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- Xanthoria
- I am a biologist, lichenologist, and philatelist. I have been keeping a diary/weblog on the internet for many years. And I have been keeping a paper diary on and off for 48 years.
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1 comment:
Abstract: Observations of two apparent phenotypic expressions (morphodemes) of the composite thallus of the lichen-forming ascomycete species Ricasolia amplissima (Scop.) De Not. (formerly Lobaria amplissima (Scop.) Forss.) inspired us to investigate the morphological and genetic variation of the species in Norway. The morphodemes differ in thallus shape and occurrence of apothecia and/or cephalodia, each dominating in climatically different parts of southern Norway. We investigated the morphology of herbarium collections as well as fresh samples from various areas, including localities where the two morphodemes occur together. The nrITS barcode marker was sequenced to investigate the genetic variation along the climatic gradient of the Hardangerfjord area. We also included barcode sequences of specimens from other parts of the world in order to establish if the Norwegian pattern of variation has a wider geographical significance. Results suggest that the genetic variation found in Ricasolia amplissima corresponds to morphology independently of geography/climate. The two haplotype groups clusters in two distinct sister clades, however, the within-species variation is too small to justify taxonomic recognition. Specimens with the cephalodiate morphodeme and its haplotypes are mainly found in the oceanic west, whereas specimens with apotheciate morphodemes and its haplotypes occur mainly in the drier eastern parts. The results can be interpreted as 1) immigration to Norway from different gene pools in separate glacial refugia, or, 2) natural selection for water efficient cephalodiate morphodemes in the oceanic west and apotheciate (sexually reproducing) in drier suboceanic east parts of Norway. We argue that within-species genetic variation should always be considered before conservation actions such as transplants of lichen thalli are taken.
Key words: genetic variation, lichen-forming fungi, Lobariaceace, morphodemes, phenotypic expression
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