Search results for " grass"
showing 10 items of 145 documents
Wet-up response of the microbial community is shaped by soil dry-down patterns
2015
Background/Question/Methods The massive soil CO2 efflux associated with rewetting dry soils after the dry summer period significantly contributes to the annual carbon budget of Mediterranean grasslands. Rapid reactivation of soil heterotrophic activity and available carbon are both required to fuel the CO2 pulse. Better understanding of the effects of altered summer precipitation on the metabolic state of indigenous microorganisms may be important in predicting future changes in carbon cycling. We investigated the effects of a controlled rewetting event on the soil CO2efflux pulse and on the present (DNA-based) and potentially active (rRNA-based) soil bacterial and fungal communities in int…
Responses of soil bacterial and fungal communities to extreme soil drought and rewetting
2013
Question: The patterns of resource allocation and activity of the soil microbial community over the dry summer in Mediterranean grasslands are still largely unknown. The microbial response to summer desiccation reflects adaptation strategies, setting the stage for a large rainfall-induced soil CO2 pulse upon rewetting, an important component of the ecosystem carbon budget. Methods: In three California annual grasslands, the present (DNA-based) and potentially active (RNA-based) soil bacterial and fungal communities were tracked over a summer season and in response to controlled rewetting of intact soil cores. Phylogenetic marker genes for bacterial (16S) and fungal (28S) RNA and DNA were se…
"'unlimn’d they disappear': The Ghostly Presence of Native Americans in Whitman’s Leaves of Grass"
2018
International audience
RISCHI E VIRTU’ DEL CONSUMO DI PESCE CRUDO
2013
Il consumo di pesce crudo in questo ultimo ventennio è notevolmente aumentato, ciò è dovuto non solo alle benefiche caratteristiche alimentari del pesce ma soprattutto alla moda di cui il consumatore è fortemente influenzato. Il pesce è una preziosa fonte di proteine, minerali e vitamine di alta qualità.
Acidi grassi ematici e infarto miocardico
2012
Immunological and ultrastructural characterization of spirotrichonymphid flagellates from Reticulitermes grassei and R. flavipes (syn. R. santonensis…
2006
AbstractFive species of spirotrichonymphids representing three genera have been studied by light and immunofluorescence microscopy, and by transmission electron microscopy. The genus Spirotrichonympha, represented by S. flagellata from Reticulitermes grassei, is characterized by a compound axostyle composed of several fibers or subaxostyles. The genus Spironympha, represented by S. kofoidi from Reticulitermes flavipes (syn. R. santonensis) and by the two new species S. verticis and S. lanceata, is characterized by flagellar lines restricted to the anterior area and a simple, tubular axostyle. Spironympha verticis and S. lanceata are mainly distinguished by ultrastructural details of their f…
Fine-grain beta diversity in Palaearctic open vegetation: variability within and between biomes and vegetation types
2021
Aims: To quantify how fine-grain (within-plot) beta diversity differs among biomes and vegetation types. Study area: Palaearctic biogeographic realm. Methods: We extracted 4,654 nested-plot series with at least four different grain sizes between 0.0001 m² and 1,024 m² from the GrassPlot database spanning broad geographic and ecological gradients. Next, we calculated the slope parameter (z-value) of the power-law species–area relationship (SAR) to use as a measure of multiplicative beta diversity. We did this separately for vascular plants, bryophytes and lichens and for the three groups combined (complete vegetation). We then tested whether z-values differed between biomes, ecological-physi…
Effetto del regime alimentare delle bovine sulla composizione in acidi grassi del formaggio Caciocavallo Palermitano
2008
Sono stati verificati gli effetti dell’alimentazione al pascolo e dell’integrazione con concentrato sulla composizione in acidi grassi (AG) del Caciocavallo Palermitano. Bovine di razza Cinisara suddivise in 4 gruppi sono state sottoposte ai trattamenti alimentari: PN: pascolo naturale; PMF: pascolo naturale e concentrato a base di mais e favino; POC: pascolo naturale e concentrato a base di orzo e cece; ST: fieno e concentrato in stalla. La dieta ha influenzato la produzione media di latte (P<0,05) e il suo tenore in grasso (P<0,05), ma non ha modificato la resa del latte alla caseificazione e la composizione chimica del formaggio. L’alimentazione al pascolo, con o senza il concentrato, ha…
Scale-dependent plant diversity in Palaearctic grasslands: a comparative overview
2016
Here we present an extensive overview of plant diversity values in Palaearctic grasslands for seven standard grain sizes from 0.0001 to 100 m². The data originate from 20 studies, including the Field Workshops of the Eurasian Dry Grassland Group (EDGG), ranging geographically from Spain in the west to Siberia in the east, from Sicily in the south to Estonia in the north and from the sea coast up to 3100 m a.s.l. The majority of data is from dry grasslands (Festuco-Brometea, Koelerio-Corynephoretea, Cleistogenetea squarrosae), but there are also some mesic, wet, saline, acidic, alpine and Mediterranean grasslands included. Among others, we compiled data from 1795 1-m², 1109 10-m² and 338 100…
Road verges provide alternative habitats for some, but not all, meadow plants
2021
Questions Agricultural intensification has led to the decline of biodiverse meadows and other semi-natural grasslands. Road verges offer potential alternative habitats for meadow species, but they may not be suitable for all meadow species due to different soil properties, frequent disturbances, pollution or suboptimal management. Are the communities of vascular plants and bryophytes similar or dissimilar to those in mown or grazed meadows? What kind of species are associated with road verges, mown meadows or grazed meadows? How do the habitat types differ in their soil conditions and disturbance intensity? Location The study was conducted on 36 sites in Central Finland. Methods We compared…