. Bulletins of American paleontology. wetter -*- 2000- 1990- 1980- 1970- 1960- 1950- 1940- 1930 1920 1910- 1900- 1890- 1880- 1870 Park Key % L. matagordensis 10 15 20 25 30 35 I I I I I I Bob Allen Key. —I 1 1 1 1 45 40 35 30 25 20 ( ) 10 20 30 4( 1 1 1 1 ^3^ 1990- 1980- 1970- 1960- "^^C^^- 1950- 1940- —==^I_JJ-L 1930- ^^S=- 1920- 1910- 1900- J. 1890- 1880- 1 tt 7n 1 1 1 1 1 45 40 35 30 25 20 Winter rainfall () cm/yr (7-point smooth) -? drier Text-figure 13.—Plot of relative frequency of L. maragoidensis at Russell Bank, Park Key and Bob Allen Key compared to winter rainfall in
. Bulletins of American paleontology. wetter -*- 2000- 1990- 1980- 1970- 1960- 1950- 1940- 1930 1920 1910- 1900- 1890- 1880- 1870 Park Key % L. matagordensis 10 15 20 25 30 35 I I I I I I Bob Allen Key. —I 1 1 1 1 45 40 35 30 25 20 ( ) 10 20 30 4( 1 1 1 1 ^3^ 1990- 1980- 1970- 1960- "^^C^^- 1950- 1940- —==^I_JJ-L 1930- ^^S=- 1920- 1910- 1900- J. 1890- 1880- 1 tt 7n 1 1 1 1 1 45 40 35 30 25 20 Winter rainfall () cm/yr (7-point smooth) -? drier Text-figure 13.—Plot of relative frequency of L. maragoidensis at Russell Bank, Park Key and Bob Allen Key compared to winter rainfall in South Florida (NOAA region #5) for the period 1880-1995. The rainfall record is a 7-point running mean. Note that during most dry periods, when Florida Bay salinity was high, L. matagordensis abundance is low; the opposite situation is seen during wet periods. See text. There is also a large body of literature on 20"' cen- tury trends in extreme weather events, including trop- ical cyclones and extra-tropical storms (see NichoUs et ai, 1996). Most studies, however, have been carried out on global or hemispheric scales and the impact of long-term climate trends on Florida is uncertain. One exception is the study of a 240-yr isotope record from a Monastrea coral from Biscayne Bay, Florida by Swart et al. (1996b). They discovered from oxygen isotopic patterns that the 20"' century may have been significantly wetter that most of the 18"" and 19"' cen- turies. If such a trend were characteristic of the latter part of the 20"' century in the nearby Florida Bay area, one would expect the net effect to be a long-term de- crease in salinity, rather than increasing periods of hy- persalinity. At this time, the climatological and canal hypotheses seem to account for observed temporal trends in epi- phytes and vegetation described above. Natural pro- cesses have certainly exerted strong influence on Flor- ida Bay habitats over the past century and contin
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