Axial morphology and 3D neurocranial kinematics in suction-feeding fishes

Biology Open
Yordano E JimenezElizabeth L Brainerd

Abstract

Many suction-feeding fish use neurocranial elevation to expand the buccal cavity for suction feeding, a motion necessarily accompanied by the dorsal flexion of joints in the axial skeleton. How much dorsal flexion the axial skeleton accommodates and where that dorsal flexion occurs may vary with axial skeletal morphology, body shape and the kinematics of neurocranial elevation. We measured three-dimensional neurocranial kinematics in three species with distinct body forms: laterally compressed Embiotoca lateralis, fusiform Micropterus salmoides, and dorsoventrally compressed Leptocottus armatus The area just caudal to the neurocranium occupied by bone was 42±1.5%, 36±1.8% and 22±5.5% (mean±s.e.m.; N=3, 6, 4) in the three species, respectively, and the epaxial depth also decreased from E. lateralis to L. armatus Maximum neurocranial elevation for each species was 11, 24 and 37°, respectively, consistent with a hypothesis that aspects of axial morphology and body shape may constrain neurocranial elevation. Mean axis of rotation position for neurocranial elevation in E. lateralis, M. salmoides and L. armatus was near the first, third and fifth intervertebral joints, respectively, leading to the hypothesis of a similar relationship...Continue Reading

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Citations

Mar 9, 2019·Integrative and Comparative Biology·Ariel L Camp
Jan 23, 2020·Proceedings. Biological Sciences·Yordano E Jimenez, Elizabeth L Brainerd
Aug 26, 2021·Proceedings. Biological Sciences·Ariel L Camp
Oct 30, 2021·The Journal of Experimental Biology·Yordano E Jimenez, Elizabeth L Brainerd

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