Abstract
Mosaic freshwater landscapes exhibit tree-dominated patches —or tree islands—interspersed in a background of marshes and wet prairies. In the Florida Everglades, these patterned landscapes provide habitat for a variety of plant and animal species and are hotspots of biodiversity. Even though the emergence of patchy freshwater systems has been associated with climate histories, fluctuating hydrologic conditions, and internal feedbacks, a process-based quantitative understanding of the underlying dynamics is still missing. Here, we develop a mechanistic framework that relates the dynamics of vegetation, nutrients and soil accretion/loss through ecogeomorphic feedbacks and interactions with hydrologic drivers. We show that the stable coexistence of tree islands and marshes results as an effect of their both being (meta-) stable states of the system. However, tree islands are found to have only a limited resilience, in that changes in hydrologic conditions or vegetation cover may cause an abrupt shift to a stable marsh state. The inherent non-linear and discontinuous dynamics determining the stability and resilience of tree islands should be accounted for in efforts aiming at the management, conservation and restoration of these features.
Similar content being viewed by others
References
Anderies JM, Janssen MA, Walker BH. 2002. Grazing, management, resilience and the dynamics of fire-driven rangeland system. Ecosystems 5:23–44.
Armentano TV. 1980. Drainage of organic soils as a factor in the world carbon cycle. Bioscience 30(12):825–30.
Armentano TV, Jones DT, Ross MS, Gamble BW. 2002. Vegetation pattern and process in tree islands of the southern Everglades and adjacent areas. In: Sklar FH, van der Valk A, Eds. Tree islands of the everglades. Dordrecht: Kluwer. p 225–81.
Borgogno F, D’Odorico P, Laio F, Ridolfi L. 2009. Mathematical models of vegetation pattern formation in Ecohydrology. Rev Geophys 47:RG1005. doi:10.1029/2007RG000256.
Brandt LA, Silveira JE, Kitchens WM. 2002. Tree islands of the Arthur R. Marshall Loxahatchee National Wildlife Refuge. In: Sklar FH, Valk Avd, Eds. Tree Islands of the Everglades. Dordrecht: Kluwer Academic Publishers. p 311–35.
Brown S, Gillespie AJR, Lugo AE. 1989. Biomass estimation methods for tropical forests with applications to forest inventory data. For Sci 35(4):881–902.
Charley JL, West NE. 1975. Plant-induced soil chemical patterns in some shrub-dominated semi-desert ecosystems of Utah. J Ecol 63(3):945–63.
Craighead FC. 1971. The trees of south Florida. Volume 1: the natural environments and their succession, University of Miami Press, Coral Gables, FL., 212 pp.
Davis SM, Gunderson LH, Park WA, Richardson JR, Mattson JE. 1994. Landscape dimension, composition, and function in a changing Everglades ecosystem. In: Davis SM, Ogden JC, Eds. Everglades: the ecosystem and its restoration. Delray Beach (FL): St. Lucie Press. p 419–44.
DeLonge M, D’Odorico P, Lawrence D. 2008. Feedbacks between phosphorous deposition and canopy cover: the emergence of multiple states in dry tropical forests. Glob Change Biol 14(1):154–60. doi:10.1111/j.1365-2486.2007.01470.x.
D’Odorico P, Laio F, Ridolfi L. 2006. A probabilistic analysis of fire-induced tree-grass coexistence in savannas. Am Nat 167(3):E79–87.
Dougill AJ, Thomas AD. 2002. Nebkha dunes in the Molopo Basin, South Africa and Botswana: formation, controls and their validity as indicators of soil degradation. J Arid Environ 50:413–28.
Dublin HT, Sinclair ARE, McGlade J. 1990. Elephants and fire as causes of multiple stable states in the Serengeti-Mara woodlands. J Anim Ecol 59:1147–64.
Felker P, Diaz-De Leon V. 2005. An improved tool for the fabrication of dendrometerbands to estimate growth as function of treatments in slow growing native Prosopis stands. For Ecol Manag 209:353–6.
