publications > ofr > ecosystem history of southern and central biscayne bay > results: pollen assemblages and trends
Ecosystem History of Southern and Central Biscayne Bay: Summary Report on Sediment Core AnalysesU.S. Geological Survey Open File Report 03-375ResultsPollen Assemblages and TrendsPollen assemblages from No Name Bank (GLW402-NNA), Featherbed Bank (GLW402- FBA), and Card Bank (GLW402-CBA) are all strongly dominated (50- 99%) by Pinus (pine) pollen, with values decreasing during the 20th century (Figures 11-13, Appendices B, C, and D). Three assemblage zones are distinguishable in the three cores. The basal unit, zone 1, is characterized by an absence of Casuarina (Australian pine) pollen and extremely high abundance (>90%) of Pinus pollen. The base of zone 2 is marked by the appearance of Casuarina pollen; pollen of marsh taxa (grasses, sedges, asters) and fern spores are more abundant in this zone. The uppermost unit, zone 3, is distinguished by 15-20% Quercus (oak) pollen and sharp decreases in abundance of Pinus pollen to ~50%. In this unit, Casuarina and Myrica (wax myrtle) pollen also increase in abundance.
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U.S. Department of the Interior, U.S. Geological Survey
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Last updated: 10 December, 2003 @ 11:41 AM(HSH)