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Environmental Biology of Fishes

, Volume 83, Issue 4, pp 507–519 | Cite as

Functional significance of intramandibular bending in Poeciliid fishes

  • Alice GibbEmail author
  • Lara A. Ferry-Graham
  • L. Patricia Hernandez
  • Rebecca Romansco
  • Jessica Blanton
Article

Abstract

Substrate-feeding teleosts show multiple, independent evolutionary acquisitions of intramandibular bending (bending within the lower jaw)—a behavior that likely enhances performance when feeding on attached or encrusting food items. However, intramandibular bending has only been quantified for marine teleosts. Here, we examine substrate feeding in eight species from the order Cyprinodontiformes and quantify movements produced by the anterior jaws of four target species selected from the family Poeciliidae to represent a variety of trophic strategies. Intramandibular bending, defined here as bending between the dentary and angular–articular bones of the lower jaw, is not present in some poeciliids (i.e. Gambusia affinis), nor is it present in outgroup cyprinodontiforms (i.e. Fundulus rubrifrons). However, intramandibular bending is present in certain poeciliids (i.e. Poecilia sphenops), and can exceed 90°. Such jaw bending enables the production of a gape angle that approaches 120°, which likely allows the fish to maximize contact between the toothed tips of the jaws and the substrate during the bite. Intramandibular bending in poeciliid species is associated with specific trophic shifts: the greater the intramandibular bending in a given species, the more attached algae (periphyton) reported in its diet. This result supports the hypothesis that intramandibular bending enhances performance when feeding on encrusting food items. We predict that additional examples of functional convergence are likely to be documented in freshwater teleosts as more herbivorous species are examined, and we propose that intramandibular bending represents an excellent model system in which to examine the functional processes that underlie convergent evolution.

Keywords

Convergent evolution Algae scraping Substrate feeding Trophic evolution Herbivory Poeciliidae Cyprinodontiformes Oral jaws Grazing 

Notes

Acknowledgement

Support for this research was provided by a Northern Arizona University (NAU) Intramural Grant and a Science Foundational Arizona Competitive Advantage Award (CAA 0057-07) to ACG. Additional funding was provided through NSF DBI-0243914, “Research internships in neural and behavioral sciences,” to S. Shuster and V. Blankenship of NAU; this NSF grant supplied summer stipends and funds for laboratory supplies for JB and RR, who conducted the majority of the feeding behavior trials reported in this study. Jenny Eckels collected additional behavioral data for the outgroup species included here. Matt O’Neill, Cinnamon Pace, Teresa Hunt, Anthony Arena and Brandon Melville provided technical support and helpful comments on early versions of the manuscript. We also thank Peter Wainwright, an anonymous reviewer, and the editors at Environmental Biology of Fishes for their thoughtful comments.

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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  • Alice Gibb
    • 1
    Email author
  • Lara A. Ferry-Graham
    • 2
  • L. Patricia Hernandez
    • 3
  • Rebecca Romansco
    • 1
  • Jessica Blanton
    • 1
  1. 1.Department of Biological SciencesNorthern Arizona UniversityFlagstaffUSA
  2. 2.Moss Landing Marine LaboratoriesCalifornia State UniversityMoss LandingUSA
  3. 3.Department of Biological SciencesThe George Washington UniversityWashingtonUSA

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