SwePub
Sök i SwePub databas

  Utökad sökning

Träfflista för sökning "WFRF:(Hansson Lars Anders) "

Sökning: WFRF:(Hansson Lars Anders)

  • Resultat 41-50 av 324
Sortera/gruppera träfflistan
   
NumreringReferensOmslagsbildHitta
41.
  • Donis, Daphne, et al. (författare)
  • Stratification strength and light climate explain variation in chlorophyll a at the continental scale in a European multilake survey in a heatwave summer
  • 2021
  • Ingår i: Limnology and Oceanography. - : John Wiley & Sons. - 0024-3590 .- 1939-5590. ; 66:12, s. 4314-4333
  • Tidskriftsartikel (refereegranskat)abstract
    • To determine the drivers of phytoplankton biomass, we collected standardized morphometric, physical, and biological data in 230 lakes across the Mediterranean, Continental, and Boreal climatic zones of the European continent. Multilinear regression models tested on this snapshot of mostly eutrophic lakes (median total phosphorus [TP] = 0.06 and total nitrogen [TN] = 0.7 mg L-1), and its subsets (2 depth types and 3 climatic zones), show that light climate and stratification strength were the most significant explanatory variables for chlorophyll a (Chl a) variance. TN was a significant predictor for phytoplankton biomass for shallow and continental lakes, while TP never appeared as an explanatory variable, suggesting that under high TP, light, which partially controls stratification strength, becomes limiting for phytoplankton development. Mediterranean lakes were the warmest yet most weakly stratified and had significantly less Chl a than Boreal lakes, where the temperature anomaly from the long-term average, during a summer heatwave was the highest (+4 degrees C) and showed a significant, exponential relationship with stratification strength. This European survey represents a summer snapshot of phytoplankton biomass and its drivers, and lends support that light and stratification metrics, which are both affected by climate change, are better predictors for phytoplankton biomass in nutrient-rich lakes than nutrient concentrations and surface temperature.
  •  
42.
  • Ekvall, Mikael T., et al. (författare)
  • Adsorption of bio-organic eco-corona molecules reduces the toxic response to metallic nanoparticles in Daphnia magna
  • 2021
  • Ingår i: Scientific Reports. - : Springer Nature. - 2045-2322. ; 11:1
  • Tidskriftsartikel (refereegranskat)abstract
    • As the use of engineered nanomaterials increases, so does the risk of them spreading to natural ecosystems. Hitherto, knowledge regarding the toxic properties of nanoparticles (NP's) and their potential interactions with natural bio-organic molecules adsorbed to them, and thereby forming surface coronas, is limited. However, we show here that the toxic effect of NPs of tungsten carbide cobalt (WC-Co) and cobalt (Co) on the crustacean Daphnia magna is postponed in the presence of natural biological degradation products (eco-corona biomolecules). For Daphnia exposed to WC-Co NPs the survival time increased with 20-25% and for Co NPs with 30-47% after mixing the particles with a solution of eco-corona biomolecules before exposure. This suggests that an eco-corona, composed of biomolecules always present in natural ecosystems, reduces the toxic potency of both studied NPs. Further, the eco-coronas did not affect the particle uptake, suggesting that the reduction in toxicity was related to the particle-organism interaction after eco-corona formation. In a broader context, this implies that although the increasing use and production of NPs may constitute a novel, global environmental threat, the acute toxicity and long-term effects of some NPs will, at least under certain conditions, be reduced as they enter natural ecosystems.
  •  
43.
  • Eriksson, Anders, et al. (författare)
  • Evaluation of delivery strategies for forest fuels applying a model for Weather-driven Analysis of Forest Fuel Systems (WAFFS)
  • 2017
  • Ingår i: Applied Energy. - : Elsevier BV. - 0306-2619 .- 1872-9118. ; 188, s. 420-430
  • Tidskriftsartikel (refereegranskat)abstract
