THE ORIGIN OF RECURRENT BLOOMS OF GYMNODINIUM-SANGUINEUM HIRASAKA IN A SHALLOW COASTAL LAGOON

Sediments from Esquimalt lagoon (B.C., Canada), treated to remove vege tative cells and incubated under natural conditions, developed viable Gymnodinium sanguineum Hirasaka populations. This demonstrates that as yet unidentified hypnocysts of this species may overwinter in the sed iments of the lagoon and cause locally recurrent tides, which previous literature described as probably allochthonous.