Frederick PC, Powell GVN. 1994. Nutrient transport by wading birds in the Everglades. In: Davis SM, Ogden JC, Eds. Everglades: the ecosystem and its restoration. Delray Beach (FL): St. Lucie Press.
Givnish TJ, Volin JC, Owen VD, Volin VC, Muss JD, Glaser PH. 2008. Vegetation differentiation in the patterned landscape of the central Everglades: importance of local and landscape drivers. Global Ecol Biogeogr 17:384–402.
Glaser PH. 1987. The Ecology of Patterned Boreal Peatlands of Northern Minnesota: a Community Profile. U.S. Fish and Wildlife, Serv. Rep., Report 85 (7.14), Washington, DC.
Glaser PH. 1992. Raised bogs in eastern North America–Regional controls for species richness and floristic assemblages. J Ecol 80:535–54.
Graf M-T, Schwadron M, Stone PA, Ross M, Chmura GL. 2008. An enigmatic carbonate layer in Everglades tree island peats. EOS 89(12):117–18.
Hagerthey SE, Newman S, Rutchey K, Smith EP, Godin J. 2008. Multiple regime shifts in a subtropical peatland: community-specific thresholds to eutrophication. Ecol Monogr 78:547–65.
Kwon H-H, Lall U, Moon Y-I, Khalil AF, Ahn H. 2006. Episodic interannual climate oscillations and their influence on seasonal rainfall in the Everglades National Park. Water Resour Res 42:W11404. doi:10.1029/2006WR005017.
Khalaf FI, Misak R, Al-Dousari A. 1995. Sedimentological and morphological characteristics of some nabkha deposits in the northern coastal plain of Kuwait, Arabia. J Arid Environ 29(3):267–292, ISSN 0140-1963.
Lago ME, Miralles-Wilhelm F, Mahmoudi M, Engel V. 2010. Numerical modeling of the effects of water flow, sediment transport and vegetation growth on the spatiotemporal patterning of the ridge and slough landscape of the Everglades wetland. Adv Water Res. doi:10.1016/j.advwatres.2010.07.009.
Larsen LG, Harvey JW, Crimaldi JP. 2007. A delicate balance: ecohydrological feedbacks governing landscape morphology in a lotic peatland. Ecol Monogr 77:591–614.
Larsen LG, Harvey JW. 2010. Modeling of hydroecological feedbacks predicts distinct classes of landscape pattern, process, and restoration potential in shallow aquatic ecosystems. Geomorphology. doi:10.1016/j.geomorph.2010.03.015.
Lawrence D, D’Odorico P, Diekmann L, DeLonge M, Das R, Eaton J. 20701. 2007. Ecological feedbacks following deforestation create the potential for a catastrophic ecosystem shift in tropical dry forest. Proc Natl Acad Sci USA PNAS 104(52):52:20696–20701.
Luken JO, Billings WD. 1985. The influence of microtopographic heterogeneity on carbon dioxide efflux from a subarctic bog. Holarctic Ecol 8:306–12.
Jones DT, Sah JP, Ross MS, Oberbauer SF, Hwang B, Jayachandran K. 2006. Response of twelve tree species common in Everglades tree islands to simulated hydrologic regimes. Wetlands 26(3):830–44.
Macek P, Rejmankova E, Fuchs R. 2009. Biological activities as patchiness driving forces in wetlands of northern Belize. Oikos 118:1687–94.
Marani M, D’Alpaos A, Lanzoni S, Carniello L, Rinaldo A. 2007. Biologically-controlled multiple equilibria of tidal landforms and the fate of the Venice lagoon. Geophys Res Lett 34:L11402. doi:10.1029/2007GL030178.
McCarthy TS, Ellery WN. 1994. The effect of vegetation on soil and ground water chemistry and hydrology of islands in the seasonal swamps of the Okavango fan Botswana. J Hydrol 154:169–93.
McCarthy TS. 2006. Groundwater in the wetlands of the Okavango Delta, Botswana, and its contribution to the structure and function of the ecosystem. J Hydrol 320(3–4):264–82.
Mitsch WJ, Gosselink JG. 2000. Wetlands. New York: Wiley.
