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Patterns of recruitment and abundance of corals along the Great Barrier Reef

Abstract

Different physical and biological processes prevail at different scales1,2,3,4. As a consequence, small-scale experiments or local observations provide limited insights into regional or global phenomena5,6,7,8. One solution is to incorporate spatial scale explicitly into the experimental and sampling design of field studies, to provide a broader, landscape view of ecology1,2,3,4,5,6,7,8. Here we examine spatial patterns in corals on the Great Barrier Reef, across a spectrum of scales ranging from metres to more than 1,700 km. Our study is unusual because we explore large-scale patterns of a process (recruitment by juveniles) as well as patterns of adult abundance, revealing the relationship between the two. We show that coral-reef assemblages that are similar in terms of abundance may nonetheless show profound differences in dynamics and turnover, with major implications for their ecology, evolution and management.

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Figure 1: Map of the GBR, indicating the location of 33 reefs at which recruitment and abundance of corals were measured.
Figure 2: A hierarchical sampling design used to measure spatial variation in the recruitment and abundance of corals in sectors along the GBR, each 250–500 km apart.
Figure 3: Amounts of recruitment (number per panel) and adult abundance (number of colonies per 10-m transect) of spawning and brooding corals on reef crests in six sectors of the GBR (numbered 1–6 from north to south, see Fig. 1).
Figure 4: Components of variation at four spatial scales.
Figure 5: The correlation between recruitment of spawners and brooders (both log(x + 1)-transformed), plotted here at the scale of individual panels (n = 1,135 panels for two years combined; r = 0.27, P < 0.001 ).

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Acknowledgements

We thank the 41 graduate-student volunteers from James Cook University (JCU) who provided field assistance, and D. Ayre, J. Caley, P. Doherty and L. Smith for comments on the manuscript. Research was funded by grants to T.P.H. from the Australian Research Council. This is contribution no. 162 of the Coral Group at JCU.

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Hughes, T., Baird, A., Dinsdale, E. et al. Patterns of recruitment and abundance of corals along the Great Barrier Reef. Nature 397, 59–63 (1999). https://doi.org/10.1038/16237

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