| transpiration of urban forests in the los angeles metropolitan area. | despite its importance for urban planning, landscape management, and water management, there are very few in situ estimates of urban-forest transpiration. because urban forests contain an unusual and diverse mix of species from many regions worldwide, we hypothesized that species composition would be a more important driver of spatial variability in urban-forest transpiration than meteorological variables in the los angeles (california, usa) region. we used constant-heat sap-flow sensors to moni ... | 2011 | 21639035 |
| photosynthesis, chloroplast pigments, and antioxidants in pinus canariensis under free-air ozone fumigation. | high o3 levels, driving uptake and challenging defense, prevail on the canary islands, being associated with the hot and dry summers of the mediterranean-type climate. pinus canariensis is an endemic conifer species that forms forests across these islands. we investigated the effects of ozone on photosynthesis and biochemical parameters of p. canariensis seedlings exposed to free-air o3 fumigation at kranzberg forest, germany, where ambient o3 levels were similar to those at forest sites in the ... | 2009 | 19000645 |
| population divergence for heteroblasty in the canary island pine (pinus canariensis, pinaceae). | a heteroblastic (or vegetative phase) change is an abrupt manifestation in the general heteroblastic development during the ontogeny of plants. the canary island pine undergoes an especially marked and delayed heteroblastic change, including both the formation of secondary needles on dwarf shoots and the onset of preformed growth. to assess genetic and environmental effects on the heteroblastic change in this species, we followed plants from 19 populations at a dry site and a wetter site. compar ... | 2006 | 21642146 |
| enzymes of glyoxylate in conifers. | the high level of lipids in seeds of some species of conifers suggested that the glyoxylate cycle might have a role in conifer seed metabolism.six species (pinus pinea, pinus pinaster, pinus canariensis, pinus strobus, abies alba, and cupressus sempervirens) were investigated for their lipid content and malate synthase and isocitrate lyase level. the fatty acid composition of the triglyceride fraction was also investigated. the correlation between lipid content of germinating seed with the prese ... | 1968 | 16656892 |
| nitrate uptake improvement by modified activated carbons developed from two species of pine cones. | activated carbons from two species of pine cones (pinus canariensis and cupressus sempervirens) were prepared by phosphoric acid activation and tested for the removal of nitrate ions from aqueous solution. to investigate the feasibility of improving their nitrate adsorption capacity, two different post-treatments—a thermal treatment and a treatment with saturated urea solution—were also applied to the prepared activated carbons. comparison of the treated and untreated activated carbons showed th ... | 2015 | 25460695 |
| chloroplast microsatellites reveal colonization and metapopulation dynamics in the canary island pine. | chloroplast microsatellites are becoming increasingly popular markers for population genetic studies in plants, but there has been little focus on their potential for demographic inference. in this work the utility of chloroplast microsatellites for the study of population expansions was explored. first, we investigated the power of mismatch distribution analysis and the f(s) test with coalescent simulations of different demographic scenarios. we then applied these methods to empirical data obta ... | 2006 | 16911194 |
| respiratory fluxes in a canary islands pine forest. | we estimated component and whole-ecosystem co(2) efflux (r(eco)) in a pinus canariensis chr. sm. ex dc stand in tenerife, canary islands, an ecotone with strong seasonal changes in soil water availability. from november 2006 to february 2008, we measured foliage, stem and soil co(2) efflux by chamber techniques. site-specific co(2) efflux models obtained from these chamber measurements were then combined with half-hourly measurements of canopy, stem and soil temperature as well as soil water pot ... | 2009 | 19324703 |
| quantification of ozone uptake at the stand level in a pinus canariensis forest in tenerife, canary islands: an approach based on sap flow measurements. | ozone uptake was studied in a pine forest in tenerife, canary islands, an ecotone with strong seasonal changes in climate. ambient ozone concentration showed a pronounced seasonal course with high concentrations during the dry and warm period and low concentrations during the wet and cold season. ozone uptake by contrast showed no clear seasonal trend. this is because canopy conductance significantly decreased with soil water availability and vapour pressure deficit. mean daily ozone uptake aver ... | 2006 | 16457921 |
