caa a22 4500 37885996X CHVBK 20180305123344.0 cr unu---uuuuu 161128e20030310xx s 000 0 eng 10.1515/BOT.2003.020 doi (NATIONALLICENCE)gruyter-10.1515/BOT.2003.020 A Molecular Investigation of Mazzaella (Gigartinales, Rhodophyta) Morphologically IntermediateBetween Mazzaella linearis and M. splendens [Elektronische Daten] [P. J. Ross, S. L. Donaldson, G. W. Saunders] The red algal genus Mazzaella presents an interesting challenge to systematists and ecologists. The two species M. linearis and M. splendens are easily distinguished in their ideal form; however, in areas of intermediate wave exposure individuals form a seemingly continuous grade between the two species. On the basis of ecological investigations, it was concluded that the two forms are distinct at the species level and that plants of intermediate morphology can be best assigned to M. splendens. Field-identified ‘classic' M. linearis and M. splendens (17 individuals each), as well as individuals of intermediate morphology (20 individuals), were collected. Sequences of the internal transcribed spacer (ITS) of the ribosomal cistron were determined for all of these individuals, as well as for related Mazzaella spp. Molecular phylogenetic analyses confirmed a close relationship between M. linearis and M. splendens, and identified their closest relative, M. sanguinea. Pairwise distance comparisons within M. splendens (including intermediate plants; 0-4 differences) and M. linearis (0-2 differences) were less than variation between species (8-12 differences), and both solidly clustered as monophyletic (M. sanguinea as outgroup; 0-2 differences among four isolates) confirming the results of the ecological investigations. Two further aspects of the earlier ecological studies are also discussed: the conclusion that stipe length is a reliable character for distinguishing between these two species; and, a suggestion that M. splendens displays a slightly heteromorphic alternation of generations, the plants of intermediate morphology being tetrasporophytes (preferring the moderately wave-exposed habitats) whereas the ‘classic' M. splendens are gametophytic with a preference for wave-sheltered habitats. Copyright © 2003 by Walter de Gruyter GmbH & Co. KG Hydrobiology nationallicence Mycology, fungi nationallicence Botany & plant sciences nationallicence Ross P. J. aut Donaldson S. L. aut Saunders G. W. aut Botanica Marina Walter de Gruyter 46/2(2003-03-10), 202-213 0006-8055 46:2<202 2003 46 botm https://doi.org/10.1515/BOT.2003.020 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1515/BOT.2003.020 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ross P. J. aut NATIONALLICENCE 700 1- Donaldson S. L. aut NATIONALLICENCE 700 1- Saunders G. W. aut NATIONALLICENCE 773 0- Botanica Marina Walter de Gruyter 46/2(2003-03-10), 202-213 0006-8055 46:2<202 2003 46 botm CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter