In North America, the dynamic ecotonal boundary between mangrove and salt marsh is currently fluctuating in response to freeze-free winters, which can cause rapid alterations in a number of wetland processes and attributes. Permanent plots were established in pure salt marsh habitat along the Atlantic coast of Florida in 2015, and by 2018, mangrove saplings had encroached into plots. In this study, above- and belowground biomass measurements and soil C in the top 10-cm soil profile were quantified in 2018 and compared to 2015 data to better understand the effects of mangrove encroachment on C storage in salt marsh habitat. Plant and soil fractions were tested for δ13C stable isotopic signatures to elucidate soil C sources. In 3 years, mangrove biomass increased dramatically and soil C doubled in pure salt marsh plots, consequently increasing total C in the system. Soil organic matter increased, while there was no change in soil C:N. δ13C values suggest that soil C was derived mainly from salt marsh soil organic matter, especially that of belowground, rather than aboveground biomass. These results provide real-time, quantitative data on the encroachment of mangroves into salt marshes over a relatively short period of time.
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Adame, M. F. & B. Fry, 2016. Source and stability of soil carbon in mangrove and freshwater wetlands of the Mexican Pacific coast. Wetlands Ecology and Management 24: 129–137.
Alongi, D. M., 2011. Carbon payments for mangrove conservation: ecosystem constraints and uncertainties of sequestration potential. Environmental Science & Policy 14(4): 462–470.
Alongi, D. M., 2014. Carbon cycling and storage in mangrove forests. Annual Review of Marine Science 6: 195–219.
Asner, G. P., S. Archer, R. F. Hughes, R. J. Ansley & C. A. Wessman, 2003. Net changes in regional woody vegetation cover and carbon storage in Texas drylands, 1937–1999. Global Change Biology 9(3): 316–335.
Armitage, A. R., W. E. Highfield, S. D. Brody & P. Louchouarn, 2015. The contribution of mangrove expansion to salt marsh loss on the Texas Gulf Coast. PLoS ONE 10: e0125404.
Ball, M. C., 1980. Patterns of secondary succession in a mangrove forest of southern Florida. Oecologia 44(2): 226–235.
Bertness, M. D., 1991. Zonation of Spartina patens and Spartina alterniflora in New England salt marsh. Ecology 72: 138–148.
Camilleri, J. C., 1992. Leaf-litter processing by invertebrates in a mangrove forest in Queensland. Marine Biology 114: 139–145.
Castañeda-Moya, E., R. R. Twilley, V. H. Rivera-Monroy, K. Zhang, S. E. Davis & M. Ross, 2010. Sediment and nutrient deposition associated with Hurricane Wilma in mangroves of the Florida Coastal Everglades. Estuaries and Coasts 33(1): 45–58.
Cavanaugh, K. C., J. R. Kellner, A. J. Forde, D. S. Gruner, J. D. Parker, W. Rodriguez & I. C. Feller, 2014. Poleward expansion of mangroves is a threshold response to decreased frequency of extreme cold events. Proceedings of the National Academy of Sciences 111: 723–727.
Cheng, X., Y. Luo, X. Xu, R. Sherry & Q. Zhang, 2011. Soil organic matter dynamics in a North America tallgrass prairie after 9 yr of experimental warming. Biogeosciences 8: 1487–1498.
Chmura, G. L., P. Aharon, R. A. Socki & R. Abernethy, 1987. An inventory of 13 C abundances in coastal wetlands of Louisiana, USA: vegetation and sediments. Oecologia 74(2): 264–271.
Chmura, G. L., S. C. Anisfeld, D. R. Cahoon & J. C. Lynch, 2003. Global carbon sequestration in tidal, saline wetland soils. Global Biogeochemistry Cycles 17(4): 1111–1123.
Choi, Y., Y. Wang, Y. P. Hsieh & L. Robinson, 2001. Vegetation succession and carbon sequestration in a coastal wetland in northwest Florida: evidence from carbon isotopes. Global Biogeochemical Cycles 15: 311–319.
Comeaux, R. S., M. A. Allison & T. S. Bianchi, 2012. Mangrove expansion in the Gulf of Mexico with climate change: implications for wetland health and resistance to rising seas. Estuarine, Coastal and Shelf Science 96: 81–95.
Currin, C. A., S. Y. Newell & H. W. Paerl, 1995. The role of standing dead Spartina alterniflora and benthic microalgae in salt marsh food webs: considerations based on multiple stable isotope analysis. Marine Ecology Progress Series 121: 99–116.
