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patrickbdevaney
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mia9

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will be biased towards above ―baseline‖ conditions.
Defining baseline conditions for each station or segment is a complicated task
given the specific characteristics of each site, but we have determined important TN and
TP concentration thresholds separating what seems to represent nutrient baseline
conditions from those conditions that may foster significantly increased phytoplankton
biomass (CHL-a) in the water column. Such increases (blooms) may result from
93
seasonal nutrient enrichment or from environmental disturbances in general, so the
threshold may be envisioned as the mean baseline condition to guarantee a protective
nutrient level in the long run.
Figure 6.5: Chlorophyll-a Zcusum charts along TN and TP gradients for a West-East transect
in South-central Biscayne Bay. ―V-shape‖ charts indicate increasing CHLa concentration and
―peak-shape‖ charts indicate declining trend. Red, blue and yellow vertical markers are located
at threshold, median and 75th percentile of nutrient concentrations, respectively.
-160
-140
-120
-100
-80
-60
-40
-20
0
20
40
60
0.000
0.001
0.010
0.100
1.000
CHLa Z-Cusum (SD) .
TP (mg/l)
OFF CHLa CT Median Z Threshold Median TP 75pctl TP
-35
-30
-25
-20
-15
-10
-5
0 0.01
0.10
1.00
10.00
CHLa Z-Cusum
TN (mg/l)
SCI CHLa Central Tendency Threshold Median TN 75pctl TN
-50
-40
-30
-20
-10
0
10
0.01
0.10
1.00
10.00
CHLa Z-Cusum
TN (mg/l)
SCM CHLa Central Tendency Threshold Median TN 75pctl TN
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
10
20
0.01
0.10
1.00
10.00
CHLa Z-Cusum
TN (mg/l)
SCO CHLa Central Tendency Threshold Median TN 75pctl TN
-100
-80
-60
-40
-20
0
20
40
60
80
0.01
0.10
1.00
10.00
CHLa Z-Cusum
TN (mg/l)
OFF CHLa Z-Cusum Threshold Median TN 75pctl TN
-25
-20