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  • [1]234567...8Nästa
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2.
  • Backéus, Ingvar (författare)
  • Grönlands växtvärld
  • 2012
  • Ingår i: Svensk Botanisk Tidskrift. - 0039-646X. ; 106:1, s. 11-23
  • Tidskriftsartikel (populärvet., debatt m.m.)abstract
    • Flora, vegetation and land-use history of Greenland are briefly described. The species-poor flora is Arctic. Thirteen endemic taxa may have survived the glacial period on Greenland.The latitudinal vegetation zones extend from High Arctic deserts to Low Arctic heaths with erect shrubs. A small area in the SW is Subarctic with elfin forests and meadows. A corresponding altitudinal zonation is also described.Greenland was colonised 1000 years ago by both Inuits and Norse settlers. The latter practised animal husbandry in the Subarctic SW. Hay-making was extensive on fertilized and irrigated fields. Extensive deforestation and land degradation took place, until the Norse population disappeared in the 15th century. It is argued that the decreasing population on Iceland during late medieval times made it possible for the Greenlandic Norse to move there. Modern sheep holdings have again caused land degradation. Notes on small-scale forest plantation and on ethnobotany are given.
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5.
  • Backéus, Ingvar (författare)
  • I västerled till Shetland
  • 1983
  • Ingår i: Svensk Botanisk Tidskrift. - 0039-646X. ; 77, s. 26
  • Recension (populärvet., debatt m.m.)
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6.
  • Backéus, Ingvar (författare)
  • Kartläggningen av nationallandskapet
  • 2004
  • Ingår i: Svensk Botanisk Tidskrift. - 0039-646X. ; 98:3-4, s. 207-212
  • Tidskriftsartikel (populärvet., debatt m.m.)abstract
    • The late 19th and early 20th century was a time of intensive geological surveys, carried out in an atmosphere of national romanticism. This period has been described in a recent book by science historian Christer Nordlund, which is here presented and commentd on. Of special interest in Sweden was the issue of posglacial land upheaval and its consequencies for the development of the Baltic Sea. Special emphasis in the book is put on the importance of the geological results for plant geography and archaeology. The two botanists Gunnar Andersson and Rutger Sernander were active in this borderland between botany and geology. As scientists they represented very different mentalities and they soon became enemies. Andersson remained sceptical of the postglacial climate scheme developed by Blytt and Sernander, which he considered founded on too few data. A major scientific schism developed which culminated at the International Geological Congress in Stockholm in 1910. Nordlund is probably right in his view that the interdisciplinary work in the late 19th century relating to historical plant geography and geological development had an impoartant impact on early ecology and its formation as a science.
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7.
  • Backéus, Ingvar (författare)
  • Myrar i Örebro län
  • 1984
  • Ingår i: Svensk Botanisk Tidskrift. - 0039-646X. ; 78, s. 21-44
  • Tidskriftsartikel (refereegranskat)
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9.
  • Beckman, Jenny (författare)
  • Amatörbotanikens 1900-tal
  • 2007
  • Ingår i: Svensk botanisk tidskrift. - 0039-646X. ; 101:1, s. 55-64
  • Tidskriftsartikel (refereegranskat)
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10.
  • Björn, Lars Olof, et al. (författare)
  • Dinoflagellater
  • 2005
  • Ingår i: Svensk Botanisk Tidskrift. - 0039-646X. ; 99:1, s. 7-16
  • Tidskriftsartikel (refereegranskat)abstract
    • The dinoflagellates constitute a group within the protistan supergroup Alveolata, and can be referred neither to the plant nor the animal kingdom. They swim about using two flagella and are able to orient using various stimuli. About half the living dinoflagellate species are capable of oxygenic photosynthesis, but most of them complement this with capture of prey. Some live ebtirely by capturing small organisms, others are parasites. Some species are able to emit light. The group has a long evolutionary history, and almost as many extinct species as extant ones have been described. Most remarkable is the way the photosynthetically potent dinoflagellates have aquiered their chloroplasts by endosymbiosis with photosynthetic organisms from many different groups. In some cases repeated endosymbiontic events have taken place.
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  • Resultat 1-10 av 79
  • [1]234567...8Nästa
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