An Ethogram of Body Patterning Behavior in the Biomedically and ...

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54 R. T. HANLON ET AL. Figure 2. Underwater video images of selected components and body patterns of I.&go pealei (A) The chronic Basic Amber Pattern. (B) The chronic Clear Body Pattern. (C) The chronic Bright White Pattern amidst other squids in Basic Amber. (D) The chronic All Dark pattern viewed against a sand substrate. (E) The Banded Bottom Sitting pattern showing disruptive coloration against a gravel substrate. (F) Acute Mate Guarding Pattern shown by a large consort male (female is just below him) showing the Splayed arm posture and the Accentuated testis chromatic component. (G) Raised arms postural component in a male that also shows the chromatic component of White arms/head, he is directing this signal to the lone male at upper left as he guards his female mate (barely visible behind him).
A B C D E Intensity BODY PATTERNING AND BEHAVIOR 55 Partial polarizatim Orientation of polarization 0 0.25 0.5 0.75 1.0 -/(I\- I I h &’ ’ Figure 3. Selected images demonstrating the main sources of polarization components in adult squids. LEFT: Black-and-white images of the squid. CENTER: Partial polarization images in which black represents unpolarized light -0, and white represents full linear polarization - 1. RIGHT: Orientation of polarization; horizontal polarization is coded into white or black, and vertical polarization into 50% grey. Special iridophores on the arms create the predominant components (A, B), where the partial polarization can exceed 0.75. The orientation of polarization can be equal on all arms (A) or it can vary between them (B, indicated by arrows). Structural reflection from the skin-water interface can produce a polarization pattern that changes with the animal’s motion (C). The reflection from the sclera of the eye may be highly polarized (D, arrow). The top of the mantle of the squid occasionally reflects light that is partially polarized (I?). This polarization may arise from structural reflection, as in C, or from reflection by the iridophores on the squid’s mantle or splotches (Shashar and Hanlon, 1997).
Page 1 and 2: Reference: Biol. Bull. 197: 49-62.
Page 3 and 4: Manhattan Beach, CA) such that each
Page 5: White dorsal stripe Accentuated tes
Page 9 and 10: positioning of this visual signal m
Page 11 and 12: head, and sometimes Raised arms. In
Page 13 and 14: Acknowledgments We thank Mark Simon

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