Files in this Data Supplement:

• Supplemental file 1 - Primers used this study (Table S1); phylogenetic distribution of ITS-LH-PCR fragment sizes measured for representative clones (Table S2).
  Zipped PDF document, 213K.
• Supplemental file 2 - Time series of Chl a concentrations in Chesapeake Bay stations 909, 818, and 707 from 1 July 2002 to 31 August 2003 (Fig. S1).
  Zipped PDF document, 29K.
• Supplemental file 3 - Time series of remote sensed Chl a concentrations in the Chesapeake Bay region from 25 February to 14 April 2003 (Fig. S2).
  Zipped PDF document, 53K.
• Supplemental file 4 - Legends to Fig. 1 and 2.
  Zipped PDF document, 38K.