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Registros recuperados: 10
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BIOCHEMICAL PROPERTIES IN VASCULAR EPIPHYTES SUBSTRATE FROM A TEMPERATE FOREST OF CHILE R.C. Suelo Nutr. Veg.
Reyes,Francisco; Silvana,Zanetti; Espinosa,Alejandro; Marysol,Alvear.
The temperate forests of south-central Chile belong to the association Lapageria aextoxiconetum Oberdorfer vegetation, dominated by Aextoxicon punctatum R. et P., elderly and multi-layered, where the strata are emergent, dominant and co-dominant, shrub and herbaceous epiphytes. This work is the first report of measurements of some biochemical properties in samples from vascular epiphytes substrate in temperate forests. We evaluated the most frequent ecological situations: bifurcated trees (BT), dead standing trees (SDT) and medium gap border trees (MGBT), ES were compared with the surrounding soil forest land (SS) as control. The microbial biomass and enzyme activities of substrate were higher in ES of BT, situation probably due to optimal...
Tipo: Journal article Palavras-chave: Vascular epiphytes substrate; Enzymatic activities; Temperate forest.
Ano: 2010 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-27912010000200004
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Breeding system of Embothrium coccineum (Proteaceae) in two populations on different slopes of the Andes RChHN
ROVERE,ADRIANA E; SMITH-RAMÍREZ,CECILIA; ARMESTO,JUAN J; PREMOLI,ANDREA C.
Plant breeding systems are considered to reflect species' life history characteristics, selection due to biotic or abiotic factors, pollination conditions, or a combination of these. Reproductive systems may vary over ecological gradients. The breeding system of the ornithophilous Embothrium coccineum (Proteaceae) from temperate South America was studied by pollination treatments: manual self-pollination, manual cross-pollination, automatic self-pollination, and natural pollination. These treatments were conducted in a coastal western and an Andean eastern population. Embothrium coccineum was found to be self-incompatible and highly dependent on the pollinating agent at both sites. However, pollen limitations were greater in the coastal population, as...
Tipo: Journal article Palavras-chave: Self-incompatibility; Endemic species; Temperate forest.
Ano: 2006 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2006000200008
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Can we estimate forest gross primary production from leaf lifespan? A test in a young Fagus crenata forest OAK
Koyama, Kohei; Kikuzawa, Kihachiro.
It has been well established that leaf longevity is linked to the carbon economy of plants. We used this relationship to predict leaf lifetime carbon gains from leaf lifespan, and estimated the gross primary production (GPP) of a young deciduous forest of Japanese beech (Fagus crenata) located in central Japan. The light-saturated photosynthetic rates of the leaves were measured repeatedly during the growing season. We used the leaf lifespan to calculate the conversion coefficient from the light-saturated photosynthetic rate into the realized leaf lifetime carbon gain under field conditions. The leaf turnover rate was estimated using litter traps. GPP was estimated as the product of lifetime carbon gain per unit of leaf mass, and the annual leaf turnover...
Palavras-chave: Fagus crenata; Functional leaf longevity; Gross primary production; Mean labor time; Temperate forest.
Ano: 2016 URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4524
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Dung beetle communities: a neotropical-north temperate comparison Neotropical Entomology
Radtke,Meghan G; Fonseca,Cláudio R V da; Williamson,G Bruce.
Dung beetle communities have been compared across north temperate latitudes. Tropical dung beetle communities appear to be more diverse based on studies using different methodologies. Here, we present results from a standardized sampling protocol used to compare dung beetle communities across five neotropical forests in Brazil and Ecuador and two warm, north temperate forests in Mississippi and Louisiana. Species richness in the tropical forests was three to seven times higher than the temperate forests, as would be expected by studies of other taxa across tropical and temperate latitudes. Average body size in the temperate forests was larger than the tropical forests, as predicted by Bergmann's rule. Dung beetle abundance and volume per trap-day were...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Abundance; Diversity; Scarabaeidae; Temperate forest; Tropical forest.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2010000100004
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Dung decomposition and associated beetles in a fragmented temperate forest RChHN
BUSTAMANTE-SÁNCHEZ,MARCELA A.; GREZ,AUDREY A.; SIMONETTI,JAVIER A..
Habitat fragmentation may result in changes in species number and population abundance among habitats that differ in area, structure, or edge characteristics. These changes, in turn, may result in alterations in ecosystem process such as decomposition of organic matter. Through an experimental approach, we compared the beetles assemblages associated with dung and decomposition of cow feces in a continuous portion of Maulino forest, forest fragments and in pine plantations that surround this forest and forest remnants. Abundance and richness of dung-associated beetles were lower in forest fragments compared to the continuous forest and pine plantations. However, dung decomposition was similar in these three habitats. Beetle abundance, species richness and...
