Abstract
Two morphotypes of Dictyota dichotoma of uncertain taxonomic status have been identified in Korea. The broad thallus type is common on the south and east coasts of Korea, and is similar to European D. dichotoma in gross morphology. The slender thallus type is only found on the west coast. Morphological differences between the two plant types are evident in their thallus width, their terminal bifurcations, the shapes of apices, and their thallus thickness. The differences in the size and shape of the tetrasporangia and tetraspores are also notable. Plants from the east coast exhibit a dominant asexual annual life-cycle involving sporophytes but not gametophytes, and maintain their population by the production of in-situ germlings. In the slender plants from the west coast, a sexual life-cycle dominates. The rbcL, rbcS, psaA and psbA gene sequence differences between the two morphotypes were congruent with morphological, anatomical and phenological characteristics. In spite of these differences, there is no known inbreeding barrier between these two morphotypes. The Lm/Lc values of the second internodes from two types are also within the range of the species criterion specified by Hörnig et al. These results suggest that the two types of D. dichotoma from Korea should be classified as a single species and that they may be in the process of speciation due to geographical isolation (allopatric speciation).
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References
Boo SM, Lee IK (1983) A life history and hybridization of Antithamnion sparsum Tokida (Rhodophyta, Ceramiaceae) in culture. Korean J Bot 26:141–150
Chun J (1995) Computer-assisted classification and identification of actinomycetes. PhD Thesis, University of Newcastle
De Clerck O (2003) The genus Dictyota (Dictyotales, Phaeophyta) in the Indian Ocean. Meise. National Botanic Garden of Belgium
De Toni GB (1891) Systematische Uebersicht der bisher bekannten Gattungen der echten Fucoideen. Flora 74:171–182
Doyle JJ, Doyle JL (1987) A rapid DNA isolation procedure for small quantities of fresh leaf tissue. Phytochem Bull 19:11–15
Farris JS, Källersjö M, Kluge AG, Bult C (1995) Testing significance of incongruence. Cladistics 10:315–319
Felsenstein J (1985) Confidence limits on phylogenies: an approach using the bootstrap. Evolution 39:783–791
Hörnig I, Schnetter R, Prud’homme van Reine WF (1992a) The genus Dictyota (Phaeophyceae) in the North Atlantic. I. A new generic concept and new species. Nova Hedwigia 54:45–62
Hörnig I, Schnetter R, Prud’homme van Reine WF (1992b) The genus Dictyota (Phaeophyceae) in the North Atlantic. II. Key to the species. Nova Hedwigia 54:397–402
Hudson W (1762) Flora anglica, 2nd edn. Noure, London
Kang JW (1966) On the geographical distribution of marine algae in Korea. BullPusan Fish Coll 7:1–125
Lamouroux JVF (1809) Observations sur la physiologie des algues marines, et description de cinq noveaux genres de cette famille. Nouv Bull Sci Soc Philom Paris 1:330–333
Lee IK, Kang JW (1986) A check list of marine algae in Korea. Korean J Phycol 1:311–325
Lee RE (1999) Phycology, 3rd edn. Cambridge University Press, Cambridge
Lee WJ, Bae KS (2002) Phylogenetic relationship among several genera of Dictyotaceae (Dictyotales, Phaeophyceae) based on 18S rRNA and partial rbcL gene sequences. Mar Biol 140:1107–1115
Lee WJ, Kim KY (1997) Taxonomic study of Dictyota dichotoma (Phaeophyta) on morphological variation of four local populations from Korea. Korean J Phycol 2:83–91
Okamura K (1913–1915) Icones of Japanese algae, vol 3. Tokyo
Posada D, Crandall KA (1998) MODELST; testing the model of DNA substitution. Bioinformatics 14:817–818
Provasoli L (1968) Media and prospects for the cultivation of marine algae. In: Watanabe A, Hattori A (eds) Culture and collections of algae. Proc U.S.-Japan Conf Hakone, Sept. 1966. Jpn Soc Plant Physiol, pp 63–75
Roberts M (1966) The Phaeophyceae, part II. In: Godward MBE (ed) The chromosomes of algae. Arnold, London, pp 149–167
Rodriguez F, Oliver A, Marin A, Medina JR (1990) The general stochastic model of nucleotide substitution. J Theor Biol 142:485–501
Rzhetsky A, Nei M (1992) A simple method for estimating and testing minimum evolutionary trees. Mol Biol Evol 9:945–967
Schnetter R, Hörnig I, Weber-Peukert G (1987) Taxonomy of some North Atlantic Dictyota species (Phaeophyta). Hydrobiologia 151/152:193–197
Swofford DL (2003) PAUP phylogenetic analysis using parsimony. Version 4.0b10. Sinauer, Sunderland, Mass
Thompson JD, Higgins DG, Gibson TJ (1994) CLUSTAL W: improving the sensitivity of progressive multiple sequence alignment through sequence weighting, position-specific gap penalties and weight matrix choice. Nucleic Acids Res 22:4673–4680
Womersley HBS (1987) The marine benthic flora of Southern Australia part II. South Australian Government Printing Division, Adelaide
Yoon HS, Hackett JD, Bhattacharya D (2002) A single origin of the peridinin- and fucoxanthin-containing plastids in dinoflagelates through tertiary endosymbiosis. Proc Natl Acad Sci USA 99:11724–11729
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This study was partially supported by KRF Grant 2002-070-C00083 to W.J. Lee.
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Communicated by O. Kinne, Oldendorf/Luhe
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Hwang, IK., Kim, HS. & Lee, W.J. Polymorphism in the brown alga Dictyota dichotoma (Dictyotales, Phaeophyceae) from Korea. Marine Biology 147, 999–1015 (2005). https://doi.org/10.1007/s00227-005-1623-8
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DOI: https://doi.org/10.1007/s00227-005-1623-8