71. |
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72. |
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73. |
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74. |
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75. |
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76. |
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77. |
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78. |
- Hedrén, Mikael
(författare)
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Speciation and relationships in Dactylorhiza
- 2005
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Ingår i: Svensk Botanisk Tidskrift. - 0039-646X. ; 99:2, s. 70-93
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Most of the Scandinavian members of the orchid genus Dactylorhiza are included in the D. incarnata/D. maculata polyploid complex. Molecular data obtained during the last decade have given a better understanding of evolutionary patterns in this complex and explain why it is taxonomically difficult. The data reveal that allotetraploids have been formed repeatedly by hybridization between the same pair of broadly defined parental species, D. incarnata s.lat. and D. maculata s.lat. Some of the widespread allotetraploids are themselves variable and may each consist of several independently derived allotetraploid lineages, or else may have obtained increased levels of diversity by backcrossing with their parental species or by hybridization with other allotetraploids. Whereas some allotetraploids have wide distribution areas indicating that they should be of relatively high age, other allotetraploids, which may be characterized by odd character combinations, are confined to one or a few populations and may be of recent origins. Because of the intricate variation patterns and the difficulty to subdivide the complex into a series of morphologically discrete species, it is argued that all allotetraploids are best included in a broadly circumscribed D. majalis, at least until additional molecular data regarding taxonomic delimitation have been obtained. Widespread and well-known taxa may be provisionally treated as subspecies.
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79. |
- Helldin, Jan Olof, et al.
(författare)
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Så har blomsterlupin spridit sig i Mellansverige
- 2022
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Ingår i: Svensk Botanisk Tidskrift. - 0039-646X. ; 116, s. 112-119
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Tidskriftsartikel (refereegranskat)abstract
- Garden lupin Lupinus polyphyllus is one of the most problematic invasive alien plant species in Sweden. It is particularly common in road verges where they may threaten biodiversity. We present the results from a study of the distribution of garden lupins in the road network in a 130 km2 area in south central Sweden, following a new census method intended to function as a standard for the Swedish Transport Administration. The complete road network in the area was censused (192 km), from highway to minor forest roads. Lupin stands were found in ~4 percent of major roads and ~2 percent of minor, private roads; yet most lupin stands were found in the minor roads because minor roads are more abundant. A majority of lupin stands (76%) were concentrated around houses with gardens, indicating gardens as the primary source for lupins in the area. The authors propose a strategy for lupin control depending on density: large, dense stands are contained, small stands are eradicated, only lupin free soil is used in road management and local actors are informed in order to prevent further spread.
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80. |
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