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Search Results: 1 - 10 of 7663 matches for " Enrique Hauenstein "
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Visión sinóptica de los macrofitos dulceacuícolas de Chile
Hauenstein,Enrique;
Gayana (Concepción) , 2006, DOI: 10.4067/S0717-65382006000100004
Abstract: by means of a bibliographic review, a panorama of the state of art of the vascular macrophytes of chilean continental aquatic systems was carried through. 455 species of aquatic macrophytes were registered, 3 of them belonging to gymnospermae, 15 to pteridophytes, 184 to monocotyledoneae and 253 to dicotyledoneae. only 62 of the total are typical hidrophytes. the total of the macrophytes represents 8,7% of the continental chilean flora, and the hidrophytes, only 1,2%. in terms of phytogeographic origins, the high percentage of native species is outstanding (79,3%) in relation to the introduced species (20,7%). in terms of their conservation state, only gymnospermae and pteridophytes have this condition clearly defined; of the 18 registered species in these two groups, 4 are considered "endangered", 3 "vulnerable", and 2 "rare". the lack of the corresponding studies referring to the rest of the species is a clear sign that this topic has to be urgently considered, together with the taxonomic study of important family genera, such as cyperaceae, juncaceae and potamogetonaceae, in addition to antecedents about their ecophysiology.
Visión sinóptica de los macrofitos dulceacuícolas de Chile A synoptical view of freshwater macrophytes of Chile
Enrique Hauenstein
Gayana (Concepción) , 2006,
Abstract: En base a revisión bibliográfica, se realizó una sinopsis del estado del arte de las macrófitas vasculares de ecosistemas acuáticos continentales de Chile. Se registró un total de 455 especies de macrófitas acuáticas, de las cuales 3 corresponden a gimnospermas, 15 a pteridófitos, 184 a monocotiledóneas y 253 a dicotiledóneas. De éstas, sólo 62 son hidrófitas típicas. El total de estas macrófitas representa el 8,7% de la flora de Chile continental, y las hidrófitas sólo el 1,2%. Respecto de su origen fitogeográfico, destaca el alto porcentaje de especies nativas (79,3%) sobre las introducidas (20,7%). En cuanto a su estado de conservación, sólo las gimnospermas y pteridófitos tienen claramente definida esta condición; de las 18 especies registradas en estos dos grupos, 4 están en la condición de En Peligro, 3 Vulnerables y 2 Raras. El resto de las especies carece de estudios al respecto, lo que da claras se ales a los especialistas sobre un tema que debe abordarse con urgencia, junto con la revisión taxonómica de algunos géneros de familias importantes, como Cyperaceae, Juncaceae y Potamogetonaceae, además de antecedentes sobre su ecofisiología. By means of a bibliographic review, a panorama of the state of art of the vascular macrophytes of chilean continental aquatic systems was carried through. 455 species of aquatic macrophytes were registered, 3 of them belonging to Gymnospermae, 15 to Pteridophytes, 184 to Monocotyledoneae and 253 to Dicotyledoneae. Only 62 of the total are typical hidrophytes. The total of the macrophytes represents 8,7% of the continental chilean flora, and the hidrophytes, only 1,2%. In terms of phytogeographic origins, the high percentage of native species is outstanding (79,3%) in relation to the introduced species (20,7%). In terms of their conservation state, only Gymnospermae and Pteridophytes have this condition clearly defined; of the 18 registered species in these two groups, 4 are considered "endangered", 3 "vulnerable", and 2 "rare". The lack of the corresponding studies referring to the rest of the species is a clear sign that this topic has to be urgently considered, together with the taxonomic study of important family genera, such as Cyperaceae, Juncaceae and Potamogetonaceae, in addition to antecedents about their ecophysiology.
Experiencia de conservación ex-situ de Solanum fernandezianum (Solanaceae)
Solano,Jaime; Anabalón,Leonardo; Hauenstein,Enrique;
Gayana. Botánica , 2011, DOI: 10.4067/S0717-66432011000100011
Abstract: solanum fernandezianum is an endemic species in danger of extinction the robinson crusoe island, chile. the fruit was collected during march and april of 2002. the seeds were storaged for a year to 4°c. the percentage of germination in laboratory conditions was 14.3%. after 22 weeks plants initiated flowering and fruiting. the conservation strategy considered germination of seeds, production of plants in incubation chamber, transplantation to pots and pots arranged in a greenhouse.