    • Earlier studies have highlighted the importance of quality and quantity in forest fuel supply chains, since these parameters affect product value and handling properties, but both are constantly changing over time. Great monetary losses can be incurred if forest fuel material has to be delivered to end-users in non-optimal condition, e.g. to meet seasonal fuel demand with its large short-term variations. Thus earlier studies have also highlighted the importance of more information on the forest fuel supply chain. This paper describes development of a model for Weather-driven Analysis of Forest Fuel Systems (WAFFS) that can be used when analysing forest fuel supply chains and that accounts for both active machine activities and passive activities such as quality changes during storage. The aim was to develop a methodology that can be used to evaluate forest fuel supply chain scenarios and analyse various delivery strategies under different conditions. Application of WAFFS to evaluate delivery strategies for forest fuels showed that system improvements were possible when the right biomass was delivered at the right time. The WAFFS model gives an overview of biomass actually stored at different geographical locations and places (heaps or windrows) in terms of both quality and quantity. Delivery strategies actively prioritising biomass storage proved capable of delivering more energy when most needed, thereby improving yearly machine utilisation for contractors in the supply chain. (C) 2016 Elsevier Ltd. All rights reserved.
  •  
44.
  • Hallgren, Per, et al. (författare)
  • Synthetic estrogen directly affects fish biomass and may indirectly disrupt aquatic food webs
  • 2014
  • Ingår i: Environmental Toxicology and Chemistry. - : Wiley. - 0730-7268. ; 33:4, s. 930-936
  • Tidskriftsartikel (refereegranskat)abstract
    • Endocrine-disrupting chemicals are known to alter the fitness of individual organisms via changes in growth, behavior, and reproduction. It is largely unknown, however, whether these effects cascade through the food web and indirectly affect other, less sensitive organisms. The authors present results from a mesocosm experiment whereby the effects of the synthetic estrogen 17α-ethinylestradiol (EE2) were quantified in pelagic communities. Treatment with EE2 at a concentration of 28 ng/L had no large effects on the pelagic communities composed only of phytoplankton and zooplankton. In communities where planktivorous roach (Rutilus rutilus) were also present, however, EE2 caused a significant reduction in fish biomass. Moreover, zooplankton biomass was higher in the EE2 treatments, suggesting that zooplankton may have been released from fish predation. Hence, the direct effect of EE2 on roach may have cascaded down the food web to produce positive indirect effects on zooplankton. This result was supported in complementary foraging experiments with roach, showing reduced foraging performance after exposure to EE2. Despite the observed negative effect of EE2 on roach and the positive indirect effect on zooplankton, these effects did not cascade to phytoplankton, possibly because only copepods, but not cladocerans—the major grazers in these systems—were released from fish predation. The authors conclude that the known reproductive impairment in fish by EE2 in combination with the disturbed foraging performance observed in the present study may be a disadvantage to fish that may result in increasing abundance or biomass of prey such as zooplankton. Hence, EE2 may have consequences for both the structure and function of freshwater communities.
  •  
45.
  • Hansen, Joan H., et al. (författare)
  • Ecological consequences of animal migration : Prey partial migration affects predator ecology and prey communities
  • 2019
  • Ingår i: Ecosystems (New York. Print). - : Springer Science and Business Media LLC. - 1432-9840 .- 1435-0629. ; , s. 1-15
  • Tidskriftsartikel (refereegranskat)abstract
    • Patterns of animal migration and the ecological forces that shape them have been studied for centuries. Yet ecological impacts caused by the migration, such as altered predator–prey interactions and effects on community structure, remain poorly understood. This is to a large extent due to the scarcity of naturally replicated migration systems with negative controls, that is, ecosystems without migration. In this study, we tested whether partial migration of certain species within the overall prey community affects foraging ecology of top predators and thereby alters energy pathways in food webs. We carried out the study in independent replicated freshwater lake systems, four with and four without opportunity for prey migration. Specifically, we compared predator foraging mode in lakes where cyprinid prey fish perform seasonal partial migrations into connected streams with lakes lacking migratory opportunities for prey fish. We found clear seasonal bottom-up effects of prey migration on predators, including changes in size structure and total biomass of ingested prey, size-specific changes in littoral versus pelagic origin of diet, and a higher degree of feast-and-famine for predators in systems with migratory prey. Our analyses further showed that partially migratory prey species constitute a larger part of the prey community in systems that allow migration. Hence, prey migrations have important implications for predator foraging ecology and may cause seasonal shifts in the importance of their supporting energy pathways. We suggest that such bottom-up effects of partial migration may be a widespread phenomenon both in aquatic and in terrestrial ecosystems. © 2019, Springer Science+Business Media, LLC, part of Springer Nature.
