Abstract
Abstract An assessment of the 11 species of bladed Bangiales from Iceland in a collection of approximately 1770 specimens collected between 1883 and 2013 was undertaken by combining results from molecular analysis with examination of morphological variation in order to determine their distribution in detail. Seven of the species grow all around Iceland. Of the remaining four species, Porphyra linearis, P. dioica and Pyropia leucosticta have their northern limit of distribution along the southwestern and western part of the country, and Pyropia thulaea, an arctic species, only grows at the eastern coast, which is the coldest part of the coastline. Detailed reliable records of species distribution are important to detect future changes in the flora due to anthropogenic or natural environmental changes and have implications for conservation policy.
Highlights
The bladed Bangiales are a large, cosmopolitan group of red algae that were placed in the genus Porphyra until the revision of Sutherland et al (2011)
This study revealed that there were 11 species (Table 1), five more than the number previously reported by Gunnarsson and Jónsson (2002): Porphyra amplissima, P. dioica, P. linearis, P. miniata, P. purpurea, P. umbilicalis), and belonging to four of the nine genera of bladed Bangiales: Boreophyllum, Porphyra, Pyropia and Wildemania
P. linearis and Pyropia leucosticta are confined to the south-western part of Iceland
Summary
The bladed Bangiales are a large, cosmopolitan group of red algae that were placed in the genus Porphyra until the revision of Sutherland et al (2011). The morphological identification of these species has been regarded as highly problematic because of the difficulty of finding reliable morphological characters and the variation within and between species. On the basis of a two-gene phylogeny, Sutherland et al (2011) split the genus into eight genera: Boreophyllum, Clymene, Fuscifolium, Lysithea, Miuraea, Porphyra, Pyropia and Wildemania. One of the consequences of this revision is that we are in a position to re-evaluate local and regional Bangiales floras. The difficulty of distinguishing species remains, generic circumscriptions enable better placement at the generic level which in turn enables us to focus on species present at the regional and local level
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