Abstract
Assimilation wetlands are natural, non-constructed, wetlands that are used for the removal of nutrients from treated municipal wastewater. This passive process is comparatively less expensive than other conventional forms of tertiary treatment of wastewater, making it desirable for municipalities. Assimilation wetlands are monitored for a number of environmental parameters, yet limited research has been conducted to understand the ecological impact of this water treatment process. Studies from a variety of systems throughout the United States provide conflicting evidence of the responses of wetland ecosystems to increased inundation and nutrient enrichment. Through an extensive review of existing literature, we summarize the impacts of increasing nutrient loading and inundation on receiving wetlands. Importantly, we address current research gaps and identify directions for future scientific study on this topic. Comprehensive ecosystem monitoring conducted at larger spatial and temporal scales, as well as controlled experimentation, are needed to fully understand ecosystem responses to long-term use of wetlands to remediate wastewater nutrients. Our intent is neither to promote nor detract from this process, but rather to bring attention to potential drivers of environmental change and inform those who manage these systems.
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References
Alldred M, Liberti A, Baines SB (2017) Impact of salinity and nutrients on salt marsh stability. Ecosphere 8(11):e02010. https://doi.org/10.1002/ecs2.2010
Alt DC (2019) An airlifted tidal mesocosm for oil degradation studies. LSU Doctoral Dissertation, p 4797. https://digitalcommons.lsu.edu/gradschool_dissertations/4797. Accessed 01 Feb 2021
Archer TL, Onken AB, Matheson RL, Bynum ED Jr (1982) Nitrogen fertilizer influence on greenbug (Homoptera: Aphididae) dynamics and damage to sorghum. J Econ Entomol 75:695–698. https://doi.org/10.1093/jee/75.4.695
Baldwin DS, Mitchell AM (2000) The effects of drying and re-flooding on the sediment and soil nutrient dynamics of lowland river-floodplain systems: a synthesis. River Res Appl 16:457–467. https://doi.org/10.1002/1099-1646
Bastviken SK, Weisner SE, Thiere G, Svensson JM, Ehde PM, Tonderski KS (2009) Effects of vegetation and hydraulic load on seasonal nitrate removal in treatment wetlands. Ecol Eng 35(5):946–952. https://doi.org/10.1016/j.ecoleng.2009.01.001
Battle JM, Mihuc TB (2000) Decomposition dynamics of aquatic macrophytes in the lower Atchafalaya, a large floodplain river. Hydrobiologia 418:123–136. https://doi.org/10.1016/j.aquabot.2015.08.001
Bernal B, Mitsch WJ (2011) Comparing carbon sequestration in temperate freshwater wetland communities. Global Change Biol 19:1636–1647. https://doi.org/10.1111/j.1365-2486.2011.02619.x
Bodker JE, Turner RE, Tweel A, Schulz C, Swarzenski C (2015) Nutrient-enhanced decomposition of plant biomass in a freshwater wetland. Aquatic Botany 127:44–52. https://doi.org/10.1016/j.aquabot.2015.08.001
Brantley CG, Day JW Jr, Lane RR, Hyfield E, Day JN, Ko JY (2008) Primary production, nutrient dynamics, and accretion of a coastal freshwater forested wetland assimilation system in Louisiana. Ecol Eng 34:7–22
Breitburg D, Levin LA, Oschlies A, Grégoire M, Chavez FP, Conley DJ, Garçon V, Gilbert D, Gutiérrez D, Isensee K, Jacinto GS, Limburg KE, Montes I, Naqvi SWA, Pitcher GC, Rabalais NN, Roman MR, Rose KA, Seibel BA, Telszewski M, Yasuhara M, Zhang J (2018) Ocean deoxygenation – causes and consequences in a changing world. Science 359:eaam7240. https://doi.org/10.1126/science.aam7240
Brevik EC, Homburg JA (2004) A 5000 year record of carbon sequestration from a coastal lagoon and wetland complex, Southern California, USA. Catena 57:221–232. https://doi.org/10.1016/j.catena.2003.12.001
