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Willard, Debra, 2007, South Florida Pollen Data.
Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.001. Longitudes are given to the nearest 0.001. Latitude and longitude values are specified in Degrees and decimal minutes.
The horizontal datum used is North American Datum of 1983.
The ellipsoid used is Geodetic Reference System 80.
The semi-major axis of the ellipsoid used is 6378137.
The flattening of the ellipsoid used is 1/298.257.
Project personnel included Anne Bates, Christopher Bernhardt, Patrick Buchanan, Margo Corum, Julie Damon, Charles Holmes, David Korejwo, Bryan Landacre, Harry Lerch, Marci Marot, James Murray, William Orem, Tom Sheehan, Neil Waibel, Lisa Weimer (deceased) , and Debra Willard.
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Terrestrial ecosystems of south Florida have undergone numerous human disturbances, ranging from alteration of hydroperiod, fire history, and drainage patterns from the introduction of the canal system to expansion of agricultural activity to the introduction of exotic species, Over historical time, dramatic changes in the ecosystem have been documented and these changes have been attributed to various human activities. However, the natural variability of the ecosystem was unknown and needed to be determined to assess the true impact of human activity on the modern ecosystem. The project was designed to document historical changes in the terrestrial ecosystem quantitatively, to date any changes and determine whether they resulted form documented human activities, and to establish the baseline level of variability on the south Florida ecosystem to estimate whether the observed changes are greater than would occur naturally.
Sediment cores were collected using a piston corer with a 10 cm diameter core barrel. The core barrel was pushed through the sediments until it contacted the underlying limestone at all sites except in Loxahatchee NWR, where peat thicknesses in excess of 2 meters would require alternative coring strategies. After core collection, sediment was extruded from the core barrel and sampled it at 1 cm increments for the upper 20 cm and at 2 cm increments at greater depths. Sediment lithology was described as samples were extruded. Samples were dried in a 50 deg C oven and subsampled sediments at the base of each core and at 20 cm increments above the base for radiocarbon dating. Bulk peats were dated using conventional radiocarbon dating
Age models for the last century of deposition are based on 210Pb (lead-210) and, where applicable, first occurrences of pollen of the exotic plant Casuarina which was introduced to south Florida in the late 19th century (Langeland, 1990). Lead-210 (210Pb) activity was measured by alpha spectroscopy using the method outlined in Flynn (1968) in which 210Pb and its progeny, polonium-210 (210Po), are assumed to be in secular equilibrium. Supported 210Pb activity was determined by continuing measurements until activity became constant with depth. Excess 210Pb activity was calculated by subtracting the supported 210Pb activity from the total 210Pb activity. Accumulation rates were calculated by fitting an exponential decay curve to the measured data using least squares optimization and making the assumptions of a constant initial excess lead-210 concentration (the CIC [constant initial concentration] model).
In pre-20th century sediments, models are derived from linear interpolation between radiocarbon data points obtained on bulk sediment samples, which were calibrated to calendar years using the Pretoria Calibration Procedure (Stuiver et al., 1993; Talma and Vogel, 1993; Vogel et al., 1993). The shorter hydroperiods and shallower water depths on tree-island heads result in seasonal drying and oxidation of sediments. Radiocarbon dates from tree-island head sediments appear to be artificially old relative to those in the tail and adjacent marsh. Cores collected in the near tail, directly downstream from the head, have radiocarbon dates and vegetational trends that are consistent both internally and with adjacent wetlands. Therefore, cores were used from the near tail as our representative sites to detect vegetation changes on teardrop-shaped tree islands and for comparison with patterns documented in the adjacent marsh.
Approximately 0.5-1.0 gram of dry sediment was used for palynological analysis. Pollen and spores were isolated from these samples using standard palynological techniques (Traverse, 1988; Willard et al, 2001a,b). After drying and weighing samples, Lycopodium marker tablets with known concentrations of Lycopodium spores were added to approximately 0.5 g of sediment for calculation of absolute pollen concentrations (Stockmarr, 1971). The samples were first acetolyzed (9 parts acetic anhydride : 1 part sulfuric acid) in a hot-water bath (100 deg C) for 10 minutes, then neutralized, and treated with 10% KOH in a hot-water bath for 15 minutes. Neutralized samples were sieved with 10 µm and 200 µm sieves, and the 10-200 µm fraction was stained with Bismarck Brown, mixed with warm glycerin jelly, and mounted on microscope slides. Raw data for pollen samples are reposited in the North American Pollen Database (NAPD) at the World Data Center for Paleoclimatology in Boulder, CO (<http://www.ngdc.noaa.gov/paleo/pollen.html>) and at the US Geological Survey South Florida Information Access (SOFIA) site (<https://sofia.usgs.gov>).
Pollen and spore identification (minimally 300 grains per sample) was based on reference collections of the United States Geological Survey (Reston, VA) and Willard et al. (2004). Absolute pollen concentrations were calculated using the marker-grain method described by Benninghoff (1962). Marker tablets of Lycopodium spores were the source of the exotic grains, and the quantity of Lycopodium spores in the marker tablets was determined by the manufacturer with a Coulter Counter following the procedures of Stockmarr (1973). Absolute pollen concentration was calculated using the formula (Maher, 1981):
Pconc=RM/V, Where: Pconc = pollen per gram dry sediment; R=pollen grains counted/marker grains counted; M=marker grains added; V=dry weight of sediment
The interpretations of past plant communities are based on the quantitative method of modern analogs (Overpeck et al., 1985). We calculated squared chord distance (SCD) between down-core pollen assemblages and a suite of 197 surface samples collected throughout southern Florida in the early 1960s and 1995-2002 (Willard et al., 2001b and this research) to define the similarity between each fossil and modern pollen assemblage. Internal comparison among surface samples from ten vegetation types indicates that samples with SCD values < 0.15 may be considered close analogs (Willard et al., 2001b). If analogs were present for a fossil assemblage, the source vegetation for the fossil assemblage was identified as one of the twelve types represented in the modern database. Cores were divided into pollen zones based on a combination of visual inspection, objective zonation using CONISS (Grimm, 1992), and modern analogs.
