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Search Results: 1 - 10 of 17748 matches for " high andean vegetation. "
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Plant community variation across a puna landscape in the Chilean Andes
LAMBRINOS,JOHN G; KLEIER,CATHERINE C; RUNDEL,PHILIP W;
Revista chilena de historia natural , 2006, DOI: 10.4067/S0716-078X2006000200009
Abstract: we describe patterns of plant species and growth form abundance in the puna vegetation of parque nacional lauca, chile. at more than 4,300 m, the extreme habitat of the study site supported relatively few species. these few species, however, represented a diverse array of growth forms that were organized with respect to distinct environmental gradients. both species richness and growth form diversity increased with the degree of habitat rockiness and on more xeric north and east facing slopes. these xeric, rocky sites supported the greatest overall abundance of cushion forms. less rocky sites with more soil development supported a greater abundance of tussock grass and shrub forms. congeneric species occupied distinct microhabitats and were often markedly divergent in growth form. these patterns suggest that water and thermal stress are critical forces shaping functional form as well as community organization in the high andean puna
LA VEGETACIóN DEL HUMEDAL DE JABOQUE (BOGOTá, D.C.)
HERNáNDEZ-R.,JULIANA; RANGEL-CH.,J. ORLANDO;
Caldasia , 2009,
Abstract: the aquatic, helophytic and pleustophytic vegetation of the wetland jaboque, bogotá, colombia was studied following the sigmatista-zurich montpellier approach. the fourteen communities growing along a water ecological series included those dominated by schoenoplectus californicus, by juncus effusus and by typha latifolia. on marsh near the borders or in the inner of shallow pan the communities dominated by polypogon elongatum, rumex conglomerates and carex luridiformis were growing. in the transition zone-between aquatic and terrestrial environments the tapes ("camalotales") dominated by bidens laevis, ludwigia peploides, and polygonum punctatum were established. on the scarce mirrors of water appear the floating tapes with eichnornia crassipes, limnobium laevigatum and lemna gibba. the diversity and richness of species and plant communities were greater in the wider and better conserved zone, near the florida park, where the majority of the plant communities mentioned in this contribution were represented. in the zone very changed (zone with channels) a few of communities were established, specially the camalotales with bidens laevis, polygonum punctatum and prairies with pennisetum clandestinum (kikuyo) and polypogon elongatus. the plant communities recorded from the jaboque have a wide geographical distribution, growing on andean lakes and marshes, specially in the high-plain around bogotá and places of cundinamarca and boyacá departments.
Plant community variation across a puna landscape in the Chilean Andes Variación en la comunidad vegetal de un paisaje de puna en los Andes chilenos
JOHN G LAMBRINOS,CATHERINE C KLEIER,PHILIP W RUNDEL
Revista chilena de historia natural , 2006,
Abstract: We describe patterns of plant species and growth form abundance in the puna vegetation of Parque Nacional Lauca, Chile. At more than 4,300 m, the extreme habitat of the study site supported relatively few species. These few species, however, represented a diverse array of growth forms that were organized with respect to distinct environmental gradients. Both species richness and growth form diversity increased with the degree of habitat rockiness and on more xeric north and east facing slopes. These xeric, rocky sites supported the greatest overall abundance of cushion forms. Less rocky sites with more soil development supported a greater abundance of tussock grass and shrub forms. Congeneric species occupied distinct microhabitats and were often markedly divergent in growth form. These patterns suggest that water and thermal stress are critical forces shaping functional form as well as community organization in the high Andean puna Describimos los patrones de abundancia de las especies vegetales y las formas de vida en la vegetación de puna en el Parque Nacional Lauca, Chile. A una altitud que excede los 4.300 m de altitud, el hábitat extremo de nuestro sitio de estudio presenta relativamente pocas especies. Dichas especies, sin embargo, representan un arreglo diverso de formas de vida organizadas con respecto a distintos gradientes ambientales. Tanto la riqueza de especies como el hábito de crecimiento aumentaron en los suelos más rocosos y en las pendientes expuestas al norte y al este, cuya vegetación es más xerófila. Dichos sitios presentaron la mayor abundancia en formas de cojines. Los sitios menos rocosos con un suelo más desarrollado presentaron una mayor abundancia de pastos y arbustos. Distintos microhábitats fueron ocupados por especies congénericas que con frecuencia divergieron en su hábito de crecimiento. Los patrones observados sugieren que el agua y el estrés térmico son fuerzas críticas que moldean la forma funcional de las especies vegetales así como la organización de las comunidades de plantas en la puna altoandina
Influence of Water Quality on the Variation Patterns of the Communities of Benthic Macroinvertebrates in the Lakes of the Central Highlands of Peru  [PDF]
María Custodio, Richard Pe?aloza
Open Journal of Marine Science (OJMS) , 2019, DOI: 10.4236/ojms.2019.91001
Abstract:
The influence of water quality on the variation patters of benthic macroin-vertebrate communities in the lakes in the central highlands of Peru was eva-luated. Samples of water and sediments were collected in 23 different sam-pling sites last 2017. The physiochemical variables of water quality deter-mined on site were: DO, TDS, EC, temperature and pH. The results obtained revealed that the physiochemical indicators are within the environmental quality standards for water, except COD and BOD5. Regarding the benthic macroinvertebrates, four phyla were identified wherein the most common is the phylum Arthropoda having the abundance and richness of taxa. The PCA reduced the variables to a few significant components that caused variation in water quality between lakes. The cluster analysis in relation to the relative abundance of benthic macroinvertibrates grouped the 22 sampling sites into three groups with the similar characteristics. The PCoA analysis of the ben-thic macroinvertebrate communities showed a clear separation of sites. The SIMPER analysis at the family-level showed the distribution of the most common species. Therefore, at a significance level of 0.01 it demonstrates that there are significant differences between the number of species and abun-dance of the areas that were evaluated.
