| 1. |
- Ask, Jenny, 1976-, et al.
(författare)
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Terrestrial organic matter and light penetration : Effects on bacterial and primary production in lakes
- 2009
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Ingår i: Limnology and Oceanography. - : American Society of Limnology and Oceanography, Inc.. - 0024-3590 .- 1939-5590. ; 54:6, s. 2034-2040
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Tidskriftsartikel (refereegranskat)abstract
- We investigated productivity at the basal trophic level in 15 unproductive lakes in a gradient ranging from clear-water to brown-water (humic) lakes in northern Sweden. Primary production and bacterial production in benthic and pelagic habitats were measured to estimate the variation in energy mobilization from external energy sources (primary production plus bacterial production on allochthonous organic carbon) along the gradient. Clear-water lakes were dominated by autotrophic energy mobilization in the benthic habitat, whereas humic lakes were dominated by heterotrophic energy mobilization in the pelagic habitat. Whole-lake (benthic + pelagic) energy mobilization was negatively correlated to the light-extinction coefficient, which was determined by colored terrestrial organic matter in the lake water. Thus, variation in the concentration of terrestrial organic matter and its light-absorbing characteristics exerts strong control on the magnitude, as well as on the processes and pathways, of energy mobilization in unproductive lakes. We suggest that unproductive lakes in general are sensitive to input of terrestrial organic matter because of its effects on basal energy mobilization in both benthic and pelagic habitats.
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| 2. |
- Ask, Jenny, 1976-, et al.
(författare)
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Whole-lake estimates of carbon flux through algae and bacteria in benthic and pelagic habitats of clear-water lakes
- 2009
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Ingår i: Ecology. - Washington, DC, USA : Ecological Society of America. - 0012-9658 .- 1939-9170. ; 90:7, s. 1923-1932
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Tidskriftsartikel (refereegranskat)abstract
- This study quantified new biomass production of algae and bacteria in both benthic and pelagic habitats of clear-water lakes to contrast how carbon from the atmosphere and terrestrial sources regulates whole-lake metabolism. We studied four small unproductive lakes in subarctic northern Sweden during one summer season. The production of new biomass in both benthic and pelagic habitats was calculated as the sum of autotrophic production by algae and heterotrophic production by bacteria using allochthonous organic carbon (OC). Whole-lake production of new biomass was dominated by the benthic habitat (86% +/- 4% [mean +/- SD]) and by primary production (77% +/- 9%). Still, heterotrophic bacteria fueled by allochthonous OC constituted a significant portion of the new biomass production in both benthic (19% +/- 11%) and pelagic habitats (51% +/- 24%). In addition, overall net production (primary production minus respiration) was close to zero in the benthic habitats but highly negative (-163 +/- 81 mg C.m(-2).d(-1)) in pelagic regions of all lakes. We conclude (1) that allochthonous OC supported a significant part of total production of new biomass in both pelagic and benthic habitats, (2) that benthic habitats dominated the whole-lake production of new biomass, and (3) that respiration and net CO2 production dominated the carbon flux of the pelagic habitats and biomass production dominated the benthic carbon flux. Taken together, these findings suggest that previous investigations have greatly underestimated the productivity of clear-water lakes when benthic autotrophic production and metabolism of allochthonous OC have not been measured.
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| 3. |
- Jansson, Jenny, 1979-
(författare)
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Constructing Disciplined Workers - Managing Identity Formation in the Early Swedish Trade Unions
- 2009
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Class identity and mobilization constitute important factors for the understanding of the development and sustainability of the welfare state; therefore these issues are thoroughly studied within the social sciences. However, prior research has primarily assigned technical developments in the industry to be the driving force of class mobilization. I claim that to fully understand class formation and trade unionism, the variable identity must be considered since organizational identity is crucial for organizations in general and, I claim, for trade unions in particular because of their nature as voluntary organizations being vulnerable to membership losses. Marx stated that a class in itself does not necessarily lead to class for itself; the trade union leaders need to construct the cohesive glue of identity. This paper aims at examining the role of trade union leaders in the construction of a strong cohesive identity in the Swedish Trade Union Confederation for blue collar workers, the LO, in the 1920s and 1930s. Based on a study of historical documents I argue that the LO constructed a strong reformist and consensus focused identity with its roots in social democracy. Through image management they managed to implement this image on the grass root level in Sweden in the 1930s using the newly established educational system. The Swedish case is particularly interesting because Swedish trade unionism is characterized by highly organized and disciplined workers; if organizational identity in trade unions is a result of deliberate identity politics from trade union leaders we would find support for that in this particular case. Most research on trade unions in Sweden has dealt with the elites of the organizations and their road towards consensus and cooperation with the employers assuming discipline and class formation, thus the process of identity construction within the trade unions is yet to be examined. By filling this gap we can improve our understanding of how the working class of Sweden could be formatted into a strong cohesive actor in the 1930s and how the spirit of consensus became a characteristic and important feature of the Swedish labour market.
