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Marine Biology

, Volume 155, Issue 6, pp 649–660 | Cite as

Variation in colony geometry modulates internal light levels in branching corals, Acropora humilis and Stylophora pistillata

  • Paulina Kaniewska
  • Kenneth R. N. Anthony
  • Ove Hoegh-Guldberg
Original Paper

Abstract

Colonial photosynthetic marine organisms often exhibit morphological phenotypic plasticity. Where such plasticity leads to an improved balance between rates of photosynthesis and maintenance costs, it is likely to have adaptive significance. To explore whether such phenotypic plasticity leads to more favourable within-colony irradiance for reef-building branching corals, this relationship was investigated for two coral species Acropora humilis and Stylophora pistillata, along a depth gradient representing light habitats ranging from 500 to 25 μmol photons m−2 s−1, during 2006 at Heron Island, Great Barrier Reef (23.44°S, 151.91°E). In the present study changes in flow-modulated mass transfer co-varied with light as a function of depth. In low-light (deep) habitats, branch spacing (colony openness) in A. humilis and S. pistillata was 40–50% greater than for conspecifics in high-light environments. Also, branches of A. humilis in deep water were 40–60% shorter than in shallow water. Phenotypic changes in these two variables lead to steeper within-colony light attenuation resulting in 38% higher mean internal irradiance (at the tissue surface) in deep colonies compared to shallow colonies. The pattern of branch spacing was similar for S. pistillata, but this species displayed an alternate strategy with respect to branch length: shade adapted deep and cave colonies developed longer and thinner branches, allowing access to higher mass transfer and irradiance. Corals in cave habitats allowed 20% more irradiance compared to colonies found in the deep, and had a 47% greater proportion of irradiance compared to colonies in the shallow high-light environment. Such phenotypic regulation of internal light levels on branch surfaces partly explains the broad light niches of many branching coral species.

Keywords

Coral Species Light Attenuation Coral Coloni Symbiotic Dinoflagellate Plaster Ball 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

This work was supported by funding from the Australian Research Council and University of Queensland. We thank P. Campbell, L, Franceschinis, N. Kongjandtre, A. Gallenne, M. Stock, A. Diaz-Ruiz and G. Holmes for assistance with fieldwork and two anonymous reviewers for comments on the manuscript. This is a contribution from the ARC Centre of Excellence for Coral Reef Studies.

Supplementary material

227_2008_1061_MOESM1_ESM.tif (671 kb)
Non-linear and linear regression summary for exponential and linear irradiance models for Acropora humilis and Stylophora pistillata irradiance profiles at Harry's Bommie (HB) and Tenements (T). Estimated coefficients are presented as means with the standard error of the mean given in parentheses (n=15), where I(d) is irradiance at position d along the branch, I(o) is the maximum irradiance at the tip of the branch and b is a coefficient indicating the steepness of the light attenuation. (TIFF 671 kb)

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Paulina Kaniewska
    • 1
  • Kenneth R. N. Anthony
    • 1
  • Ove Hoegh-Guldberg
    • 1
  1. 1.Centre for Marine Studies and ARC Centre of Excellence for Coral Reef StudiesThe University of QueenslandSt LuciaAustralia

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