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Title: Information Feedback from Photophores and Ventral Countershading in Mid-Water Squid 
Author: Young, Richard Edward
Date: 1973-01
Publisher: University of Hawaii Press
Citation: Young RE. 1973. Information feedback from photophores and ventral countershading in mid-water squid. Pac Sci 27(1): 1-7.
Abstract: The arrangement of photosensitive vesicles and photophores in two
species of mid-water squid suggests that the vesicles function in detecting the intensity
of downward-directed surface light and the intensity of light from their own
photophores. This information is precisely what is required for an animal
to eliminate its ventral shadow by the production of a ventral bioluminescent glow.
This arrangement, therefore, offers strong support for the theory of ventral
countershading in mid-water animals.
ISSN: 0030-8870
LC Subject Headings: Squids -- Behavior

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