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| Registros recuperados: 44 | |
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| Jiménez Noriega, Mayte Stefany. |
| Las condiciones ambientales asociadas a gradientes altitudinales inducen modificaciones de las características morfo-anatómicas de las especies que ahí se encuentran. Las variaciones morfo-anatómicas en regiones intertropicales han sido poco documentadas. Se espera que los patrones relacionados con estos gradientes altitudinales serán similares a aquellos registrados en regiones fuera de la zona intertropical. Se estudiaron seis especies (Acaena elongata, Alchemilla procumbens, Geranium seemannii, Lupinus montanus, Ribes ciliatum y Symphoricarpos microphyllus) que se distribuyen en el gradiente altitudinal del Cerro Tláloc, Estado de México con el objetivo de reconocer y evaluar las modificaciones morfo-anatómicas asociadas al gradiente. Se recolectaron... |
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Palavras-chave: Anatomía; Morfología; Variación; Gradientes altitudinales; Madera; Anatomy; Morphology; Altitude; Variation; Altitudinal gradients; Wood; Botánica; Maestría. |
| Ano: 2014 |
URL: http://hdl.handle.net/10521/2294 |
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| Quiroz Guerrero, Ismael. |
| En la zona de abasto del ingenio La Gloria, en Veracruz, se desconocen la percepción y actitud de los productores de caña respecto al uso de composta de cachaza y vinaza. Por tanto, el objetivo de este trabajo fue determinar la percepción y actitud del productor cañero respecto al uso de composta de cachaza y vinaza en suelos cultivados con caña de azúcar. Este estudio, se realizó en la zona de abasto del ingenio La Gloria, Veracruz. Los productores fueron seleccionados en 47 que han aplicado composta, 50 que han aplicado vinaza y 50 que no han aplicado estos subproductos. Mediante un cuestionario se hicieron entrevistas personales. Se analizó la escala Likert, la frecuencia, estadísticas descriptivas, escalas multidimensionales y factores mediante el... |
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Palavras-chave: Percepción; Actitud; Composta de cachaza; Vinaza; Perception; Altitude; Filter cake; Vinasse; Maestría; Agroecosistemas Tropicales. |
| Ano: 2010 |
URL: http://hdl.handle.net/10521/430 |
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| Vega,Emil C.; Jara,Jorge C.. |
| Em duas zonas de latitudes similares e com diferentes altitudes, tais como Portoviejo (Região Costa) e Riobamba (Região Andina) no Equador, procurou-se ajustar os modelos de Holdridge (Ho) e Hargreaves-Samani (H-S) e com três modificações (modelos com constantes C HO e KE e KT Diário, Mensal e Anual, respectivamente) com o propósito de estimar a evapotranspiração de referência (ETo), em diferentes níveis das médias móveis do tempo, para o período de três dias. Uma vez ajustados os coeficientes C HO, KE e KT, estimou-se a ETo e foram validados os resultados mediante comparação com as mensurações da ETo, utilizando-se da evaporação do tanque Classe A com seu respectivo coeficiente (ETo Pan). Nos coeficientes C HO (Ho) e KE (H-S), o melhor desempenho foi... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Evapotranspiração de referência (ETo); Altitude; Temperatura; Déficit de pressão de vapor; Hargreaves-Samani. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162009000300006 |
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| Cárdenas Garrido,Cecilia; Lusk,Christopher H.. |
| It has been argued that if the cost of investment in cold resistance mechanisms detracts significantly from growth rates, then height growth tradeoffs should control species sorting on latitudinal temperature gradients. Applying the same logic to altitudinal temperature gradients, it can be predicted that species' upper altitudinal limits will be fixed by their degree of cold resistance, whereas the lower altitudinal limits of species growing higher up will be set by competition from faster-growing thermophilous species. We tested this prediction for three Nothofagus species on an altitudinal gradient (1,100 - 1,700 m) near Termas de Chillán, on the lower western slopes of the Andean Cordillera. We used retrospective methods to measure height increment... |
| Tipo: Journal article |
Palavras-chave: Altitude; Cold resistence; Competition; Temperate forest; Tradeoff. |
| Ano: 2002 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432002000100004 |
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| Körner,Christian. |
