Abstract
Most animals consume a narrower range of food resources than is potentially available in the environment, but the underlying basis for these preferences is often poorly understood. Foraging theory predicts that prey selection should represent a trade-off between prey preferences based on nutritional value and prey availability. That is, species should consume preferred prey when available, but select less preferred prey when preferred prey is rare. We employed both field observation and laboratory experiments to examine the relationship between prey selection and preferences in the obligate coral-feeding filefish, Oxymonacanthus longirostris. To determine the drivers of prey selection, we experimentally established prey preferences in choice arenas and tested the consequences of prey preferences for key fitness-related parameters. Field studies showed that individuals fed almost exclusively on live corals from the genus Acropora. While diet was dominated by the most abundant species, Acropora nobilis, fish appeared to preferentially select rarer acroporids, such as A. millepora and A. hyacinthus. Prey choice experiments confirmed strong preferences for these corals, suggesting that field consumption is constrained by availability. In a longer-term feeding experiment, reproductive pairs fed on non-preferred corals exhibited dramatic reductions to body weight, and in hepatic and gonad condition, compared with those fed preferred corals. The majority of pairs fed preferred corals spawned frequently, while no spawning was observed for any pairs fed a non-preferred species of coral. These experiments suggest that fish distinguish between available corals based on their intrinsic value as prey, that reproductive success is dependent on the presence of particular coral species, and that differential loss of preferred corals could have serious consequences for the population success of these dietary specialists.
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Acknowledgments
We wish to thank Reef HQ Aquarium, Orpheus Island Research Station, and Lizard Island Research Station. The Great Barrier Reef Marine Park Authority for financial support. M. McCormick, M. Mitchell, and members of the Jones and Munday laboratories for field assistance. The work described above corresponds to the laws and regulations of Australia under GBRMPA permit G10.33757.1 and animal ethics permit A1399.
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Communicated by Jeff Shima.
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Brooker, R.M., Jones, G.P. & Munday, P.L. Prey selectivity affects reproductive success of a corallivorous reef fish. Oecologia 172, 409–416 (2013). https://doi.org/10.1007/s00442-012-2521-7
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DOI: https://doi.org/10.1007/s00442-012-2521-7