Experiencia de conservación ex-situ de Solanum fernandezianum (Solanaceae) Experience of Conservation ex-situ of Solanum fernandezianum (Solanaceae)
Jaime Solano,Leonardo Anabalón,Enrique Hauenstein
Gayana. Botanica , 2011,
Abstract: Solanum fernandezianum is an endemic species in danger of extinction the Robinson Crusoe Island, Chile. The fruit was collected during March and April of 2002. The seeds were storaged for a year to 4°C. The percentage of germination in laboratory conditions was 14.3%. After 22 weeks plants initiated flowering and fruiting. The conservation strategy considered germination of seeds, production of plants in incubation chamber, transplantation to pots and pots arranged in a greenhouse.
Determinación y caracterización botánica de hábitats mapuche del sector Zewko-Rüpükura, comuna de Nueva Imperial (IX Región, Chile)
Carolyn Sánchez,Enrique Hauenstein,Luis Peralta
Cultura-Hombre-Sociedad , 2004, DOI: 10.7770/cuhso-v8n1-art202
Abstract: Se determinaron los hábitats mapuche presentes en la comunidad indígena Zewko del sector Rüpükura, comuna de Nueva Imperial, IX Región, Chile, y se caracterizaron botánicamente los más reconocidos. Se les analizó desde el punto de vista mapuche y occidental, aplicando paralelamente metodologías participativas y botánicas. Se identificaron 23 ecosistemas, de los cuales 8 fueron mencionados como los más relevantes; de éstos, el menoko (38%), el malli (19%) y el trayen (13%) son los que presentaron los más altos porcentajes de importancia. Vegetacionalmente se caracterizaron dos comunidades vegetales nativas, la pradera húmeda de junquillo (Juncetum procerii), correspondiente al malli , y el bosque pantanoso de temo y pitra (Blepharocalyo-Myrceugenietum exsuccae), que corresponde al menoko. Con respecto a la flora vascular se identificaron 91 especies en el sector, de las cuales el 72% correspondió a especies nativas. La forma de vida mayormente representada fueron los hemicriptófitos con un 40%. Al analizar los dos ámbitos de la investigación se reconoció la diferente concepción existente entre los sistemas de caracterización mapuche V/S el sistema ecológico occidental convencional, por lo que se hace esencial considerar estas diferencias a la hora de investigar acerca de los recursos naturales.
Composición de la flora de praderas andinas en la Reserva Nacional Alto Bío-Bío (Lonquimay-Chile) y su relación con el régimen de pastoreo
Fuentes-Ramírez,Andrés; Pauchard,Aníbal; Hauenstein,Enrique;
Gayana. Botánica , 2011, DOI: 10.4067/S0717-66432011000100004
Abstract: andean grasslands of the la araucanía region are used every year by pehuenches communities as forage resources for their livestock. grazing is one of the most important disturbances which affect natural meadows and can produce changes at community level in the species richness and plant composition. with the aim of determining the floristic composition of the andean grasslands in the alto bío-bío national reserve (37° s y 70° w) and its relationship with the cattle load, we studied five sites within the reserve: cuchares grande, cajón chileno, tralilhue, cuchares chico and mancha de pinos. in each site, we sampled 20 random plots recording all the species and their relative cover. we recorded a total of 89 species of vascular plants. taxonomic richness is represented by two pteridophyta and 87 magnoliophyta species. in this last group, 25 species are liliopsida and 62 are magnoliopsida. all flora is distributed in 37 families and 72 genera. greatest families, in species number, are asteraceae (13), poaceae (11), cyperaceae (6) and rosaceae (6). about the origin, 88 species are native and only 11 are introduced, representing 88% and 12%, respectively. life forms are represented mostly by hemicryptophytes with 53%, then cryptophytes arround 17% and finally chamaephytes (15%). grasslands wich have greater livestock density, have a higher proportion of introduced species and hemicryptophytes and a greater floristic similarity between them, while those with lower livestock densities have a higher native species proportion. these results suggest that cattle use could have a significant impact in the floristic composition of andean grasslands. even though, the low proportion of introduced species found, the high percentage of hemicryptophytes indicates an intermediate level of disturbance.