Tipo: Journal article Palavras-chave: Temperate forest; Fragmentation; Insects; Decomposition.
Ano: 2004 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2004000100009
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JUVENILE HEIGHT GROWTH RATES AND SORTING OF THREE NOTHOFAGUS SPECIES ON AN ALTITUDINAL GRADIENT Gayana Botánica
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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Leaf phenology and its associated traits in the wintergreen species Aristotelia chilensis (Mol.) Stuntz (Elaeocarpaceae) RChHN
DAMASCOS,MARÍA ANGÉLICA; PRADO,CARLOS HENRIQUE B.A..
The post-summer leaf demography of the wintergreen species Aristotelia chilensis growing near San Carlos de Bariloche, Argentina, is described. Its specific leaf mass (SLM, g m-2) is compared to that of the deciduous and evergreen species of the Andean-Patagonian forests and to that of other communities abroad. The pattern of leaf emergence is intermediate, with leaf flush in spring (basal cohort, BC), followed by successive unfolding of the remaining leaves (distal cohort, DC) during summer. The senescence of the BC occurs mainly in autumn, with a loss of 11-31 % of its SLM. The DC falls synchronously in mid-spring and the SLM loss in winter is 10-13 %. The SLM of A. chilensis (103.6 ± 6.2 g m-2) is intermediate when compared to the general mean values of...
Tipo: Journal article Palavras-chave: Deciduousness; Leaf life span; Specific leaf mass; Temperate forest; Wintergreen species.
Ano: 2001 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000400008
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Reduction of photosynthesis before midday depression occurred: leaf photosynthesis of Fagus crenata in a temperate forest in relation to canopy position and a number of days after rainfall OAK
Koyama, Kohei; Kikuzawa, Kihachiro.
We investigated an effect of canopy position and a number of days after rainfall on reduction of photosynthetic rate in a Fagus crenata forest in summer 2008, during days when midday depression was not apparent. We compared in situ photosynthetic rate and photosynthetic rate that was calculated by photosynthetic light response curves measured in the morning. The ratio, in situ photosynthesis divided by the curve-estimated value, declined towards the end of each day for the upper leaves, but not for the lower leaves. Total photosynthesis was reduced only for the upper leaves by 12% during 5 days after the rainfall.
Palavras-chave: Photosynthesis; Stomatal conductance; Net primary production; Temperate forest; Fagus crenata Blume.
Ano: 2011 URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4483
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Spatial patterns over a 24-year period show an increase in native vegetation cover and decreased fragmentation in Andean temperate landscapes, Chile Ciencia e Investigación Agraria
Petitpas,Robert; Ibarra,José Tomás; Miranda,Marcelo; Bonacic,Cristián.
R. Petitpas, J.T. Ibarra, M. Miranda, and C. Bonacic. 2016. Spatial patterns in a 24-year period show a case of increase forest cover and decrease fragmentation in Andean temperate landscapes, Chile. Cien. Inv. Agr. 43(3):384-395. Changes in landscape pattern were studied in a temperate landscape of the La Araucanía Region, Chile. Using aerial photographs from 1983 and 2007, we created land use/land cover maps. We then quantified the changes in composition and configuration by using landscape metrics and an adjacency matrix. By 2007, the dominant land cover had changed from agriculture to native vegetation. Residential areas showed the largest relative increase (670%) and had significant adjacency with native vegetation. The native vegetation increased by...
Tipo: Journal article Palavras-chave: Fragmentation; Landscape change; Native vegetation recovery; Temperate forest.
Ano: 2016 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202016000300004
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Use of tree species by White-throated treerunner (Pygarrhichas albogularis King) in a secondary native forest of southern Chile Iheringia, Sér. Zool.
Gantz,Alberto; Yañez,Miguel; Orellana,José I.; Sade,Soraya; Valdivia,Carlos E..
ABSTRACT In forest ecosystems, numerous species of insectivorous birds use certain tree species as feeding and nesting substrates. Between 2009 and 2010, the use of different floristic components as feeding substrate by the Pygarrhichas albogularis King, 1831 was evaluated in a southern Chilean secondary native forest. From a total of 13 trees and bush species, six tree species were used by P. albogularis as a feeding substrate. Tree use was limited to intermediate heights (11-20 m) and, mainly, to the trunk (40% of observations) and secondary branches (26%). Pygarrhichas albogularis showed a disproportionated use of N. dombeyi and an important use of trees with a greater age structure (DBH 81-100 cm). Nothofagus dombeyi presented a significantly greater...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Temperate forest; Chile; White-throated Treerunner; Floristic use.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212015000200193
Registros recuperados: 10
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