Algicidal potential of cultivable bacteria from pelagic waters against the toxic dinoflagellate Pyrodinium bahamense (Dinophyceae)

摘要: Associated and algicidal bacteria play roles in the succession decline of phytoplankton blooms, including those harmful algal bloom (HAB)-forming species. Limited studies on HAB-associated bacterial ecology have resulted our incomplete understanding HABs dynamics. Diverse phytoplankton-bacterial interactions also led to their potential as biocontrol tools for mitigation. Here, we tested 48 cultivable pelagic from three HAB-affected areas Philippines (Bolinao, Sorsogon, Matarinao) against non-axenic cultures toxic, thecate dinoflagellate Pyrodinium bahamense. Co-incubation with live these isolates exhibited varying levels activities suggesting that it may not be a phylogenetically conserved property. Furthermore, majority elicited activity test species P. bahamense, which was present area where were isolated, implying non-specificity action. Exposure cells pellicle cyst formation. Despite this, however, cell lysis total abundance still observed, indicating strong potency isolates. In depth interplay between environmental factors bacteria-microalgal provide significant insights management HABs.