Temporal variation of the incidence of H. perezi DNA in MD and VA coastal bays. Detection of H. perezi in samples from the Chincoteague Bay from April to November 2011. Panel 4A shows results from the sediment. Panel 4B shows results from water/plankton. Results are displayed as H. perezi ribosomal gene copy number per g sediment or per 1 L water/plankton (blue = Sinnickson, green = Verrazano Bridge, red = Newport Bay, purple = Tom’s Cove, yellow = Trappe Creek).