TABLE 2.

C. roenbergensis cell abundance estimated by competitive QPCR^a

Spiked concn (cells ml−1)	Estimated concn (cells ml−1) ± SD
13	13 ± 2
39	39 ± 4
65	63 ± 17
130	104 ± 21
6.5 × 103	5.9 (± 0.3) × 103
1.3 × 104	1.3 (± 0.1) × 104

^aEel Pond seawater was collected in January 1999 and spiked with C. roenbergensis at the concentrations noted in the first column.