Evol Ecol Res 7: 303-324 (2005) Full PDF if your library subscribes.
Trophic morphology, feeding performance and prey use in the polymorphic fish Herichthys minckleyi
C. Darrin Hulsey,1,2* Dean A. Hendrickson3 and Francisco J. García de León4
1Center for Population Biology and Department of Evolution and Ecology, University of California, Davis, CA, USA, 2Department of Ecology and Evolutionary Biology, University of Tennessee, Knoxville, TN, USA, 3Section of Integrative Biology, University of Texas, Austin, TX, USA and 4Laboratorio de Biología Integrativa, Instituto Tecnológico de Cuidad Victoria, Tamaulipas, Mexico
Address all correspondence to C. Darrin Hulsey, Ecology and Evolutionary Biology, University of Tennessee at Knoxville, 569 Dabney Hall, Knoxville, TN 37996, USA.
Question: How does pharyngeal jaw morphology influence feeding performance and prey use in the trophically polymorphic cichlid fish Herichthys minckleyi ?
Organism: Herichthys minckleyi exhibits two discrete pharyngeal jaw morphologies. Molariforms possess flattened teeth and enlarged pharyngeal muscles, whereas papilliforms exhibit more gracile jaws, pointed teeth and smaller muscles.
Data: We combined anatomy, experiments, diet analyses and a review of molluscivory to examine the relationships between morphology, feeding performance and prey use.
Conclusions: Handling time differed only slightly between morphotypes. Papilliforms shredded plants more finely than molariforms, and only molariforms readily crushed snails. Molariforms employed their maximum force-producing capabilities to crush snails in the wild. Comparisons with other molluscivorous fish suggested that the amount of hard-shelled prey molariform H. minckleyi ingest is not unusual, but its pharyngeal muscle mass and the force used to crush snails are extreme.
Keywords: body size, Cichlidae, co-evolution, Cuatro Ciénegas, Hydrobiidae, maximum performance.
DOWNLOAD A FREE, FULL PDF COPY
IF you are connected using the IP of a subscribing institution (library, laboratory, etc.)
or through its VPN.
© 2005 C. Darrin Hulsey. All EER articles are copyrighted by their authors. All authors endorse, permit and license Evolutionary Ecology Ltd. to grant its subscribing institutions/libraries the copying privileges specified below without additional consideration or payment to them or to Evolutionary Ecology, Ltd. These endorsements, in writing, are on file in the office of Evolutionary Ecology, Ltd. Consult authors for permission to use any portion of their work in derivative works, compilations or to distribute their work in any commercial manner.
Subscribing institutions/libraries may grant individuals the privilege of making a single copy of an EER article for non-commercial educational or non-commercial research purposes. Subscribing institutions/libraries may also use articles for non-commercial educational purposes by making any number of copies for course packs or course reserve collections. Subscribing institutions/libraries may also loan single copies of articles to non-commercial libraries for educational purposes.
All copies of abstracts and articles must preserve their copyright notice without modification.