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Last updated: October 11, 2002
South Florida Restoration Science Forum

Nutrients

What are the biological impacts of concern?

Part 2: Vegetation Changes Over Time in the Everglades

Pollen Profile at Nutrient-enriched Site F1, WCA 2A

pollen profile

Around 1960, cattail abundance began to increase to the highest recorded levels at the nutrient enriched sites.

photo of cattail expansion
photo of mesocosm experiment
A single cattail seedling grown in nutrient enriched areas expands dramatically. A seedling grown in unenriched areas shows little or no expansion Mesocosm experiments confirm that periphyton losses along the gradient result from phosphorus additions.

John Henry Davis map of Everglades vegetation shows no cattail presence in area where cattail is abundant today.
(Click on images to view a full-sized version.)
vegetation map of south Florida
Vegetation Map of south Florida - 1943
Water Conservation Area 2 cattail map
Water Conservation Area 2 Cattail Map
June/November 1995


Next Next: Ecological Changes Along the WCA-2A Gradient


U.S. Department of the Interior, U.S. Geological Survey, Center for Coastal Geology
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Last updated: 11 October, 2002 @ 09:42 PM (HSH)