Changes in scleractinian coral Seriatopora hystrix morphology and its endocellular Symbiodinium characteristics along a bathymetric gradient from shallow to mesophotic reef

Nir, O., Gruber, D. F., Einbinder, S., Kark, S. and Tchernov, D. (2011) Changes in scleractinian coral Seriatopora hystrix morphology and its endocellular Symbiodinium characteristics along a bathymetric gradient from shallow to mesophotic reef. Coral Reefs, 30 4: 1089-1100. doi:10.1007/s00338-011-0801-z


Author Nir, O.
Gruber, D. F.
Einbinder, S.
Kark, S.
Tchernov, D.
Title Changes in scleractinian coral Seriatopora hystrix morphology and its endocellular Symbiodinium characteristics along a bathymetric gradient from shallow to mesophotic reef
Journal name Coral Reefs   Check publisher's open access policy
ISSN 0722-4028
1432-0975
Publication date 2011-12
Year available 2011
Sub-type Article (original research)
DOI 10.1007/s00338-011-0801-z
Open Access Status
Volume 30
Issue 4
Start page 1089
End page 1100
Total pages 12
Place of publication Heidelberg, Germany
Publisher Springer
Collection year 2011
Language eng
Formatted abstract
The algae living endosymbiotically within coral are thought to increase algal pigmentation with increasing depth to capture the diminishing light. Here, we follow distribution of the hermatypic coral Seriatopora hystrix along a 60-m bathymetric gradient in the Gulf of Eilat, Red Sea, to study coral ecophysiology and response to light regimes. Combining work on coral morphology, pigment content and genotyping of the photosymbiont, we found that total chlorophyll concentration per zooxanthellae cell and the dark- and light-acclimated quantum yield of photosystem II did not vary significantly along the 60-m gradient. However, the chlorophyll a/c ratio increased with depth. This suggests that the symbiotic algae in S. hystrix possess a mechanism for acclimatization or adaptation that differs from previously described pathways. The accepted photoacclimatory process involves an increase in chlorophyll content per alga as light intensity decreases. Based on corallite and branch morphology, this research suggests that S. hystrix has two depth-dependent ecophenotypes. Above 10 m depth, S. hystrix exhibits sturdier colony configurations with thick branches, while below 30 m depth, colonies are characterized by thin branches and the presence of a larger polyp area. Between 10 and 30 m depth, both ecophenotypes are present, suggesting that corallite morphology may act as another axis of photoacclimation with depth.
Keyword Scleractinian coral
Deep reef
Morphology
Photosynthesis
Seriatopora hystrix
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Biological Sciences Publications
 
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