120
TABLE 4:
-1
Growth rates (~day ) of natural populations from Tampa Bay
(Runs I-V) and the central Gulf of Mexico (Run VI) based on changes in
chlorophyll concentrations.
Values are ±l S.D.
Growth rates in the
diluted samples were compared to the undiluted sample with ANOVA and a
t-statistic.
Trial
Sample, % dilution
I
0
20
50
70
90
II
0
50
III
0
50
IV
0
25
50
V
0
25
50
VI
0
50
** - significant difference at P
0.01
* - significant difference at P
0.05
day -1
~
0.29 ± 0.06
0.36 ± 0.09*
0.33 ± 0.09
0.72 ± 0.23**
**
0.49 ± 0.05
0.77 ± 0.07
0.94 ± 0.12*
0.45 ± 0.16
0.18 ± 0.14**
0.74 ± 0.21
0.95 ± 0.08*
0.80 ± 0.12
0.53 ± 0.47
0.64 ± 0.36
0.82 ± 0.21
0.68 ± 0.31
1. 61 ± 0.23*
Examples of growth rates measured during short-term incubation of
undiluted natural populations in dialysis tubes are presented in Table
5.
Several diatom species in the oligotrophic slope waters of the