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Cover photograph (Copyright © 2009, American Society for Microbiology. All Rights Reserved.): The symbiotic population of Vibrio fischeri bacteria from the light organ of a field-caught Hawaiian bobtail squid (Euprymna scolopes) exhibits heterogeneity for a variety of traits: bioluminescence, motility rate, and colony pigmentation. In this false-color image, the bacteria from a single light organ spread on a solid medium are emitting different intensities of light. The brightest colonies are white, dimmer ones are yellow, and the dimmest are blue. In the thicker region of the streak (lower right), the colonies have all become very dim because they are crowded. Coupled with genetic evidence, such phenotypic heterogeneity indicates that the symbiont population structure in the light organ of each host is polyclonal. (See related article on page 193.)
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