Suction feeding of West African lungfish (Protopterus annectens): An XROMM analysis of jaw mechanics, cranial kinesis, and hyoid mobility.

Autor:	Gartner SM; Department of Organismal Biology and Anatomy, University of Chicago, 1027 East 57th St., Chicago, IL 60637, USA., Whitlow KR; Department of Organismal Biology and Anatomy, University of Chicago, 1027 East 57th St., Chicago, IL 60637, USA., Laurence-Chasen JD; Department of Organismal Biology and Anatomy, University of Chicago, 1027 East 57th St., Chicago, IL 60637, USA., Kaczmarek EB; Department of Ecology, Evolution, and Organismal Biology, Brown University, 80 Waterman St., Providence RI 02912, USA., Granatosky MC; Department of Anatomy, New York Institute of Technology College of Osteopathic Medicine, 100 Northern Blvd, Old Westbury, NY 11568, USA., Ross CF; Department of Organismal Biology and Anatomy, University of Chicago, 1027 East 57th St., Chicago, IL 60637, USA., Westneat MW; Department of Organismal Biology and Anatomy, University of Chicago, 1027 East 57th St., Chicago, IL 60637, USA.
Jazyk:	angličtina
Zdroj:	Biology open [Biol Open] 2022 Sep 15; Vol. 11 (9). Date of Electronic Publication: 2022 Sep 12.
DOI:	10.1242/bio.059447
Abstrakt:	Suction feeding in fishes is characterized by rapid cranial movements, but extant lungfishes (Sarcopterygii: Dipnoi) exhibit a reduced number and mobility of cranial bones relative to actinopterygian fishes. Despite fusion of cranial elements, lungfishes are proficient at suction feeding, though the impacts of novel cranial morphology and reduced cranial kinesis on feeding remain poorly understood. We used X-ray reconstruction of moving morphology (XROMM) to study the kinematics of seven mobile elements (neurocranium, upper jaw, lower jaw, tongue, ceratohyal, clavicle, and cranial rib) and two muscles (costoclavicular portion of the hypaxialis and rectus cervicis) during the feeding strikes of West African lungfish (Protopterus annectens). We found that feeding by P. annectens on non-evasive prey is relatively slow, with a mean time to peak gape of 273 ms. Lower jaw depression and clavicular rotation were hinge-like, with one degree of freedom, but the ceratohyals rotated in a complex motion involving depression and long-axis rotation. We quantified the relative contributions to oral cavity volume change (RCVC) and found that oral cavity expansion is created primarily by ceratohyal and clavicle motion. P. annectens suction feeds relatively slowly but successfully through muscle shortening of hypaxial and rectus cervicis muscles contributing to hyoid mobility. Competing Interests: Competing interests The authors declare no competing or financial interests. (© 2022. Published by The Company of Biologists Ltd.)
Databáze:	MEDLINE
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