| Nearly forty percent of mankind depend in one way or another on mountain ecosystems. Local ecosystem services are slope stability, water yield, agricultural products or recreational value. Continental scale influences include drinking water supply, ground water recharging, irrigation water, hydroelectric power, flood control, traffic routes etc. In this paper I review evidence of alpine ecosystem responses to global change. It is emphasized that soil conservation is the centerpiece of any consideration of sustainable land use in alpine terrain. Complete vegetation cover of high biological diversity is essential to protect soils and secure `ecosystem services' in upland systems. It is illustrated that this is not necessarily in conflict with land use and... |
| Tipo: Journal article |
Palavras-chave: Altitude; Biodiversity; Climate; Conservation; Grazing; High elevation; Land use; Mountain. |
| Ano: 2000 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432000000100001 |
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| Barros,Michel J.F.; Silva-Arias,Gustavo A.; Segatto,Ana Lúcia Anversa; Reck-Kortmann,Maikel; Fregonezi,Jeferson N.; Diniz-Filho,José Alexandre F.; Freitas,Loreta B.. |
| Abstract Phylogenetic niche conservatism can be investigated at multiple scales on an explicit geographical context. Haplotype-based comparative analyses of lineages occupying the same region, and thus subjected to similar environmental factors, allow decoupling shared evolutionary and ecological patterns, as well as multiple dimensions of adaptive diversification. Here we aimed to assess the role of environmental drivers on diversification of subtropical grassland, based on haplotypic diversity of two plant genera. We sampled two closely related and co-distributed grassland plant genera, Petunia and Calibrachoa, across their entire distribution area. Eigenvectors extracted from pairwise distances based on chloroplast DNA haplotypes were used to fit... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Altitude; Climatic changes; Molecular diversification; Phylogenetic niche conservatism. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572020000400602 |
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| Costa,Luciana M.; Bergallo,Helena G.; Luz,Júlia L.; Esbérard,Carlos E. L.. |
| ABSTRACT We analyzed the bat assemblages found in protected areas in the state of Rio de Janeiro, Brazil, which is the best-sampled region of the Atlantic Forest. We selected 24 strict nature reserves and nine sustainable-use protected areas. We used data from inventories and complemented with data from the literature. We compared strict and sustainable-use protected areas, and tested whether the bat assemblages varied between habitat types. We tested the effect of geographic distance on the dissimilarity between bat assemblages, as well as the relationship between species composition and the size, mean altitude of the protected area, and capture effort. We compiled a total of 34,443 capture records, involving 67 species. Three species were captured only... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Altitude; Atlantic Forest; Chiroptera; Geographic distance; Types of habitat. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212020000100228 |
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| Espinoza-Navarro,O; Graú,S. |
| High altitude hypoxia is a stress that triggers several adaptive mechanisms, one of which is how the brain responds to lack of oxygen. The aim of this study was to determine changes in morphological and physiological patterns and in the attention capacity and perception in student populations from the highlands and from a sea level location. Eighty students, aged 14 to 16 years old, both sexes, from the Municipalities of Putre (3500 m.a.s.l.) and Arica (2 m.a.s.l.) participated in this study, with each group composed of 20 women and 20 men. After informed consent was obtained and with the students acceptance, parameters such as weight, height, BMI, heart rate, systolic and diastolic blood pressures were obtained. Subsequently, a psychometric test of... |
| Tipo: Journal article |
Palavras-chave: Altitude; Andean highlands; Attentional capacity; Psychometrics; Chile. |
| Ano: 2014 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000200036 |
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| Asirdizer,Mahmut; Tatlisumak,Ertugrul; Bora,Aydin; Tarhan,Serdar; Yilmaz Ovali,Gulgun; Hekimoglu,Yavuz; Kartal,Erhan; Keskin,Siddik. |
| Climatic and altitude features of living region may affect human body. Many changes in several tissues and organs and several health problems due to climatic and altitude effects were defined in the literature. However, there were limited number of studies which evaluated correlation between development of frontal sinus and climatic/altitude effect. In this study, widths, heights, AP lengths and volumes of frontal sinus were compared by Paranasal CT scans in populations living in Van which has colder climate and higher altitude and Manisa which has milder climate and lower altitude. It was found that widths, antero-posterior lengths and volumes of frontal sinus were higher in populations living in colder climate and higher altitude according to populations... |
