Phylogeographic patterns in the Philippine archipelago influence symbiont diversity in the bobtail squid mutualism.

Marine microbes encounter a myriad of biotic and abiotic factors that can impact fitness by limiting their range and capacity to move between habitats. This is especially true for environmentally transmitted bacteria that cycle between their hosts and the surrounding habitat. As geologic history, biogeography, and other factors such as water temperature, salinity, and physical barriers can inhibit bacterial movement to novel environments, we chose to examine the genetic architecture of (Mollusca: Cephalopoda) and their symbionts in the Philippine archipelago using a combined phylogeographic approach.