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Intralocality Variation in Feeding Biomechanics and Prey Use in Archosargus probatocephalus (Teleostei, Sparidae), with Implications for the Ecomorphology of Fishes

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Abstract

Archosargus probatocephalusin a Florida estuary was investigated to explore intraspecific variation in prey utilization and jaw biomechanics. Volumetric contribution of major prey types and seven biomechanical features of the oral jaws that characterize prey-capture and processing performance were contrasted between two locations within the estuary. At Mosquito Lagoon, where A. probatocephalusinhabited mostly oyster beds, mangroves and salt marshes, fish consumed mostly thick-shelled bivalves, gastropods, crabs, and tubiculous polychaetes and amphipods. In contrast, conspecifics at Indian River Lagoon that inhabited mostly seagrass beds and algal turf consumed predominantly algae, seagrass, epiphytic invertebrates and small bivalves and gastropods. Difference in magnitude of durophagy between locations was associated with differences in oral-jaw biomechanics. Analyses of covariance indicated that A. probatocephalusat Mosquito Lagoon had more massive jaw muscles and bones, than conspecifics at Indian River Lagoon. Variations in lever ratios for jaw-opening and jaw-closing between locations were not significant. It is hypothesized that intralocality differences in food habits have induced the development of feeding morphologies that enhance the ability of A. probatocephalusto successfully exploit locally dominant prey resources within the estuary. Plasticity of the feeding mechanism of A. probatocephalusmay buffer the species from the adverse effects of settling on heterogeneous habitats that contain variable prey resources such as those found within estuaries.

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Authors and Affiliations

  1. Department of Biological Sciences, Florida Institute of Technology, 150 West University Boulevard, Melbourne, FL, 32901, U.S.A.

    Michele M. Cutwa

  2. Department of Biological Sciences, Florida Institute of Technology, 150 West University Boulevard, Melbourne, FL, 32901, U.S.A.

    Ralph G. Turingan

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  1. Michele M. Cutwa
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  2. Ralph G. Turingan
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Cutwa, M.M., Turingan, R.G. Intralocality Variation in Feeding Biomechanics and Prey Use in Archosargus probatocephalus (Teleostei, Sparidae), with Implications for the Ecomorphology of Fishes. Environmental Biology of Fishes 59, 191–198 (2000). https://doi.org/10.1023/A:1007679428331

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