Moore TR, Knowles R. 1989. The influence of water-table levels on methane and carbon-dioxide emissions from peatland soils. Can J Sci 69(1):33–8.
Naiman R, Decamps H. 1997. The ecology of interfaces: Riparian zones. Annu Rev Ecol Syst 28:621–58.
Nickling WG, Wolfe SA. 1994. The morphology and origin of Nabkhas, Region of Mopti, Mali, West Africa. J Arid Environ 28:13–30.
Noy-Meir I. 1975. Stability of grazing systems: an application of predator-prey graphs. J Ecol 63:459–81.
Orem WH, Willard DA, Lerch HE, Bates AL, Boyland A, Comm M. 2002. Nutrient geochemistry of sediments from two tree islands in Water Conservation Area #B, the Everglades, Florida. In: Sklar FH, van der Valk AG, Eds. Tree islands of the Everglades. Dordrecht: Kluwer Academic Publishers. p 153–86.
Prance GT, Schaller GB. 1982. Preliminary study of some vegetation types of the Pantanal, Mato Grosso, Brazil. Brittonia 34:228–51.
Ravi S, D’Odorico P, Okin GS. 2007. Hydrologic and aeolian controls on vegetation patterns in arid landscapes. Geophys Res Lett 34:L24S23. doi:10.1029/2007GL031023.
Raich JW, Schlesinger WH. 1992. The global carbon dioxide flux in soil respiration and its relationship to vegetation and climate. Tellus B 44(2):81–99.
Richardson CJ. 2009. The Everglades: North America’s subtropical wetland. Wetlands Ecol Manage. doi:10.1007/s11273-009-9156-4.
Richardson CJ. 2000. Freshwater wetlands. In: Barbour MG, Billings WD, Eds. North American terrestrial vegetation. Cambridge: Cambridge University Press. p 449–98.
Ridolfi L, D’Odorico P, Laio F. 2006. Effect of vegetation-water table feedbacks on the stability and resilience of plant ecosystems. Water Resour Res 42:W01201. doi:10.1029/2005WR004444.
Ridolfi L, Laio F, D’Odorico P. 2008. Fertility island formation and evolution in dryland ecosystems. Ecol Soc 13(1):5.
Rietkerk M, Dekker SC, Wassen MJ, Verkroost AWM, Bierkens MFP. 2004. A putative mechanism for bog patterning. Am Nat 163(5):699–708.
Ross MS, Mitchell-Bruker S, Sah JP, Stothoff S, Ruiz PL, Reed DL, Jayachandran K, Coultas CL. 2006. Interaction of hydrology and nutrient limitation in the ridge and slough landscape of the southern Everglades. Hydrobiologia 569:37–59.
Sah JP. 2004. Vegetation structure and composition in relation to the hydrological and soil environments in tree islands of Shark Slough. Chapter 6. In: Ross MS, Jones DT, Eds. Tree Islands in the Shark Slough Landscape: interactions of vegetation, hydrology and soils. Final Report submitted to Everglades National Park, U.S. Department of the Interior, National Park Service.
Sarmiento G. 1984. The Ecology of Neotropical Savannas. Cambridge (MA): Harvard University Press.
Scheffer M, Carpenter S, Foley JA, Folke C, Walker BH. 2001. Catastrophic shifts in ecosystems. Nature 413:591–6.
Schlesinger WH, Reynolds JF, Cunnigham GL, Huenneke LF, Jarrell WM, Virginia RA, Whitford WG. 1990. Biological feedbacks in global desertification. Science 147:1043–8.
Scholes RJ, Archer SR. 1997. Tree-grass interactions in savannas. Ann Rev Ecol Syst 28:517–44.
Scholes RJ, Walker BH. 1993. An African Savanna. Cambridge: Cambridge University Press.
Science Coordination Team (SCT). 2003. The role of flow in the everglades ridge and slough landscape, South Florida Ecosystem Restoration Working Group, 62 pp.