Brock TCM, Boon JJ, Paffen BGP (1985) The effects of the season and of the water chemistry on the decomposition of Nymphaea alba L.; weight loss and pyrolysis spectrometry of the particulate matter. Aquatic Botany 21:197–229. https://doi.org/10.1016/0304-3770(85)90001-4
Bulseco AN, Giblin AE, Tucker J, Murphy AE, Sanderman J, Hiller-Bittrolff K, Bowen JL (2019) Nitrate addition stimulates microbial decomposition of organic matter in salt marsh sediments. Glob. Change Biol. 25:3224–3241. https://doi.org/10.1111/gcb.14726
Cahoon DR, Hensel P, Rybczyk J, McKee KL, Proffitt CE, Perez B (2003) Mass tree mortality leads to mangrove peat collapse at Bay Islands, Honduras after hurricane Mitch. Journal of Ecology 91:1093–1105. https://doi.org/10.1046/j.1365-2745.2003.00841.x
Callaway JC, Borgnis EL, Turner RE, Milan CS (2012) Carbon sequestration and sediment accretion in San Francisco Bay tidal wetlands. Estuaries and Coasts 35:1163–1181. https://doi.org/10.1007/s12237-012-9508-9
Carpenter SR, Lodge DM (1986) Effects of submersed macrophytes on ecosystem processes. Aquatic Botany 26:341–376. https://doi.org/10.1016/0304-3770(86)90031-8
Carter MR, Burns LA, Cavinder TR, Dugger KR, Fore PL, Hicks DB et al (1973) Ecosystems Analysis of the Big Cypress Swamp and Estuaries. U.S. Environmental Protection Agency, Region IV. EPA, Atlanta, Georgia 904/0-74-002
Castelle AJ, Conolly C, Emers M, Metz ED, Meyer S, Witter M (1992) Wetland buffers: an annotated bibliography. U.S. Department of Commerce NOAA. Charleston, SC. Publication No. 92-11. Washington State Department of Ecology, Shorelands and Coastal Zone Management Program, Olympia
Chanut PCM, Siebers AR, Robinson CT (2019) Flood disturbance affects macroinvertebrate food chain length in an alluvial river floodplain. Freshwater Biol 65:490–501. https://doi.org/10.1111/fwb.13445
Chatzakis M, Lyrintzis A, Mara D, Angelakis A (2006) Sedimentation tanks through the ages. Presented at the IWA 1st International symposium on water and wastewater technologies in ancient civilizations, Iraklio. IWA, Greece, pp 75–78 http://www.a-angelakis.gr/files/4%20FR79.pdf. Accessed 01 Feb 2021
Chmura GL, Anisfeld SC, Cahoon DR, Lynch JC (2003) Global carbon sequestration in tidal, saline wetland soils. Global Biogeochemical Cycles 17(4). https://doi.org/10.1029/2002GB001917
Conner WH, Brody M (1989) Rising water levels and the future of southeastern Louisiana swamps. Estuaries 12:318–323. https://doi.org/10.2307/1351909
Conner WH, Day JW Jr (1988) Rising water levels in coastal Louisiana: implications for two forested wetland areas in Louisiana. J Coastal Res 4:589–596. https://www.jstor.org/stable/4297461. Accessed 01 Feb 2021
Conner WH, Duberstein JA, Day JW Jr, Hutchinson S (2014) Impacts of changing hydrology and hurricanes on forest structure and growth along a flooding/elevation gradient in a South Louisiana forested wetland from 1986 to 2009. Wetlands 34:803–814. https://doi.org/10.1007/s13157-014-0543-0
Conner WH, McLeod KW, McCarron JK (1997) Flooding and salinity effects on growth and survival of four common forested wetland species. Wetlands Ecol Management 5:99–109. https://doi.org/10.1023/A:1008251127131
Coveney M, Stites D, Lowe E, Battoe L, Conrow R (2002) Nutrient removal from eutrophic lake water by wetland filtration. Ecological Engineering 19:141–159. https://doi.org/10.1016/S0925-8574(02)00037-X
Craft CB (1996) Dynamics of nitrogen and phosphorus retention during wetland ecosystem succession. Wetlands Ecol Manage 4(3):177–187. https://doi.org/10.1007/BF01879236
Craft CB, Richardson CJ (1998) Results of long-term organic soil accretion and nutrient accumulation in the Everglades. Soil Sci Soc Am J 62:834–843
Darby FA, Turner RE (2008) Below-and aboveground biomass of Spartina alterniflora: response to nutrient addition in a Louisiana salt marsh. Estuaries Coasts 31(2):326–334. https://doi.org/10.1007/s12237-008-9037-8
Davis JM, Rosemond AD, Eggert SL, Cross WF, Wallace JB (2010) Long-term nutrient enrichment decouples predator and prey production. PNAS 107:121–126.
