Effects of salinity on growth and mortality of migratory and resident forms of Eurasian perch in the Baltic Sea     

Petter Tibblin  Per Koch‐Schmidt  Per Larsson  Patrik Stenroth 《Ecology of Freshwater Fish》2012,21(2):200-206

Abstract – In the coastal areas of the Baltic Sea, there are two forms of perch (Perca fluviatilis). One of the forms is migratory and spawns in streams entering the Baltic Sea. The other form is resident and spawns in brackish water. Both forms utilise the coastal habitat for foraging. We examined the spawning success of the two forms in fresh and brackish water (7‰, equal to salinity in the south Baltic Sea). The experiments showed that hatching success was equally high in freshwater and in brackish water despite female origin. The survival of yellow‐sac and free swimming fry was significantly reduced in brackish water, which was independent if the fish was of migratory or brackish resident origin. Further, growth rate of perch fry was severely reduced in brackish water. The results indicate that perch has not developed any tolerance to brackish water in the young life stages. The migratory life strategy of perch can thus be explained by higher survival of fry in freshwater.  相似文献   

Diatom derived polyunsaturated aldehydes do not structure the planktonic microbial community in a mesocosm study     

Paul C  Reunamo A  Lindehoff E  Bergkvist J  Mausz MA  Larsson H  Richter H  Wängberg SÅ  Leskinen P  Båmstedt U  Pohnert G 《Marine drugs》2012,10(4):775-792

Several marine and freshwater diatoms produce polyunsaturated aldehydes (PUA) in wound-activated processes. These metabolites are also released by intact diatom cells during algal blooms. Due to their activity in laboratory experiments, PUA are considered as potential mediators of diatom-bacteria interactions. Here, we tested the hypothesis that PUA mediate such processes in a close-to-field mesocosm experiment. Natural plankton communities enriched with Skeletonema marinoi strains that differ in their PUA production, a plankton control, and a plankton control supplemented with PUA at natural and elevated concentrations were observed. We monitored bacterial and viral abundance as well as bacterial community composition and did not observe any influence of PUA on these parameters even at elevated concentrations. We rather detected an alternation of the bacterial diversity over time and differences between the two S. marinoi strains, indicating unique dynamic bacterial communities in these algal blooms. These results suggest that factors other than PUA are of significance for interactions between diatoms and bacteria.  相似文献   

Disruption of Phthorimaea operculella (Lepidoptera: Gelechiidae) oviposition by the application of host plant volatiles     

Gianfranco Anfora  Silvia Vitagliano  Mattias C Larsson  Peter Witzgall  Marco Tasin  Giacinto S Germinara  Antonio De Cristofaro 《Pest management science》2014,70(4):628-635

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Supply chain management in the Swedish wood products industry – a need analysis     

Magnus Larsson  Matti Stendahl  Anders Roos 《Scandinavian Journal of Forest Research》2016,31(8):777-787

This paper examines the potential of supply chain management (SCM) to address challenges associated with Swedish wood-based supply chains (SCs). Information drawn from a review of literature concerning SCM in the wood products industry is compared and contrasted with data obtained from a case study of an integrated sawmill SC in Northern Sweden, focusing on interviewed participants’ perceived needs and benefits of integrating SC operations. Key components of SCM for the wood products industry are suggested for categorizing the literature and results from the case study. Previous SCM studies have largely focused on solving planning problems by operational analysis, and/or SC strategies, while several important aspects including risk management, integrated performance indicators, power relations, leadership and culture have received relatively little attention. The interviews highlight needs to enhance SC actors’ coordination and communication, as well as for more systematic study of the potential for enhancing efficiency and profit margins in SCs of Swedish wood products.  相似文献   

The combined effect of wetting ability and durability on outdoor performance of wood: development and verification of a new prediction approach     

Linda?Meyer-VeltrupEmail authorView author&#;s OrcID profile  Christian?Brischke  Gry?Alfredsen  Miha?Humar  Per-Otto?Fl?te  Tord?Isaksson  Pia?Larsson?Brelid  Mats?Westin  J?ran?Jermer 《Wood Science and Technology》2017,51(3):615-637