Dangremond, E. M. & I. C. Feller, 2016. Precocious reproduction increases at the leading edge of a mangrove range expansion. Ecology and Evolution 6: 5087–5092.
Donato, D. C., J. B. Kauffman, D. Murdiyarso, S. Kurnianto, M. Stidhman & M. Kanninen, 2011. Mangroves among the most carbon-rich forests in the tropics. Nature Geoscience 4: 293–297.
Doughty, C. L., J. A. Langley, W. S. Walker, I. C. Feller, R. Schaub & S. K. Chapman, 2016. Mangrove range expansion rapidly increases coastal wetland carbon storage. Estuaries and Coasts 39: 385–396.
Duarte, C. M., S. Agustí, P. A. Del Giorgio & J. J. Cole, 1999. Regional carbon imbalances in the oceans. Science 284: 1735.
Duarte, C. M., J. J. Middleburg & N. Caraco, 2005. Major role of marine vegetation on the oceanic carbon cycle. Biogeosciences 2: 1–8.
Duarte, C. M., I. J. Losada, I. E. Hendriks, I. Mazarrasam & N. Marba, 2013. The role of coastal plant communities for climate change mitigation and adaptation. Nature Climate Change 3: 961–968.
Ehleringer, J. R., N. Buchmann & L. B. Flanagan, 2000. Carbon isotope ratios in belowground carbon cycle processes. Ecological Applications 10: 412–422.
Feng, J., J. Zhou, L. Wang, X. Cui, C. Ning, H. Wu, X. Zhu & G. Lin, 2017. Effects of short-term invasion of Spartina alterniflora and the subsequent restoration of native mangroves on the soil organic carbon, nitrogen and phosphorus stock. Chemosphere 184: 774–783.
Florida Fish and Wildlife Conservation Commission-Fish and Wildlife Research Institute. “Salt Marshes in Florida” [vector digital data]. 1:24,000. 2009. http://geodata.myfwc.com/datasets/20ab7447d9424929bf0e7a2a633d6407_3 Accessed Nov 2015
Florida Fish and Wildlife Conservation Commission-Fish and Wildlife Research Institute. “Counties 1:24,000 Scale Polygon Florida” [vector digital data]. 1:24,000. 10067. http://geodata.myfwc.com/datasets/982d999dda774cc4a1cf0ac8908f4c92_3 Accessed Nov 2015
Guo, H., C. Weaver, S. P. Charles, A. Whitt, S. Dastidar, P. D’Odorico, J. Fuenter, J. A. Kominoski, A. R. Armitage & S. C. Pennings, 2017. Coastal regime shifts: rapid responses of coastal wetlands to changes in mangrove cover. Ecology 98: 762–772.
Haines, E. B., 1976. Relation between the stable carbon isotope composition of fiddler crabs, plants, and soils in a salt marsh 1. Limnology and Oceanography 21(6): 880–883.
Henry, K. M. & R. R. Twilley, 2013. Soil development in a coastal Louisiana wetland during a climate-induced vegetation shift from salt marsh to mangrove. Journal of Coastal Research 29: 1273–1283.
Hibbard, K. A., S. Archer, D. S. Schimel & D. W. Valentine, 2001. Biogeochemical changes accompanying woody plant encroachment in a subtropical savanna. Ecology 82: 1999–2011.
Kauffman, J. B. & D. C. Donato, 2012. Protocols for the measurement, monitoring and reporting of structure, biomass and carbon stocks in mangrove forests. Working paper 86. Center for International forestry research (CIFOR) Bogor, Indonesia.
Kelleway, J. J., N. Saintilan, P. I. Macreadie, C. G. Skilbeck, A. Zawadzki & P. J. Ralph, 2016. Seventy years of continuous encroachment substantially increases ‘blue carbon’ capacity as mangroves replace intertidal salt marshes. Global Change Biology 22: 1097–1109.
Kelleway, J. J., K. Cavanaugh, K. Rogers, I. C. Feller, E. Ens, C. Doughty & N. Saintilan, 2017. Review of the ecosystem service implications of mangrove encroachment into salt marshes. Global Change Biology 23: 3967–3983.
Kelleway, J. J., D. Mazumder, J. A. Baldock & N. Saintilan, 2018. Carbon isotope fractionation in the mangrove Avicennia marina has implications for food web and blue carbon research. Estuarine, Coastal and Shelf Science 205: 68–74.
Komiyama, J. E., S. Ong & S. Poungparn, 2008. Allometry, biomass and productivity of mangrove forests: a review. Aquatic Botany 89: 128–137.
