Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 
Month 
Figure 7.1. Box plot of monthly chlorophyll a data from the Yaquina Estuary (all stations from 1973- 
2006). The dashed line indicates the Oregon estuarine chlorophyll a criterion. The boxes 
represent the 25 th and 75 th percentiles, the whiskers represent the 5 th and 95 th percentiles, and 
the horizontal line is the median. 
O) 
cc 
> 
_c 
CL 
o 
i— 
o 
O 
a) Zone 1 
25- 
o 
Median = 4. 
n = 137 
-1- 
6 
T 
I 
Median = 3.3 
n= 347 
50- 
25- 
b) Zone 2 
1-r 
1/1/1973 1/1/1978 1/1/1983 
Median = 6.1 
n = 377 
-1-r 
9 
• • 
ft 
1/1/1988 1/1/1993 1/1/1998 1/1/2003 
Median = 5.3 
n = 229 
Date 
Figure 7.2 Comparison of historic and recent dry season chlorophyll a for a) Zone 1 and b) Zone 2 in 
the Yaquina Estuary. The boxes indicate the time interval for the historic and recent median 
calculations. 
i ?■ 
51 
