Search results for "81"
showing 10 items of 2468 documents
Músicas alternativas. Sobre formas de gestionar y producir músicas durante la década de 1980 en Córdoba- Argentina
2021
Fernández Asperilla, Ana; Alba, Susana (2020). Emigrar después de la crisis. Crecimiento económico y nueva migración española
2021
La producción fluida. El almacén como forma logística en la nueva era industrial
2021
Comparison of quantitative Holocene temperature reconstructions using multiple proxies from a northern boreal lake
2017
Four biotic proxies (plant macrofossils, pollen, chironomids and diatoms) are employed to quantitatively reconstruct variations in mean July air temperatures ( Tjul) at Lake Loitsana (northern Finland) during the Holocene. The aim is to evaluate the robustness and biases in these temperature reconstructions and to compare the timing of highest Tjul in the individual reconstructions. The reconstructed Tjul values are evaluated in relation to local-scale/site-specific processes associated with the Holocene lake development at Loitsana as these factors have been shown to significantly influence the fossil assemblages found in the Lake Loitsana sediments. While pollen-based temperatures follow…
Intercomparison of methods to estimate gross primary production based on CO2 and COS flux measurements
2022
Separating the components of ecosystem-scale carbon exchange is crucial in order to develop better models and future predictions of the terrestrial carbon cycle. However, there are several uncertainties and unknowns related to current photosynthesis estimates. In this study, we evaluate four different methods for estimating photosynthesis at a boreal forest at the ecosystem scale, of which two are based on carbon dioxide (CO2) flux measurements and two on carbonyl sulfide (COS) flux measurements. The CO2-based methods use traditional flux partitioning and artificial neural networks to separate the net CO2 flux into respiration and photosynthesis. The COS-based methods make use of a unique 5…
Latvijas Vēstures Institūta Žurnāls. 2009, Nr. 1 (70)
2009
Conciencia histórica y comunidad política
2020
LA SICILIA E LE SUE COSTITUZIONI (1812, 1848, 1860, 1946)
2020
1806-1815: dieci anni che incidono profondamente nella storia della Sicilia. Segnato dall'alleanza anglo-siciliana contro Napoleone e dall'arrivo di tanti soldati e mercanti inglesi nell'isola mediterranea, il Decennio inglese contribuisce a «modernizzare» vari aspetti della realtà siciliana: dalla sfera politico-istituzionale con il «laboratorio politico» in cui nasce la Costituzione siciliana del 1812 alle attività economiche, commerciali e finanziarie con l'inserimento dell'isola nell'orbita inglese durante il Blocco continentale, dal campo sociale alla vita culturale con stimolanti raffronti, dalle strutture difensive all'ambito religioso con proficui innesti. Il Decennio inglese in Sic…
Parasite infection alters host stable-isotope composition under controlled feeding
2016
1) Stable isotopes are widely used for studying trophic relationships, but variation driven by environmental conditions or food availability complicates the interpretation of trophic dynamics. Parasites are ubiquitous and known to affect physiological functions of their hosts, but only few studies have assessed the effects of parasites on isotope composition of hosts. 2) We measured the changes in two of the most commonly used stable isotopes in food-web studies, nitrogen (i.e. 15N:14N ratio; denoted as δ15N) and carbon (13C:12C; δ13C) in Daphnia hosts exposed to infection by a parasitic micosporidian in the laboratory. Isotopic signatures of hosts fed a standardised controlled diet were co…
Grasslands of Northern Europe and the Baltic States
2020
This chapter deals with the grasslands of Northern Europe (Denmark, Faroe Islands, Finland, Iceland, Norway, Sweden) and the Baltic States (Estonia, Latvia, Lithuania), with a focus on natural and semi-natural grasslands of the lowlands, thus treating arctic-alpine and strongly intensified types only marginally. At present, grasslands cover ca. 7% of the study region, half of which are natural grasslands (mostly arctic-alpine, to a smaller extent also azonal and extra-zonal) and the other half secondary grasslands created by human land use (livestock grazing or haymaking). Both grassland categories have high importance for biodiversity in many taxa. However, particularly the secondary grass…