  •  
46.
  • Hansson, L-A, et al. (författare)
  • An introduction to animal movement
  • 2014
  • Ingår i: Animal movement across scales. - : Oxford University Press. - 9780199677191
  • Bokkapitel (refereegranskat)
  •  
47.
  • Hansson, Lars-Anders, et al. (författare)
  • Conflicting demands on wetland ecosystem services: nutrient retention, biodiversity or both?
  • 2005
  • Ingår i: Freshwater Biology. - : Wiley. - 0046-5070 .- 1365-2427. ; 50:4, s. 705-714
  • Tidskriftsartikel (refereegranskat)abstract
    • 1. Wetland ecosystems may, besides having considerable economical value, increase landscape biodiversity and function as traps for nutrients from land to freshwater- and marine systems. As a result of these features, wetlands are nowadays often protected and restored, and many countries have even initiated wetland construction programmes. 2. In the present study, we aim at increasing the knowledge on how to improve the design of a wetland with respect to both biodiversity and nutrient retention, by analysing physical, chemical and biological features of a large set of constructed wetlands. 3. Our results show that a combination of the wetland features, namely shallow depth, large surface area and high shoreline complexity are likely to provide a high biodiversity of birds, benthic invertebrates and macrophytes and to have high nitrogen retention, whereas a small, deep wetland is likely to be more efficient in phosphorus retention, but less valuable in terms of biodiversity. 4. Hence, among the features used to design new wetlands, area, depth and shoreline complexity have fundamental, and sometimes conflicting, effects on nutrient retention and biodiversity. This means that there are, within limits, possibilities to direct the ecosystem function of a specific wetland in desired directions.
  •  
48.
  • Hansson, Lars-Anders, et al. (författare)
  • Consequences of fish predation, migration, and juvenile ontogeny on zooplankton spring dynamics
  • 2007
  • Ingår i: Limnology and Oceanography. - 1939-5590. ; 52:2, s. 696-706
  • Tidskriftsartikel (refereegranskat)abstract
    • In order to disentangle if and when resource supply and adult and young-of-the-year (0+) fish predation affect zooplankton dynamics during spring, we monitored zooplankton during three consecutive years in a lake in southern Sweden. We also experimentally assessed 0+ fish predation rates and estimated changes in predation rates of adult fish on zooplankton. Decline in abundances of large-sized zooplankters in early spring was not caused by 0+ fish predation. Instead, this decline was most likely a combined result of size-selective predation from adult fish (stationary in the lake and from those returning from surrounding streams) and competition for diminishing algal food resources. On the other hand, the decline in medium-sized zooplankton in the lake during spring was strongly affected by 0+ fish. Hence, during spring, zooplankton are facing predation both from adult fish selecting large prey and from 0+ fish, which start feeding on small-sized prey and eventually switch to larger. Neither predation by different ontogenetic stages of fish (adult and 0+) nor resource supply shape the zooplankton spring dynamics, but rather they affect the timing and strength of these events. 0+ cyprinids tend to have stronger effect on zooplankton dynamics than other taxa of 0+ fish. A combination of predation from adult and 0+ fish during spring is the main mechanism behind the crash of the zooplankton community, which in many lakes leads to the termination of the clear-water phase.
  •  
49.
  • Hansson, Lars-Anders, et al. (författare)
  • Waterfowl, macrophytes, and the clear water state of shallow lakes
  • 2010
  • Ingår i: Hydrobiologia. - : Springer Science+Business Media B.V.. - 0018-8158 .- 1573-5117. ; 646:1, s. 101-109
  • Tidskriftsartikel (refereegranskat)abstract
