complimented by the cloud liquid water content profiles and the underlying surface temperatures and emissivities were used to simulate the brightness temperatures T Bs over the Marginal Ice Zone at ADEOS-II AMSR and Aqua AMSR-E frequencies. The precipitable water V varied from 0.63 to 18.5kg/m², the total cloud liquid water content Q<=0.25kg/m² and SST£1°C. The mean experimental values of emissivity and its fluctuations for several types of the first-year ice at ice temperature of 263 to 271K were used in a model. The sea surface emissivity was computed taking into account wind action. 10 values of ice concentration C uniformly distributed from 0.0 to 1.0 were selected for each radiosonde. The... |
| Tipo: Journal article |
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| Ano: 2004 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000300015 |
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| Cursach,Jaime A; Rau,Jaime R; Ojeda,Jaime; Vilugrón,Jonathan; Tobar,Claudio; Oyarzún,Carlos; Soto,Oscar; Suazo,Cristián G. |
| Entre los años 2007 y 2009, se estudió la diversidad de aves y mamíferos marinos que habitan bahía San Pedro (comuna de Purranque, provincia de Osorno). Evaluamos la composición, diversidad y abundancia de estos vertebrados, que presentó 18 especies de aves marinas, de las cuales Spheniscus magellanicus y Puffinus griseus fueron las más abundantes. Dos especies de pingüinos, una gaviota y un gaviotín se reproducen en la bahía. El ensamble de mamíferos marinos estuvo compuesto por siete especies, de las cuales Otaria flavescens y Lagenorhynchus australis fueron las más abundantes. Una especie de lobo marino y nutria de mar se reproducen en la bahía. Los resultados demuestran el potencial que posee esta bahía para la conservación de biodiversidad marina y el... |
| Tipo: Journal article |
Palavras-chave: Conservación; Huilliche; Manejo costero; Turismo; Vertebrados marinos. |
| Ano: 2011 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382011000200003 |
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| Rodríguez,Laura; Castro,Leonardo. |
| This is a review on some biological and ecological characteristics of the early life stages of myctophids that exemplify their adaptations to coastal upwelling zones and oceanic nearby areas. The approach has been, however, not to make an exhaustive list of all possible research subjects but, in a more pragmatic way, a) to identify relevant aspects that can be approached with currently available methods in the region and, b) through examples of studies published nationally and regionally, to stimulate future research in larval ecology in the Humboldt Current. Three major themes were assessed: taxonomy and systematics, population ecology and reproductive strategies and, ecophysiology of the early life stages. Among the former, we detected a lack of... |
| Tipo: Journal article |
Palavras-chave: Ichthyoplankton; Myctophids; Humboldt Current; Upwelling areas. |
| Ano: 2000 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382000000200011 |
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| Lara,Gladys; Parada,Esperanza. |
| El propósito del presente estudio fue comprobar si han ocurrido cambios, después de 16 años, en los patrones de abundancia, distribución espacial y estructura de talla de la almeja de agua dulce Diplodon chilensis en sustratos arenosos y areno-pedregosos del sector Chauquén del Lago Panguipulli. Los resultados indican que las almejas en 1987 y 2003 presentan una distribución espacial agregada en ambos sustratos y con una mayor fuerza de la agregación en los sustratos areno-pedregosos que arenosos. La densidad fue significativamente mayor en sustrato areno-pedregoso, tanto en 1987 (P < 0,001) como en el 2003 (0,001< P < 0,01). No se presentaron diferencias significativas (P > 0,05) en densidad entre los distintos años dentro de un mismo tipo de... |
| Tipo: Journal article |
Palavras-chave: Almeja de agua dulce; Diplodon chilensis; Distribución; Abundancia; Evaluación ecológica. |
| Ano: 2008 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382008000100007 |
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| Victoriano,Pedro F; Vera,Iván; Olmos,Viviana; Dib,Mariem; Insunza,Bárbara; Muñoz-Ramírez,Carlos; Montoya,Rolando; Jara,Alfonso; Habit,Evelyn. |
| Estudiamos los niveles y patrones de variabilidad genética de ocho especies de peces nativos de la cuenca del río San Pedro (cuenca del río Valdivia, Región de los Ríos, Chile), con el objetivo de evaluar diferencias microevolutivas en especies sometidas a similares condiciones ecológicas e históricas. Las especies consideradas fueron: Diplomystes camposensis, Percilia gillissi, Galaxias platei, G. maculatus, Basilichthys australis, Percichthys trucha, Aplochiton taeniatus y A. zebra. Para ello comparamos indicadores de diversidad genética tanto intra como inter-zonas, e indicadores de estructuración, basados en secuencias de la región de control, para diferentes tramos a lo largo del desarrollo del río. También recuperamos relaciones de parentesco entre... |
