Abstract: Ecological Diversification of Vibrio fischeri During the Free-Living Phase and the Subsequent Consequences of this Bioluminescent Microbe to Grow Along a Salinity Gradient

The mutualism between sepiolid squids and the marine bioluminescent bacterium Vibrio fischeri has become an established tractable model for studying associations between prokaryotic symbionts and their eukaryotic animal hosts, since both participants can be maintained independently of each other in the laboratory (Soto et al. 2014). Within the squid host, V. fischeri cells reside in a specialized and complex morphological structure called the light organ, where they benefit from the inhabitance of a microenvironment rich in nutrients relative to the open ocean. In return, the squid utilize light produced by the bacteria for a cryptic behavior called counterillumination (Soto et al. 2009).

[Read more…]