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Environmental Constraints on the Restoration Success of Black Mangrove Habitats in the Northern Gulf of Mexico
Jonathan M. Willis, Lauren K. Alleman, Christine N. Pickens,
Laura C. Hundy, and Mark W. Hester
Coastal Plant Ecology Laboratory University of Louisiana at Lafayette
Funding provided by
Louisiana Board of Regents, CPRA/Sea Grant Coastal Science Assistantship Program NOAA CREST, UL Lafayette & Coastal Plant Ecology Lab
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Outline Background
Review of manipulative experiments
Salinity level
Water table depth
Chilling/freezing
Review of field studies
Natural propagule establishment
Seedling transplant survival at restoration site
Conclusion
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Louisiana Salt Marshes Spartina alterniflora (smooth cordgrass)
Dominant emergent macrophyte in Louisiana and throughout salt marshes of the Gulf and Atlantic Coasts of N. America
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Louisiana Salt Marshes Southern salt marshes and barrier island salt marshes
frequently have Avicennia germinans (black mangrove) growing in association with smooth cordgrass
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Value of Restoring Black Mangrove Habitat
Provides critical woody structure & habitat on barrier islands
Source: Scott Walters
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Value of Restoring Black Mangrove Habitat
Provides critical woody structure & habitat on barrier islands
Black mangrove/smooth cordgrass association may provide added ecosystem resilience to disturbance
Source: Scott Walters Source: Mike Osland
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ABIOTIC FACTORS BIOTIC FACTORS
Mangrove Propagule Establishment
Mangrove Seedling
Mangrove Population Development
Mangrove Adult
Black Mangrove Restoration Template
Predation • Herbivory • Fungal Infection
Facilitation
Competition
Accretion
Hydrology • Elevation • Tidal Inundation • Soil Moisture • Water Table • Salinity
Reproduction (per individual)
Reproduction (per area)
Nutrients
Light Level Mangrove
Dispersal Disturbance
• Sand Burial • Hurricanes • Climatic Variance
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ABIOTIC FACTORS BIOTIC FACTORS
Mangrove Propagule Establishment
Mangrove Seedling
Mangrove Population Development
Mangrove Adult
Black Mangrove Restoration Template
Predation • Herbivory • Fungal Infection
Facilitation
Competition
Accretion
Hydrology • Elevation • Tidal Inundation • Soil Moisture • Water Table • Salinity
Reproduction (per individual)
Reproduction (per area)
Nutrients
Light Level Mangrove
Dispersal Disturbance
• Sand Burial • Hurricanes • Climatic Variance
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Seedling Response to Salinity Level and Water-
Table Depth
Alleman, L. K., and M.W. Hester. 2011. Refinement of the fundamental niche of black mangrove (Avicennia germinans) seedlings in Louisiana: Applications for restoration. Wetlands Ecology and Management. 19: 47-60.
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Salinity Level Experiment
2 seedling age classes 12-month old 24-month old
5 salinity levels 0 ppt 12 ppt 24 ppt 48 ppt 96 ppt
5 replicates
50 total experimental units
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12 month old seedlings
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
0 24 48 72 96Salinity Level (ppt)
Biom
ass
(g)
AbovegroundBelowground
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24 month old seedlings
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
0 24 48 72 96Salinity Level (ppt)
Biom
ass
(g)
AbovegroundBelowground
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Source: L. Alleman
2 seedling age classes 6-month old 18-month old
5 water table depths 0 cm -15 cm -30 cm -45 cm -60 cm
3 hydrologic regimes static fluctuating bi-weekly fluctuating bi-monthly
5 replicates
150 total experimental units
Water Table Depth Experiment
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6-month old seedlings
0
1
2
3
4
5
0 -15 -30 -45 -60Water-Table Depth (cm)
Abo
vegr
ound
Bio
mas
s (g
)s taticbiweeklybimonthly
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18-month old seedlings
0
1
2
3
4
5
0 -15 -30 -45 -60Water-Table Depth (cm)
Abo
vegr
ound
Bio
mas
s (g
)s taticbiweeklybimonthly
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Leaf Characteristics 6-month old seedlings 18-month old seedlings
Water Table Depth -30 cm
Water Table Depth -60 cm
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Chilling/Freezing Injury Experiment 3 Early Life History Stages
Dispersal (in salt water) Stranded (on moist sand) Seedling (rooted in moist sand)
3 Exposure Temperatures 5.7 ˚C 2.5 ˚C -6.5 ˚C
4 Durations 2 hours 6 hours 12 hours 24 hours
5 Replicates 180 Total Experimental Units
Pickens, C. N., and M. W. Hester. 2011. Temperature tolerance of early life history stages of black mangrove, Avicennia germinans: Implications for range expansion. Estuaries and Coasts. 34: 824-830.
