Expression of squid iridescence depends on environmental luminance and peripheral ganglion control
Gonzalez-Bellido, Paloma T.
Wardill, Trevor J.
Buresch, Kendra C.
Ulmer, Kevin M.
Hanlon, Roger T.
MetadataShow full item record
KeywordStructural coloration; Neural control; Visual; Behaviour; Extracellular stimulation; Iridophore
Squids display impressive changes in body coloration that are afforded by two types of dynamic skin elements: structural iridophores (which produce iridescence) and pigmented chromatophores. Both color elements are neurally controlled, but nothing is known about the iridescence circuit, or the environmental cues, that elicit iridescence expression. To tackle this knowledge gap, we performed denervation, electrical stimulation and behavioral experiments using the long-fin squid, Doryteuthis pealeii. We show that while the pigmentary and iridescence circuits originate in the brain, they are wired differently in the periphery: (i) the iridescence signals are routed through a peripheral center called the stellate ganglion and (ii) the iridescence motorneurons likely originate within this ganglion (as revealed by nerve fluorescence dye fills). Cutting the inputs to the stellate ganglion that descend from the brain shifts highly reflective iridophores into a transparent state. Taken together, these findings suggest that although brain commands are necessary for expression of iridescence, integration with peripheral information in the stellate ganglion could modulate the final output. We also demonstrate that squids change their iridescence brightness in response to environmental luminance; such changes are robust but slow (minutes to hours). The squid's ability to alter its iridescence levels may improve camouflage under different lighting intensities.
Author Posting. © The Author(s), 2013. This is the author's version of the work. It is posted here by permission of Company of Biologists for personal use, not for redistribution. The definitive version was published in Journal of Experimental Biology 217 (2014):850-858, doi:10.1242/jeb.091884.
Suggested CitationPreprint: Gonzalez-Bellido, Paloma T., Wardill, Trevor J., Buresch, Kendra C., Ulmer, Kevin M., Hanlon, Roger T., "Expression of squid iridescence depends on environmental luminance and peripheral ganglion control", 2013-10, https://doi.org/10.1242/jeb.091884, https://hdl.handle.net/1912/6621
Showing items related by title, author, creator and subject.
Results of manipulative field study and controlled lab experiment on growth rates of juvenile lionfish on reefs with controlled abundances of Nassau grouper; Bahamas, 2010 (Lionfish Invasion project) Hixon, Mark; Pusack, Timothy J (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: email@example.com, 2019-11-06)Results of manipulative field study and controlled lab experiment on growth rates of juvenile lionfish on reefs with controlled abundances of Nassau grouper; Bahamas, 2010. For a complete list of measurements, refer to ...
Girton, James B.; Pratt, Lawrence J.; Sutherland, David A.; Price, James F. (American Meteorological Society, 2006-12)The overflow of dense water from the Nordic Seas through the Faroe Bank Channel (FBC) has attributes suggesting hydraulic control—primarily an asymmetry across the sill reminiscent of flow over a dam. However, this aspect ...
Schempf, Hagen (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1990-08)Transmission dynamics are shown to dominate the stability and performance of impedance- and torque controlled rotary electro-mechanical systems. The experimental analysis focuses on planetary, cycloidal, harmonic and ...