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Salinity |
(ppt) |
Juv. Adult |
0-30 |
14-37 |
14-37 |
14-37 |
14-37 |
0-30 |
0-30 |
0-30 |
0-30 |
0-40+ |
0-40+ |
0-40+ |
5-25 |
0-40+ |
Table 3b |
Salinity and Habitat Requirments of Potential Faunal Indicator Species |
Species |
Substrate |
&/or |
habitat |
Comments |
Lutjanus griseus |
Grey snapper |
Estuaries, marine waters, |
seagrasses & |
tidal creeks |
Habitat for early juveniles includes tidal mangrove |
creeks |
Myteroperca microlepis |
Gag grouper |
Estuaries, marine waters, |
seagrasses |
Early juveniles use seagrass beds, then migrate to |
offshore. |
Megalops atlanticus |
Tarpon 1-10 10-37 |
Estuarine & |
marine |
waters |
Obligate air-breather; early juveniles use shallow |
tidal ponds |
Mugil spp |
Mullet |
Estuarine & |
marine |
waters |
Bottom feeder; shallow estuarine waters preferred |
by early juveniles |
Opsanus beta |
Gulf toadfish |
Estuarine & |
marine |
waters |
Generalist; benthic feeder |
Sphyraena barracuda |
Great barracuda 8-37 10-37 |
Estuarine & |
marine |
waters |
Predatory, may carry dinoflagellate-based ciguatera |
poisoning when feeding on some tropical reefs |
2-22 |
Salinity |
(ppt) |
Juv. Adult |
10-40 |
10-37 |
11-37 |
Potential Alternative Approaches for MFL Development for Biscayne Bay |
Freshwater Flow and Ecological Relationships in Biscayne Bay 5-1 |
SECTION 5 |
POTENTIAL ALTERNATIVE APPROACHES FOR MFL |
DEVELOPMENT FOR BISCAYNE BAY |
STATIC AND DYNAMIC HABITATS |
Browder and Moore (1981) introduced the concept of dynamic and stationary or |
static habitats (Figure 15) to differentiate the two important components of |
estuarine habitat. Static habitat components are those more fixed in time and |
location. These are the classic habitats, such as mangrove forests and seagrass |
meadows, that are typically fixed in place. Only over very long time frames can |
they move. An example of this movement is the reports by Ross et al. (2000, 2002) |
of migration of the edge of the white zone landward due to salt water intrusion |
over a fifty year period. |
The dynamic habitat component is typically a water quality parameter such as |
salinity or dissolved oxygen, or a water volume or level parameter. These are |
components that can change very quickly, often on a daily basis. The point that |
Browder and Moore (1981) initially made was that it is the overlap of specific |
dynamic and static habitat components produces the optimum productivity |
within a given ecosystem (Figure 15). |
Figure 16 shows a typical estuarine stream ecosystem with an overlay of salinity |
zones as they might appear in a normal flow situation. Tidal flows and inputs of |
freshwater inputs are shown (diagram modified from Mitsch and Jorgenson |
2004). Figure 17 shows a similar diagram for a hypothetical groundwater |
discharge into the Bay similar to that reported by Kohout and Kolipinski (1967). |
Figure 18 shows a typical static feature added to the figure (a seagrass meadow). |
Figure 19 shows how the interaction of the salinity regimes (dynamic |
component) and the location of the seagrass meadow (static component) produce |
some seagrasses within the euhaline and mesohaline zone, but the majority of |
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