Ecological Patterns and Processes in Ghost Tree Islands of the Everglades
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1 Ecological Patterns and Processes in Ghost Tree Islands of the Everglades Sharon M. L. Ewe 1, Binhe Gu 2, Jennifer Vega 1 and Kristin Vaughan 1 1 Ecology and Environment Inc., South Shore Blvd, Wellington, FL South Florida Water Management District, 3301 Gun Club Road, West Palm Beach, FL
2 What are tree islands? Areas of woody vegetation within wetlands dominated by nonwoody species. Key features in the Everglades wetlands complex. Tree island Marsh Open slough
3 Everglades flow patterns Historically, the Everglades has been a River of Grass. In the wet season, water flow extended north of Lake Okeechobee into Florida Bay as sheetflow, ~50 cm deep and km across. Today, it is a highly compartmentalized and regulated system.
4 Impacts on Tree Islands Tree islands have been adversely impacted by compartmentalization of the Everglades ecosystem Wet season Tree island Marsh Open slough Dry season Tree island Marsh Open slough Tree islands are only 5% of total land mass but are a key habitat within the Everglades as they: a) support high biodiversity b) are a refugia for fauna in the wet season c) are nutrient sinks (soil phosphorus hotspots)
5 Status of tree islands in Everglades For >50 years, the ecology and physiology of tree islands have been altered by water management. >60% of the tree islands have been lost. >90% of the tree islands in Water Conservation Area 2A have been lost.
6 What is a Ghost island? Ghost island is a tree island with significant loss in community structure i.e. degraded islands Healthy vegetation. Live island Ghost island Ghost island appears to be just a scar in the landscape. Area with the most number of ghost islands is WCA-2. Today there are only 3 living tree islands in WCA-2.
7 Issues/Concerns Live island Ghost island Can ghost tree islands be restored? Part of the CERP goal: halt tree islands loss by 2020 (1999 Baseline Report for CERP) Eventual goal: restore tree islands in the Everglades
8 Objectives Assess microtopography, soil structure and chemistry, and vegetation patterns of living and ghost tree islands in WCA- 2A. Review aerial imagery to understand trajectory of island loss. Objective: increase understanding of the ecology and biogeochemistry of these islands and how to implement island restoration. Live tree islands Loss of island structure and function Ghost islands RESTORATION
9 Study location in WCA-2A Sampling in WCA 2A across a hydrologic range 10 islands surveyed: 8 ghost + 1 live island,1 additional dying island surveyed Live: 2A Dying: 2A-22-4 North: 2A-22-27, 2A-17-2, 2A Central: 2A-14-2, 2A-16-1 South: 2A-15-6, 2A-12-6,2A-11-1
10 Sampling Design Sampled in transects across the islands based on current discernible extent of island HEAD MIDDLE NEARTAIL Legend: Transect Primary soil sampling locations Pre-impoundment direction of water flow
11 1a. Measuring soil topography Tree island Marsh Open slough PVC sounding rod used to assess elevation every 10 m. Measured from across island from nearest western ridge to eastern ridge.
12 1b. Bedrock topography Tree island Marsh Open slough Metal rod used to assess changes in bedrock every 20 m. 20+ km of transects across 10 islands measured (~2000 shallow and ~1000 deep points measured).
13 Depth relative to surface water level (cm) Results 0 2A-15-6 Dineen s Island Head Western island edge Eastern island edge Distance from historic center of island (m) Average depth to bedrock (all transects): 161 cm Pinnacle rock and elevated soil surfaces observed at the historic center of some island heads (example above).
14 Depth relative to surface water level (cm) Results 0 Dineen s Island Mid-island Western island edge Eastern island edge Distance from historic center of island (m) Limited topographic highs mid-island. No large trees observed, only sawgrass (Cladium jamaicense) and some open water.
15 Depth relative to surface water level (cm) Results 0 Dineen s Island Neartail Western island edge Eastern island edge Distance from historic center of island (m) No large trees and short (<2 m) sawgrass observed.