Lewis, R. R. & F. M. Dunstan, 1975. The possible role of Spartina alterniflora Loisel. In establishment of mangroves in Florida: 82–100. In Proc. Second Annual Conference on Restoration of Coastal Vegetation in Florida Lewis, R. (ed.), Hillsborough Community College, Tampa, Florida: 203 p.
Liao, J. D., T. W. Boutton & J. D. Jastrow, 2006. Storage and dynamics of carbon and nitrogen in soil physical fractions following woody plant invasion of grassland. Soil Biology and Biochemistry 38: 3184–3196.
Lunstrum, A. & L. Chen, 2014. Soil carbon stocks and accumulation in young mangrove forests. Soil Biology and Biochemistry 75: 223–232.
Lovelock, C. E., 2008. Soil respiration and belowground carbon allocation in mangrove forests. Ecosystems 11(2): 342–354.
Lovelock, C. E., M. F. Adame, V. Bennion, M. Hayes, J. O’Mara, R. Reef & N. S. Saintilan, 2014. Contemporary rates of carbon sequestration through vertical accretion of sediments in mangrove forests and saltmarshes of South East Queensland, Australia. Estuaries and Coasts 37: 763–771.
Mateo, M. A., J. Romero, M. Pérez, M. M. Littler & D. S. Littler, 1997. Dynamics of millenary organic deposits resulting from the growth of the Mediterranean seagrass Posidonia oceanica. Estuarine Coastal and Shelf Science 44: 103–110.
McKee, K. L., I. A. Mendelssohn & M. W. Hester, 1988. Reexamination of pore water sulfide concentrations and redox potentials near the aerial roots of Rhizophora mangle and Avicennia germinans. American Journal of Botany. 75(9): 1352–1359.
McKee, K. L., D. R. Cahoon & I. C. Feller, 2007. Caribbean mangroves adjust to rising sea level through biotic controls on change in soil elevation. Global Ecology and Biogeography 16: 545–556.
McKee, K. L. & J. E. Rooth, 2008. Where temperate meets tropical: multi-factorial effects of elevated CO2, nitrogen enrichment, and competition on a mangrove-salt marsh community. Global Change Biology 14: 971–984.
Middleton, B. A. & K. L. McKee, 2001. Degradation of mangrove tissues and implications for peat formation in Belizean island forests. Journal of Ecology 89(5): 818–828.
Nilsson, C., R. L. Brown, R. Jansson & D. M. Merritt, 2010. The role of hydrochory in structuring riparian and wetland vegetation. Biological Reviews 85: 837–858.
Odum, E. P., 1966. The strategy of ecosystem development. Science 164: 262–270.
Osland, M. J., A. C. Spivak, J. A. Nestlerode, J. M. Lessmann, A. E. Almario, P. T. Heitmuller, M. J. Russell, K. W. Krauss, F. Alvarez, D. D. Dantin, J. E. Harvey, A. S. From, N. Cormier & C. L. Stagg, 2012. Ecosystem development after mangrove wetland creation: plant–soil change across a 20-year chronosequence. Ecosystems 15: 848–866.
Osland, M. J., R. H. Day, C. T. Hall, M. D. Brumfield, J. L. Dugas & W. R. Jones, 2017a. Mangrove expansion and contraction at a poleward range limit: climate extremes and land-ocean temperature gradients. Ecology 98: 125–137.
Osland, M. J., L. C. Feher, K. T. Griffith, K. C. Cavanaugh, N. M. Enwright, R. H. Day, C. L. Stagg, K. W. Krauss, R. J. Howard, J. B. Grace & K. Rogers, 2017b. Climatic controls on the global distribution, abundance, and species richness of mangrove forests. Ecological Monographs 87: 341–359.
Ouyang, X., S. Y. Lee & R. M. Connolly, 2017. The role of root decomposition in global mangrove and saltmarsh carbon budgets. Earth-Science Reviews 166: 53–63.
Palomo, L. & F. X. Niell, 2009. Primary production and nutrient budgets of Sarcocornia perennis ssp. alpini (Lag.) Castroviejo in the salt marsh of the Palmones River estuary (Southern Spain). Aquatic Botany 91: 130–136.
Perry, C. L. & I. A. Mendelssohn, 2009. Ecosystem effects of expanding populations of Avicennia germinans in a Louisiana salt marsh. Wetlands 29: 396–406.