Person who carried out this activity:
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Willard, Debra A. Weimer, Lisa M., 1997, Palynological Census Data from Surface Samples in South Florida: USGS Open-File Report 97-0867, U.S. Geological Survey, Reston, VA.
Willard, Debra A., 1997, Pollen Census Data from Southern Florida: Sites Along an Nutrient Gradient in Water Conservation Area 2A: USGS Open-File Report 97-0497, U.S. Geological Survey, Reston, VA.
Willard, Debra A. Bernhardt, Christopher E.; , 2004, Atlas of Pollen and Spores of the Florida Everglades: Palynology 28, American Association of Stratigraphic Palynologists, Arlington, TX.
Marshall, Curtis H. Pielke, Roger A., Sr.; Stey, 200401, The Impact of Anthropogenic Land-Cover Change on the Florida Peninsula Sea Breezes and Warm Season Sensible Weather: Monthly Weather Review v. 132, n. 1, American Meterological Society, Boston, MA.
Willard, Debra A. Weimer, Lisa M.; Riegel, W., 2001, Pollen assemblages as paleoenvironmental proxies in the Florida Everglades: Review of Palaeobotany and Palynology v. 113, n. 4, Elsevier Science B.V., Amsterdam, The Netherlands.
Willard, D. A. Holmes, C. W.; Korvela, M. , 200302, Paleoecological Insights on Fixed Tree Island Development in the Florida Everglades: I. Environmental Controls: Kluwer Academic Publishers, Dordrecht, Netherlands.
Sklar, F. H. and van der Valk A. (editors)
Bernhardt, C. E. Willard, D. A.; Marot, M.; , 2004, Anthropogenic and natural variation in Ridge and Slough pollen assemblages: USGS Open-File Report 2004-1448, U.S. Geological Survey, Reston, VA.
Willard, D. A. Holmes, C. W.; Weimer, L. M, 2001, The Florida Everglades Ecosystem: Climatic and Anthropogenic Impacts over the Last Two Millenia: Bulletins of American Paleontology v. 361, Paleontological Research Institute, Ithica, NY.
Grimm, E. C., 1992, CONISS: a Fortran 77 program for stratigraphically constrained cluster analysis by the mothod of incremental sum of squares: Computers & Geosciences v. 13, issue 1, Elsevier Science, Ltd., Amsterdam, The Netherlands.
Traverse, A., 1988, Paleopalynology: Unwin Hyman, Boston, MA.
Stockmarr, J., 1971, Tablets with spores used in absolute pollen analysis: Pollen et Spores v. 13, Museum national d'histoire naturelle, Paris, France.
Overpeck, J. T. Webb, III, T.; Prentice, I., 1985, Quantitative interpretation of fossil pollen spectra: Dissimilarity coefficients and the method of modern analogs: Quaternary Research v 23, issue 1, Elsevier Science, Ltd., Amsterdam, Netherlands.
Riegel, W. L., 1965, Palynology of environments of peat formation in southwestern Florida: The Pennsylvania State University, University Park, PA.
Willard, D. A., 2004, Tree Islands of the Florida Everglades - Long-term stability and response to hydrologic change: USGS Fact Sheet 2004-3095, U.S. Geological Survey, Reston, VA.
Bernhardt, C.E Willard, D. A., 2007, Marl prairie vegetation response to 20th century hydrologic change: USGS Open-File Report 2006-1355, U.S. Geological Survey, Reston, VA.
Willard, D. A. Cronin, T. M., 2007, Paleoecology and ecosystem restoration: case studies from Chesapeake Bay and the Florida Everglades: Frontiers in Ecology and the Environment vol. 5, issue 9, Ecological Society of America, ithica, NY.
Willard, D. A. Bernhardt, C. E.; Holmes, C, 2006, Response of Everglades tree islands to environmental change: Ecological Monographs v. 76, n. 4, Ecological Society of America, Ithica, NY.
Langeland, K., 1990, Exotic Woody Plant Control Florida: Circular 868, Florida Coooperative Extension Service, Florida.
Flynn, W. W., 1968, The determination of low levels of polonium-210 in environmental materials: Analytica Chimica Acta v. 43, Elsevier B. V., Amsterdam, The Netherlands.
Stuiver, M. Reimer, P. J., 1993, Extended 14C database and revised CALIB 3.0 14C age calibration program: Radiocarbon v. 35, n. 1.
Talma, A. S. Vogel, J. C., 1993, A simplified approach to calibrating C14 dates: Radiocarbon v. 35, n. 2, University of Arizona, Tucson, AZ.
Data from all cores were used in absolute pollen concentration calculations
For 12 of the sites from the 1960's, original raw data on total pollen grains was unavailable so back-calculations from percentages in Riegel, 1965 (Doctoral thesis, The Pennsylvania State University) to original counts were unavailable.
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South Florida Pollen Data
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|Data format:||Each file contains data for a specific time period in format MS Excel (version unknown) Size: 0.094|
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