Flexible associations between Pocillopora corals and Symbiodinium limit utility of symbiosis ecology in defining species

R. Cunning, P. W. Glynn, Andrew C Baker

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Corals in the genus Pocillopora are the primary framework builders of eastern tropical Pacific (ETP) reefs. These corals typically associate with algal symbionts (genus Symbiodinium) in clade C and/or D, with clade D associations having greater thermal tolerance and resistance to bleaching. Recently, cryptic "species" delineations within both Pocillopora and Symbiodinium have been suggested, with host-symbiont specificity used as a supporting taxonomic character in both genera. In particular, it has been suggested that three lineages of Pocillopora (types 1-3) exist in the ETP, of which type 1 is the exclusive host of heat-tolerant Symbiodinium D1. This host specificity has been used to support the species name "Symbiodinium glynni" for this symbiont. To validate these host-symbiont relationships and their taxonomic utility, we identified Pocillopora types and their associated Symbiodinium at three sites in the ETP. We found greater flexibility in host-symbiont combinations than previously reported, with both Pocillopora types 1 and 3 able to host and be dominated by Symbiodinium in clade C or D. The prevalence of certain combinations did vary among sites, showing that a gradient of specificity exists which may be mediated by evolutionary relationships and environmental disturbance history. However, these results limit the utility of apparent host-symbiont specificity (which may have been a result of undersampling) in defining species boundaries in either corals or Symbiodinium. They also suggest that a greater diversity of corals may benefit from the thermal tolerance of clade D symbionts, affirming the need to conserve Pocillopora across its entire geographic and environmental range.

Original languageEnglish
Pages (from-to)795-801
Number of pages7
JournalCoral Reefs
Volume32
Issue number3
DOIs
StatePublished - Sep 1 2013

Fingerprint

Symbiodinium
symbiont
symbiosis
symbionts
corals
coral
ecology
heat tolerance
tolerance
environmental disturbance
host specificity
bleaching
reefs
reef
heat
history

Keywords

  • Eastern Pacific
  • Pocillopora
  • Symbiodinium
  • Systematics

ASJC Scopus subject areas

  • Aquatic Science

Cite this

Flexible associations between Pocillopora corals and Symbiodinium limit utility of symbiosis ecology in defining species. / Cunning, R.; Glynn, P. W.; Baker, Andrew C.

In: Coral Reefs, Vol. 32, No. 3, 01.09.2013, p. 795-801.

Research output: Contribution to journalArticle

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