Abstract
The zoanthid genus Isaurus (Anthozoa: Hexacorallia) is known from both the Indo-Pacific and Atlantic Oceans, but phylogenetic studies examining Isaurus using molecular markers have not yet been conducted. Here, two genes of markers [mitochondrial cytochrome oxidase subunit I (COI) and mitochondrial 16S ribosomal DNA (mt 16S rDNA)] from Isaurus specimens collected from southern Japan (n = 19) and western Australia (n = 3) were sequenced in order to investigate the molecular phylogenetic position of Isaurus within the order Zoantharia and the family Zoanthidae. Additionally, obtained sequences and morphological data (polyp size, mesentery numbers, mesogleal thickness) were utilized to examine Isaurus species diversity and morphological variation. By comparing our obtained sequences with the few previously acquired sequences of genera Isaurus as well as with Zoanthus, Acrozoanthus (both family Zoanthidae), and Palythoa spp. (family Spenophidae) sequences, the phylogenetic position of Isaurus as sister to Zoanthus within the Family Zoanthidae was suggested. Based on genetic data, Isaurus is most closely related to the genus Zoanthus. Despite considerable morphological variation (in particular, polyp length, mesentery numbers, external coloration) between collected Isaurus specimens, all specimens examined are apparently conspecific or very closely related based on molecular data and observed morphological variation within colonies. Additionally, obtained internal transcribed spacer of ribosomal DNA (ITS-rDNA) sequences from symbiotic zooxanthellae (Symbiodinium spp.) from all Isaurus specimens were shown to be subclade C1-related Symbiodinium.
Similar content being viewed by others
References
Baillie BK, Belda-Baillie CA, Maruyama T (2000) Conspecificity and Indo-Pacific distribution of Symbiodinium genoptypes (Dinophyceae) from giant clams. J Phycol 36:1153–1161
Fautin DG (2006) Hexacorallians of the World. http://geoportal.kgs.ku.edu/hexacoral/anemone2/index.cfm
Gascuel O (1997) BIONJ: an improved version of the NJ algorithm based on a simple model of sequence data. Mol Biol Evol 14:685–695
Guindon S, Gascuel O (2003) A simple, fast, and accurate algorithm to estimate large phylogenies by maximum likelihood. Syst Biol 52:696–704
Hasegawa M, Kishino H, Yano T (1985) Dating of the human–ape splitting by a molecular clock of mitochondrial DNA. J Mol Evol 22:160–174
Karlson RH (1982) Reproductive patterns in Zoanthus spp. from Discovery Bay, Jamaica. In: Proceedings of the 4th international coral reef symposium, Manila, vol 2, pp 699–704
LaJeunesse TC (2002) Diversity and community structure of symbiotic dinoflagellates from Caribbean coral reefs. Mar Biol 141:387–400
LaJeunesse TC (2004) “Species” radiations of symbiotic dinoflagellates in the Atlantic and Indo-Pacific since the Miocene–Pliocene transition. Mol Biol Evol 22:570–581
Larson KS, Larson RJ (1982) On the ecology of Isaurus duchassaingi (Andres) (Cnidaria: Zoanthidea) from South Water Cay, Belize. In: Rutzler K, MacIntyre IG (eds) The Atlantic barrier ecosystems at Carrie Bow Cay, Belize, I: structure and communities. Smithsonian Contributions to the Marine Science 12, Washington, DC, pp 475–488
Muirhead A, Ryland JS (1985) A review of the genus Isaurus Gray 1828 (Zoanthidea), including new records from Fiji. J Nat His 19:323–335
Ono S, Reimer JD, Tsukahara J (2005) Reproduction of Zoanthus sansibaricus in the infra-littoral zone at Taisho Lava Field, Sakurajima, Kagoshima, Japan. Zool Sci 22:247–255
Pawlowski J, Holzmann M, Fahrni JF, Pochon X, Lee JJ (2001) Molecular identification of algal endosymbionts in large miliolid Foraminifera: 2. Dinoflagellates. J Eukaryot Microbiol 48:368–373
Pax F (1910) Studien an westindischen Actinien. Zool Jahrb Suppl 11:157–330
Pochon X, Pawlowski J Zaninetti L Rowan R (2001) High genetic diversity and relative specificity among Symbiodinium-like endosymbiotic dinoflagellates in sorotid foraminiferans. Mar Biol 139:1069–1078
Posada D, Crandall KA (1998) MODELTEST: testing the model of DNA substitution. Bioinformatics (Oxf) 14:817–818
Reimer JD (2007) Preliminary survey of zooxanthellate zoanthid diversity (Hexacorallia: Zoantharia) from southern Shikoku, Japan. Kuroshio Biosphere 3:1–16 + 7 pls
Reimer JD, Ono S, Takishita K, Fujiwara Y Tsukahara J (2004) Reconsidering Zoanthus spp. diversity: molecular evidence of conspecifity within four previously presumed species. Zool Sci 21:517–525
Reimer JD, Ono S, Iwama A, Tsukahara J, Maruyama T (2006a) High levels of morphological variation despite close genetic relatedness between Zoanthus aff. vietnamensis and Zoanthus kuroshio (Anthozoa: Hexacorallia). Zool Sci 23:755–761
