Browsing Naturhistorisk museum by Title
Now showing items 261-280 of 745
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(Doctoral thesis / Doktoravhandling, 2009)The Gardnos structure in Hallingdal, Norway is an eroded impact crater, presently consisting of impactites and crater infill sediments exposed within a roughly circular area of about five km diameter. Investigations in ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)The Generic Ecological Impact Assessment of Alien Species (GEIAA) is described. It comprises a set of criteria and an assessment procedure. The set of criteria consists of three criteria that quantify invasion potential, ...
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(Doctoral thesis / Doktoravhandling, 2007)The mapping of genealogical relationships between individuals, populations, subspecies and species is important for studies of evolutionary processes and biodiversity, and for conservation decisions. In this thesis, I have ...
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(Doctoral thesis / Doktoravhandling, 2012)The process of speciation is the splitting of single populations into two or more distinct, reproductively isolated taxa. Common modes of speciation are sympatric, allopatric and parapatric speciation, with speciation in ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)Individual heterozygosity may influence the expression of fitness‐related traits, via genome‐wide or local genetic effects. Earlier studies have shown negative relationships between heterozygosity and sperm variation, ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2016)Background The population size of Atlantic walruses (Odobenus rosmarus rosmarus) is depleted relative to historical abundance levels. In Svalbard, centuries of over-exploitation brought the walrus herds to ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)Abstract In northern European Cochlearia (Brassicaceae), considerable chromosome variation has taken place without corresponding morphological differentiation, resulting in an intricate species complex including ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)The scattered eastern African high mountains harbor a renowned and highly endemic flora, but the taxonomy and phylogeographic history of many plant groups are still insufficiently known. The high-alpine populations of the ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2014)Crossing experiments indicate that hybrid sterility barriers frequently have developed within diploid, circumpolar plant species of the genus Draba. To gain insight into the rapid evolution of postzygotic reproductive ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2011)Background Cyanobacteria belong to an ancient group of photosynthetic prokaryotes with pronounced variations in their cellular differentiation strategies, physiological capacities and choice of habitat. ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)Abstract The macroscopic single-celled green alga Acetabularia acetabulum has been a model system in cell biology for more than a century. However, no genomic information is available from this species. Since the alga has ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)Extant Canis lupus genetic diversity can be grouped into three phylogenetically distinct clades: Eurasian and American wolves and domestic dogs.1 Genetic studies have suggested these groups trace their origins to a wolf ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)Many species, including humans, have emerged via complex reticulate processes involving hybridisation. Under certain circumstances, hybridisation can cause distinct lineages to collapse into a single lineage with an admixed ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 1999)The genus Nothochrysa is reported for the first time from Norway. The two species N. flaviceps (Stephens, 1836) and N. capitata (Fabricius, 1793) were captured in light-traps in Kristiansand (VAY) in 1999. The biology and ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)Most pegmatites of southern Norway seem to be derived from anatectic melting of metamorphic rocks during the Sveconorwegian orogeny rather than to be highly evolved residual melts derived from granites. We test this ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)Aim To investigate the geographic patterns and ecological correlates in the geographic distribution of the most common tree dispersal modes in Amazonia (endozoochory, synzoochory, anemochory and hydrochory). We examined ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)Long-term observations of ice phenology in lakes are ideal for studying climatic variation in time and space. We used a large set of observations from 1890 to 2020 of the timing of freeze-up and break-up, and the length ...
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(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)Aim Biodiversity hotspots are widely used as conservation priorities to preserve the tree of life. However, many conservation practices identify biodiversity hotspots without considering phylogenetic diversity (PD), ...
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(Doctoral thesis / Doktoravhandling, 2009)As a starting point GIS (geographical information systems) seem intuitively to be a practical tool for biologists performing ecological research. GIS conveniently stores, explores, analyses and visualizes biological/ecol ...
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(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2017)Glaciers cover ∼10% of the Earth’s land surface, but they are shrinking rapidly across most parts of the world, leading to cascading impacts on downstream systems. Glaciers impart unique footprints on river flow at times ...