Abstract
Patterns of distribution and abundance of coral reef fish depend in part on recruitment of a pelagic larval stage, on subsequent dispersal among habitats, and survival of new recruits. We studied recruitment of five species of Stegastes and two species of Chromis damselfish onto reef habitats of St. Thomas, USVI during one year. The two study sites, Flat Cay and Outer Brass Island, were on the southern and northern sides of St. Thomas, respectively. At both sites, recruitment occurred largely in the summer months, although one species (Stegastes planifrons) showed significant winter recruitment at Flat Cay. The onset of increased summer recruitment in 1992 of other species occurred several weeks later and was shorter in duration at Outer Brass Island than at Flat Cay, perhaps indicating differences in oceanographic conditions (currents etc.) or spawning cycles between sites. The two Chromis species showed lunar periodicity of settlement at Flat Cay. At Flat Cay, recruits of three species (S. leucostictus, S. diencaeus and S. planifrons) were associated with conspecifics possibly due to preferential settlement. Similarly, new recruits were more often found near live coral than coral rubble, and very few occurred on sand habitat. Substratum complexity was a poor predictor of recruitment within a habitat, although larger juveniles of some species were more common on more complex substrate. Contrary to other studies, there were no apparent depth preferences among recruits, although larger juveniles of two Stegastes species were found more often in deeper water. It appears that within habitats, newly arriving larvae may be attracted first to the presence of conspecifics and secondarily take up position adjacent to live coral. Apparent survivorship of some Stegastes species and one Chromis species was higher at Outer Brass Island than at Flat Cay, and may partly compensate for lower recruitment of some species at Outer Brass Island.
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Booth, D.J., Beretta, G.A. Seasonal recruitment, habitat associations and survival of pomacentrid reef fish in the US Virgin Islands. Coral Reefs 13, 81–89 (1994). https://doi.org/10.1007/BF00300765
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DOI: https://doi.org/10.1007/BF00300765