Comprehensive approaches to predict performance of wood products are requested by international standards, and the first attempts have been made in the frame of European research projects. However, there is still an imminent need for a methodology to implement the durability and moisture performance of wood in an engineering design method and performance classification system. The aim of this study was therefore to establish an approach to predict service life of wood above ground taking into account the combined effect of wetting ability and durability data. A comprehensive data set was obtained from laboratory durability tests and still ongoing field trials in Norway, Germany and Sweden. In addition, four different wetting ability tests were performed with the same material. Based on a dose–response concept, decay rates for specimens exposed above ground were predicted implementing various indicating factors. A model was developed and optimised taking into account the resistance of wood against soft, white and brown rot as well as relevant types of water uptake and release. Decay rates from above-ground field tests at different test sites in Norway were predicted with the model. In a second step, the model was validated using data from laboratory and field tests performed in Germany and Sweden. The model was found to be fairly reliable, and it has the advantage to get implemented into existing engineering design guidelines. The approach at hand might furthermore be used for implementing wetting ability data into performance classification as requested by European standardisation bodies.  相似文献   

An indoor pelagic mesocosm facility to simulate multiple water-column characteristics     

Båmstedt  Ulf  Larsson  Henrik 《International Aquatic Research》2018,10(1):13-29

International Aquatic Research - Mesocosms are important research tools in aquatic ecology because they close the gap between laboratory studies at the individual or lower organization level and...  相似文献   

Chicken IgY: Utilizing the evolutionary difference   总被引：9，自引：0，他引：9  

Anders Larsson  John Sjquist 《Comparative immunology, microbiology and infectious diseases》1990,13(4):199-201

Chicken antibodies offer advantages over traditional ones (e.g. rabbit antibodies) due to the evolutionary difference between these immunoglobulins. Chicken give better antibody response against conserved mammalian antigens, they do not react with rheumatoid factors, bacterial or mammalian Fc receptors and can reduce background reactions due to cross-reactivity of anti-IgG antibodies.  相似文献   

P-12 Comparative study of griseofulvin and terbinafine therapy in the treatment of canine and feline dermatophytosis     

A. C. Balda  M. Otsuka  W. Gambale  C. E. Larsson 《Veterinary dermatology》2004,15(S1):44-44

Diagnosis of Microsporum canis infection is a challenge in cats with suspected asymptomatic carriage. The aim of this study was to compare the carpet method and the toothbrush method of sample collection for dermatophyte culture. The study was conducted on apparently healthy cats in a chronically infected cattery. Sampling was performed with both a sterilized piece of carpet and a toothbrush applied to the entire body surface. Samples were inoculated on Sabouraud's media (with chloramphenicol and cycloheximide). Multiple (6) applications with the toothbrush were necessary to obtain a similar surface area of inoculation. Cultures were incubated at 27°C, then examined from day 5 to 21 for the presence and number of colonies of M. canis and other fungi. Some samples were inoculated twice (initially negative or with a low number of M.canis ). A total of 112 cultures were performed (14 duplicates) from 44 cats. On day 21, infection was detected in 23 cats (54.7%): 20 (87%) with the carpet method and 21 (91%) with the toothbrush method. None of the replicated cultures allowed the detection of new cases but three were subsequently negative. In eight cases, only one to six colonies of M. canis were obtained. Both methods used are easy to perform on cats and have a similar sensitivity of approximately 90%. The carpet method is, however, much less expensive, easier to prepare, mail, store and inoculate. The lack of growth in some duplicate cultures (initial development of one or two colonies) may explain the limits of diagnosis of infection and justify the need for multiple inoculations of agar with the toothbrush method.
Funding: Self-funded.  相似文献   

Influence of an Electrode Change on Reference Values for Cow Serum Ionized Calcium     

C. Kvart  L. Larsson  S. hman 《Acta veterinaria Scandinavica》1980,21(3):454

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The use of monoclonal antibodies in enzyme linked immunosorbent assays for detection of antibodies to bovine viral diarrhoea virus   总被引：1，自引：0，他引：1  

N Juntti  B Larsson  C Fossum 《Zentralblatt für Veterin?rmedizin. Reihe B. Journal of veterinary medicine. Series B》1987,34(5):356-363

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