| Tipo: Journal article |
Palavras-chave: Frontal Sinus; Paranasal CT scans; Altitude; Climate; Allen's Rule. |
| Ano: 2017 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000200031 |
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| Espinoza-Navarro,O; Diaz,J; Rodríguez,H; Moreno,A. |
| The aim of the study was to compare anthropometric and physiological patterns in a sample of 522 Aymara and non-Aymara individuals from Parinacota, Chile (3.700m). After signing voluntary informed consent forms, the residents were separated in two age groups. Groups A: 18 to 35 years, and Group B: 36 to 65 years, by sex and Aymara and non-Aymara ethnicity. The results of this study determined that anthropometric anteroposterior diameter (DAP) are higher in Aymara population. Biacromial diameter (DBA) is significantly lower in the Aymara population. Aymara males between 18 and 35 years are smaller than non-Aymara males. Aymara women had significantly lower heart rates. The respiratory rate is significantly lower in Aymara males and females from 18 to 35... |
| Tipo: Journal article |
Palavras-chave: Aymara; Altitude; Anthropometry; Physiological patterns. |
| Ano: 2011 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000100005 |
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| Moreno,Angel; Espinoza-Navarro,Omar. |
| The World Health Organization considers cigarette smoke as a major risk factor and causal agent of chronic obstructive pulmonary disease (COPD); however, smoke from biomass in poorly ventilated environments may be the major causative agent in developing countries. There is little epidemiological evidence of COPD in relation to the use of biomass fuels and altitude of the place of residence, and there is no record of the morphological and physiological characteristics of patients with COPD living at different altitudes. The objective of this research was to compare a) morphological characteristics: weight, height and body mass index (BMI) and b) physiological responses: spirometric record, heart rate, oxygen saturation and hemoglobin concentration in a... |
| Tipo: Journal article |
Palavras-chave: COPD; Altitude; Anthropometry; Elderly men; Chile. |
| Ano: 2013 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022013000200044 |
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| Lens, F.; Luteyn, J.L.; Smets, E.; Jansen, S.. |
| The ecological wood anatomy of 128 vaccinioid wood samples (including 115 species, 35 genera), collected between 39°S and 60°N latitude and 10 m to 3400 m altitude is studied. Several wood anatomical features within the subfamily, viz. tangential vessel diameter, average length of tracheary elements, height of multiseriate rays, and presence of prismatic crystals are negatively correlated with increasing latitude, while vessel density and helical thickenings show a positive correlation with increasing latitude. Similar latitudinal trends are found within the genus Vaccinium (31 species studied). The correlation between various wood anatomical features and latitude is surprisingly high despite the fact that most tropical species grow in montane regions,... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Altitude; Ecological and functional wood anatomy; Ericaceae; Latitude; Vaccinioideae; Vaccinium; 42.58. |
| Ano: 2004 |
URL: http://www.repository.naturalis.nl/record/424624 |
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| Landeiro,Victor L; Pepinelli,Mateus; Hamada,Neusa. |
| Taxonomically, blackflies (Simuliidae) are among the best-known aquatic insects in Brazil. However, information on their distribution is lacking for many regions. We sampled simuliids in 50 streams in the Chapada Diamantina region, State of Bahia, located in three distinct geographical areas, 20 at Lençóis, 18 at Mucugê, and 12 at Rio de Contas. We analyzed simuliid species richness and distribution in the Chapada Diamantina area as a whole, as well as in each of the three distinct geographical areas. We collected 20 species, three of which were not yet described and two were described after our sampling. The three areas are distinct in relation to environmental variables, mainly owing to differences in altitude and water pH. Four species were restricted... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Neotropical stream; Brazilian savanna; Altitude; PH. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2009000300006 |
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| Registros recuperados: 44 | |
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