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| Registros recuperados: 845 | |
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| HENRÍQUEZ,JUAN M.. |
| Los escasos trabajos de interacción planta-herbívoro en ambientes severos han concluido que los herbívoros tienen un rol menor sobre el proceso de colonización en los estados tempranos de la sucesión. Aquí se documentan los efectos de defecaderos de un herbívoro ungulado (Lamma guanicoe) sobre los patrones vegetales en una intermorrena glacial reciente. Se evaluó la composición florística, frecuencia y síndrome de dispersión de las especies presentes sobre los defecaderos y sitios control. Parámetros de suelo fueron analizados en ambos substratos. La riqueza y diversidad de especies vasculares fueron significativamente mayores sobre los defecaderos. El síndrome de dispersión dominante es la anemocoría en la vegetación de ambos tipos de substratos. Los... |
| Tipo: Journal article |
Palavras-chave: Defecaderos; Endozoocoría; Lamma guanicoe; Sucesión primaria. |
| Ano: 2004 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2004000300009 |
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| CORTES,ARTURO; ROSENMANN,MARIO; BOZINOVIC,FRANCISCO. |
| Chinchilla lanigera, es un roedor endémico de Chile que habita áreas desérticas del norte de Chile. Postulamos que C. lanigera (silvestre) por habitar en ambientes con escasa disponibilidad de alimento y agua, debiera poseer atributos fisiológicos que minimicen los requerimientos (costos) de energía y agua. Se evaluó el metabolismo energético en atmósferas de aire y He-O2, la pérdida de agua por evaporación (EWL) y temperatura corporal (Tb) a diferentes temperaturas ambientales (Ta). Los resultados más relevantes muestran que la tasa metabólica basal (BMR) fue 0,66 mlO2/g h y la conductancia térmica (C) de 0,0376 mlO2/g h°C; valores que corresponden al 80,4% y 72,5% de la magnitud predicha para un mamífero euterio de similar tamaño corporal,... |
| Tipo: Journal article |
Palavras-chave: Chinchilla lanigera; Metabolismo basal; Conductancia térmica; Pérdida de agua por evaporación. |
| Ano: 2000 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000200010 |
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| DUARTE,CRISTIAN; JARAMILLO,EDUARDO; CONTRERAS,HERALDO; FIGUEROA,LUIS. |
| The mytilid mussel Mytilus chilensis (Hupe) can form dense beds in sedimentary areas of the inland coast of the Nord-Patagonic archipelagos of the Chilean coast (ca. 40-43° S). During the autumn of 2002, we collected replicated samples at five intertidal stations in Panitao (Golfo de Reloncaví) ordered along a transect parallel to the low tide level and extended from the center of the bank (stations one and two with 100 and ca. 25 % of mussel cover, respectively) to the bare sediments of the intertidal (stations 3, 4 and 5, without mussels). The macroinfauna was numerically dominated by Polychaeta, Oligochaeta and Crustacea Peracarida. The total number of species collected was 14, being the most abundant the polychaete Perinereis vallata, oligochaetes from... |
| Tipo: Journal article |
Palavras-chave: Mussel beds; Mytilus chilensis; Macroinfauna; Southern Chile. |
| Ano: 2006 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2006000300007 |
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| Flores-Toro,Lorena; Contreras-López,Manuel. |
| BACKGROUND: The purpose of this paper is to present the finding of Suaeda foliosa in El Yali National Reserve, Chile. With this finding, the southern limit of the distribution is displaced from the current position at 31° S, 300 km southward. FINDINGS: In this work, we found this species on the banks of the Colejuda lagoon, 33° 45' S, which belongs to a body of hypersaline seasonal water found inside the protected area distinguished as a Ramsar site (No. 878). The determination of the genus and species was achieved by comparing with herbarium material deposited in the National Herbarium SGO Natural History Museum in Santiago de Chile. Once we identified the species, the collected material was deposited in the referred Herbarium (SGO 163975). pH, salinity,... |
| Tipo: Journal article |
Palavras-chave: Coastal wetland; Ramsar site; Displacement of limit of the distribution. |
| Ano: 2015 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2015000100002 |
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| MUÑOZ-PEDREROS,ANDRÉS; LARRAÍN,ALBERTO. |
| Este trabajo está centrado en el concepto de paisaje visual que considera la estética y la capacidad de percepción del paisaje de un observador como factores centrales. El paisaje en el sur de Chile se ha transformado en los últimos siglos, y en particular en las últimas décadas, producto de la actividad silvoagropecuaria, por lo que aquí evaluamos este paisaje en un transecto norte-sur de 587 km a lo largo de la ruta 5 Sur de Chile, en el tramo Cabrero (37º00'S, 72º23'O)- Puerto Montt (41º30'S, 72º50'O). Se establecieron Unidades de Paisaje (UP) que se cuantificaron y evaluaron empleando un método mixto con valoración directa de subjetividad representativa y análisis posterior indirecto, con análisis de componentes. Se analizaron 921 UP concluyéndose que... |
| Tipo: Journal article |
Palavras-chave: Evaluación de paisaje perceptual; Sur de Chile. |
| Ano: 2002 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2002000400004 |
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| MADANES,NORA; QUINTANA,RUBÉN D; BIONDINI,MARIELA; LOPONTE,DANIEL. |
| In the present study we assess the contribution of C3, C4 and intermediate C3-C4 plant species to the diet of both native (Hydrochoerus hydrochaeris, Rhea americana and Logostomus maximus) and introduced (cattle) herbivore species and the abundance of these photosynthetic plant types in different environments of the lower section of the Paraná Basin, Argentina, with similar climate but different hydrological regimes. Data of current plants species and their photosynthetic pathways, both form vegetation and the diet, were compiled from literature. The analysis of annual diets conducted in terms of photosynthetic types showed that the feeding patterns of native as well introduced herbivores varied both spatially and temporally. At each site, the analysis of... |
