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CS MBS NCI |
NCO NNB SCI |
SCM SCO SNB |
45 |
Total Phosphorous (TP) |
Compared to most estuaries worldwide, phosphorous concentrations in Biscayne |
Bay are extremely low. Mean TP concentrations are lowest (<=0.007 mg/l) for CS, NCI, |
NCO, SCM and SCO, while the highest means occur in North Biscayne Bay (NNB |
=0.011 mg/l and SNB =0.09 mg/l) reflecting urban impact. Total phosphorous does not |
show any seasonal pattern and values are rather flat along the year with just a faint |
increase of TP values from May to December is suggested from Fig 3.15. Extreme |
sporadic high values occur associated to anthropogenic and storm driven inputs, as |
occurred in MBS after the impact of hurricanes Katrina, Rita and Wilma in 2005 (i.e. |
0.096 mg/l). |
Figure 3.15: Seasonal variability of Total Phosphorous (TP) in Biscayne Bay waters |
Previous researchers in the coastal Everglades have suggested an ―upsidedown‖ control on nutrient supply, with seawater providing the limiting nutrients, (Childers |
et al. 2006). This concept has been extrapolated to most south Florida’s estuaries, but |
our results indicate otherwise for Biscayne Bay. In fact, waters most influenced by |
oceanic input (SCO) have average and median TP concentrations lower than most |
Biscayne Bay waters (Fig 3.15). Perhaps in the past, when the watershed was still |
pristine, natural overland flow across the Everglades freshwater marshes allowed an |
effective fixation of the already low phosphorous in vegetation and soils, making land |
0 |
.005 |
.01 |
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