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And Storm Surge Events on Coastal Vegetation Communities

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And Storm Surge Events on Coastal Vegetation Communities Predicting and detecting consequences of SLR and storm surges on coastal vegetation regime shifts Jiang Jiang2,*, Don DeAngelis1, Tom Smith1 Su-Yean Teh3, Hock-Lye Koh3 1U.S.Geological Survey, 2University of Miami, 3Universiti Sains Malaysia * Position starts August: NIMBioS Postdoctoral Fellow • Mangroves bound freshwater vegetation types like hardwood hammocks or freshwater marsh, forming sharp ecotones. • “Ecotone”– a zone of relatively rapid Mangrove-Hardwood Hammock change between two Ecotone at Key Largo communities. Martin Ken et al 1997 • What maintains the sharp ecotone? – The ‘switch’ hypothesis – The ‘environmental gradient’ hypothesis • Can this ecotone undergo rapid shifts? Switch: Forest/Mire Ecotone (Agnew and Wilson,1993) Height of wood Stable boundaries Mire Positive feedback loop maintaining forest/mire boundary The ‘Switch’ Hypothesis for mangrove/hammock ecotone Positive feedbacks between vegetation and salinity maintain a sharp boundary. + low salinity Hammock Salinity - stable state + Mangrove Salinity high salinity - stable state The ‘Environmental Gradient‘ Hypothesis Sharp environmental change might also create a sharp ecotone of hardwood hammocks- mangrove community. H H H H H H M H M M Mean high tide M M M Mean low tide We have tested these hypotheses with a model, SEHM. Model overview--SEHM (Spatially Explicit Hammocks and Mangroves) Birth Growth Reproduce Death Red = mangrove This is an individual based Blue = hammock simulation model Inland Hammocks Mangroves Sharp boundary Seaward Elevation gradient can create sharp ecotone near mean tidal height. Clumped distribution The model showed that both mechanisms But positive feedback can create sharp contribute to the sharp boundaries even with homogeneous boundary topography. • What maintains the sharp ecotone? – The ‘switch’ hypothesis – The ‘environmental gradient’ hypothesis • Can this ecotone undergo rapid shifts? – Storm surges may overcome the stabilizing positive feedbacks – This could possibly create a ‘regime shift’, moving the mangrove/freshwater vegetation ecotone inland in a ‘jump’. 1998 Lostmans River Ranger Station (LRS) in Florida in January 1998 (above), 2005 and in October 2005 (below), just after Hurricane Wilma. This also produced an overwash of salinity inland from the coast Smith et al. 2009 • Sea level rise and storm surges may be beyond our control. • But understanding the potential for regime shifts of vegetation types due to storm surges may help us lessen their effects. • “Regime shift – a relatively sharp temporal change from one regime to a contrasting one, where a regime is a dynamic ‘state’ of a system” Scheffer 2009 1928 1995 Harney River Transition SH4 SH5 SH4 = mangrove end SH5 = sawgrass end For example: Is the shift in this boundary the result of storm surges, or simply a gradual change due to SLR? Tracks of hurricanes 1851-2006 What is the potential for a storm surge from a hurricane to cause regime shifts in vegetation? Resilience and Regime shift System Alternative stable domains Only one stable domain in this case Gunderson, 2000 Hypothesized mechanism of vegetation transition (regime shift) H H Increased salinity from storm H H surge accompanied by mangroves seedling transport H H H M M M M M Further salinity Increase Simplify the system to a mathematical model… • Two competing vegetation types • One inhibitor - Salt Intolerant Salt Tolerant Species (N1) - Species (N2) - + Inhibitor: salinity (S) • The model produces two basins of attraction with alternative stable states, divided by a separatrix. • Resilience is tendency to Resilience S remain in same basin. • Regime shift is tendency to move to another basin following perturbation. N2 N1 Possibility of alternative 20 15 10 stable states occurs only S 5 20 0 5 over a certain range of 15 4 5 3 4 3 10 2 S 2 1 1 N 0 2 0 N values groundwater 5 1 20 0 15 5 salinity 4 5 3 4 10 2 3 S 2 1 1 N 0 0 2 N 5 1 g=20 20 0 15 5 4 5 3 4 10 S 2 3 2 1 g=8 1 N 0 0 5 2 N 1 20 0 15 5 4 5 3 4 10 S 2 3 2 1 1 g=5 0 5 N 0 N 2 1 0 5 4 5 3 4 2 3 2 g=3 1 1 0 N 0 N 2 1 g=0 Groundwater salinity (g) increases dS 1N2 0 g g S dt k N2 Numerical evaluation of resilience to salinity overwash of different durations Perturbation occurs here Short salinity perturbation, salt-intolerant species is resilient and returns to steady state Long salinity perturbation, salt-intolerant species undergoes regime shift to salt tolerant species Hurricane Wilma: Oct 2005, Category 3 Made landfall 50 km north of the Harney River (HR) transition •Will Hurricane Wilma trigger long-term vegetation change? Rainfall Oct 2005 Evapotranspiration Hurricane Wilma occurred on October 25, 2005 Groundwater mm level Groundwater Red SH5; Black SH4 ppt Groundwater salinity salinity Groundwater Empirical data reveal little effect on groundwater level and salinity – probably not enough to trigger a regime shift. Conclusions • Environmental gradient can itself cause a separation of vegetation communities by an ecotone • “Switch” (Positive feedback) increases the sharpness of the ecotone boundary • Short inhibitor pulse perturbation didn’t result in regime shift in our model. • But a long ‘press’ perturbation resulted in regime shift. • These results are a start in addressing the question of whether storm surges from hurricanes can cause regime shifts in coastal vegetation Acknowledgments • USGS FISCHS (Future Impacts of Sea Level Rise on Coastal Habitats and Species) • Department of Biology, University of Miami • Funding from – USGS Greater Everglades Priority Ecosystems Science – USGS Global Change Research & Development Program .
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