Publikasjoner
NIBIOs ansatte publiserer flere hundre vitenskapelige artikler og forskningsrapporter hvert år. Her finner du referanser og lenker til publikasjoner og andre forsknings- og formidlingsaktiviteter. Samlingen oppdateres løpende med både nytt og historisk materiale. For mer informasjon om NIBIOs publikasjoner, besøk NIBIOs bibliotek.
2023
Sammendrag
Resource specialization and ecological speciation arising through host-associated genetic differentiation (HAD) are frequently invoked as an explanation for the high diversity of plant-feeding insects and other organisms with a parasitic lifestyle. While genetic studies have demonstrated numerous examples of HAD in insect herbivores, the rarity of comparative studies means that we still lack an understanding of how deterministic HAD is, and whether patterns of host shifts can be predicted over evolutionary timescales. We applied genome-wide single nucleotide polymorphism and mitochondrial DNA sequence data obtained through genome resequencing to define species limits and to compare host-plant use in population samples of leaf- and bud-galling sawflies (Hymenoptera: Tenthredinidae: Nematinae) collected from seven shared willow (Salicaceae: Salix) host species. To infer the repeatability of long-term cophylogenetic patterns, we also contrasted the phylogenies of the two galler groups with each other as well as with the phylogeny of their Salix hosts estimated based on RADseq data. We found clear evidence for host specialization and HAD in both of the focal galler groups, but also that leaf gallers are more specialized to single host species compared with most bud gallers. In contrast to bud gallers, leaf gallers also exhibited statistically significant cophylogenetic signal with their Salix hosts. The observed discordant patterns of resource specialization and host shifts in two related galler groups that have radiated in parallel across a shared resource base indicate a lack of evolutionary repeatability in the focal system, and suggest that short- and long-term host use and ecological diversification in plant-feeding insects are dominated by stochasticity and/or lineage-specific effects.
Forfattere
Matti T. Heino Tommi Nyman Jukka U. Palo Jenni Harmoinen Mia Valtonen Małgorzata Pilot Sanni Översti Elina Salmela Mervi Kunnasranta Risto Väinölä A. Rus Hoelzel Jouni AspiSammendrag
Det er ikke registrert sammendrag
2022
Forfattere
Tommi Nyman Saskia Wutke Elina Koivisto Tero Klemola Mark R. Shaw Tommi Andersson Håkon Haraldseide Snorre Hagen Ryosuke Nakadai Kai RuohomäkiSammendrag
Det er ikke registrert sammendrag
Forfattere
Stephany Virrueta Herrera Kevin P. Johnson Andrew D. Sweet Eeva Ylinen Mervi Kunnasranta Tommi NymanSammendrag
Det er ikke registrert sammendrag
Sammendrag
Det er ikke registrert sammendrag
Forfattere
Simo Maduna Adam Vivian-Smith Ólöf Dóra Bartels Jónsdóttir Albert Imsland Cornelya Klutsch Tommi Nyman Hans Geir Eiken Snorre HagenSammendrag
We determined the mitogenome of Cyclopterus lumpus using a hybrid sequencing approach, and another four closely related species in the Liparidae based on available next-generation sequence data. We found that the mitogenome of C. lumpus was 17,266 bp in length, where the length and organisation were comparable to those reported for cottoids. However, we found a GC-homopolymer region in the intergenic space between tRNALeu2 and ND1 in liparids and cyclopterids. Phylogenetic reconstruction confirmed the monophyly of infraorders and firmly supported a sister-group relationship between Cyclopteridae and Liparidae. Purifying selection was the predominant force in the evolution of cottoid mitogenomes. There was significant evidence of relaxed selective pressures along the lineage of deep-sea fish, while selection was intensified in the freshwater lineage. Overall, our analysis provides a necessary expansion in the availability of mitogenomic sequences and sheds light on mitogenomic adaptation in Cottoidei fish inhabiting different aquatic environments.
2021
Forfattere
Eris Aas BakketeigSammendrag
Det er ikke registrert sammendrag
Forfattere
Claire R. Peart Sergio Tusso Saurabh D. Pophaly Fidel Botero-Castro Chi-Chih Wu David Aurioles-Gamboa Amy B. Baird John W. Bickham Jaume Forcada Filippo Galimberti Neil J. Gemmell Joseph I. Hoffman Kit M. Kovacs Mervi Kunnasranta Christian Lydersen Tommi Nyman Larissa Rosa de Oliveira Anthony J. Orr Simona Sanvito Mia Valtonen Aaron B.A. Shafer Jochen B.W. WolfSammendrag
Det er ikke registrert sammendrag
Forfattere
Melak Weldenegodguad Kisun Pokharel Laura Niiranen Päivi Soppela Innokentyi Ammosov Mervi Honkatukia Heli Lindeberg Jaana Peippo Tiina Reilas Nuccio Mazzullo Kari A. Mäkelä Tommi Nyman Arja Tervahauta Karl-Heinz Herzig Florian Stammler Juha KantanenSammendrag
Det er ikke registrert sammendrag
Forfattere
Natalia Fraija-Fernández Andrea Waeschenbach Andrew G. Briscoe Suzanne Hocking Roman Kuchta Tommi Nyman D. Timothy J. LittlewoodSammendrag
Broad tapeworms (Diphyllobothriidea) are parasites whose adults are capable of infecting a wide range of freshwater, marine and terrestrial tetrapods including humans. Previous works examining the evolution of habitat and host use in this group have been hampered by the lack of a well-resolved phylogeny. In order to produce a robust phylogenetic framework for diphyllobothriideans, we sequenced the complete mitochondrial genome of 13 representatives, carefully chosen to cover the major clades, and two outgroup species representing the Spathebothriidea and Haplobothriidea. In addition, complementary data from the nuclear ribosomal operon was sequenced for 10 representative taxa. Mitogenomes and ssrDNA and lsrDNA were used towards elucidating the phylogenetic framework for the Diphyllobothriidea. The Cephalochlamydidae is confirmed as the earliest diverging diphyllobothriidean lineage, and Solenophoridae and Diphyllobothriidae are sister groups. We infer a probable freshwater origin of the diphyllobothriideans. The ancestral condition for life cycle complexity could not be unambiguously resolved. However, we infer exclusive use of a three-host life cycle following the origin of the Solenophoridae + Diphyllobothriidae. Regarding definitive host use, although we infer reptiles as the most likely ancestral condition, this result should be revisited with a more densely sampled phylogeny in future studies. Freshwater habitat is used by the early diverging lineages within the Solenophoridae + Diphyllobothriidae clade. For the latter, habitat use shifts between freshwater and marine environments, and definitive host use includes marine and terrestrial mammals and birds. We use mitochondrial genomes to distinguish Schistocephalus species occurring in different species of sticklebacks and demonstrate conspecificity of Ligula cf. intestinalis specimens collected from two Fennoscandian ringed seal subspecies.