Peterson, J. M. & S. S. Bell, 2012. Tidal events and salt-marsh structure influence black mangrove (Avicennia germinans) recruitment across an ecotone. Ecology 93: 1648–1658.
Peterson, J. M. & S. S. Bell, 2015. Saltmarsh boundary modulates dispersal of mangrove propagules: implications for mangrove migration with sea-level rise. PLoS ONE 10: e0119128.
Pickens, C. N. & 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.
Poret, N., R. R. Twilley, V. H. Rivera-Monroy & C. Coronado-Molina, 2007. Belowground decomposition of mangrove roots in Florida coastal Everglades. Estuaries and Coasts 30(3): 491–496.
Rodriguez, W., I. C. Feller & K. C. Cavanaugh, 2016. Spatio-temporal changes of a mangrove–saltmarsh ecotone in the northeastern coast of Florida, USA. Global Ecology and Conservation 7: 245–261.
Ross, M. S., J. F. Meeder, J. P. Sah, P. L. Ruiz & G. J. Telesnicki, 2000. The southeast saline Everglades revisited: 50 years of coastal vegetation change. Journal of Vegetation Science 11: 101–112.
Ross, M. S., P. L. Ruiz, J. P. Sah, D. L. Reed, J. Walters & J. F. Meeder, 2006. Early post-hurricane stand development in fringe mangrove forests of contrasting productivity. Plant Ecology 185(2): 283–297.
Saintilan, N., K. Rogers, D. Mazumder & C. Woodroffe, 2013. Allochthonous and autochthonous contributions to carbon accumulation and carbon store in southeastern Australian coastal wetlands. Estuarine, Coastal and Shelf Science 128: 84–92.
Scharenbroch, B. C., M. L. Flores-Mangual, B. Lepore, J. G. Bockheim & B. Lowery, 2010. Tree encroachment impacts carbon dynamics in a sand prairie in Wisconsin. Soil Science Society of America Journal 74(3): 956–968.
Shafer, D. J. & T. H. Roberts, 2008. Long-term development of tidal mitigation wetlands in Florida. Wetlands Ecology and Management 16(1): 23–31.
Sherrod, C. L. & C. McMillan, 1985. The distributional history and ecology of mangrove vegetation along the northern Gulf of Mexico coastal region.
Simpson, L. T., T. Z. Osborne, L. J. Duckett & I. C. Feller, 2017. Carbon Storages along a climate induced coastal wetland gradient. Wetlands 37: 1–13.
Smith, B. N. & S. Epstein, 1971. Two categories of 13C/12C ratios for higher plants. Plant physiology 47(3): 380–384.
Stevens, P. W., S. L. Fox & C. L. Montague, 2006. The interplay between mangroves and saltmarshes at the transition between temperate and subtropical climate in Florida. Wetlands Ecology and Management 14: 435–444.
Valiela, I., J. M. Teal, S. D. Allen, R. Van Etten, D. Goehringer & S. Volkmann, 1985. Decomposition in salt marsh ecosystems: the phases and major factors affecting disappearance of above-ground organic matter. Journal of Experimental Marine Biology and Ecology 89(1): 29–54.
Weiss, C., J. Weiss, J. Boy, I. Iskandar, R. Mikutta & G. Guggenberger, 2016. Soil organic carbon stocks in estuarine and marine mangrove ecosystems are driven by nutrient colimitation of P and N. Ecology and Evolution 6: 5043–5056.
Wooller, M., B. Smallwood, M. Jacobson & M. Fogel, 2003. Carbon and nitrogen stable isotopic variation in Laguncularia racemosa (L.)(white mangrove) from Florida and Belize: implications for trophic level studies. Hydrobiologia 499: 13–23.
This research was funded by the National Aeronautics and Space Administration (NASA) Climate and Biological Response program (NNX11AO94G) and the National Science Foundation (NSF) MacroSystems Biology program (EF1065821). The authors would like to thank Florida State Parks, the Merritt Island National Wildlife Refuge, Guana-Tolmato-Matanzas National Estuarine Research Reserve, and Canaveral National Seashore for permits and unabridged access to their parks. We also thank L.J. Duckett, M.L. Lehmann, K.V. Curtis, and Z.R. Foltz for field and lab assistance. We sincerely thank the two anonymous reviewers for their edits and suggestions, which significantly improved this manuscript.
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Simpson, L.T., Stein, C.M., Osborne, T.Z. et al. Mangroves dramatically increase carbon storage after 3 years of encroachment. Hydrobiologia 834, 13–26 (2019). https://doi.org/10.1007/s10750-019-3905-z