Browsing by Author "Hultander, Erik"

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    En återinventering och analys av den svenska populationen av svart nervmossa (Campylopus atrovirens)
    (2025-04-04) Hultander, Erik; University of Gothenburg / Department of Biological and Environmental Sciences; Göteborgs universitet / Instiutionen för biologi och miljövetenskap
    Bristly swan-neck moss (Campylopus atrovirens) is in Sweden a very rare moss that only grows on a few blocks and cliffs around Gothenburg. The species can globally only be found in areas with high precipitation. Rain fall in Gothenburg has increased with a stronger greenhouse effect. Air pollution in Gothenburg has also improved. Mosses generally benefit from these conditions and this papers hypothesis is that the population of the species has grown because of these more beneficial conditions. Data was collected through field excursions to the same locations that bristly swan-neck moss was inspected during 1977–1978. The population was measured in its entirety and information about the locations properties was collected through random placements of a grid that gave information about the species frequencies. This information combined with indicator values gives values for light, moisture, rection, nitrogen and how much heavy metals the locations have. The results of this paper show that two locations have decreased in size, two are basically the same and one has increased. The locations that have decreased in size mainly seem to be dry, but they also seem to lack suitable places to grow and are often shaded by trees. The unchanged populations have a lot of water but lack light. They seem to spread but not be able to grow large. The location where the population has grown is the most exposed to sun and is surprisingly dry. The increase might be due to low competition with other moss species, temporary wetter periods which lets the population survive and the high amount of sunlight which is only slightly obscured by the deciduous forest. The population has grown but all growth comes from one location. Light and moisture appears to be the most important factors for success.