Blar i forfatter Norges arktiske universitetsmuseum "Elvebakk, Arve"

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    • Alpine garden plants from six continents show high vulnerability to ice encasement 

      Bjerke, Jarle W.; Elvebakk, Arve; Tømmervik, Hans (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-10-27)
      Icy surfaces impose challenges for northern societies, wildlife and agriculture. However, there have been relatively few studies of the impacts of anoxic ground ice on non-agricultural plants. During the winter of 2009–2010, an extreme winter warming event led to thick ground-ice layer development in the world’s northernmost botanical garden in Tromsø, in subarctic Norway, due to much rain on ...

    • Changes in Onset of Vegetation Growth on Svalbard, 2000–2020 

      Karlsen, Stein Rune; Elvebakk, Arve; Tømmervik, Hans; Belda, Santiago; Stendardi, Laura (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-12-15)
      The global temperature is increasing, and this is affecting the vegetation phenology in many parts of the world. The most prominent changes occur at northern latitudes such as our study area, which is Svalbard, located between 76300N and 80500N. A cloud-free time series of MODIS-NDVI data was processed. The dataset was interpolated to daily data during the 2000–2020 period with a 231.65 m pixel ...

    • The Drabo corymbosae-Papaveretea dahliani − a new vegetation class of the High Arctic polar deserts. 

      Daniëls, Fred J. A.; Elvebakk, Arve; Matveyeva, Nadezhda V.; Mucina, Ladislav (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-02-22)
      A new class and a new order (Drabo corymbosae-Papaveretea dahliani and Saxifrago oppositifoliae-Papaveretalia dahliani) have been described, and the Papaverion dahliani validated. This is vegetation of zonal habitats in lowlands of the High Arctic subzone A (or Arctic herb, cushion forb or polar desert subzone) and of ecologically equivalent sites at high altitudes on the mountain plateaus of the ...

    • Gibbosporina cyanea (Pannariaceae), a new bipartite cyanolichen from Sri Lanka with comparisons to related palaeotropical cyanogenera. 

      Elvebakk, Arve (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-07-30)
      Gibbosporina cyanea is described here as new to science, based on its holotype collected in Sri Lanka in the 1860s. The species is a bipartite cyanolichen in contrast to all other known Gibbosporina species, which are tripartites. The species appears to have evolved through cephalodia emancipation followed by divergence. Phyllidia indicate a cephalodiate evolutionary origin with a continued function ...

    • The lichen Allocetraria madreporiformis in high-arctic steppes on Svalbard: a result of out-of-Tibet migration? 

      Elvebakk, Arve; Bjerke, Jarle W.; Nilsen, Lennart (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-01-29)
      <i>Allocetraria madreporiformis</i> is a small, finger-like, fruticose lichen with isolated occurrences in the inner fiord section of the long, straight fiord Wijdefjorden in Svalbard. Several new localities are added and mapped here, and we show that the species is confined to exclusive high-arctic steppe habitats on finetextured, moderately alkaline soil, exposed to wind erosion and aeolian transport ...

    • Pannaria crispella comb. nov. and P. campbelliana Hue, two overlooked lichens from New Zealand 

      Elvebakk, Arve (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-01)
      Psoroma sphinctrinum var. crispellum has been considered a synonym of Pannaria implexa, but it is a distinct species, recombined here as P. crispella. It forms a thin, filmy thallus on tree trunks, and consists of rounded, confluent squamules surrounded by a distinct black prothallus. The apothecia are initially simple with a well-defined central thalline plug. However, the plug soon expands into ...

    • Pannaria microphyllizans (Nyl.) P.M.Jørg. from New Zealand restudied and compared with P. athroophylla (Stirt.) Elvebakk & D.J.Galloway and the three new species Pannaria cassa, P. kantvilasii and P. wrightiorum 

      Elvebakk, Arve (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-07)
      Pannaria microphyllizans, a previously misunderstood species, is shown here to have gibbose perispores with long-tailed apical extensions, and to lack TLC-detectable chemistry. It is related to P. athroophylla, a species with different phyllidia, a chemistry of isovicanicin and leprolomin, and spores of the same type but differing in several details. The latter has been too widely interpreted in ...

    • Pannaria pyxinoides comb. nov., an overlooked lichen from Northern New Zealand 

      Elvebakk, Arve (Journal article; Tidsskriftartikkel, 2018-07)
      The name <i>Psoroma pyxinoides</i>, which has been considered to be a synonym of <i>Pannaria sphinctrina</i>, is shown here to represent a distinct species, differing from <i>P. sphinctrina</i> by thallus characters and in spore and pycnidium morphology. Those characters indicate a relationship with <i>Pannaria allorhiza</i>. Like the latter species, <i>P. pyxinoides</i> is endemic to northern New ...

    • Psoroma femsjonense (Fr.) Trevis., a misunderstood species possibly extinct from Europe 

      Elvebakk, Arve (Journal article; Tidsskriftartikkel; Peer reviewed, 2022)
      Psoroma femsjonense, long considered to be a synonym of P. hypnorum, is shown here to represent a distinct, misunderstood species. The collections seen are from the lowlands of southern Sweden, Denmark, Germany, the Czech Republic, and France. In these areas, the species has not been collected since 1945 and may prove to be regionally extinct from these countries. However, a report indicates that ...

    • Psoroma inflatum, a new alpine lichen from New Zealand 

      Elvebakk, Arve (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-07)
      <i>Psoroma inflatum</i> sp. nov. is described from mountains in Canterbury and Otago in New Zealand’s South Island. It is related to <i>P. hypnorum</i>, but differs in having a strongly inflated and glossy thallus. The squamules are prostrate, ascending or erect, and form brown, coarsely coralloid patches. They lack a dorsiventral morphology and anatomy, in contrast to other Psoroma species, except ...

    • Psoroma nigropunctatum sp. nov., an alpine lichen in south-eastern Australia related to P. buchananii 

      Elvebakk, Arve; Elix, J.A. (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-07)
      <i>Psoroma nigropunctatum</i> is described as new to science, based on collections from alpine and subalpine areas of the Australian Capital Territory, Victoria and New South Wales. It grows on soil or mosses on rock outcrops and in tussock grasslands. It had previously been misidentified as <i>Psoroma hypnorum</i>, but it is more closely related to <i>P. buchananii</i>. The two species have large ...

    • Psoroma spinuliferum (Pannariaceae), a new corticolous lichen species from Alaska with two different types of cephalodia 

      Elvebakk, Arve; Tønsberg, Tor (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-04-30)
      The species <i>Psoroma spinuliferum</i> is described here as new to science. It is only known from the holotype on a <i>Picea sitchensis</i> trunk near a sea-shore in southern, coastal Alaska. The species is distinct in having short, brittle, spinule-like hairs on both apothecium margins, thalline squamules and on pulvinate to coarsely coralloid cephalodia with emerald-colored <i>Nostoc</i> photobionts. ...

    • Spatial and temporal variability in the onset of the growing season on svalbard, arctic Norway - Measured by MODIS-NDVI satellite data 

      Karlsen, Stein Rune; Elvebakk, Arve; Høgda, Kjell Arild; Grydeland, Tom (Journal article; Tidsskriftartikkel; Peer reviewed, 2014)

    • Stepperøyrkvein Calamagrostis purpurascens i Wijdefjorden på Svalbard - einaste lokalitetar i Europa 

      Elvebakk, Arve; Nilsen, Lennart (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-12-24)