Inducción de enraizamiento en estacas de Berberidopsis corallina con ácido indolbutírico
Latsague Vidal,Mirtha; Sáez Delgado,Patricia; Hauenstein Barra,Enrique;
Bosque (Valdivia) , 2008, DOI: 10.4067/S0717-92002008000300006
Abstract: berberidopsis corallina is an endemic species from chile, presenting conservation problems and being catalogued as “endangered” species. its persistent diminution is associated to cutting and competition with eucalyptus spp. and pinus radiata. the objective of the present work was to contribute in the management for the recovery of this species through the evaluation of its reproductive capacity by means of propagation by cuttings. for vegetative propagation, semi-woody cuttings were collected during march of 2007 in villa las araucarias, region of la araucanía. the collected cuttings were treated with indolbutyric acid (iba) at different concentrations (0, 500, 1,000 and 1,500 mgl-1) as rooting stimulator. after five months of maintenance of cuttings in a bottom heating, an 87% of total rooting was obtained. the best result concerning the process of rizogenesis was shown by 1,000 mg l-1 iba with a 90% of rooting. besides, the highest average of root length was found in this same treatment with an average of 13.6 cm. the greatest number of roots was obtained in 1,500 mgl-1 treatment with a value average of 38.1 roots by cuttings. it is concludes that b. corallina can be vegetatively reproduced through the rizogenesis of cuttings treated with iba, as a practice to contribute to the recovery of this species.
Composición de la flora de praderas andinas en la Reserva Nacional Alto Bío-Bío (Lonquimay-Chile) y su relación con el régimen de pastoreo Floristic composition of Andean grassland in Alto Bío-Bío National Reserve (Lonquimay-Chile) and its relationship with the grazing regimen
Andrés Fuentes-Ramírez,Aníbal Pauchard,Enrique Hauenstein
Gayana. Botanica , 2011,
Abstract: Las praderas andinas de la Región de La Araucanía son usadas estacionalmente por comunidades Pehuenches como forraje para sus animales. El pastoreo es una de las principales perturbaciones que afectan a las praderas naturales, pudiendo generar cambios a nivel comunitario en la composición y en la riqueza de especies. Con el objetivo de determinar la composición de la flora de las praderas andinas de la Reserva Nacional Alto Bío-Bío (37° S y 70° O) y su relación con la carga animal que soporta cada una, se estudiaron cinco sitios al interior de la reserva: Cuchares Grande, Cajón Chileno, Tralilhue, Cuchares Chico y Mancha de Pinos. En cada sitio se realizaron 20 parcelas al azar, registrándose todas las especies presentes y su cobertura relativa. En total se registraron 89 especies de plantas vasculares. La riqueza taxonómica está representada por dos especies de Pteridophyta y 87 de Magnoliophyta, de las cuales 25 son Liliopsida y 62 Magnoliopsida. Las 89 especies se distribuyen en 72 géneros y 37 familias, siendo las más numerosas Asteraceae (13), Poaceae (11), Cyperaceae (6) y Rosaceae (6). De las especies determinadas, un 88% son nativas y 12%, introducidas. Las formas de vida están representadas principalmente por hemicriptófitos con un 53%, criptófitos (17%) y caméfitos (15%). Las praderas que tienen mayor carga ganadera son las que presentan mayor proporción de especies introducidas y hemicriptófitas, existiendo mayor similitud florística entre ellas, mientras que las que tienen menor carga ganadera presentan mayor proporción de especies nativas. Estos resultados sugieren que el uso ganadero podría tener efectos importantes en el cambio de la composición de la flora de las praderas andinas. A pesar de la baja proporción de especies introducidas en total, el alto porcentaje de hemicriptófitos indicaría un grado medio de perturbación. Andean grasslands of the La Araucanía Region are used every year by Pehuenches communities as forage resources for their livestock. Grazing is one of the most important disturbances which affect natural meadows and can produce changes at community level in the species richness and plant composition. With the aim of determining the floristic composition of the Andean grasslands in the Alto Bío-Bío National Reserve (37° S y 70° W) and its relationship with the cattle load, we studied five sites within the reserve: Cuchares Grande, Cajón Chileno, Tralilhue, Cuchares Chico and Mancha de Pinos. In each site, we sampled 20 random plots recording all the species and their relative cover. We recorded a total of 89 species of va