| Tipo: Journal article |
Palavras-chave: Peces nativos; Variabilidad genética; Conservación genética; Chile; Glaciaciones.. |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382012000100007 |
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| Salamanca,Marco A.; Camaño,Andrés; Jara,Bibiana; Rodríguez,Tatiana. |
| An extensive spatial survey metal content to study the spatial distribution of Cu, Pb and Zn concentration in nearshore waters of San Jorge Bay, along the coast of Antofagasta City, Chile was carried out located near the Atacama desert, which represent the largest populated urban settlement in northern Chile (~ 260,000 inhabitants). The coastal zone of this area is under an intensive use as discharge location of pollutants of different sources. Dissolved Cu varies between 0.97 to 1.65 mug l-1, in the southern part of the study area and in front of an industrial discharge, respectively. The dissolved Pb shows a narrow concentration range (0.019 to 0.029 mug l-1) and Zn content varies between 1.7 mug l-1 in the northern part of the study area to 2.0 mug l-1,... |
| Tipo: Journal article |
Palavras-chave: Trace metal distribution; Coastal waters; Desert areas. |
| Ano: 2000 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382000000200009 |
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| Chiang,Gustavo; Munkittrick,Kelly R; McMaster,Mark E; Tucca,Felipe; Saavedra,M. Fernanda; Ancalaf,Andrea; Gavilán,Juan F; Unzueta,Luis; Barra,Ricardo. |
| There is scarce basic biological data on native freshwater fish species from Chile and next to zero on growth, gonad development and reproduction, which are critical for the purposes of the conservation of their natural populations. Seasonal analysis of sub-individual (oocyte development) and population (length frequency, growth rates) endpoints in Trichomycterus areolatus and Percilia gillissi were evaluated from February 2007 to January 2008. Oocyte development has a marked seasonality for P. gillissi, with mature eggs in October and declining frequency of mature oocytes into January. For T. areolatus we found some mature eggs in July, with highest number of mature eggs in October, coincident with previous data on maximum gonad size. Both species showed... |
| Tipo: Journal article |
Palavras-chave: Seasonal cycles; Native fish Chile; Oocyte development; Multiple spawning reproductive strategy; Population size-structure. |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382012000300006 |
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| ESCOBAR HUERTA,GUSTAVO; SANTIBÁÑEZ TORO,JESSICA; ORTIZ,JUAN CARLOS. |
| This study describes a new species of lizard of the genus Liolaemus (L. lonquimayensis), without precloacal pores, associated with the lava flows of the Lonquimay volcano in the Región de la Araucanía, Chile. This species belongs to the elongatus clade, and is a sister lineage of L. elongatus. L. lonquimayensis differs from its sister species, L. elongatus, in the total absence of precloacal pores, smaller maximum SVL (69.7 mm in L. lonquimayensis and 91.0 mm in L. elongatus), greater number of midline scales (88 in L. lonquimayensis and 77 in L. elongatus), body color light grey to black in L. lonquimayensis and light to dark brown in L. elongates. L. lonquimayensis has an black occipital band formed by small black lines arranged horizontally flanked by... |
| Tipo: Journal article |
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| Ano: 2015 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382015000100009 |
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| Barstow,Steve; Mørk,Gunnar; Lønseth,Lasse; Schjølberg,Peter. |
| The demand for reliable information on wave conditions, in particular at coastal sites, is increasing. WorldWaves is a newly completed software package, developed by Fugro OCEANOR with funding from industry and within the framework of various European Commission sponsored contracts, notably EnviWave. The system simplifies the modelling of wave conditions in coastal waters, resulting in more timely, lower cost but reliable data. Thus, WorldWaves should be particularly beneficial in developing countries. In WorldWaves, the following are integrated under a single Matlab toolbox: · High quality long-term wave data offshore all global coasts. · Global bathymetric and coastline data. · Two shallow water wave models: SWAN, a third generation wave model and a... |
| Tipo: Journal article |
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| Ano: 2004 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-65382004000200007 |
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| Registros recuperados: 584 | |
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