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Article
Temporal Resolution and Spectral Sensitivity of the Visual System of Three Coastal Shark Species from Different Light Environments
Physiological and Biochemical Zoology
  • D. Michelle McComb, Florida Atlantic University
  • Tamara M. Frank, Florida Atlantic University
  • Robert E. Hueter, Mote Marine Laboratory
  • Stephen M. Kajiura, Florida Atlantic University
Document Type
Article
Publication Date
3-1-2010
Peer Reviewed
1
Abstract

Visual temporal resolution and scotopic spectral sensitivity of three coastal shark species (bonnethead Sphyrna tiburo, scalloped hammerhead Sphyrna lewini, and blacknose shark Carcharhinus acronotus) were investigated by electroretinogram. Temporal resolution was quantified under photopic and scotopic conditions using response waveform dynamics and maximum critical flicker‐fusion frequency (CFF). Photopic CFFmax was significantly higher than scotopic CFFmax in all species. The bonnethead had the shortest photoreceptor response latency time (23.5 ms) and the highest CFFmax (31 Hz), suggesting that its eyes are adapted for a bright photic environment. In contrast, the blacknose had the longest response latency time (34.8 ms) and lowest CFFmax (16 Hz), indicating its eyes are adapted for a dimmer environment or nocturnal lifestyle. Scotopic spectral sensitivity revealed maximum peaks (480 nm) in the bonnethead and blacknose sharks that correlated with environmental spectra measured during twilight, which is a biologically relevant period of heightened predation.

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©2010 by The University of Chicago

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Additional Comments
NSF grant #: IOS-0639949
DOI
10.1086/648394
Citation Information
D. Michelle McComb, Tamara M. Frank, Robert E. Hueter and Stephen M. Kajiura. "Temporal Resolution and Spectral Sensitivity of the Visual System of Three Coastal Shark Species from Different Light Environments" Physiological and Biochemical Zoology Vol. 83 Iss. 2 (2010) p. 299 - 307 ISSN: 1522-2152
Available at: http://works.bepress.com/tamara-frank/40/