| Tipo: Journal article |
Palavras-chave: Herbivory; Neotropical ecology; Photosynthetic plants types. |
| Ano: 2010 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2010000200011 |
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| AGUILERA,MOISÉS A. |
| This paper reviews recent knowledge about the functional roles that herbivores have in intertidal communities in Chile. Specifically, I review field and laboratory studies dealing with the food preferences of herbivores, the responses of algae to herbivore attacks and reports of negative and positive functional effects of herbivores on algal populations and communities. Most herbivores studied are characterized as generalist species. Green ephemeral and a few corticated algae dominate diets, while all species considered ingest larvae and post-metamorphic stages of invertebrates challenging classical characterizations of the herbivore guild. Functional redundancy and complementarity within the herbivore guild is discussed in relation to both quantitative... |
| Tipo: Journal article |
Palavras-chave: Chile; Herbivores; Functional role; Guild; Intertidal. |
| Ano: 2011 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2011000200009 |
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| NAVARRO,JORGE M; CONTRERAS,ANDREA M; CHAPARRO,ÓSCAR R. |
| The short-term feeding response of the bivalve Mytilus chilensis was measured using four diets containing different proportions of the toxic dinoflagellate Alexandrium catenella. The diets containing the highest concentrations of the dinoflagellate showed the greatest effect on the feeding activity in the mussel, with clearance and ingestión rates significantly reduced during the first hours of exposure. After this period, M. chilensis demonstrated a capacity to acclimate to the toxic diets, with feeding parameters reaching values similar to those of untreated control organisms. It was not clear if the negative effect on the feeding behavior was caused by the presence of the paralytic toxin, or due to the larger size of the dinoflagellate cells in... |
| Tipo: Journal article |
Palavras-chave: Mytilus chilensis; Feeding response; PSP; Dinoflagellates. |
| Ano: 2008 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000100004 |
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| DÍAZ,IVÁN A.; SARMIENTO,CARLOS; ULLOA,LUIS; MOREIRA,ROGELIO; NAVIA,RAFAEL; VÉLIZ,EDUARDO; PEÑA,CARLOS. |
| Analizamos la representatividad, distribución y perspectivas de conservación de los vertebrados terrestres de la Reserva Nacional Río Clarillo, Chile central. Mediante recorridos periódicos realizados entre 1987 y 1996, determinamos la riqueza y distribución altitudinal de los vertebrados terrestres en esta Reserva. Registramos 127 especies (22 mamíferos, 85 aves, 15 reptiles y cinco anfibios), que representan el 69 % del total de especies que por su distribución geográfica y tipo de hábitat podrían habitar este lugar. De éstas, 32 especies (25 %) están catalogadas con problemas de conservación. La riqueza de vertebrados decrece con la altitud, desde 101 especies a los 870 m hasta ocho especies a los 3.050 m. La riqueza de vertebrados se concentró bajo los... |
| Tipo: Journal article |
Palavras-chave: Conservación; Vertebrados terrestres; Reserva Nacional Río Clarillo; Bosques esclerófilos; Chile central. |
| Ano: 2002 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2002000200013 |
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| MACDONELL,SHELLEY A; FITZSIMONS,SEAN J. |
| Cryoconite holes are water-filled depressions that form on glacier surfaces when uneven distributions of sediment cause differential melting to occur. Cryoconite holes are important features of cold glacier systems, as they enhance meltwater generation, enable the development of complex drainage networks and facilitate the growth of microbial communities on the glacier surface. This paper describes the development of a cryoconite hole hydrological network on an Antarctic glacier, and explores the implications for nutrient storage and delivery within the glacier system. Field measurements included measuring the internal dimensions and repeat mapping of cryoconite holes across the glacier surface, and laboratory analysis included cation and anion analysis on... |
| Tipo: Journal article |
Palavras-chave: Biogeochemistry; Drainage system; Glacier hydrology; Meltwater; Solute. |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2012000400003 |
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| Opazo,Juan C.; Soto-Gamboa,Mauricio; Fernández,Maria José. |
| Nucleotypic theory suggests that genome size play indirect roles in determining organismal fitness. Among endotherms this theory has been demonstrated by an inverse correlation between basal metabolic rate (BMR) and genome size. Nonetheless, accumulation of variables, especially for some key groups of endotherms, involved in C-value enigma (e.g., cell size) will fortify this theory. In this sense, hummingbird species are of particular interest because they are an energetic extreme in avian and endotherm evolution. Knowing that cell size is proportional to C-value, in this study we tested for a relationship between mean corpuscular volume of red blood cells and BMR in four species of hummingbirds ranging from 4 to 20 g. In comparison with other birds, our... |
| Tipo: Journal article |
Palavras-chave: Hummingbirds; Nucleotypic theory; Basal metabolic rate; Mean corpuscular volume. |
| Ano: 2005 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2005000200010 |
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| Registros recuperados: 845 | |
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