Publications
NIBIOs employees contribute to several hundred scientific articles and research reports every year. You can browse or search in our collection which contains references and links to these publications as well as other research and dissemination activities. The collection is continously updated with new and historical material.
2012
Abstract
No abstract has been registered
Authors
Mohamed Abdelhalim Åshild Ergon Mallikarjuna Rao Kovi Anil Kunapareddy May Bente Brurberg Ingerd Skow Hofgaard Anne Marte Tronsmo Odd Arne RognliAbstract
No abstract has been registered
Authors
Hanne Sogge Thomas Rohrlack Trine Ballestad Rounge Jørn Henrik Sønstebø Ave Tooming-Klunderud Tom Kristensen Kjetill Sigurd JakobsenAbstract
Several Planktothrix strains, each producing a distinct oligopeptide profile, have been shown to coexist within Lake Steinsfjorden (Norway). Using nonribosomal peptide synthetase (NRPS) genes as markers, it has been shown that the Planktothrix community comprises distinct genetic variants displaying differences in bloom dynamics, suggesting a Planktothrix subpopulation structure. Here, we investigate the Planktothrix variants inhabiting four lakes in southeast of Norway utilizing both NRPS and non-NRPS genes. Phylogenetic analyses showed similar topologies for both NRPS and non-NRPS genes, and the lakes appear to have similar structuring of Planktothrix genetic variants. The structure of distinct variants was also supported by very low genetic diversity within variants compared to the between-variant diversity. Incongruent topologies and split decomposition revealed recombination events between Planktothrix variants. In several strains the gene variants seem to be a result of recombination. Both NRPS and non-NRPS genes are dominated by purifying selection; however, sites subjected to positive selection were also detected. The presence of similar and well-separated Planktothrix variants with low internal genetic diversity indicates gene flow within Planktothrix populations. Further, the low genetic diversity found between lakes (similar range as within lakes) indicates gene flow also between Planktothrix populations and suggests recent, or recurrent, dispersals. Our data also indicate that recombination has resulted in new genetic variants. Stability within variants and the development of new variants are likely to be influenced by selection patterns and within-variant homologous recombination.
Abstract
No abstract has been registered
Authors
Camilla Østerud M. Ashraful Islam Jorunn Elisabeth Olsen Dag-Ragnar Blystad Sissel Torre Anne Kathrine Hvoslef-Eide Jihong Liu ClarkeAbstract
No abstract has been registered
Authors
L. Dupont T Decaens Emmanuel Lapied V. Chassany R. Marichal F. Dubs M. Maillot V. RoyAbstract
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No abstract has been registered
Authors
Laura Parducci Tina Jørgensen Mari Mette Tollefsrud Ellen Elverland Torbjørn Alm Sonia L. Fontana Keith D. Bennett James Haile Irina Matetovici Yoshihisa Suyama Mary E. Edwards Kenneth Andersen Morten Rasmussen Sanne Boessenkool Eric Coissac Christian Brochmann Pierre Taberlet Michael Houmark-Nielsen Nicolaj K. Larsen Ludovic Orlando M. Thomas P. Gilbert Kurt H. Kjær Inger Greve Alsos Eske WillerslevAbstract
No abstract has been registered
Authors
J. Limpens G. Granath R Aerts M. M. P. D. Heijmans L. J. Sheppard L. Bragazza B. L. Williams H. Rydin J. Bubier T. Moore L. Rochefort E. A. D. Mitchell A Buttler L. J. L. van den Berg U Gunnarsson AJ Francez R Gerdol M. Thormann P. Grosvernier M. M. Wiedermann M. B. Nilsson M. R. Hoosbeek S. Bayley Jørn-Frode Nordbakken M. P. C. P. Paulissen S. Hotes A. Breeuwer M. Ilomets H. B. M. Tomassen I. Leith B. XuAbstract
Peat bogs have accumulated more atmospheric carbon (C) than any other terrestrial ecosystem today. Most of this C is associated with peat moss (Sphagnum) litter. Atmospheric nitrogen (N) deposition can decrease Sphagnum production, compromising the C sequestration capacity of peat bogs. The mechanisms underlying the reduced production are uncertain, necessitating multifactorial experiments.•We investigated whether glasshouse experiments are reliable proxies for field experiments for assessing interactions between N deposition and environment as controls on Sphagnum N concentration and production. We performed a meta-analysis over 115 glasshouse experiments and 107 field experiments.•We found that glasshouse and field experiments gave similar qualitative and quantitative estimates of changes in Sphagnum N concentration in response to N application. However, glasshouse-based estimates of changes in production – even qualitative assessments – diverged from field experiments owing to a stronger N effect on production response in absence of vascular plants in the glasshouse, and a weaker N effect on production response in presence of vascular plants compared to field experiments.•Thus, although we need glasshouse experiments to study how interacting environmental factors affect the response of Sphagnum to increased N deposition, we need field experiments to properly quantify these effects.
Authors
Ragnhild Aabøe Inglingstad Binyam Sime Dagnachew Tove Gulbrandsen Devold Andrea Criscione Bernardo Valenti Siv Borghild Skeie Håvard Steinshamn Gerd Elisabeth VegarudAbstract
No abstract has been registered