Enhanced visual fields in hammerhead sharks

The Journal of Experimental Biology
D M McCombS M Kajiura

Abstract

Several factors that influence the evolution of the unusual head morphology of hammerhead sharks (family Sphyrnidae) are proposed but few are empirically tested. In this study we tested the 'enhanced binocular field' hypothesis (that proposes enhanced frontal binocularity) by comparison of the visual fields of three hammerhead species: the bonnethead shark, Sphyrna tiburo, the scalloped hammerhead shark, Sphyrna lewini, and the winghead shark, Eusphyra blochii, with that of two carcharhinid species: the lemon shark, Negaprion brevirostris, and the blacknose shark, Carcharhinus acronotus. Additionally, eye rotation and head yaw were quantified to determine if species compensate for large blind areas anterior to the head. The winghead shark possessed the largest anterior binocular overlap (48 deg.) and was nearly four times larger than that of the lemon (10 deg.) and blacknose (11 deg.) sharks. The binocular overlap in the scalloped hammerhead sharks (34 deg.) was greater than the bonnethead sharks (13 deg.) and carcharhinid species; however, the bonnethead shark did not differ from the carcharhinids. These results indicate that binocular overlap has increased with lateral head expansion in hammerhead sharks. The hammerhead speci...Continue Reading

References

Dec 1, 1971·Vision Research·K P Kuchnow
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Aug 1, 2000·Vision Research·G RehkämperA Görlach
Dec 15, 2005·Zoology : Analysis of Complex Systems, ZACS·Stephen M KajiuraAdam P Summers
Dec 16, 2005·The Journal of Experimental Biology·Tim Malmström, Ronald H H Kröger
Feb 5, 2008·The Journal of Experimental Biology·D Michelle McComb, Stephen M Kajiura

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Citations

Sep 19, 2012·Brain, Behavior and Evolution·Barbara E Wueringer
Jan 7, 2014·PloS One·Tomas Vega-ZunigaJorge Mpodozis
Jan 30, 2010·Physiological and Biochemical Zoology : PBZ·D Michelle McCombStephen M Kajiura
May 1, 2013·Physiological and Biochemical Zoology : PBZ·D Michelle McCombTamara M Frank
Feb 9, 2010·Molecular Phylogenetics and Evolution·Douglas D LimAndrew P Martin
Apr 14, 2012·Journal of Fish Biology·T J LisneyN S Hart
Apr 23, 2015·Integrative and Comparative Biology·Stefano MarrasPaolo Domenici
Jun 13, 2014·Integrative Zoology·Nathan S Hart, Shaun P Collin
Feb 17, 2015·Journal of Morphology·Kyle R MaraRobert E Hueter
Jul 22, 2014·Zoology : Analysis of Complex Systems, ZACS·Scott SeamoneTimothy E Higham
Aug 21, 2015·PeerJ·Diana PitaEsteban Fernández-Juricic
Nov 16, 2014·Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology·Michael F Land
Nov 2, 2016·The Journal of Experimental Biology·Laura A RyanJan M Hemmi
Aug 2, 2018·Clinical & Experimental Optometry : Journal of the Australian Optometrical Association·Shaun P Collin
Oct 13, 2018·The Anatomical Record : Advances in Integrative Anatomy and Evolutionary Biology·Matthew Gurley, Philip Motta
Nov 30, 2019·The Journal of Experimental Biology·Valerio TettamantiFabio Cortesi
Aug 17, 2020·The Journal of Experimental Biology·F DhellemmesJ Krause
Jul 8, 2021·Proceedings. Biological Sciences·Karissa O LearAdrian C Gleiss
Apr 26, 2020·Seminars in Cell & Developmental Biology·Nathan S Hart

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