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0
0.2
0.4
0.6
0.8
2 6 12 24
Duration Exposure (hours)
Prop
ortio
n D
ead
0
0.2
0.4
0.6
0.8
-6.5 2.5 5.7
Temperature (°C)Pr
opor
tion
Dea
d
Significantly greater mortality with: Exposure at -6.5 C 24 hour duration of
cold exposure
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Dispersal stage propagules tended to have greatest
overall survivorship
0
0.2
0.4
0.6
0.8
1
0 7 14 21 28 35 42 49 56Time (days)
Surv
ivor
ship
Stranded Stage Propagules
Dispersal Stage Propagules
Seedling Stage
May confer advantage to surviving freeze events when
still in dispersal stage (in saline water)
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Elevation Survey: Natural Population
Alleman, L.K. and M.W. Hester. 2011. Reproductive ecology of Black Mangrove (Avicennia germinans) along the Louisiana coast: propagule production cycles, dispersal limitations, and establishment elevations. Estuaries and Coast. 34: 1068-1077.
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Establishment Elevations: Newly Established Propagules vs. Mature Trees
020406080
100120140160180200
-0.1 0 0.1 0.2 0.3 0.4 0.5Elevation (m, NAVD88)
Tree
Hei
ght (
cm)
mature trees (>12-months old)newly established propagules (<12-months old)
n = 218 n = 54
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020406080
100120140160180200
-0.1 0 0.1 0.2 0.3 0.4 0.5Elevation (m, NAVD88)
Tree
Hei
ght (
cm)
mature trees (>12-months old)newly established propagules (<12-months old)
n = 218 n = 54
Establishment Elevations: Newly Established Propagules vs. Mature Trees
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Mean water level = 0.15 m NAVD88 Mean mangrove elevation (all sites, ages) = 0.23 m NAVD88
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
18-Oct-08
01-Nov-08
15-Nov-08
29-Nov-08
13-Dec-08
27-Dec-08
10-Jan-09
24-Jan-09
07-Feb-09
21-Feb-09
07-Mar-09
21-Mar-09
04-Apr-09
18-Apr-09
02-May-
09
16-May-
09
30-May-
09
Date
Ele
vatio
n (m
, NA
VD
88)
Low water establishment windows?
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Elevation Survey: Restored Site
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Sampling Strata at Restored Site
Zone 1: Lowest Elevation
Zone 6: Highest Elevation
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Hydrograph of Restored Site
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Elevation & Hydrology: Restored Site •Zone 1-3: Lowest elevations and greatest percentage of time flooded
•Zone 5-6: Highest elevations and almost non-existent flooding
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Vegetation Cover of Restored Site
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Conclusions Seedling salt tolerance
12-month and 24-month old seedlings cannot tolerate 96 ppt Optimal growth between 24 – 48 ppt, respectively
Hydrology Best seedling growth at water-table depth range of 0 to -0.3 m Propagule and adult elevation ranges of 0.16 – 0.27 m NAVD88 (34% - 15% flooded, respectively)
Tolerance to chilling/freezing High mortality of all life stages following 24 hrs at -6.5 C Propagules have greater survivorship when in dispersal stage
Marsh platform elevation and associated hydrology is critical Work with succession Once smooth cordgrass established, hydrology should be conducive for
natural black mangrove establishment or assisted propagule dispersal
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Questions?