A Taxonomic Revision of the Marine Species of Cladophora (Chlorophyta) along the Coasts of Japan and the Russian Far-east
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This study presents a taxonomic revision of the genus Cladophora (Chlorophyta. Cladophorophyceae. Cladophorales) for the NW Pacific shores of Japan and the Russian Far-east. Within the genus Cladophora it is possible to distinguish world-wide 11 different architectural types. Of these, 9 have been encountered on the NW Pacific shores. These architectural types represent the sections of Cladophora as here conceived : Repentes (ch. 4); Aegagropila (ch. 5); Boodleoides (ch. 6); Rugulosae (ch. 7); Longiarticulatae s. s.(ch. 8); Glomeratae (ch. 9); Rupestres s. s.(ch. 10); Willeella (ch. 11); Cladophora (ch. 12). By and large, these sections have been also recognized in previous studies (van den Hoek, 1963,1982a, 1984a), but a few alterations are here proposed. 32 species and varieties are recognized; eight of these are new to science. Section Repentes Kutz. contains the following three species in the NW Pacific : C. coelothrix Kutz., C. socialis Kutz., C. sibogae Reinbold. Section Aegagropila (Kutz.) Hansg. contains one species : C. catenata (L.) Kutz. emend. van den Hoek. Section Boodleoides van den Hoek contains the new species C. pachyliebetruthii nov. spec. Section Rugulosae Sakai encompasses the following five taxa : C. prolifera (Roth) Kutz., C. wrightiana Harvey var. wrightiana, C. wrightiana var. minor nov. var., C. aokii Yamada, C. horii nov. spec. Section Longi-articulatae Hamel s. s. harbours the following seven taxa : C. japonica Yamada var. japonica, C. japonica var. kajimurae nov. var., C. ohkuboana Holmes, C. dotyana Gilbert, C. sakaii Abbott, C. minisakaii nov. spec., C. stimpsonii Harvey. Section Glomeratae Kutz. s. l. contains the following 10 species : C. albida (Nees) Kutz., C. opaca Sakai, C. flexuosa (Mull.) kutz., C. conchospheria Sakai, C. penicillioides nov. spec., C. vagabunda (L.) van den Hoek, C. laetevirens (Dillw.) Kutz., C. dalmatica Kutz., C. hutchinsioides van den Hoek & Womersley, C. enomotoi nov. spec. Section Rupestres Kutz. s. s. contains one species : C. rupestris (L.) Kutz. Section Willeella harbours C. ordinata (Boerg.) van den Hoek. Section Cladophora encompasses three species : C. liniformis Kutz., C. oligoclada Harv., and C. oligocladoidea nov. spec. Detailed descriptions and pictures of all the above taxa are presented, as well as a dichotomous identification key (ch. 2). Cladophora is not monophyletic, but paraphyletic. This conclusion is reached on the basis of morphological, and molecular data in the recent literature. Arguments, largely of a practical nature, are presented why the genus is here maintained (ch. 3). Arguments are presented for the hypothesis, that Cladophora and Cladophorales are principally a tropical clade, of which only a limited number of species have succeeded to penetrate into temperate waters. Of the 32 species and varieties encountered in the NW Pacific 19 are tropical or tropical to warm-temperate; one species is tropical to temperate; one species tropical to Arctic; four species are eurythermal temperate; and four species stenothermal temperate. Interestingly, northern boundaries of 11 species (or pairs of narrowly related species) occurring in the NW Pacific as well as in the N Atlantic extend in the latter ocean to significantly lower temperatures in the north. Possibly the much more severe glacial-interglacial climatic shifts in the Atlantic Ocean than in the Pacific Ocean have facilitated selection pressure towards lower temperature ecotypes (ch. 3).
- 国立科学博物館の論文
- 2000-12-22