Publications

Chan et al. 2009


scientific article | BMC Ecol | open access Open access

Generalist dinoflagellate endosymbionts and host genotype diversity detected from mesophotic (67-100 m depths) coral Leptoseris

Chan YL, Pochon X, Fisher MA, Wagner D, Concepcion GT, Kahng SE, Toonen RJ, Gates RD

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Abstract

BACKGROUND: Mesophotic corals (light-dependent corals in the deepest half of the photic zone at depths of 30 - 150 m) provide a unique opportunity to study the limits of the interactions between corals and endosymbiotic dinoflagellates in the genus Symbiodinium. We sampled Leptoseris spp. in Hawaii via manned submersibles across a depth range of 67 - 100 m. Both the host and Symbiodinium communities were genotyped, using a non-coding region of the mitochondrial ND5 intron (NAD5) and the nuclear ribosomal internal transcribed spacer region 2 (ITS2), respectively. RESULTS: Coral colonies harbored endosymbiotic communities dominated by previously identified shallow water Symbiodinium ITS2 types (C1_ AF333515, C1c_ AY239364, C27_ AY239379, and C1b_ AY239363) and exhibited genetic variability at mitochondrial NAD5. CONCLUSION: This is one of the first studies to examine genetic diversity in corals and their endosymbiotic dinoflagellates sampled at the limits of the depth and light gradients for hermatypic corals. The results reveal that these corals associate with generalist endosymbiont types commonly found in shallow water corals and implies that the composition of the Symbiodinium community (based on ITS2) alone is not responsible for the dominance and broad depth distribution of Leptoseris spp. The level of genetic diversity detected in the coral NAD5 suggests that there is undescribed taxonomic diversity in the genus Leptoseris from Hawaii.

Research sites

10.1186   1472 6785 9 21
Keywords
Meta-data (pending validation)
Depth range
67- 100 m

Mesophotic “mentions”
12 x (total of 3265 words)

Fields
Molecular ecology
Biodiversity

Focusgroups
Scleractinia (Hard Corals)
Symbiodinium (zooxanthellae)

Locations
USA - Hawaii

Platforms
Manned Submersible

Author profiles
Yvonne Chan ( 1 pubs)
Sam Kahng ( 14 pubs)
Xavier Pochon ( 4 pubs)
Rob Toonen ( 12 pubs)
Daniel Wagner ( 22 pubs)