    • The importance of lake ecosystems for waterfowl remains a topic of debate. In order to assess how temporal variations in lake features, specifically shifts between alternative stable states, may interact with the waterfowl fauna, we performed a long-term (22 years) study of the shallow Lake Krankesjon, southern Sweden. Lower total numbers of waterfowl occurred during periods with low macrophyte cover and turbid water, than when submersed macrophytes flourished and the water was clear. Some specific functional groups of waterfowl, such as herbivores, invertebrate, and fish feeders, showed a positive relation to clear water and high macrophyte cover. Hence, our data suggest that some migratory waterfowl may select lakes based on water quality, thereby adjusting their large-scale migratory routes. On the other hand, omnivorous waterfowl exhibited their highest abundances during turbid conditions. Furthermore, waterfowl not primarily relying on food from the lake showed no response to fluctuations in turbidity or macrophyte cover, but followed regional trends in population dynamics. In our study lake, L. Krankesjon, we estimated that waterfowl remove less than 3% of the macrophyte biomass during a stable clear-water state with lush macrophyte beds. However, during transition periods between alternative stable states, when macrophyte biomass is lower and the plants already stressed, the consumption rate of waterfowl may have a stronger effect on lake ecosystem functioning.
  •  
50.
  • Hansson, Lars, et al. (författare)
  • Eye and Body Movements Characterized by Synchronized Sampling
  • 1998
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • An example of a result from a long-term cooperation with Lund University (together with professor Roland Akselsson at the Department of Ergonomics and Aerosol Technology) there some of the authors. (Engström) gained extensive grants (EU-financing and Wallenberg Stifelsen regarding equipment as well as other founding from e.g. the Swedish Work Environment Found). This publication was a result of the just mentioned EU-financing.
  •  
Skapa referenser, mejla, bekava och länka
  • Resultat 41-50 av 324
Typ av publikation
tidskriftsartikel (275)
konferensbidrag (14)
bokkapitel (12)
forskningsöversikt (9)
bok (4)
rapport (3)
visa fler...
annan publikation (3)
doktorsavhandling (3)
samlingsverk (redaktörskap) (1)
visa färre...
Typ av innehåll
refereegranskat (297)
övrigt vetenskapligt/konstnärligt (23)
populärvet., debatt m.m. (4)
Författare/redaktör
Hansson, Lars-Anders (218)
Brönmark, Christer (77)
Larsson, Anders (41)
Hansson, Lars-Olof (38)
Brodersen, Jakob (30)
Skov, Christian (25)
visa fler...
Hulthén, Kaj (23)
Urrutia-Cordero, Pab ... (18)
Nilsson, Anders (17)
Zhang, Huan (17)
Chapman, Ben (16)
Hylander, Samuel (16)
Nicolle, Alice (15)
Persson, Anders (13)
Gyllström, Mikael (12)
Ekvall, Mikael T. (12)
Nilsson, P. Anders, ... (12)
Rengefors, Karin (11)
Cedervall, Tommy (11)
Bianco, Giuseppe (11)
Flodin, Mats (11)
Baktoft, Henrik (10)
Nilsson, Jan Åke (9)
Åkesson, Susanne (9)
Ekvall, Mikael (9)
Chapman, Ben B (9)
Xu, Jun (9)
Ekvall, Mattias (9)
Granéli, Wilhelm (8)
Nilsson, Per Anders, ... (8)
Moss, B (8)
Lee, Marcus (8)
Sha, Yongcui (8)
Ekvall, Mattias K. (8)
van Donk, Ellen (7)
Grubb, Anders (7)
Mattsson, Karin (7)
Ståhl-Delbanco, Anni ... (7)
Romare, Pia (7)
Vinterstare, Jerker (7)
Linse, Sara (6)
Hansson, Oskar (6)
Kritzberg, Emma (6)
Hallgren, Per (6)
Moss, Brian (6)
Björnerås, Caroline (6)
Škerlep, Martin (6)
Pärssinen, Varpu (6)
Zhang, Min (6)
Lurling, Miquel (6)
visa färre...
Lärosäte
Lunds universitet (225)
Uppsala universitet (75)
Karlstads universitet (31)
Linnéuniversitetet (21)
Karolinska Institutet (16)
Umeå universitet (15)
visa fler...
Göteborgs universitet (10)
Chalmers tekniska högskola (8)
Kungliga Tekniska Högskolan (7)
Sveriges Lantbruksuniversitet (6)
Stockholms universitet (5)
Linköpings universitet (5)
Högskolan i Skövde (4)
Örebro universitet (3)
Högskolan Kristianstad (2)
RISE (2)
Luleå tekniska universitet (1)
Högskolan i Halmstad (1)
Högskolan Väst (1)
Mälardalens universitet (1)
Jönköping University (1)
Malmö universitet (1)
Högskolan Dalarna (1)
Havs- och vattenmyndigheten (1)
visa färre...
Språk
Engelska (316)
Svenska (7)
Odefinierat språk (1)
Forskningsämne (UKÄ/SCB)
Naturvetenskap (225)
Medicin och hälsovetenskap (55)
Teknik (14)
Lantbruksvetenskap (5)
Samhällsvetenskap (3)

År

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

 
pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy