. The ecology of the Apalachicola Bay system : an estuarine profile. Estuarine ecology -- Florida Apalachicola Bay; Estuarine area conservation -- Florida. Sound vary from polyhaline to euhaline (> 10 ppt) conditions. Gorsline (1'363) alluded to the vertical isohaline conditions of the estuary except for areas that are deep or near the inlets. Livinqston (1*^78, 1984a), however, has documented seasonal vertical salinity stratification in various parts of the estuary, especially in areas affected most directly by the river. Differences of surface and bottom salinities of as much as 5-10 ppt
. The ecology of the Apalachicola Bay system : an estuarine profile. Estuarine ecology -- Florida Apalachicola Bay; Estuarine area conservation -- Florida. Sound vary from polyhaline to euhaline (> 10 ppt) conditions. Gorsline (1'363) alluded to the vertical isohaline conditions of the estuary except for areas that are deep or near the inlets. Livinqston (1*^78, 1984a), however, has documented seasonal vertical salinity stratification in various parts of the estuary, especially in areas affected most directly by the river. Differences of surface and bottom salinities of as much as 5-10 ppt during periods of stratification further complicate the exact dimensions of the salinity regime in a given area of the bay system through time. However, by most statistical measures, river flow is the chief determinant of the salinity structure of the estuary (Meeter and Livingston 1P78). periods of high local precipitation (Figure 14). Salinitv qenerally peaks during the fall drought (October-November), Long-term salinity trends follow river flow fluctuations; low salinity was noted for a prolonged period throughout the estuary during the heavy river flow conditions of the winter of 1972-73, although various factors combine to shape the long-term (multiyear) salinity trends in the estuary. Various statistical analyses (Meeter and Livingston 1978; Meeter et al. 1°79) have made a strong association of Apalachicola River flow with the spatial/temporal distribution of salinitv throughout the bay system. There are persistent seasonal patterns of salinity in the Apalachicola estuary, although such patterns are modified by annual variation of river flow and fluctuations of local rainfall. Low bay salinities coincide with high river flows during winter and spring periods; secondary salinity reductions occur in the bay system during late summer-early fall Table 2. Bottom salinities in parts per thousand at stations in the Apalachicola estuary. All data represent 5-year means (1972-77)
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