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Coral Reefs

, Volume 30, Issue 1, pp 195–201 | Cite as

Spatial variation in porosity and skeletal element characteristics in apical tips of the branching coral Acropora pulchra (Brook 1891)

  • R. C. Roche
  • R. L. Abel
  • K. G. Johnson
  • C. T. Perry
Note

Abstract

Micro-CT scanning techniques were used to investigate fine-scale variation in porosity along branch tips of Acropora pulchra. Porosity variation is a result of progressive thickening of skeletal elements away from the apical tip of branches, rather than changes in the spacing of skeletal elements. A linear fit was found to describe the relationship between distance along the tip and both porosity and skeletal thickness. The slope of the line obtained may relate to branch extension rates and allow retrospective data to be obtained from Acropora specimens. Skeletal morphology examined by 2D and 3D imaging shows a progressive gradation in thickness occurring in the axial corallite wall and thickness changes at a site of incipient branch formation. The application of the micro-CT technique to museum and fossil specimens is illustrated.

Keywords

Acropora Porosity CT scan Skeletal structure 

Notes

Acknowledgments

Support for this research was provided by a UK Natural Environmental Research Council Grant NE/F01077X/1 to CTP and KGJ. Acropora pulchra specimens were collected under GBRMPA research permit number G08/27113.1.

Supplementary material

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References

  1. Barnes DJ, Devereux MJ (1988) Variations in skeletal architecture associated with density banding in the hard coral Porites. J Exp Mar Biol Ecol 121:37–54CrossRefGoogle Scholar
  2. Beuck L, Vertino A, Stepina E, Karolczak M, Pfannkuche O (2007) Skeletal response of Lophelia pertusa (Scleractinia) to bioeroding sponge infestation visualised with micro-computed tomography. Facies 53:157–176CrossRefGoogle Scholar
  3. Bottjer DJ (1980) Branching morphology of the reef coral Acropora cervicornis in different hydraulic regimes. J Paleontol 54:1102–1107Google Scholar
  4. Bucher DJ, Harriott VJ, Roberts LG (1998) Skeletal micro-density, porosity and bulk density of acroporid corals. J Exp Mar Biol Ecol 228:117–136CrossRefGoogle Scholar
  5. Carricart-Ganivet JP, Lough JM, Barnes DJ (2007) Growth and luminescence characteristics in skeletons of massive Porites from a depth gradient in the central Great Barrier Reef. J Exp Mar Biol Ecol 351:27–36CrossRefGoogle Scholar
  6. Chalker BE, Barnes DJ (1990) Gamma densitometry for the measurement of skeletal density Coral Reefs 9:11–23Google Scholar
  7. Cleveland RO, Cohen AL, Roy RA, Singh H, Szabo TL (2004) Imaging coral II: using ultrasound to image coral skeleton. Subsurf Sens Technol Appl 5:43–69CrossRefGoogle Scholar
  8. Dodge RE, Vaisnys JR (1975) Hermatypic coral growth banding as environmental recorder. Nature 258:706–708CrossRefGoogle Scholar
  9. Gladfelter EH (1982) Skeletal development in Acorpora cervicornis. Patterns of calcium carbonate accretion in the axial corallite. Coral Reefs 1:45–51CrossRefGoogle Scholar
  10. Gladfelter EH (2007) Skeletal development in Acropora palmata (Lamarck 1816): a scanning electron microscope (SEM) comparison demonstrating similar mechanisms of skeletal extension in axial versus encrusting growth. Coral Reefs 26:883–892CrossRefGoogle Scholar
  11. Kaniewska P, Campbell PR, Fine M, Hoegh-Guldberg O (2009) Phototrophic growth in a reef flat acroporid branching species. J Exp Biol 212:662–667CrossRefPubMedGoogle Scholar
  12. Laine J, Labady M, Albornoz A, Yunes S (2008) Porosities and pore sizes in coralline calcium carbonate. Mater Charact 59:1522–1525CrossRefGoogle Scholar
  13. Le Tissier MD, Clayton B, Brown BE, Davies PS (1994) Skeletal correlates of density banding and an evaluation of radiography as used in sclerochronology. Mar Ecol Prog Ser 110:29–44CrossRefGoogle Scholar
  14. McColl DJ, Abel RL, Spears IR, Macho GA (2006) Automated method to measure trabecular thickness from micro-computed tomographic scans and its application. Anat Rec A Discov Mol Cell Evol Biol 288:982–988PubMedGoogle Scholar
  15. Oliver JK (1984) Intra-colony variation in the growth of Acropora formosa: Extension rates and skeletal structure of white (zooxanthellae-free) and brown-tipped Branches. Coral Reefs 3:139–147CrossRefGoogle Scholar
  16. Saenger C, Cohen AL, Oppo DW, Halley RB, Carilli JE (2008) Surface-temperature trends and variability in the low-latitude North Atlantic since 1552. Nature Geoscience. doi: 101038/NGEO552
  17. Schönberg CHL (2001) Estimating the extent of endolithic tissue of a great barrier reef clionid sponge. Marine Biodiversity 31:29–39Google Scholar
  18. Shirai K, Kawashima T, Sowa K, Watanabe T, Nakamori T, Takahata N, Amakawa H, Sano Y (2008) Minor and trace element incorporation into branching coral Acropora nobilis skeleton. Geochim Cosmochim Acta 72:5386–5400CrossRefGoogle Scholar
  19. Wallace CC, Willis BL (1994) Systematics of the coral genus Acropora: implications of new biological findings for species concepts. Annu Rev Ecol Syst 25:237–262Google Scholar
  20. Wellington GM, Glynn PW (1983) Environmental influences on skeletal banding in eastern Pacific (Panama) corals. Coral Reefs 1:215–222CrossRefGoogle Scholar

Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • R. C. Roche
    • 1
    • 3
  • R. L. Abel
    • 2
  • K. G. Johnson
    • 3
  • C. T. Perry
    • 1
  1. 1.Department of Environmental and Geographical SciencesManchester Metropolitan UniversityManchesterUK
  2. 2.Department of MineralogyNatural History MuseumLondonUK
  3. 3.Department of PalaeontologyNatural History MuseumLondonUK

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