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FIGURE 3-1 The St. Johns River was divided into nine segments for the purposes of the ecological analyses.

SOURCE: Kinser et al. (2011).

analyzed first. Analyses of other scenarios were continued down to the scenario(s) with minor to negligible effects.

To help focus the studies on potential withdrawal effects, each workgroup, following a recommendation from this Committee, developed a conceptual model during Phase 2 of the WSIS. Most of these models were modified by the workgroups as their studies proceeded and they gained information about their system components. The conceptual models—basically box and arrow diagrams—were intended to show plausible cause-effect relationships between key environmental drivers and changes in some ecosystem attribute relevant to the ecosystem component of interest (e.g., phytoplankton, benthos, fish). In turn, the models also showed how



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