Coral Reefs

, Volume 24, Issue 2, pp 343–347

An ITS region phylogeny of Siderastrea (Cnidaria: Anthozoa): is S. glynni endangered or introduced?

  • Z. H. Forsman
  • H. M. Guzman
  • C. A. Chen
  • G. E. Fox
  • G. M. Wellington
Report

Abstract

The genus Siderastrea contains only five extant species, including Siderastrea glynni, which is one of the few recognized species of endangered stony coral. Cloned sequences of the internal transcribed spacer (ITS) region had low levels of intragenomic nucleotide diversity, and few alignment ambiguities, which allowed for the first species-level phylogenetic analysis of the genus. Results indicated an unexpected deep divergence between the Western-Pacific and Atlantic species. ITS region sequences indicated that S. glynni is not derived from S. savignyana, as previously thought. Instead, S. glynni shared identical sequence types with S. siderea in the Caribbean. Given a range of previously published evolutionary rates for the ITS region, it is unlikely that S. glynni represents the remnants of a population that was divided by the closure of the Central American Seaway (approximately 3–3.8 MYA). It is more likely that S. glynni originated by a breach of the Isthmus (approximately 2 MYA), or a contemporary introduction by ship.

Keywords

Siderastrea glynni ITS region Endangered coral Coral species phylogeny Panamá Canal Introduced species 

Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • Z. H. Forsman
    • 1
  • H. M. Guzman
    • 2
  • C. A. Chen
    • 3
  • G. E. Fox
    • 4
  • G. M. Wellington
    • 4
  1. 1.Department of BiologyUniversity of HawaiiHonoluluUSA
  2. 2.Smithsonian Tropical Research InstituteBalboaPanama
  3. 3.Research Centre for BiodiversityAcademia SinicaNangang, TaipaiTaiwan
  4. 4.Department of Biology and BiochemistryUniversity of HoustonHoustonUSA

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