Reimer JD, Ono S, Iwama A, Tsukahara J, Takishita K, Maruyama T (2006b) Morphological and molecular revision of Zoanthus (Anthozoa: Hexacorallia) from southwestern Japan with description of two new species. Zool Sci 23:261–275
Reimer JD, Ono S, Takishita K, Tsukahara J, Maruyama T (2006c) Molecular evidence suggesting species in the zoanthid genera Palythoa and Protopalythoa (Anthozoa: Hexacorallia) are congeneric. Zool Sci 23:87–94
Reimer JD, Takishita K, Maruyama T (2006d) Molecular identification of symbiotic dinoflagellates (Symbiodinium spp.) from Palythoa spp. (Anthozoa: Hexacorallia) in Japan. Coral Reefs 25:521–527
Reimer JD, Takishita K, Ono S, Maruyama T, Tsukahara J (2006e) Latitudinal and intracolony ITS-rDNA sequence variation in the symbiotic dinoflagellate genus Symbiodinium (Dinophyceae) in Zoanthus sansibaricus (Anthozoa: Hexacorallia). Phycol Res 54:122–132
Reimer JD, Ono S, Tsukahara J, Takishita K, Maruyama T (2007a) Non-seasonal clade-specificity and subclade microvariation in symbiotic dinoflagellates (Symbiodinium spp.) in Zoanthus sansibaricus (Anthozoa: Hexacorallia) at Kagoshima Bay, Japan. Phycol Res 55:58–65
Reimer JD, Takishita K, Ono S, Maruyama T (2007b) Diversity and evolution in the zoanthid genus Palythoa (Cnidaria: Hexacorallia) utilizing nuclear ITS-rDNA. Coral Reefs 26:399–410
Reimer JD, Takishita K, Ono S, Tsukahara J, Maruyama T (2007c) Molecular evidence suggesting intraspecific hybridization in Zoanthus (Anthozoa: Hexacorallia). Zool Sci 24:346–359
Rodriguez F, Oliver JL, Marin A, Medina JR (1990) The general stochiatic model of nucleotide substitution. J Theor Biol 142:485–501
Rodriguez-Lanetty M, Hoegh-Guldberg O (2003) Symbiont diversity within the scleractinian coral Plesiastrea versipora, across the northwestern Pacific. Mar Biol 143:501–509
Ronquist F, Huelsenbeck JP (2003) Bayesian phylogenetic inference under mixed models. Bioinformatics (Oxf) 19:1572–1574
Saitou N, Nei M (1987) The neighbor-joining method: a new method for reconstructing phylogenetic trees. Mol Biol Evol 4:406–425
Shearer TL, van Oppen MJH, Romano SL, Worheide G (2002) Slow mitochondrial DNA sequence evolution in the Anthozoa (Cnidaria). Mol Ecol 11:2475–2487
Sinniger F, Montoya-Burgess JI, Chevaldonne P, Pawlowski J (2005) Phylogeny of the order Zoantharia (Anthozoa, Hexacorallia) based on mitochondrial ribosomal genes. Mar Biol 147:1121–1128
Swofford DL (1998) PAUP*. V Phylogenetic analysis using parsimony (*and other methods), version 4. Sinauer Associates, Sunderland, MA, USA
Tamura K, Nei M (1993) Estimation of the number of nucleotide substitutions in the control region of mitochondrial DNA in humans and chimpanzees. Mol Biol Evol 10:512–526
Thompson JD, Gibson TJ, Plewniak F, Jeanmougin F, Higgins DG (1997) The ClustalX windows interface: flexible strategies for multiple sequence alignment aided by quality analysis tools. Nucleic Acids Res 25:4876–4882
Uchida H (2001) Sea anemones in Japanese Waters. TBS Britannica, Tokyo (in Japanese). pp 118–124
Acknowledgments
JDR would like to thank Koki Tanaka (BIK), Mai Miyamoto and Miho Watanabe (both Tokyo University of Marine Science and Technology), Dr. Kensuke Yanagi (Coastal Branch of Natural History Museum and Institute, Chiba), Hiroko Haraguchi (Kochi University), Yuichi Nagata and Mika Reimer for assistance in sampling. As well, Kazutoshi Nishimoto and Atsushi Nishimoto (both Tatsukushi Port) helped with guidance during zoanthid surveys. Dr. Jane Fromont and Dr. Mark Salotti (WAM) kindly loaned Z. praelongus and Isaurus samples, with an introduction from Max Rees (Australian Institute of Marine Science). Australian samples were collected by WAM as part of a SRFME funded project on the Central West Coast of Australia. Additionally, Dr. Hiroomi Uchida (Kushimoto Marine Park, Wakayama) and Frederic Sinniger (University of Geneva) kindly loaned us other samples or information utilized in this study. At JAMSTEC, Masaru Kawato and Hirokazu Kuwahara helped with sequencing. Dr. Kiyotaka Takishita (JAMSTEC) and comments from three anonymous reviewers greatly improved the manuscript. All experiments described within comply with the current laws of Japan.
Author information
Authors and Affiliations
Corresponding author
Additional information
Communicated by S. Nishida.
Electronic supplementary material
Below is the link to the electronic supplementary material.
Rights and permissions
About this article
Cite this article
Reimer, J.D., Ono, S., Tsukahara, J. et al. Molecular characterization of the zoanthid genus Isaurus (Anthozoa: Hexacorallia) and associated zooxanthellae (Symbiodinium spp.) from Japan. Mar Biol 153, 351–363 (2008). https://doi.org/10.1007/s00227-007-0811-0
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00227-007-0811-0