Primer registro de Oncopoduridae (Collembola: Entomobryomorpha) para Colombia
AVILA A.,DANIEL; JARAMILLO C.,YENDA;
Revista Colombiana de Entomología , 2011,
Abstract: the family oncopoduridae (entomobryomorpha: arthropleona), represented by the species harlomillsia oculata, is reported for the first time in colombia. the samples were collected in blackberry crops and kikuyu grass pastures belonging to the andean high forest of the eastern cordillera at 2600 m elevation.
CATáLOGO COMENTADO DE LAS HEPáTICAS DEL CERRO DE MAMAPACHA, MUNICIPIO DE CHINAVITABOYACá, COLOMBIA
áLVARO ALBA,WILSON RICARDO; DíAZ PITA,MóNICA PATRICIA; MORALES PUENTES,MARíA EUGENIA;
Acta Biológica Colombiana , 2007,
Abstract: we present the whole catalogue with comments of the 77 species of liverworts that were present in the mamapacha mountain, which is organized by alphabetical order of families, genera and species. information about their growth forms, abundance, habitat and distribution is as well presented. of importance, there are 23 new species records to the department of boyacá.
Catálogo comentado de las hepáticas del cerro de Mamapacha municipio de Chinavita-Boyacá, Colombia Catalogue of Liverworts from Mamapacha Mountain, Chinavita, Boyacá, Colombia
álvaro Alba Wilson Ricardo,Díaz Pita Mónica Patricia,Morales Puentes María Eugenia
Acta Biológica Colombiana , 2007,
Abstract: Se presenta el catálogo comentado de 77 especies de hepáticas presentes en el cerro de Mamapacha en donde se organizan alfabéticamente las familias, géneros y especies. Se proporciona información sobre la forma de crecimiento, abundancia, hábitat y distribución. Se resalta la presencia de 23 especies como nuevos registros para Boyacá. We present the whole catalogue with comments of the 77 species of liverworts that were present in the Mamapacha Mountain, which is organized by alphabetical order of families, genera and species. Information about their growth forms, abundance, habitat and distribution is as well presented. Of importance, there are 23 new species records to the department of Boyacá.
Combined efficacy assessment of soil solarization and bio-fungicides for management of Sclerotinia spp. in lettuce (Lactuca sativa L.)
Gil,Rodrigo; Smith,Alexander; Chaves,Bernardo; Wyckhuys,Kris; Forero,Clemencia; Jiménez,Jaime;
Agronomía Colombiana , 2009,
Abstract: white mould: sclerotinia spp., is the lettuce main disease in the colombian high andes. it causes yield losses of up to 70% and is primarily managed with chemical fungicides, while alternative control strategies are poorly used. soil solarization and a set of chemical and bio-fungicides for sclerotinia management efficacy in lettuce, were determined. biofungicides included different doses of allium sativum and matricaria recutita extracts and trichoderma koningiopsis suspensions. the fungicide procymidone was also evaluated. field trials included single or combined treatments application. non-linear modelling and audpc were employed to determine the efficacy of management strategies. both s. sclerotiorum and s. minor caused white mould, being s. minor the dominant species. solarization significantly lowered sclerotia population in the upper soil layers and consequently lowered disease incidence. highest levels of sclerotinia control were achieved with solarization, particularly in combination with procymidone or t. koningiopsis (79.08% and 41.50% disease reduction, respectively). non-linear modeling of disease epidemic progress curve proved a valuable alternative to audpc, which allowed multiple disease development parameters estimation and indirectly the efficacy of management strategies. this work should help the advance of environmentally-sound management of sclerotinia spp. in lettuce, under the highly specific growing conditions of the high andes.
SANTUARIOS DE ALTURA EN LA REGIóN DE LA LAGUNA BRAVA (PROVINCIA DE LA RIOJA, NOROESTE ARGENTINO).: INFORME DE PROSPECCIóN PRELIMINAR
Ceruti,María Constanza;
Chungará (Arica) , 2003, DOI: 10.4067/S0717-73562003000200004
Abstract: the preliminary results of the archaeological survey in the area of laguna brava, in the andes of western argentina, are presented in this paper. the aim is to provide a record of inca ceremonial activity at the summit of mountains associated with this lagoon. the presentation includes data related to the architectural and surface record from the high-altitude shrines located above 16,500 feet, on the summits of mounts morado and pilar , as well as the inca sites located at the shore of the lagoon and on the hills that surround it. sites on those summits are perceived as "satellite shrines" that are articulated with ceremonial complexes of higher hierarchy in the region. in the discussion and conclusions, the cult and symbolic aspects of these shrines that encircle laguna brava are interpreted with the aid of ethnohistorical and ethnographic references.
Primer registro de Oncopoduridae (Collembola: Entomobryomorpha) para Colombia First report of Oncopoduridae (Collembola: Entomobryomorpha) from Colombia
DANIEL AVILA A.,YENDA JARAMILLO C.
Revista Colombiana de Entomología , 2011,
Abstract: Se registra por primera vez para Colombia la familia Oncopoduridae (Entomobryomorpha: Arthropleona) representada por la especie Harlomillsia oculata. Los ejemplares se recolectaron en cultivo de mora y pastizal de kikuyo circunscritos a bosque alto andino de la cordillera oriental a 2600 msnm de altitud. The family Oncopoduridae (Entomobryomorpha: Arthropleona), represented by the species Harlomillsia oculata, is reported for the first time in Colombia. The samples were collected in blackberry crops and kikuyu grass pastures belonging to the Andean high forest of the eastern cordillera at 2600 m elevation.
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