FIG. 2.

Concentrations of luminous bacteria in seawater at various distances away from a population of E. scolopes. Seawater samples were taken at points along a transect in Kaneohe Bay, Hawaii, beginning near a population of squids on the reefs at Coconut Island (34) and extending 2 km seaward. CFU of both V. fischeri (•) and the closely related (but nonsymbiotic) species V. harveyi (○) in the samples were determined as described previously (34). Error bars, when larger than the symbol, indicate one standard deviation in the data.