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.
2025
Authors
Andreas Hagenbo Lise Dalsgaard Marius Hauglin Stephanie Eisner Line Tau Strand O. Janne KjønaasAbstract
No abstract has been registered
Abstract
In 2024, spruce bark beetle (Ips typographus) catches decreased in all counties except Telemark, Sør-Trøndelag, and Nordland. The highest catches this year were observed in Telemark and Buskerud. In Telemark, the catches are the highest recorded since the major spruce bark beetle outbreak that started in the mid-1970s. In Buskerud, while catches have declined compared to last year, they remain historically high. In Oppland, the catches have decreased markedly from the record-breaking year of 2023 but remain at moderately high levels. Across Southern Norway, this year’s catches are slightly above the 46-year average. The relatively high catches in Buskerud and Oppland are likely a delayed response to the storm damage in November 2021, as municipalities heavily affected by the storm report especially high catches. Additionally, field reports in 2024 indicate attacks on standing trees in areas with much windfall after the 2021 storm. Many of these damage reports likely pertain to trees attacked by beetles in 2023 or earlier but that are only now showing visible symptoms. The 2024 bark beetle season was characterized by extremely dry and warm weather in May, followed by a very wet summer with normal to slightly below-average temperatures. The warm May weather coincides with the beetles' primary flight period, favoring beetle dispersal and egg-laying. Additionally, the dry conditions in May may have stressed spruce trees, reducing their resistance to beetle attacks. The wet weather later in the summer likely benefited the trees while being sub-optimal for the beetles. Overall, the weather conditions during the 2024 season were probably relatively favorable for the beetles. A temperature-based development model estimate that, by September 17, the spruce bark beetle could have completed two generations near the Oslofjord, along the southern coastline, and in low-lying inland valleys. However, these model results do not necessarily mean that the beetles completed two generations in 2024 but indicate that conditions were warm enough to make it possible.
Abstract
No abstract has been registered
Authors
Zahra Bitarafan Wiktoria Kaczmarek-Derda Therese With Berge Inger Sundheim Fløistad Christian AndreasenAbstract
No abstract has been registered
Authors
Szymon Rusinowski Jacek Krzyżak Krzysztof Sitko Alicja Szada-Borzyszkowska Jacek Borgulat Paulina Janota Radosław Stec Hans Martin Hanslin Marta PogrzebaAbstract
No abstract has been registered
Abstract
No abstract has been registered
Abstract
Diptera larvae and Nematoda were extracted from soil samples collected in the foreland of the receding Hardangerjøkulen glacier near Finse, central south Norway. Samples were standardized by being taken in snowbed habitats with Salix herbacea L. vegetation. Diptera larvae were sampled in twenty plots from 32 to 227 years age, complemented by five plots with about 10,000-year-old soil. Nematodes were studied in soils of 4, 37, 39, 62, 78, 119, and 204 years age. There was a rapid colonization in young soils of both Diptera larvae and nematodes. Brachycera larvae were sparsely represented, and Sciaridae and Chironomidae larvae were most numerous in soils younger than 50 years. Genera of Chironomidae larvae were Bryophaenocladius, Pseudosmittia, Parasmittia, and Smittia. The number of nematode taxa increased from six in the youngest soil to fourteen in the oldest. Bacterial feeders were dominated by the genus Rhabditis sensu lato and fungal feeders by Tylenchus sensu lato. The plant-parasitic Paratylenchus sp. was present at 4 years, with highest abundance at 39 years. The abundance of omnivores (subfamily Dorylaiminae) did not vary between soil ages, but predators (fam. Mononchidae and genus Tripyla) were more abundant at 78 and 119 years.
Abstract
No abstract has been registered
Authors
Yanqing Li Yulian Zeng Daojun Li Lijuan Yu Qianwen Ding Yalin Yang Chao Ran Yuanyuan Yao Rolf-Erik Olsen Einar Ringø Jihong Liu Clarke Zhen Zhang Zhigang ZhouAbstract
No abstract has been registered
Abstract
No abstract has been registered