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| 4. |
- Jansson, Jenny, 1979-
(författare)
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Paving the way for the Class Compromise : Constructing Consensus Identity in the Early Swedish Trade Union
- 2009
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Most research on the Basic Agreement between the LO and the SAF that was closed in Saltsjöbaden in 1938 has dealt with the elites of the organizations and their road towards consensus and cooperation. I claim that the success of the agreement cannot be fully understood without integrating the grass roots in the analysis, an aspect that has been largely ignored. The grass roots could easily have overthrown the agreement through strikes but instead the Agreement gained support among the members. I argue that the LO constructed a collective identity compatible with this new relationship to capital, and by doing that the organization could implement the consensus spirit on the grass root level and discipline the members. A systematic in-depth analysis of the trade union educational material clearly shows that the LO constructed an identity of the organization that mirrored the new relation between labour and capital. The trade union member was a true reformist person that put a lot of value in following rules adopted democratically by the organization and the LO was a constantly growing politically important force. The employers were depicted as close friends to the workers while the political right because of their attempts to meddle in the labour market through legislation was an enemy. Another enemy was the SAC, the syndicalists that were demonized as irresponsible and irrational, an organization without clear goals; the SAC was everything the LO was not. The Basic Agreement and the identity politics pursued by the LO are not only important components for explaining the development of the Swedish model, they also reflect the formation of the Swedish labour movement into one strong, centralized, cohesive actor that came to play an important role in the development of the Swedish welfare state.
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| 5. |
- Karlsson, Jan, et al.
(författare)
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Light limitation of nutrient-poor lake ecosystems
- 2009
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Ingår i: Nature. - : Springer Science and Business Media LLC. - 0028-0836 .- 1476-4687. ; 460, s. 506-509
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Tidskriftsartikel (refereegranskat)abstract
- Productivity denotes the rate of biomass synthesis in ecosystems and is a fundamental characteristic that frames ecosystem function and management. Limitation of productivity by nutrient availability is an established paradigm for lake ecosystems1, 2, 3. Here, we assess the relevance of this paradigm for a majority of the world's small, nutrient-poor lakes, with different concentrations of coloured organic matter4, 5. By comparing small unproductive lakes along a water colour gradient, we show that coloured terrestrial organic matter controls the key process for new biomass synthesis (the benthic primary production) through its effects on light attenuation. We also show that this translates into effects on production and biomass of higher trophic levels (benthic invertebrates and fish). These results are inconsistent with the idea that nutrient supply primarily controls lake productivity, and we propose that a large share of the world's unproductive lakes, within natural variations of organic carbon and nutrient input, are limited by light and not by nutrients. We anticipate that our result will have implications for understanding lake ecosystem function and responses to environmental change. Catchment export of coloured organic matter is sensitive to short-term natural variability and long-term, large-scale changes, driven by climate and different anthropogenic influences6, 7. Consequently, changes in terrestrial carbon cycling will have pronounced effects on most lake ecosystems by mediating changes in light climate and productivity of lakes.
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| 6. |
- Karlsson, Jan, 1969-, et al.
(författare)
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Winter respiration of allochthonous and autochthonous organic carbon in a subarctic clear-water lake
- 2008
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Ingår i: Limnology and Oceanography. - : American Society of Limnology and Oceanography. - 0024-3590 .- 1939-5590. ; 53:3, s. 948-954
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Tidskriftsartikel (refereegranskat)abstract
- We studied a small subarctic lake to assess the magnitude of winter respiration and the organic carbon (OC) source for this respiration. The concentration and stable isotopic composition (d13C) of dissolved inorganic carbon (DIC) accumulating in the lake water under ice was analyzed over one winter (7 months). The DIC concentration increased and the d13C of DIC decreased over time, with the greatest changes at the lake bottom. Winter respiration was 26% of annual respiration in the lake. Keeling plot analysis demonstrated that the d13C of respired DIC varied spatially, high d13C values occurring at shallow (2.5 m, 21.7‰) compared with intermediate (4 m, 25.1‰) and deep (6 m, 27.8‰) locations in the lake. The variation in the d13C of respired DIC was related to the variation in the d13C of the sediments between locations, suggesting that sediment OC supported much of the winter respiration and that the dominant OC source for respiration was OC from benthic algae at shallow locations and settled OC, of predominately terrestrial origin, at deep locations. The respiration of OC from benthic algae constituted 55% of the winter respiration, equaling 54% of the primary production by benthic algae the previous summer. The study indicates the importance of temporal and spatial variation in respiration for the metabolism and net DIC production in unproductive high-latitude lakes; both allochthonous and autochthonous carbon can contribute to winter DIC accumulation and, consequently, to spring CO2 emissions from lakes.
