Search results for "580"

showing 10 items of 858 documents

Annual pollen traps reveal the complexity of climatic control on pollen productivity in Europe and the Caucasus

2010

Annual PAR (pollen accumulation rates; grains cm−2 year−1) were studied with modified Tauber traps situated in ten regions, in Poland (Roztocze), the Czech Republic (two regions in Krkonoše, two in Šumava), Switzerland (4 regions in the Alps), and Georgia (Lagodekhi). The time-series are 10–16 years long, all ending in 2007. We calculated correlations between pollen data and climate. Pollen data are PAR summarized per region (4–7 traps selected per region) for each pollen type (9–14 per region) using log-transformed, detrended medians. Climate data are monthly temperature and precipitation measured at nearby stations, and their averages over all possible 2- to 6-month windows falling within…

570010506 paleontologyArcheology010504 meteorology & atmospheric sciencesEarth Sciences; Archaeology; Anthropology; Climate Change ; Biogeosciences; PaleontologyClimate changePlant Science580 Plants (Botany)medicine.disease_cause01 natural sciencesPollenmedicineAlnus viridisCyperaceae0105 earth and related environmental sciencesbiologyEcologyPalaeontologyPaleontology15. Life on landSeasonalitybiology.organism_classificationmedicine.diseaseGeographyProductivity (ecology)Pollen monitoring; Annual pollen accumulation; Influx; Climate; Europe; Caucasus13. Climate actionPhysical geographyLarchWoody plantVegetation History and Archaeobotany

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Allopolyploidisation in a geological collision zone: on the origin of the tetraploid Anthemis cupaniana Nyman (Compositae, Anthemideae) in Sicily

2022

AbstractThe genus Anthemis has a circum-Mediterranean distribution and comprises c. 175 annual, biennial, and perennial species with polyploid species and species complexes found in its section A. sect. Hiorthia. In Sicily, the genus is represented by 13 species, one of these being the tetraploid A. cupaniana, which is endemic to the island and is distributed throughout the limestone mountains at elevations between 500 and 1800 m a.s.l. Discordant positions in phylogenetic trees based on two plastid regions (psbA-trnH and trnC-petN) and on one nuclear marker (nrDNA ITS1 + 5.8S + ITS2) reveal that the species is of allopolyploid origin, with the maternal parent from the species group around …

580 Pflanzen (Botanik)Asteraceae · Biogeography · Miocene · Pleistocene · Polyploidy · Sicilian channel · Speciation570 Biowissenschaften Biologieddc:580Plant Scienceddc:570Ecology Evolution Behavior and SystematicsAsteraceae Biogeography Miocene Pleistocene Polyploidy Sicilian channel Speciation

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Live imaging of developmental processes in a living meristem of Davidia involucrata (Nyssaceae)

2014

Morphogenesis in plants is usually reconstructed by scanning electron microscopy and histology of meristematic structures. These techniques are destructive and require many samples to obtain a consecutive series of states. Unfortunately, using this methodology the absolute timing of growth and complete relative initiation of organs remain obscure. To overcome this limitation, an in vivo observational method based on Epi-Illumination Light Microscopy (ELM) was developed and tested with a male inflorescence meristem (floral unit) of the handkerchief tree Davidia involucrata Baill. (Nyssaceae). We asked whether the most basal flowers of this floral unit arise in a basipetal sequence or, altern…

580 Pflanzen (Botanik)in vivoDavidia involucrataepi-illumination light microscopy (ELM)fungifloral unit meristem (FU meristem)food and beveragesmorphogenesisNyssaceaePlant Sciencelive imaging580 Botanical sciencesFrontiers in Plant Science

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A conspectus of Tephroseris (Asteraceae: Senecioneae) in Europe outside Russia and notes on the decline of the genus

2021

Tephroseris is generally considered a difficult genus. Based on the examination of extensive herbarium material and considering the existing literature, we recognize seven species in Europe outside Russia. These are T. palustris, T. integrifolia with subsp. integrifolia, subsp. aurantiaca, subsp. capitata, subsp. maritima, subsp. serpentini and subsp. “tundricola”, T. balbisiana, T. crispa, T. helenitis, T. longifolia and T. papposa. Phylogenetic analysis of ITS and ETS sequences showed that these species fall into three lineages. These are: (1) T. palustris, clearly related to Arctic species of the genus; (2) T. integrifolia; and (3) the remaining species. Molecular dating of the T. integr…

580CompositaebiologyLineage (evolution)habitat lossWilldenowiaPlant ScienceSenecioneaeAsteraceaeAsteraceaebiology.organism_classificationEuropeHerbariumGeographyTephroserisGenus500 Naturwissenschaften und Mathematik::580 Pflanzen (Botanik)::580 Pflanzen (Botanik)CapitataBotanyglacial relicEcology Evolution Behavior and Systematicsglobal changeETS

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Microplastic incorporation into soil in agroecosystems

2017

Background: We live in a plastic age (Thompson et al., 2009), with microplastic (typically defined as plastic particles < 5 mm) becoming an increasingly appreciated aspect of environmental pollution. Research has been overwhelmingly focused on aquatic systems, especially the oceans, but there is a current shift to more strongly consider terrestrial ecosystems (Rillig, 2012; Horton et al., 2017). In particular agroecosystems are coming into focus as a major entry point for microplastics in continental systems (Nizzetto et al., 2016b), where contamination might occur via different sources as sludge amendment or plastic mulching (Steinmetz et al., 2016). Given the central role of agroecosystem…

580OpinionAgroecosystemSoil aggregationMicroplasticNanoplasticSoil biotaPlant SciencePorosityContaminant transportTillageSettore AGR/02 - Agronomia E Coltivazioni Erbacee

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