Publications

Lesser et al. 2010


scientific article | Ecology | open access Open access small aa108fa7f478951c693af64a05bc4b46e6711dbb69a20809512a129d4d6b870f

Photoacclimatization by the coral Montastraea cavernosa in the mesophotic zone: light, food, and genetics

Lesser MP, Slattery M, Stat M, Ojimi M, Gates RD, Grottoli A

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Abstract

Most studies on coral reefs have focused on shallow reef (< 30 m) systems due to the technical limitations of conducting scientific diving deeper than 30 m. Compared to their shallow-water counterparts, these mesophotic coral reefs (30-150 m) are understudied, which has slowed our broader understanding of the biodiversity, ecology, and connectivity of shallow and deep coral reef communities. We know that the light environment is an important component of the productivity, physiology, and ecology of corals, and it restricts the distribution of most species of coral to depths of 60 m or less. In the Bahamas, the coral Montastraea cavernosa has a wide depth distribution, and it is one of the most numerous corals at mesophotic depths. Using a range of optical, physiological, and biochemical approaches, the relative dependence on autotrophy vs. heterotrophy was assessed for this coral from 3 to 91 m. These measurements show that the quantum yield of PSII fluorescence increases significantly with depth for M. cavernosa while gross primary productivity decreases with depth. Both morphological and physiological photoacclimatization occurs to a depth of 91 m, and stable isotope data of the host tissues, symbionts, and skeleton reveal a marked decrease in productivity and a sharp transition to heterotrophy between 45 and 61 m. Below these depths, significant changes in the genetic composition of the zooxanthellae community, including genotypes not previously observed, occur and suggest that there is strong selection for zooxanthellae that are suited for survival in the light-limited environment where mesophotic M. cavernosa are occurring.

Research sites

10.1890   09 0313.1
Keywords
Meta-data (pending validation)
Depth range
3- 91 m

Mesophotic “mentions”
29 x (total of 7229 words)

Fields
Ecology Community structure Physiology Molecular ecology

Research focus
Scleractinia (Hard Corals) Symbiodinium (zooxanthellae)

Locations
Bahamas

Research platforms
Diving - Regular Open-Circuit Diving - Technical Open-Circuit Surface-deployed sensors and samplers
Author profiles
Michael P. Lesser ( 14 pubs)
Marc Slattery ( 11 pubs)