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| 7. |
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| 8. |
- Madestam, Jenny, 1974-
(författare)
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En kompispappa och en ytlig djuping : Partieliters ambivalenta partiledarideal
- 2009
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- This thesis studies political elites’ beliefs about the ideal party leader. This ideal, like other human ideals, is characterized by ambivalence. The thesis explores the ambivalence expressed in party elites’ leadership ideal and how it can be understood. The study draws primarily on qualitative interviews with members of the party elites in the Social Democratic Party and the Liberal Party in Sweden. Specifically, it analyzes the “life world” of the party leaders, party secretaries, group leaders in the Swedish Parliament, and election committee chairmen. Building on classical and modern research on leadership and political parties, the thesis derives an analytical tool to guide the interviews which covers six aspects of party leadership: Characteristics, Leadership style, Tasks, Freedom of action, Representation, and Status. The empirical analysis shows that the elites’ party leadership ideal is ambivalent and different across the two parties. The ambiguities can be summarized as dichotomies, where the ideal leader should encompass both sides of the dichotomy. The Social Democratic Party elites’ ideal is represented by two dichotomies: the leader versus the team and the party versus the government. To bridge the ambiguities, the elite resort to the idea of “anchoring”. This notion resolves conflicts between the leader and the surrounding team and the party and the government. The ideal of the Liberal Party’s elites includes four dichotomies: dogmatism versus pragmatism; idea versus person; appearance (outward-looking) versus action (inward-looking); and free versus constrained. Unlike the case of the Social Democratic Party, it is less evident how the Liberal Party’s elites accommodate the ambiguities. However, an emphasis on accountability and maintaining a balance between existing conflicts, partially remedies the dilemma. Also, the idea of leadership within the Liberal Party is less problematic compared to the Social Democratic Party. In sum, while the Social Democrats’ ideal resembles the “friendly father figure”, the Liberals’ ideal is portrayed by the “superficial intellectual”. The findings also indicate that the way in which the parties were established, their experience of being in government, size, ideology, and position within the party system affect their beliefs about leadership ideals.
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| 9. |
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| 10. |
- Olin, Anna-Carin, 1960, et al.
(författare)
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Single breath N2-test and exhaled nitric oxide in men.
- 2006
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Ingår i: Respiratory medicine. - : Elsevier BV. - 0954-6111. ; 100:6, s. 1013-9
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Tidskriftsartikel (refereegranskat)abstract
- The N(2) slope is an index of inhomogeneous distribution of ventilation and has been suggested to be suited for early testing of chronic obstructive pulmonary disease (COPD) in smokers. The aim of the present study was to examine the association between the fraction of exhaled nitric oxide (FENO) and the N(2) slope in a random population of smoking and non-smoking men. Altogether 57 subjects were included in the study, 24 never-smokers, seven ex-smokers and 26 current smokers. Subjects were examined twice, in 1995 when they regarded themselves as healthy, and in a follow-up in 2001. Spirometry, N(2) slope and high-resolution computed tomography (HRCT) were performed in 1995 while the follow-up examination included also measurement of FENO. The FENO value was significantly lower and the N(2) slope higher in current smokers. In smokers but not in never- or ex-smokers FENO was correlated to the difference in N(2) slope between 1995 and 2001 (r(s)=0.49, P=0.01). We analysed the data by multiple linear regression adjusted for smoking, mild respiratory symptoms and inhaled steroids. There were significant associations between FENO and the N(2) slope both in 1995 and in 2001. The strongest association was found to exist with the change in N(2) slope during these years. Sixteen of the subjects could be classified as having COPD, six with mild and ten with moderate COPD. There was a trend for an increase in N(2) slope with increased severity of COPD; among subjects with no COPD the N(2) slope in 2001 was 2.3% N(2)/L, and those with mild and moderate COPD had 2.5% N(2)/L and 3.9% N(2)/L, respectively (P=0.0004). No such trend was seen for FENO (17.8, 15.5 and 20.3 parts per billion (ppb), respectively, P=0.8). The results show that FENO is associated with the N(2) slope, indicating that FENO reflects inflammatory changes in the peripheral airways of both non-smoking and smoking subjects.
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