Self-recruitment in a coral reef fish population

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Abstract

The question of how far the larvae of marine organisms disperse is fundamental to an understanding of their population dynamics1,2,3, the management of exploited species4,5 and the conservation of marine biodiversity6,7. It is generally assumed that larvae disperse away from their natal population so that local populations operate as ‘open’ systems, driven by recruitment of larvae from other sub-populations8. However, this assumption has never been critically tested. Here we show for the first time that juveniles from a coral reef fish population can return to their natal reef. We marked otoliths (ear bones) of over 10 million developing embryos of the damselfish, Pomacentrus amboinensis, at Lizard Island (Great Barrier Reef). Subsequently, from an examination of 5,000 juveniles settling at the same location, we found 15 marked individuals. On the basis of an estimate of the proportion of embryos marked (0.5–2%), as many as 15–60% of juveniles may be returning to their natal population (self-recruitment). We challenge the assumption that long-distance dispersal is the norm for reef fish populations.

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Figure 1: Map of Lizard Island on the northern Great Barrier Reef, showing the location of the six 150-m stretches of reef edge where all embryos of Pomacentrus amboinensis were marked over a three-month period (October–December 1994).

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Acknowledgements

We thank I. Keay and B. Kerrigan for assistance in the field and laboratory, and M. McCormick and P. Munday for editorial comments. This work was supported by the Australian Research Council, Large Grant Scheme, James Cook University and the Australian Museum's Lizard Island Research Station.

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Correspondence to G. P. Jones.

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Jones, G., Milicich, M., Emslie, M. et al. Self-recruitment in a coral reef fish population. Nature 402, 802–804 (1999) doi:10.1038/45538

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