The ecology of the Apalachicola The ecology of the Apalachicola Bay system : an estuarine profile ecologyofapalach00livi Year: [1984] Figure Island. Aerial view of St. Vincent aquifer conditions; all fresh water is derived from rainfall. Silty clav sediments at depths between and m (25-30 ft) below the sandy surface create an impermeable barrier to separate rain- derived fresh water from the surrounding salt water. There is a shallow lens of fresh water beneath the island. Some of this fresh water, modified by transpiration and evaporation, is eventually discharged into the Gulf and l
The ecology of the Apalachicola The ecology of the Apalachicola Bay system : an estuarine profile ecologyofapalach00livi Year: [1984] Figure Island. Aerial view of St. Vincent aquifer conditions; all fresh water is derived from rainfall. Silty clav sediments at depths between and m (25-30 ft) below the sandy surface create an impermeable barrier to separate rain- derived fresh water from the surrounding salt water. There is a shallow lens of fresh water beneath the island. Some of this fresh water, modified by transpiration and evaporation, is eventually discharged into the Gulf and lagoonal marine systems. ?.2. CLIMATE Temperature The climate in the Apalachicola basin is mild, with a mean annual temperature of 20° C (68° F). Temperature varies with elevation and proximity to the coast. The mean annual number of days with temperatures at or below freezing is 20 at Lake Seminole and 5 along the Gulf Coast (National Oceanic and' Atmospheric Administration, unpublished data; Clewell 1°77). Livingston (unpublished manuscript), working with long-term (40-year) climatological data, found that temperatures usually peak in August with lows from December to February, at which time monthly variance is maximal. While peak summer temperatures are similar from year to year, winter minima vary. A time- series (spectral) analysis indicates that there is a long-term period of recurring low winter temperatures of 118 months (
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