Blar i NTNU Open på forfatter "Hassel, Kristian"
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New combinations within the genus Sphagnum (Sphagnaceae, Bryophyta)
Lönnell, Niklas; Hassel, Kristian (Journal article; Peer reviewed, 2018)The genus Sphagnum is known for its morphological variable species, showing plastic responses along environmental gradients (Stenøien et al. 1997). Consequently, species delimitation based on morphological characters is ... -
New national and regional bryophyte records, 52
Ellis, LT; Alatas, M; Aleffi, M; Hassel, Kristian (Journal article; Peer reviewed, 2017) -
Nipdraugmose Anastrophyllum joergensenii - en svært sjelden art tilhørende en eksklusiv gruppe oseaniske levermoser
Hassel, Kristian; Wangen, Kristin; Gaarder, Geir; Jordal, John Bjarne (Journal article; Peer reviewed, 2018)Anastrophyllum joergensenii was described in 1910 based on material collected at Endestadnipa in Flora, Sogn og Fjordane in Norway, by the Norwegian bryologist Eugene Jørgensen. This is, a century later, still a rare species ... -
Phylogenetic structure in the Sphagnum recurvum complex (Bryophyta: Sphagnaceae) relative to taxonomy and geography
Duffy, A; Aguero, Blanka; Stenøien, Hans K.; Flatberg, Kjell Ivar; Ignatov, MS; Hassel, Kristian; Shaw, AJ (Journal article; Peer reviewed, 2020)Premise The Sphagnum recurvum complex comprises a group of closely related peat mosses that are dominant components of many northern wetland ecosystems. Taxonomic hypotheses for the group range from interpreting the whole ... -
Phylogenomic structure and speciation in an emerging model: the Sphagnum magellanicum complex (Bryophyta)
Shaw, A. Jonathan; Piatkowski, Bryan; Duffy, Aaron M.; Aguero, Blanka; Imwattana, Karn; Nieto-Lugilde, Marta; Healey, Adam; Weston, David J.; Patel, Megan N.; Schmutz, Jeremy; Grimwood, Jane; Yavitt, Joseph B.; Hassel, Kristian; Stenøien, Hans K.; Flatberg, Kjell Ivar; Bickford, Christopher P.; Hicks, Karen A. (Peer reviewed; Journal article, 2022)Sphagnum magellanicum is one of two Sphagnum species for which a reference-quality genome exists to facilitate research in ecological genomics. Phylogenetic and comparative genomic analyses were conducted based on ... -
Porella obtusata: distribution, ecology and threats at the west coast of Norway, the northern fringe of its European distribution.
Hassel, Kristian; Johnsen, John Inge; Jordal, John Bjarne; Knutsen, Asbjørn (Journal article; Peer reviewed, 2015)Porella obtusata is a liverwort with a southwestern distribution in Europe. In Norway it is confined to areas with oceanic climate along the west coast, where it also reaches its northern limit. Typically it is growing on ... -
Pyramidula tetragona (Brid.) Brid. rediscovered in Fennoscandia and new to Norway
Høitomt, Torbjørn; Appelgren, Leif; Lönnell, Niklas; Lye, Kåre; Hassel, Kristian (Journal article; Peer reviewed, 2012)The threatened moss Pyramidula tetragona is rediscovered in Fennoscandia and found for the first time in Norway. The species has recently been classified as regionally extinct both in Sweden and Finland, and it is thus ... -
A regionally coherent ecological fingerprint of climate change, evidenced from natural history collections
Speed, James David Mervyn; Evankow, Ann; Petersen, Tanja Kofod; Ranke, Peter Sjolte; Nilsen, Nellie Henriette; Turner, Grace Winifred; Aagaard, Kaare; Bakken, Torkild; Davidsen, Jan Grimsrud; Dunshea, Glenn; Hassel, Kristian; Finstad, Anders Gravbrøt; Husby, Magne; Hårsaker, Karstein; Koksvik, Jan Ivar; Prestø, Tommy; Vange, Vibekke (Peer reviewed; Journal article, 2022)Climate change has dramatic impacts on ecological systems, affecting a range of ecological factors including phenology, species abundance, diversity, and distribution. The breadth of climate change impacts on ecological ... -
Restoring heathlands after afforestation on two islands in western Norway
Saure, Heidi Iren; Vetaas, Ole Reidar; Hassel, Kristian; Vandvik, Vigdis (Peer reviewed; Journal article, 2023)The ongoing loss of red-listed coastal heathlands is a threat to biodiversity and cultural heritage legacies throughout the Atlantic coastal regions of Europe. It is possible to restore degraded and afforested heathlands, ... -
Short stories from Sphagnum of rare species, taxonomy, and speciation
Kyrkjeeide, Magni Olsen; Meleshko, Olena; Flatberg, Kjell Ivar; Hassel, Kristian (Peer reviewed; Journal article, 2023)Conserving species and their genetic variation are a global priority to safeguard evolu-tionary potential in a rapidly changing world. Species are fundamental units in research and nature management, but taxonomic work is ... -
Småkraftverk og sjeldne moser og lav. Kunnskap og kunnskapsmangler
Evju, Marianne; Hassel, Kristian; Hagen, Dagmar; Erikstad, Lars (NINA rapport;696, Research report, 2011)Det er stor og økende interesse for utvikling av småskala vannkraft i Norge. Små kraftverk kan påvirke biologisk mangfold negativt gjennom ødeleggelse, forringelse eller oppsplitting av leveog funksjonsområder. Både i ... -
Spatial genetic structure in Northern European Sphagnum squarrosum Crome in relation to its Arctic morph
Nilsen, Nellie Henriette (Master thesis, 2021)Den arktiske morfen til Sphagnum squarrosum skiller seg fra den typiske Boreale morfen og har morfologiske likheter med S. teres som er nært beslektet og kan ligne på S. squarrosum når den vokser under spesifikke forhold. ... -
Spatial Genetic Structure of the Abundantand Widespread Peatmoss Sphagnummagellanicum Brid .