| accumulating pollutants in conifer needles on an atlantic island - a case study with pinus canariensis on tenerife, canary islands. | concentrations of potential pollutant elements na, cl, and s were investigated in needles of pinus canariensis grown at 55 field plots in tenerife. microelement concentrations (including heavy metals) were measured at a subset of 18 plots. na and cl concentrations were high at low elevations (up to 8 mg g(-1) cl and 5.5 mg g(-1) na). na/cl ratio close to standard seawater indicated sea spray influence up to 1200 m a.s.l. only at few plots, sulphur concentrations indicated possible pollutant impa ... | 2005 | 15862394 |
| testing phylogeographic predictions on an active volcanic island: brachyderes rugatus (coleoptera: curculionidae) on la palma (canary islands). | volcanic islands with well-characterized geological histories can provide ideal templates for generating and testing phylogeographic predictions. many studies have sought to utilize these to investigate patterns of colonization and speciation within groups of closely related species across a number of islands. here we focus attention within a single volcanic island with a well-characterized geological history to develop and test phylogeographic predictions. we develop phylogeographic predictions ... | 2006 | 16448412 |
| complex population genetic structure in the endemic canary island pine revealed using chloroplast microsatellite markers. | the canary archipelago, located on the northwestern atlantic coast of africa, is comprised of seven islands aligned from east to west, plus seven minor islets. all the islands were formed by volcanic eruptions and their geological history is well documented providing a historical framework to study colonization events. the canary island pine ( pinus canariensis c. sm.), nowadays restricted to the westernmost canary islands (gran canaria, tenerife, la gomera, la palma and el hierro), is considere ... | 2003 | 14523525 |
| headspace-single drop microextraction (hs-sdme) in combination with high-performance liquid chromatography (hplc) to evaluate the content of alkyl- and methoxy-phenolic compounds in biomass smoke. | the content of ten phenolic compounds present in four different biomass smoke materials: rock rose (cistus monpelienisis), prickly pear (opuntia ficus indica), pine needles (pinus canariensis), and almonds skin (prunus dulcis), have been evaluated. the sampling method mainly consisted of a trap alkaline solution to solubilize the phenols, and was optimized by an experimental design. average sampling efficiencies of 78.1% and an average precision value of 10.6% (as relative standard deviation, rs ... | 2011 | 21807181 |
| colonization and diversification of the species brachyderes rugatus (coleoptera) on the canary islands: evidence from mitochondrial dna coii gene sequences. | the genus brachyderes schönherr (coleoptera: curculionidae) is represented by the species b. rugatus wollaston on the canary islands, with one subspecies on each of the islands of gran canaria, tenerife, la palma, and el hierro. these four subspecies are associated with the endemic pine tree pinus canariensis, and their distributions are broadly coincident. eighty-eight individual canarian brachyderes, sampled from across the distributions of each subspecies, have been sequenced for 570 bp of th ... | 2000 | 10937264 |
| greek pinus essential oils: larvicidal activity and repellency against aedes albopictus (diptera: culicidae). | the needle volatiles metabolites of seven pinus spp.: pinus nigra (3 samples), pinus stankewiczii, pinus brutia, pinus halepensis, pinus canariensis, pinus pinaster and pinus strobus from greece were determined by gas chromatography and gas chromatography-mass spectrometry. p. nigra and p. canariensis essential oils were dominated by α-pinene (24.9-28.9 % and 15 %, respectively) and germacrene d (20.3-31.9 % and 55.8 %, respectively), whereas p. brutia and p. strobus by α-pinene (20.6 % and 31.4 ... | 2015 | 25399814 |
| [effect of cryopreservation on pollen viability]. | the viability of pollen at room temperature lowers and disappears in few days; on the contrary the cryopreservation lengthens the pollen viability. pollen of pinus brutia, p. canariensis, p. halepensis, p. pinaster has been stored at -20 degrees c for one year with the aim of checking the variation of viability. the viability has been tested by fluorescein diacetate; the germination by in vitro culture for 96 hours has been observed and daily percentage of germinated pollen grains and maximum le ... | 1990 | 2073382 |
| automatic identification and characterization of radial files in light microscopy images of wood. | analysis of anatomical sections of wood provides important information for understanding the secondary growth and development of plants. this study reports on a new method for the automatic detection and characterization of cell files in wood images obtained by light microscopy. to facilitate interpretation of the results, reliability coefficients have been determined, which characterize the files, their cells and their respective measurements. | 2014 | 24989783 |