Abstract
The behavior of marine larvae during and after settlement can help shape the distribution and abundance of benthic juveniles and therefore the intensity of ecological interactions on reefs. Several laboratory choice-chamber experiments were conducted to explore sensory capabilities and behavioral responses to ecological stimuli to better understand habitat selection by “pre-metamorphic” (larval) and “post-metamorphic” (juvenile) stages of a coral reef fish (Thalassoma hardwicke). T. hardwicke larvae were attracted to benthic macroalgae (Turbinaria ornata and Sargassum mangarevasae), while slightly older post-metamorphosed juveniles chose to occupy live coral colonies (Pocillopora damicornis). Habitat choices of larvae were primarily based upon visual cues and were not influenced by the presence of older conspecifics. In contrast, juveniles selected live coral colonies and preferred those occupied by older conspecifics; choices made by juveniles were based upon both visual and olfactory cues from conspecifics. Overall, the laboratory experiments suggest that early life-history stages of T. hardwicke use a range of sensory modalities that vary through ontogeny, to effectively detect and possibly discriminate among different microhabitats for settlement and later occupation. Habitat selection, based upon cues provided by environmental features and/or by conspecifics, might have important consequences for subsequent competitive interactions.
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Acknowledgments
This research was supported, in part, by the Centre de Recherches Insulaires et Observatoire de l’Environnement (CRIOBE—CRISP Program), and an NSF grant (OCE-0242312). We would like to thank Dr. Serge Planes, “Service de la Pêche” and Tropical Fish Tahiti for their help in using of crest nets. This work is a joint contribution from the CRIOBE and Gump Research Stations, both located on Moorea, and is contribution number 159 from UC Berkeley’s Richard B. Gump South Pacific Research Station, Moorea, French Polynesia.
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Lecchini, D., Osenberg, C.W., Shima, J.S. et al. Ontogenetic changes in habitat selection during settlement in a coral reef fish: ecological determinants and sensory mechanisms. Coral Reefs 26, 423–432 (2007). https://doi.org/10.1007/s00338-007-0212-3
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DOI: https://doi.org/10.1007/s00338-007-0212-3