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Diversidad de aves y mamíferos marinos en bahía San Pedro, costa de Purranque, centro-sur de Chile Gayana
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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NITROGEN FLUXES IN A NOTHOFAGUS OBLIQUA FOREST AND A PINUS RADIATA PLANTATION IN THE CENTRAL VALLEY OF SOUTHERN CHILE Gayana Botánica
Oyarzún,Carlos; Godoy,Roberto; Staelens,Jeroen; Aracena,Claudia; Proschle,Juan.
Forest structure and tree species can have a significant impact on total atmospheric nitrogen (N) deposition; for example, deciduous forests have higher N requirements than coniferous forests. However, knowledge about the effect of the conversion of native Chilean vegetation cover by exotic plantations on N cycling is scarce. The aim of this study was to determine the effect of the replacement of a Nothofagus obliqua native forest by a Pinus radiata plantation in southern Chile on the chemistry of throughfall, stemflow, soil water infiltration and percolation. Pinus radiata stemflow was more acidic (pH 4.7) than precipitation (pH 5.2) and throughfall (pH 5.6), while in the Nothofagus forest stemflow and throughfall pH were 6.3 and 6.1, respectively. In the...
Tipo: Journal article Palavras-chave: Ammonium; Infiltration; Nitrate; Soil percolation; Throughfall.
Ano: 2005 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432005000200004
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NITROGEN FLUXES IN THROUGHFALL AND LITTERFALL IN TWO NOTHOFAGUS FORESTS IN SOUTHERN CHILE Gayana Botánica
Staelens,Jeroen; Godoy,Roberto; Oyarzún,Carlos; Thibo,Karen; Verheyen,Kris.
Nitrogen return by leaf litterfall was compared with atmospheric nitrogen deposition for two deciduous Nothofagus stands in southern Chile, located in areas with contrasting land use. The litterfall return of nitrogen in a Nothofagus alpina (Poepp. et Endl.) Oerst. stand at San Pablo de Tregua, in the Cordillera de los Andes, was similar to the litterfall return in a Nothofagus obliqua (Mirb.) Oerst. stand at Paillaco, in the Central Depression. In contrast, the net throughfall and stemflow deposition differed significantly between the two stands. At San Pablo de Tregua, the annual bulk deposition of NH4+ and NO3- was significantly higher than the throughfall and stemflow deposition reaching the forest floor. This demonstrates an uptake of inorganic...
Tipo: Journal article Palavras-chave: Ammonium; Atmospheric deposition; Canopy interactions; Nitrate; Nutrient cycling; Amonio; Ciclos de nutrientes; Depositación atmosférica; Interacciones del dosel; Nitrato.
Ano: 2005 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432005000200002
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ATMOSPHERIC N DEPOSITION IN CENTRAL AND SOUTHERN CHILE: AN OVERVIEW Gayana Botánica
Godoy,Roberto; Paulino,Leandro; Oyarzún,Carlos; Boeckx,Pascal.
Temperate forests in Chile are not yet affected by elevated nitrogen (N) deposition. However, anthropogenic activities such as transport, industry and agriculture have been increasing in central and southern Chile. These activities can substantially alter the atmospheric N load and subsequently N deposition. Nitrogen deposition data for central and southern Chile are scares and scattered. In order to assess trends of N deposition a good knowledge of past and current N depositions is however essential. This study presents an overview of the existing N deposition data in Chile. In central Chile, dry deposition has been estimated at 0.8 kg NO3--N ha-1 yr-1 and 1.0 kg NH4+-N ha-1 yr-1, giving a total of 1.8 kg N ha-1 yr-1 and wet deposition was 0.4 kg NO3--N...
Tipo: Journal article Palavras-chave: Atmospheric deposition; Central and southern Chile; Mineral N; Organic N.
Ano: 2003 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432003000100008
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COMPARISON OF DRY DEPOSITION AND CANOPY EXCHANGE OF BASE CATIONS IN TEMPERATE HARDWOOD FORESTS IN FLANDERS AND CHILE Gayana Botánica
Staelens,Jeroen; Schrijver,An De; Oyarzún,Carlos; Lust,Noël.
