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.
2026
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Darius KviklysAbstract
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Limited information is available on cranberry crop load management. Earlier research has primarily examined flower thinning in cranberry, while the impact of fruit thinning has not yet been investigated. This study evaluated the effects of fruit thinning during early fruit development on fruit quality, return bloom, and chlorophyll fluorescence in two cranberry (Vaccinium macrocarpon) cultivars, “Pilgrim” and “Stevens.” Treatments included: (0F) removing all fruits on the upright, (1F) removing all but the lowermost fruit, (2F) removing all but the two lowermost fruits, and (C) no fruit removal (control). The majority of the non-treated uprights produced two fruits in “Pilgrim” and three fruits in “Stevens.” In “Pilgrim,” 1F resulted in heavier fruit with higher anthocyanin concentration but lower concentrations of total soluble solids (TSS) and titratable acidity (TA). In “Stevens” 1F and 2F resulted in heavier fruit but had little effect on TSS and TA, while 1F decreased fruit anthocyanin. The effects on fruit surface color were negligible. In both cultivars, return bloom was enhanced by removing all fruit on the upright indicating a strong biennial bearing tendency of individual uprights. Fruit production strongly suppressed vegetative growth of uprights in the following year, especially in “Pilgrim.” Chlorophyll fluorescence kinetic parameters decreased in 0F, indicating lower photosynthetic efficiency in the absence of fruit. The results suggest that fruit thinning is an effective approach for increasing the individual fruit weight of cranberry crop and that cranberry fruit are strong sinks that effectively suppress generative and vegetative growth of the uprights in the subsequent year.
Authors
Narta Elshani Steffen Adler Tidåker, Pernilla Jon Kristian Sommerseth Matthias Koesling Håvard SteinshamnAbstract
Green biorefineries (GBRs) aim to reduce reliance on imported feed by extracting protein from forage. Their environmental performance depends on co-product utilization, including the pulp which contains up to 70% of the original biomass dry matter. Using a life cycle assessment approach, we compared a conventional dairy system with two GBR-integrated systems differing in land availability for forage production, where pulp fraction replaced forage in cattle diets, adjusted using the Nordic Feed Evaluation System. Both GBR-integrated systems showed higher environmental impacts per kg milk than the conventional, driven by increased concentrate feed inputs or expanded land use for forage production to maintain milk production. Impact increased by up to 7% and 8% for global warming potential and land use, respectively, while other impact categories showed similar or even higher increases. Substituting soybean meal elsewhere with GBR-produced protein concentrate partially offset these impacts but was insufficient to reduce impacts below the conventional system. In a sensitivity analysis, neither a higher feeding value for pulp nor a higher-impact assumption for the avoided soybean meal alone was enough to bring impacts below the conventional system. Only when both were combined did global warming potential and land use fall below conventional, by 5%.
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Bumblebees are keystone pollinators which facilitate the reproduction of a wide range of wild and agricultural plants. Their abundance and diversity have been severely reduced by anthropogenic stressors such as widespread land-use change and habitat fragmentation. However, we lack a comprehensive understanding of population structure and local adaptation in bumblebees inhabiting human-altered landscapes. Here, we discover significant fine-scale (e.g. ~300 km) population structure within two common bumblebee species, Bombus lapidarius and Bombus pascuorum, by analysing whole genome data of 106 specimens from 7 sites in northern Europe. While the observed population structure is largely associated with natural oceanic barriers, we also detect significant divergence between populations sampled from anthropogenic landscapes which are not separated by such barriers. Furthermore, whereas genetic divergence in B. lapidarius is spread relatively evenly across the genome, divergence in B. pascuorum is concentrated within several megabase-sized genomic regions—including a putative chromosomal inversion – which may underlie well-known colour polymorphisms across its range. Our observations reveal a distinct genomic architecture underlying population structure within these bumblebee species, and highlight the necessity of increasing our understanding of bumblebee connectivity to design optimal bumblebee conservation strategies.
Authors
Nora Røhnebæk Aasen Sybil A. Herrera-Foessel Silius Mortensønn Vandeskog Therése Bengtsson Mulatu G. Dida Isak Drozdik Sigridur Dalmannsdottir Egill Gautason Jaroslaw S. Grodek Hrannar S. Hilmarsson Merja Högnäsbacka Ortrud Jäck Janne Kaseva Antti Laine Alex Lenkoski Morten Lillemo Min Lin Anne Marthe Lundby Shirin Mohammadi Per Jarle Møllerhagen Markku Niskanen Rodomiro Ortiz Maxie Skalshøi Anna G. Þórðardóttir Maria ThorkildsenAbstract
No abstract has been registered