Inducción de enraizamiento en estacas de Berberidopsis corallina con ácido indolbutírico Induction of rooting in cuttings of Berberidopsis corallina with indol butyric acid
Mirtha Latsague Vidal,Patricia Sáez Delgado,Enrique Hauenstein Barra
Bosque (Valdivia) , 2008,
Abstract: Berberidopsis corallina es una especie endémica de Chile que debido a su estado de conservación ha sido catalogada como especie “en peligro de extinción”. Su persistente disminución ha estado asociada a tala y competencia con Eucalyptus spp. y Pinus radiata. El objetivo del presente trabajo fue contribuir en la gestión de recuperación de esta especie a través de la evaluación de su capacidad reproductiva mediante propagación por estacas. Para la propagación vegetativa se colectaron estacas semile osas durante marzo de 2007 en el sector Villa Las Araucarias, Región de La Araucanía. Las estacas cosechadas se trataron con ácido indolbutírico (AIB) en distintas concentraciones (0, 500, 1.000 y 1.500 mg L-1) como factor de enraizamiento. Después de cinco meses de mantenidas las estacas en cama caliente se obtuvo un 87% de enraizamiento total. La concentración de AIB de 1.000 mg L-1 mostró los mejores resultados respecto al proceso de rizogénesis con un 90% de enraizamiento. Además se encontró el mayor promedio de longitud de raíces en este mismo tratamiento con un promedio de 13,64 cm. El mayor número de raíces se obtuvo en el tratamiento 1.500 mg L-1 con un valor promedio de 38,11 raíces por estaca. Se concluye que B. corallina puede ser reproducido vegetativamente a través de la rizogénesis de estacas tratadas con AIB, como una práctica para contribuir a la recuperación de esta especie. Berberidopsis corallina is an endemic species from Chile, presenting conservation problems and being catalogued as “endangered” species. Its persistent diminution is associated to cutting and competition with Eucalyptus spp. and Pinus radiata. The objective of the present work was to contribute in the management for the recovery of this species through the evaluation of its reproductive capacity by means of propagation by cuttings. For vegetative propagation, semi-woody cuttings were collected during March of 2007 in Villa Las Araucarias, Region of La Araucanía. The collected cuttings were treated with Indolbutyric acid (IBA) at different concentrations (0, 500, 1,000 and 1,500 mgL-1) as rooting stimulator. After five months of maintenance of cuttings in a bottom heating, an 87% of total rooting was obtained. The best result concerning the process of rizogenesis was shown by 1,000 mg L-1 IBA with a 90% of rooting. Besides, the highest average of root length was found in this same treatment with an average of 13.6 cm. The greatest number of roots was obtained in 1,500 mgL-1 treatment with a value average of 38.1 roots by cuttings. It is concludes that B. corallina can be veg
Composición y estructura de la vegetación epífita vascular en un bosque primario de Olivillo (Aextoxicon punctatum R. et P.) en el sur de Chile
San Martín,José; Espinosa,Alejandro; Zanetti,Silvana; Hauenstein,Enrique; Ojeda,Nelson; Arriagada,César;
Ecolog?-a austral , 2008,
Abstract: vascular epiphytes represent 10% of the total vascular plants of the world. nevertheless, because it is hard to reach them in the forest upper-canopy where they usually live, there are few studies (especially in chile) about them. with the objective of identifying the vascular epiphytes growing on tree stems (under 1.5 m height), we sampled three transects in an olivillo old-growth stand, in the rucamanque forest, in the central valley of south-central chile, near the city of temuco. several variables were measured for both the vascular epiphytes and their host-trees. we studied the floristic composition of the vascular epiphytes community, and their relationship with their host-trees, as well as their sociability, cover, and frequency. eight vascular epiphytes species were identified, corresponding to four genus distributed in three families: hymenophyllum and hymenoglossum (hymenophyllaceae), asplenium (aspleniaceae) and sarmienta (gesneriaceae). we found only a non-statistically significant linear correlation between vascular epiphytes and their host-trees. we determined that hymenophyllum cuneatum was the most important vascular epiphytes species.
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