Bulk precipitation, throughfall and stemflow of base cations Na+, K+, Mg2+ and Ca2+ were measured in two deciduous beech forests, located in regions with different air pollution characteristics and strongly differing in soil acidity and soil base saturation. The contribution of dry deposition and canopy leaching to net throughfall flux was estimated using Na+ as a tracer ion. The input of base cations via bulk precipitation was not significantly different between Nothofagus obliqua (Mirb.) Bl. in southern Chile and Fagus sylvatica L. in Flanders. However, net throughfall input of Ca2+ and Mg2+ to the forest floor was significantly higher in Chile than in Flanders. Potassium fluxes were similar in both studied stands. Dry deposition of Ca2+ was higher in...
Tipo: Journal article Palavras-chave: Atmospheric deposition; Base cations; Fagaceae; Forest canopy; Throughfall.
Ano: 2003 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432003000100003
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Dry deposition of nitrogen to passive samplers in grassland and forest canopies in the Central depression of southern Chile Gayana Botánica
Godoy,Roberto; Haneke,Jörgen; Staelens,Jeroen; Oyarzún,Carlos; Paulino,Leandro; Barrientos,Mónica.
The growth of intensive livestock farming in the central depression of southern Chile (40° S) during the last century has resulted in elevated emissions of inorganic nitrogen (N) compounds into the atmosphere, particularly of NH3. Consequently, atmospheric N has been deposited to lakes, vegetation, and soil. Much attention has been paid to wet N deposition in southern Chile, while almost nothing is known about dry N deposition in this region. Our aim is to use an exploratory approach with SAM (Standard Air Monitoring) filters to investigate the potential contribution of the dry N deposition to the total N deposition in the central depression of southern Chile. Furthermore, the relationship between micro-climatological patterns and dry deposition was...
Tipo: Journal article Palavras-chave: Atmospheric deposition; Nitrogen; Nothofagus obliqua forest; Pinus radiata plantation; Surrogate surface.
Ano: 2005 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432005000200006
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Actividad biológica del suelo en dos bosques de Nothofagus del centro sur de Chile Gayana Botánica
Rivas,Yessica; Godoy,Roberto; Valenzuela,Eduardo; Leiva,Javier; Oyarzún,Carlos; Alvear,Marysol.
Los bosques templados prístinos del sur de Chile tienen un bajo ingreso de nitrógeno (N) vía depositación atmosférica, por lo que la productividad del ecosistema depende principalmente del reciclaje interno de nutrientes, contenido en la materia orgánica del suelo (MOS). Se postula que existen diferencias en la actividad biológica del suelo entre un bosque secundario de Nothofagus obliqua de la Depresión Intermedia en Chile, influenciado por la actividad agrícola-ganadera y condiciones microclimáticas templadas favorables para la descomposición de la MOS, al comparar con un bosque prístino de Nothofagus betuloides de la Cordillera de los Andes, con microclima extremo. El presente estudio compara la tasa de mineralización de carbono (C-min), N (N-min) y las...
Tipo: Journal article Palavras-chave: Bosque templado; C- mineralización; N- mineralización; Dehidrogenasas; Fosfatasa ácida.
Ano: 2007 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432007000100008
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POSSIBILITIES FOR ECOHYDROLOGICAL MONITORING IN NATURAL AND MANAGED ECOSYSTEMS IN SOUTHERN CHILE Gayana Botánica
Peters,Jan; Wieme,Vanessa; Boeckx,Pascal; Samson,Roeland; Godoy,Roberto; Oyarzún,Carlos; Verhoest,Niko.
Ecohydrology investigates how hydrological processes affect plant growth and vice versa. As these mutual interactions are important in many ecosystems, ecohydrology has wide applicability. An important aspect of ecohydrological research is the assessment and prediction of the occurrence of plant species or vegetation types in relation to hydrological or hydrogeochemical habitat conditions. Several models have been developed (e.g. DEMNAT, ICHORS, ITORS, ITORS-VL). All of these models are data driven. Consequently a monitoring network has to be installed, possibly in addition to existing databases. These networks are ecosystem specific but the most widely monitored variables are: water table depth, electric conductivity of groundwater, soil moisture content...
Tipo: Journal article Palavras-chave: Ecohydrology; Modelling; Vegetation; Hydrology; Decision support systems.
Ano: 2005 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432005000200007
Registros recuperados: 8
Primeira ... 1 ... Última
 

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