. Bulletins of American paleontology. Climatic and Anthropogenic Impacts: Willard et al. 51 SITES i 465 ⢠645 AD 780 - 405 BC 1975-1760 BC â rP Radiometric Dales <5«'"" <}?* ^x^* -1960 AD I â 1900 AD â .«^ PERCENT ABUNDANCE ,* ^ X*-. 0 10 20 0 10 20 30 0 10 20 0 SQUARED CHORD DISTANCE .^° Wet Prairies/ Sparse Sawgrass Marshes Sloughs I^H Myrica t -=1 Asteraceae I' 'I Sagittaha Text-figure 6.âPercent abundance of pollen of major plant groups at site 5, central Taylor Slough. SCD values show lowest squared chord distance values for modern analogs; SCD < are considered
. Bulletins of American paleontology. Climatic and Anthropogenic Impacts: Willard et al. 51 SITES i 465 ⢠645 AD 780 - 405 BC 1975-1760 BC â rP Radiometric Dales <5«'"" <}?* ^x^* -1960 AD I â 1900 AD â .«^ PERCENT ABUNDANCE ,* ^ X*-. 0 10 20 0 10 20 30 0 10 20 0 SQUARED CHORD DISTANCE .^° Wet Prairies/ Sparse Sawgrass Marshes Sloughs I^H Myrica t -=1 Asteraceae I' 'I Sagittaha Text-figure 6.âPercent abundance of pollen of major plant groups at site 5, central Taylor Slough. SCD values show lowest squared chord distance values for modern analogs; SCD < are considered to be close analogs for fossil assemblages. Cluster designations refer to clusters designated in Text-figure 3 and Table 3. 20^" Century Vegetation Vegetation at the southernmost site (site 8) changed little throughout the 20"" century, because present sa- linity levels and vegetational composition apparently were established by late in the 18"' century. Site 7, collected farther north in dwarf mangrove scrub, changed from fresh-water marshes to mangrove as- semblages in the early to mid-20"' century. This change probably reflects the combined effects of nat- ural sea-level rise and reduced fresh-water flow from the Everglades. Additional evidence for hydrologic changes along Taylor Creek is provided by examina- tion of aerial photographs taken between 1940 and 1994. These photographs show inhlling of a lake along Taylor Creek, reducing its area by about half and in- filling parts of the coastal zone west of the Taylor Creek mouth (Schaffranek et 2001). In Taylor Slough, vegetation at both sites 5 and 6 changed after 1930. At site 5, pollen of asters and sedges increased greatly, which is suggestive of greater disturbance, fluctuating water levels, and/or drier con- ditions. At site 6, mangrove abundance decreased by 1960, and marsh pollen (Cladiiim, other Cyperaceae, Poaceae, and Typha) increased to abundances unprec- edented in the pa
Size: 1499px × 1666px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookautho, bookauthorpaleontologicalresearchinstitutionithacany