16 Results Data supports the 3 theories of island formation Many islands still show evidence of historic edge boundary Depth relative to surface water level (cm) A Pinnacle rock Head Depth relative to surface water level (cm) Bedrock Depression 2A Head Depth relative to surface water level (cm) Distance from historic center of island (m) 2A No high Head Distance from historic center of island (m) Distance from historic center of island (m)
17 2. Soil Core Collection Total: 150 short cores collected (15/island) HEAD Cores cut in 2.5 cm intervals for top 10 cm, 5 cm intervals from cm MIDDLE NEARTAIL Parameters analyzed: bulk density, %C, %N, %P, 13 C, 15 N 0-30 cm
18 Results Total Phosphorus distribution in 10 Live and Ghost Tree Islands and the surrounding marsh Island : mg/kg Slough: mg/kg 479 (402) Highest TP = mg/kg (2A-16-1, head, 25-30cm) 2747 (320) 4091 (369) 1495 (341) 350 (302) Lowest TP = 34 mg/kg (2A-14-2, neartail, 25-30cm) 3664 (415) 7012 (245) Legend: White: island name Blue: island soil TP(mg/kg) Red: slough soil TP(mg/kg) 3164 (315) 3237 (267) 3409 (335)
19 Results The Everglades is a Phosphorus-limited system. Phosphorus availability drives productivity. Everglades tree islands are phosphorus hotspots. Island restoration may be more likely if high P is observed. Phosphorus hotspot : TP concentration tree island soils >1000 mg/kg (twice as high as the soil TP concentration in pristine marsh) Two islands did not have a P-hotspot.
20 Fish bones Bird guano Results Eight of the 10 islands had 1 P-hotspots at the head. One Hotspot (n = 2) Two Hotspots (n = 3) Three Hotspots (n = 2) P concentrations increased with depth at the head.
21 3. Vegetation Assessment At soil core collection locations: Average height, dominant species, canopy condition, emergent species, exotics vegetation height, % cover wildlife utilization 450 vegetation samples collected, dried and bagged for nutrient analyses. West Quadrant 5 m North Quadrant 2 m South Quadrant East Quadrant
22 RESULTS Canopy ranged from 10-20% cover and was 1-2 m tall. Woody species were limited only to the head of the islands. Middle and neartail of islands was sawgrass (13-51% cover). Dominant species were willow (Salix caroliniana), bayberry (Myrica cerifera), and sawgrass. Islands with woody species present may have a greater success in being restored. 1.8 m 1.4 m 1.3 m 1.2 m 0 m 2.7 m 1.1 m 1.8 m 1.2 m Neartail of m Average island vegetation height.
23 4. Aerial Assessment Focused on Dineen s Island (2A-15-6) Examined changes in island extent over time
24 Results: temporal patterns Inter-decadal fluctuations of Dineen s island areal extent observed Eastern boundary appears more dynamic than western edge
25 Temporal patterns Dineen s Island woody tree extent has declined (1940-present) Community phase shifts observed between decades Woody plants throughout island Cattail dominated island Sawgrass dominated island
26 Results 1. Long-term datasets provide insight into shifts in areal extent 2. Community-level changes are clearly captured at decadal time scales Tree island in WCA 3. Note the woody tree extent down the length of the island. Ghost tree island in WCA 2. Note only the trees on the head of island.
27 Implications for Restoration There is still remnant vegetation and soil microtopography on some ghost islands. Islands with elevated soils and bedrock topography, high TP levels, and with remnant woody vegetation at the head may be suitable for restoration efforts. Restoration efforts have to be accompanied by long-term hydrologic changes. 2A Total P (mg kg -1 ) Slough west Island west Island center Slough east Island east Island center Island east Island west Slough east Slough west Head Mid island Neartail
28 Next step? Identify criterion for successful restoration of drowned ( ghost ) tree islands in WCA 2A. Identify restoration end-points. Implement adaptive restoration practices? Cypress island Live tree islands Loss of island structure and function Ghost islands RESTORATION
29 Acknowledgements E&E Interns and staff: Russel Bahe, Colin Johnson, Robert Sekerka, Joan Altwater SFWMD: Ted Schall, Christopher McVoy, Martha Nungesser, Carlos Coronado, Colin Saunders, Fred Sklar Airboat: J.K. Jones Airboat, Jamie Breig
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