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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