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Gut length and mass in herbivorous and carnivorous prickleback fishes (Teleostei: Stichaeidae): ontogenetic, dietary, and phylogenetic effects

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Abstract

Relative gut length, Zihler’s index, and relative gut mass were measured in four species of prickleback fishes and the effects of ontogeny, diet, and phylogeny on these gut dimensions were determined. Of the four species, Cebidichthys violaceus and Xiphister mucosus shift to herbivory with growth (>45 mm SL), whereas X. atropurpureus and Anoplarchus purpurescens remain carnivores. A. purpurescens belongs to a carnivorous clade, and the three other species belong to an adjacent, herbivorous clade. Gut dimensions were compared in three feeding categories of the four species: (1) small, wild-caught juveniles representing the carnivorous condition before two species shift to herbivory; (2) larger, wild-caught juveniles representing the natural diet condition of the two carnivores and the two species that have shifted to herbivory; and (3) larger, laboratory-raised juveniles produced by feeding a high-protein artificial diet to small juveniles until they have reached the size of the larger, wild-caught juveniles. Comparisons of gut dimensions in categories (1) versus (2) tested for an ontogenetic effect, in (2) versus (3) for a dietary effect, and within each category for a phylogenetic effect. C. violaceus and X. mucosus increased gut dimensions with increase in body size and did not change ontogenetic trajectory in gut dimensions on the high-protein artificial diet, suggesting that they are genetically programmed to develop relatively large guts associated with herbivory. X. atropurpureus increased its gut dimensions with increase in size similar to its sister taxon, X. mucosus, suggesting a phylogenetic influence, but decreased gut dimensions on the high-protein artificial diet, suggesting phenotypic plasticity. Nevertheless, X. atropurpureus displayed a larger gut than A. purpurescens, further evidence that it evolved in an herbivorous clade. A. purpurescens possessed a relatively small gut that was little affected by ontogeny or diet. Ontogeny and phylogeny more than diet appear to influence gut dimensions in the four species, thus favoring genetic adaptation over phenotypic plasticity as the major force acting on digestive system features in the two prickleback clades.

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Acknowledgements

We thank A. Gawlicka for help in the organizational phases of the study and in the field and laboratory, K. Boyle, M. Saba, K. Kim, E. Cox, and S. Choi for assistance in the field and laboratory, J. Carroll for providing access to Diablo Canyon and helping to collect X. mucosus , J. Degan for help in constructing the tank supports, K. Drewe for discussions on gut morphology, D. Smith for statistical insights and L. Crummett for moral support. Financial support was provided by a grant (OCE-9906857) from the National Science Foundation (M. H. Horn, principal investigator), a Sigma Xi Grant-in-Aid of Research and by the Departmental Associations Council and Department of Biological Science at California State University, Fullerton.

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  1. Department of Biological Science, California State University, Fullerton, CA, 92834-6850, USA

    Donovan P. German & Michael H. Horn

  2. Department of Zoology, University of Florida, Gainesville, FL, 32611-8525, USA

    Donovan P. German

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  1. Donovan P. German
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Correspondence to Donovan P. German.

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Communicated by P.W. Sammarco, Chauvin

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German, D.P., Horn, M.H. Gut length and mass in herbivorous and carnivorous prickleback fishes (Teleostei: Stichaeidae): ontogenetic, dietary, and phylogenetic effects. Marine Biology 148, 1123–1134 (2006). https://doi.org/10.1007/s00227-005-0149-4

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