2,395 research outputs found
Are tree roots in the canopy ecologically important? A critical reassessment from a case study in a tropical montane rainforest
No full textBackground: The occurrence of adventitious roots in the crowns of rainforest trees has been reported occasionally. These roots have been suggested to serve as an ecological mechanism that increases nutrient supply to trees. Aim: We investigated the biomass and ecomorphology of tree fine roots in the canopy and in the terrestrial soil in a nutrient-poor montane rainforest in Costa Rica. Methods: Crown humus and terrestrial soil organic layer samples were analysed for tree fine root mass, root morphology and chemical properties. We surveyed crown humus abundance and quantitatively estimated the stand's tree fine root biomass in the canopy. Results: Soil chemical properties were similar in crown humus and terrestrial organic layer samples. Fine root biomass density and live-to-dead ratio were higher in the terrestrial soil than in the crown humus. Tree fine roots in the canopy represented less than 0.1% of the fine root biomass in the terrestrial organic layer. Canopy roots completely lacked ectomycorrhizal colonisation, while terrestrial fine roots were entirely colonised. Conclusions: The negligible biomass of adventitious fine roots in the canopy clearly suggests that the ecological benefit from canopy roots for the host tree must be marginal even under particularly poor growth conditions.German Research Foundation (DFG
Reptricket. Förord till Lars Gustafsson: Mot noll
No full textIntroduction to a collection of philosophical essays by Swedish author Lars Gustafsson (b. 1936)
Author Functions in Lars Kepler\u27s The Hypnotist: An Analysis
No full textThis paper examines Foucault\u27s notion of the author function as it pertains to Lars Kepler\u27s bestselling 2011 crime thriller, The Hypnotist. Lars Kepler is the pseudonym of a Swedish husband-wife writing duo, making him the perfect subject for analysis centering on illusory notion of the author. This paper will answer these questions: Who is the true author of The Hypnotist? What factors influence the author function of this bestelling novel? And what can The Hypnotist phenomenon tell us about the relationships between authors and their readers? This paper will demonstrate that no literary works may be ascribed to an individual person, and that authors hold no privileged knowledge of the works they produce, because authors cease to be authors the moment pen is lifted from page
Mycorrhizal, Endophytic and Ecomorphological Status of Tree Roots in the Canopy of a Montane Rain Forest
No full textOur investigation provides data on the symbiotic status and the functional morphology of tree fine roots in canopy soils of an upper montane forest in Costa Rica. Canopy roots completely lacked mycorrhizal colonization, but showed a high abundance of endophytic fungi suggesting a reduced ability for nutrient acquisition compared with terrestrial roots
Ca/calmodulin dependent kinase II (CaMKII) contributes to disordered Ca homeostasis during doxorubicin treatment
No full textCa/calmodulin dependent kinase II (CaMKII) contributes to disordered Ca homeostasis during doxorubicin treatment
No full text”Lärda nyheter” i Peter Hernquists korrespondens till Carl von Linné och Abraham Bäck - med kommentarer och utvikningar
No full textI detta Meddelande nr 55 från Veterinärhistoriska museet har författaren - professor emeritus Lars-Erik Appelgren - gjort ett urval av den korrespondens som Peter Hernquist hade med sina mentorer Carl von Linné och Abraham Bäck under sin vistelse i Frankrike, varvid ”Lärda nyheter” varit en ledstjärna för urvalet. Speciellt har breven till Bäck försetts med författarens personliga kommentarer men även kompletterats med faktaupplysningar från andra källor än breven om berörda nyheter. För att underlätta läsningen har dessa kommentarer omgetts med enkelkonturerad och utvikningarna med dubbelkonturerad ram. Lars-Erik Appelgren har inte bara genom sitt veterinärhistoriska författarskap utan också genom att ställa sina fackliga kunskaper och sin eminenta estetiska läggning till förfogande gjort Veterinärhistoriska museet ovärderliga tjänster. Det är med stor glädje jag noterar att region Uppsala nyligen visat sin uppskattning genom att tilldela Lars-Erik sitt Medicinhistoriska stipendium med motiveringen att de vill ”lyfta fram ett viktigt men ofta förbisett område inom medicinhistorien: veterinärmedicinen”. Med de varmaste gratulationer
Biomass and water storage dynamics of epiphytes in old-growth and secondary montane cloud forest stands in Costa Rica
No full textEpiphytic biomass, canopy humus and associated canopy water storage capacity are known to vary greatly between old-growth tropical montane cloud forests but for regenerating forests such data are virtually absent. The present study was conducted in an old-growth cloud forest and in a 30-year-old secondary forest (SF) on wind-exposed slopes in the Cordillera de Tilarain (Monteverde area) in northern Costa Rica. Epiphytic vegetation in both forests was dominated by bryophytes. Epiphyte mat weight (epiphyte biomass and canopy humus) at the stand level was 1,035 kg ha(-1) in the SF and 16,215 kg ha(-1) in the old-growth forest (OGF). The water contents of epiphytic bryophytes in the OGF were determined gravimetrically in situ and showed maximum values of 418% +/- 74 (SD)% of dry weight and minimum values of 36% +/- 10 (SD)%. Maximum stand water storage of non-vascular epiphytes and canopy humus at Monteverde was estimated at 0.36 mm for the SF and 4.95 mm for the OGF. Epiphytic bryophytes exhibited more dynamic wetting and drying cycles compared to canopy humus. Maximum water loss through evaporation was 251% of dry weight (bryophytes) and 117% of dry weight (canopy humus) within 3 days of sunny weather without precipitation. Despite the high potential water storage capacity of epiphytic bryophytes and canopy humus the actually available storage is likely to be much smaller depending on antecedent rainfall and evaporative conditions
Interpreting Wage Bargaining Norms
No full textFrom the mid-1990s onwards, Swedish wage bargaining has been characterised by informal co-ordination of the wage claims of big unions and bargaining cartels. In particular, it has been understood that the manufacturing sector should lead by first agreeing on a pay increase, whereafter the service sector and public sector unions choose a similar increase. We analyse his setup with two possible theoretical interpretations: (i) the manufacturing sector as a tackelberg leader and (ii) a normative role for the manufacturing sector’s pay increase, upported either by unmodelled social pressure or a modeled loss aversion (envy) of the heltered sector unions. The conclusion of the analysis is that the normative or leading role of one sector – in the Swedish case the manufacturing sector – can potentially bring big benefits for employment and output. Generalising an idea suggested by Lars Calmfors and Anna Larsson, our analysis also generates a rudimentary theory of why the wage increase norm sometimes binds and sometimes not. A comparison of the model predictions and the observed outcomes of the last five wage bargaining rounds in Sweden suggests that the model is generally consistent with the empirical observations: wage moderation and norm observance are stronger when the manufacturing industry’s initial relative wage is low.wage bargaining; bargaining co-ordination
Dan Andersson
No full textSpecial feature issue on the Swedish author Dan Andersson, with articles by Anders Hallengren, Nisse Munck, Lars Furuland, Lars Järnemo (2), Gösta Ågren, Inge Mattsson, Arne Säll, and Bure Holmbäck.</p
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