Kyrkjeeide, Magni Olsen; Hassel, Kristian; Flatberg, Kjell Ivar; Shaw, A. Jonathan; Yousefi, Narjes; Stenøien, Hans K. (Journal article; Peer reviewed, 2016-02-09)Spore-producing organisms have small dispersal units enabling them to become widespread across continents. However, barriers to gene flow and cryptic speciation may exist. The common, haploid peatmoss Sphagnum magellanicum ... -
Sphagnum divinum (sp. nov.) and S. medium Limpr. and their relationship to S. magellanicum Brid.
Hassel, Kristian; Kyrkjeeide, Magni Olsen; Yousefi, Narjes; Prestø, Tommy; Stenøien, Hans K.; Shaw, Jonathan A.; Flatberg, Kjell Ivar (Journal article; Peer reviewed, 2018)Sphagnum magellanicum has been viewed as being a predominantly circumpolar species in the northern hemisphere, but it occurs in the southern hemisphere and was originally described from the southern parts of Chile. It is ... -
Sphagnum incundum a new species in Sphagnum subg. Acutifolia (Sphagnaceae) from boreal and arctic regions of North America
Kyrkjeeide, Magni Olsen; Hassel, Kristian; Shaw, Blanca; Shaw, Jonathan; Temsch, Eva M.; Flatberg, Kjell Ivar (Journal article; Peer reviewed, 2018)We describe Sphagnum incundum in Sphagnum subg. Acutifolia (Sphagnaceae, Bryophyta). We used both molecular and morphological methods to describe the new species. Molecular relationships with closely related species were ... -
Sphagnum magniporosum (Sphagnaceae, subgenus Subsecunda) a new peatmoss species from Venezuela
Flatberg, Kjell Ivar; Hassel, Kristian; Prestø, Tommy; Kyrkjeeide, Magni Olsen; Shaw, A. Jonathan; Ahti, Teuvo (Journal article; Peer reviewed, 2022)We describe Sphagnum magniporosum sp. nov. in Sphagnum subgen. Subsecunda (Sphagnaceae) Bryophyta. The new species is described and characterized using morphological methods. The description is based on qualitative examination ... -
Sphagnum Xlydiae, the first allotriploid peatmoss in the Northern hemisphere
Kyrkjeeide, Magni Olsen; Hassel, Kristian; Aguero, Blanka; Temsch, Eva M.; Afonina, Olga M.; Shaw, A. Jonathan; Stenøien, Hans K.; Flatberg, Kjell Ivar (Journal article; Peer reviewed, 2019)In plants, hybridization between interspecific taxa leading to chromosome doubling seems to happen regularly and may be an important driver of speciation. Allopolyploid species often have morphological traits from both ... -
Studies on genus Aneura (Marchantiophyta, Aneuraceae): typification of Riccardia fuscovirens Lindb.
Söderström, Lars; Hassel, Kristian; Long, David G.; Forrest, Laura L.; Séneca, Ana (Peer reviewed; Journal article, 2022)Riccardia fuscovirens Lindb. is lectotypified and the lectotype is described. It is morphologically very similar to Aneura pinguis and provisionally regarded as synonym to it. -
Tardigrade diversity and community composition across Norwegian boreal forests
Guidetti, Roberto; Jönsson, K. Ingemar; Kaczmarek, Łukasz; Meier, Terje; Speed, James David Mervyn; Prestø, Tommy; Stur, Elisabeth; Topstad, Lasse; Cesari, Michele; Roszkowska, Milena; Zawierucha, Krzysztof; Hassel, Kristian; Ekrem, Torbjørn (Peer reviewed; Journal article, 2023)Tardigrades are common in many terrestrial environments and habitats. Although little is known on their ecological preferences, previous studies found diversity and community composition significantly affected by various ... -
Understanding the Ecology of Three Mixed Northern Hepatic Mat Species at Regional Scale through Species Distribution Modelling, and Local Scale through Growth Measurements and Micro-Climatic Assessment
Wangen, Kristin (Master thesis, 2015)Good knowledge of a species' distribution and ecology is important for a successful management. The distribution of species is determined by many factors, among others climatic and topographic factors determining their ...