| 81. |
- Johansson, P, et al.
(författare)
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The lichen flora of Stora Karlsö and Lilla Karlsö
- 2000
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Ingår i: Svensk Botanisk Tidskrift. - 0039-646X. ; 94:4, s. 205-254
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- In 1993-1998 the lichen flora of Stora Karlso and Lilla Karlso was surveyed. These two nearby islands are situated outside the west coast of Gotland, Sweden, in the Baltic Sea. In all, 355 species were found, including three lichenicolous fungi. Two species are new to Sweden, viz. Lepraria flavescens and Placynthium lismorense. Both were found on limestone. The number of species according to habitat was: limestone 105, gravel alvar 84, grass alvar 17, siliceous rocks 88, sea-shore rocks 20, bark (mostly deciduous trees) 121 and wood 52. During the last hundred years the management and thereby plant succession have differed between the islands. Sheep has continuously grazed Lilla Karlso, while the sheep were removed in 1887 from Stora Karlso. Floristic differences of the lichen flora between the islands are discussed from this aspect. The succession of deciduous forest on Stora Karlso is important for the species composition of the epiphyte flora. Some phytogeographical aspects are also discussed. Several common lichen species in southern Sweden are rare or not found on Stora Karlso and Lilla Karlso, e.g. the sorediate species Buellia griseovirens, Pertusaria amara and Phlyctis argena. In contrast, the otherwise rare calcicolous Gyalecta subclausa is common on the islands. With the aim of studying the lichen flora of gravel alvar in detail, this habitat was surveyed in sample-plots. The overall species richness of the gravel alvar is higher on Stora Karlso, mainly due to the larger area of this habitat. The mean species richness in the sample-plots is however similar on both islands, with on average 15 species/dm2. The most species-rich dm2 sample-plot with 23 species was encountered on Stora Karlso. The species composition of the gravel alvar differs between the islands; e.g. on Stora Karlso Collema tenax, Fulgensia fulgens, Psora decipiens and Squamarina cartilaginea are more abundant. This may be caused by different management regimes. However, it is hard to distinguish the effects of differences in habitat area, habitat quality and sheep grazing. The most obvious effect of grazing on the terricolous lichens is the change of growth form of the Cladonia species. This was seen both by a comparison of the lichen individuals of the two islands and by following the macrolichens in an area where sheep were re-introduced on Stora Karlso in 1995. Cladonia arbuscula, C. portentosa and C. rangiferina grow in dense cushions in areas without sheep, while they grow scattered in areas with sheep. This is probably caused by the mechanical action of sheep trampling.
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| 82. |
- Johansson, Victor, et al.
(författare)
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Brist på gamla ekar hotar lavar
- 2013
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Ingår i: Svensk Botanisk Tidskrift. - 0039-646X. ; 107, s. 344-349
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Tidskriftsartikel (refereegranskat)
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| 83. |
- Johansson, Victor, et al.
(författare)
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Brist på gamla ekar hotar lavar : [Old oaks and lichens]
- 2013
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Ingår i: Svensk Botanisk Tidskrift. - Uppsala : Svenska Botaniska Föreningen. - 0039-646X. ; 107:6, s. 344-349
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Flera ovanliga lavar har sina främsta förekomster på gamla ekar i sydöstra Sverige. Men gamla ekar uppstår inte av sig själva. Det måste helatiden finnas yngre träd som kan efterträda de gamla. Artikelförfattarnahar med hjälp av statistiska modeller försökt förutsäga vad som kommer att hända med fem olika lavar om de gamla ekarna försvinner.
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| 84. |
- Johansson, Victor, et al.
(författare)
-
Hur släpps mossornas sporer?
- 2014
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Ingår i: Svensk Botanisk Tidskrift. - 0039-646X. ; 108, s. 254-259
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Tidskriftsartikel (populärvet., debatt m.m.)abstract
- Att saltkornen inte rinner ur ströaren om man inte skakar på den är bekant. På liknande vis verkar det förhålla sig med sporerna i mossornas sporkapslar.
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| 85. |
- Johansson, Victor, et al.
(författare)
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Hur släpps mossornas sporer?
- 2014
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Ingår i: Svensk Botanisk Tidskrift. - Uppsala : Svenska Botaniska Föreningen. - 0039-646X. ; 108:5, s. 254-259
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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| 86. |
- Johansson, Victor, et al.
(författare)
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Polylepis trotsar höjderna i Argentina
- 2010
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Ingår i: Svensk Botanisk Tidskrift. - Uppsala : Svenska Botaniska Föreningen. - 0039-646X. ; 104, s. 316-320
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Tidskriftsartikel (populärvet., debatt m.m.)
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| 87. |
- Johnsson, Pav, et al.
(författare)
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En botanisk skvader
- 2023
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Ingår i: Svensk Botanisk Tidskrift. - 0039-646X. ; 117:1, s. 34-39
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Tidskriftsartikel (populärvet., debatt m.m.)
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| 88. |
- Karlsson, Laila, et al.
(författare)
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Enset - en mångsidig etiopisk gröda
- 2014
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Ingår i: Svensk Botanisk Tidskrift. - 0039-646X. ; 108:1, s. 34-41
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Tidskriftsartikel (refereegranskat)
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| 89. |
- Karlsson Strese, Else-Marie, et al.
(författare)
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Den svenska humlens ursprung
- 2012
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Ingår i: Svensk Botanisk Tidskrift. - Uppsala : Svenska Botaniska föreningen. - 0039-646X. ; 106:3-4, s. 165-176
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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| 90. |
- Karlsson, T, et al.
(författare)
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Changes in the Hieracium flora in the Nässjö area (Småland, S Sweden) during the 20th century(Skogs- och hagfibblor i nässjötrakten i åttio års perspektiv)
- 2005
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Ingår i: Svensk Botanisk Tidskrift. - 0039-646X. ; 99:3-4, s. 187-207
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The Hieracium flora in an area of 1250 km(2) centred around the town of Nassjo, S Sweden, was investigated in 1924-30 and again in 2004. In all, 101 species of the sections Hieracium and Vulgaria were found, 89 in the 1920s and 85 in 2004, i.e. approximately the same number. However, the number of species per 5 by 5-km area has been strongly reduced, and the decline is even more pronounced for 1 by 1-km areas. This implies that Hieracium species have generally become much rarer If the sample from the 1920s is unbiased, species of sect. Hieracium have declined more than those of sect. Vulgaria. In the 1920s, the main Hieracium habitat was wooded meadows cut for hay after mid-summer; hawkweeds were a conspicuous and species-rich element of their vegetation. Today, almost all the former hay-meadows have changed into forest or manured grassland, and the hawkweeds are usually gone. Species of sect. Vulgaria are now mainly fond on roadsides (70% of all localities) whereas those of sect. Hieracium prefer woodland (63% of all localities). However, species of the Bifida group within sect. Hieracium have the same habitat preferences as sect. Vulgaria. - Two species are new to the province of Smaland, viz. H. constringens Norrl. and H. expallidiforme (Dahlst. ex Stenstr) Dahlst. Names in Swedish are provided.
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