Shachak M, Boeken B, Groner E, Kadmon R, Lubin Y, Meron E, Ne’Eman G, Perevolotsky A, Shkedy Y, Ungar ED. 2008. Woody species as landscape modulators and their effects on biodiversity patterns. Bioscience 58:209–21.
Sklar FH. 2001. In: Kloor K, Eds. Forgotten Islands, Audubon Magazine, July–August.
Sklar FH, van der Valk A, Eds. 2002. Tree islands of the Everglades. Dordrecht: Kluwer Academic Publishers. p 541.
Tomassen HBM, Smolders AJP, Lamers LPM, Roelofs JGM. 2005. How bird droppings can affect the vegetation composition of ombrotrophic bogs. Can J Bot 83:1046–56.
Troxler TG, Childers DL. 2009. Litter decomposition promotes differential feedbacks in an oligotrophic southern Everglades wetland. Plant Ecol 200:69–82.
Van der Valk AG, Warner BG. 2009. The development of patterned mosaic landscapes: an overview. Plant Ecol 200:1–7.
Vetaas OR. 1992. Micro-site effects of trees and shrubs in dry savannas. J Veg Sci 3:337–44.
Wang L, D’Odorico P, Macko S, Ringrose S, Coetzee S. 2007. Biogeochemistry of Kalahari sands. J Arid Environ 71:259–79.
Walker BH, Ludwig D, Holling CS, Peterman RM. 1981. Stability of semiarid savanna grazing systems. J Ecol 69:473–98.
Walker BH, Noy-Meir I. 1982. Aspects of stability and resilience of savanna ecosystems. In: Walker BH, Huntley B, Eds. Ecology of Subtropical Savannas. Berlin: Springer. p 556–90.
Walter H. 1971. Ecology of tropical and subtropical vegetation. Edinburgh: Oliver and Boyd.
Watts DL, Cohen MJ, Heffernan JB, Osborne TZ. 2010. Hydrologic Modification and the Loss of Self-organized Patterning in the Ridge–Slough Mosaic of the Everglades. Ecosystems 13(6):813–27. doi:10.1007/s10021-010-9356-z.
Wetzel PR. 2002. Analysis of tree island vegetation communities. In: Sklar FH, van der Valk A, Eds. Tree Islands of the Everglades. Dordrecht: Kluwer Academic Publishers. p 357–89.
Wetzel PR, van der Valk A, Newman S, Gawlik DE, Troxler-Gann TG, Coronado-Molina CA et al. 2005. Maintaining tree islands in the Florida Everglades: nutrient redistribution is the key. Front Ecol Environ 3:370–6.
Wetzel PR, van der Valk AG, Newman S, Coronado CA, Troxler-Gann TG, Childers DL, Orem WH, Sklar FH. 2009. Heterogeneity of phosphorus distribution in a patterned landscape, the Florida Everglades. Plant Ecol 200:83–90.
Willard DA, Bernhardt CE, Holmes CW, Landacre B, Marot M. 2006. Response of Everglades Tree Islands to environmental change. Ecol Monogr 76(4):565–83.
Wilson JB, Agnew ADQ. 1992. Positive-feedback switches in plant communities. Adv Ecol Res 23:263–336.
Acknowledgements
Support from the National Park Service (Everglades National Park #H5284080004) is gratefully acknowledged. This manuscript has greatly benefited from comments provided by Dr. Laurel G. Larsen and Dr. Judson W. Harvey, an anonymous reviewer, and the subject editor, Dr. Donald DeAngelis.
Author information
Authors and Affiliations
Corresponding author
Additional information
Author Contributions
PD-Conceived and designed study, performed research, contributed new models, wrote the article. VE-Conceived and designed study, performed research, analyzed data, wrote the article. JC-Conceived and designed study, performed research, contributed new models. SO-Performed research, analyzed data. MR-Performed research, analyzed data. JS-Performed research, analyzed data.
Rights and permissions
About this article
Cite this article
D’Odorico, P., Engel, V., Carr, J.A. et al. Tree–Grass Coexistence in the Everglades Freshwater System. Ecosystems 14, 298–310 (2011). https://doi.org/10.1007/s10021-011-9412-3
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10021-011-9412-3