Day JW Jr, Hunter RG, Lane RR, Shaffer GP, Day JN (2019a) Long-term assimilation wetlands in coastal Louisiana: review of monitoring data and management. Ecol Eng 137:7–20. https://doi.org/10.1016/j.ecoleng.2018.09.019
Day JW Jr, Ko JY, Rybczyk J, Sabins D, Bean R, Berthelot G, Brantley C, Cardoch L, Conner W, Day JN, Englande AJ, Feagley S, Hyfield E, Lane R, Lindsey J, Mistich J, Reyes E, Twilley R (2004) The use of wetlands in the Mississippi Delta for wastewater assimilation: a review. Ocean Coastal Manage 47:671–691. https://doi.org/10.1016/j.ocecoaman2004.12.007
Day JW Jr, Lane RR, Hunter RG, Shaffer GP (2019b) Response to: Turner, RE, JE Bodker, and C. Schulz. 2017. The belowground intersection of nutrients and buoyancy in a freshwater marsh. Wetlands Ecology & Management: 1–9. Wetlands Ecol Manage 27:75–85
Day JW Jr, Wetphal A, Pratt R, Hyfield E, Rybczyk J, Kemp GP, Day JN, Marx B (2006) Effects of long-term municipal effluent discharge on the nutrient dynamics, productivity, and benthic community structure of a tidal freshwater forested wetland in Louisiana. Ecol Eng 27:242–257. https://doi.org/10.1016/j.ecoleng.2006.03.004
Deegan LA, Johnson DS, Warren RS, Peterson BJ, Fleeger JW, Fagherazzi S, Wollheim WM (2012) Coastal eutrophication as a driver of salt marsh loss. Nature Letter 490:388–392. https://doi.org/10.1038/nature11533
DeLaune RD, Reddy CN, Patrick WH (1981) Accumulation of plant nutrients and heavy metals through sedimentation processes and accretion in a Louisiana salt marsh. Estuaries 4:328–334. https://doi.org/10.2307/1352157
Diaz RJ, Rosenberg R (2008) Spreading dead zones and consequences for marine ecosystems. Science 321:926–929. https://doi.org/10.1126/science.1156401
Dixon RK, Krankina ON (1995) Can the terrestrial biosphere be managed to conserve and sequester carbon? In carbon sequestration in the biosphere. Springer, Berlin, Heidelberg, pp 153–179. https://doi.org/10.1007/978-3-642-79943-3_9
Drake DC, Peterson BJ, Galván KA, Deegan LA, Fleeger JW, Hopkinson C, Johnson JM, Koop-Jakobsen K, Lemay LE, Miller EE, Picard C, Warren RS (2009) Salt marsh ecosystem biogeochemical responses to nutrient enrichment: a paired 15N tracer study. Ecology 90:2535–2546. https://doi.org/10.1890/08-1051.1
DuBarry AP (1963) Germination of bottomland tree seed while immersed in water. J Forestry 61:225–226
Fisher J, Acreman M (2004) Wetland nutrient removal: a review of the evidence. Hydrol Earth Syst Sci Discuss 8:673–685. https://hal.archives-ouvertes.fr/hal-00304953/. Accessed 01 Feb 2021
Godshalk GL, Barko JW (1985) Vegetative succession and decomposition in reservoirs. In: Gunnison, D. (Ed.), Microbial processes in Reserviors. 27: 59–77 https://doi.org/10.1007/978-94-009-5514-1_4
Hammer DA (ed) (1989) Constructed wetlands for wastewater treatment: municipal, industrial and agricultural. CRC Press, Boca Raton
Harms WR, Schreuder HT, Hook DD, Brown CL, Shropshire FW (1980) The effects of flooding on the swamp forest in Lake Ochlawaha, Florida. Ecology 61:1412–1421. https://doi.org/10.2307/1939050
Hartman P, Cleland J (2007) Wastewater treatment performance and cost data to support an affordability analysis for water quality standards. Prepared for the Montana Department of Environmental Quality, Helena, Montana, p 27. http://www.kysq.org/docs/Wastewater_2007.pdf. Accessed 01 Feb 2021
Heisler J, Glibert PM, Burkholder JM, Anderson DM, Cochlan W, Dennison WC, Dortch Q, Gobler CJ, Heil CA, Humphries E, Lewitus A, Magnien R, Marshall HG, Sellner K, Stockwell DA, Stoecker DK, Suddleson M (2008) Eutrophication and harmful algal blooms: a scientific consensus. Harmful Algae 8(1):3–13. https://doi.org/10.1016/j.hal.2008.08.006
Herbert ER, Schubauer-Berigan JP, Craft CB (2020) Effects of 10 yr of nitrogen and phosphorus fertilization on carbon and nutrient cycling in a tidal freshwater marsh. Limnol Oceanography 65:1669–1687. https://doi.org/10.1002/lno.11411
Hesse ID, Day JW Jr, Doyle TW (1998) Long-term growth enhancement of baldcypress (Taxodium distichum) from municipal wastewater application. Environ Manage 22:119–127
Hijnen WAM, Beerendonk EF, Medema GJ (2006) Inactivation credit of UV radiation for viruses, bacteria and protozoan (oo) cysts in water: a review. Water Res 40:3–22. https://doi.org/10.1016/j.watres.2005.10.030
Hillmann ER, Shaffer GP, Wood WB, Day JW Jr, Day J, Mancuso J, Lane RR, Hunter RG (2019) Above-and belowground response of baldcypress and water tupelo seedlings to variable rates of nitrogen loading: mesocosm and field studies. Ecol Eng 137:1–6
Hough BK (1957) Basic soil engineering. Ronald Press Co, New York
Hulot FD, Lacroix G, Lescher-Mautoué F, Loreau M (2000) Functional diversity governs ecosystem response to nutrient enrichment. Nature 405:340–344
Hunter RG, Day JW Jr, Lane RR, Lindsey J, Day JN, Hunter MG (2009a) Impacts of secondarily treated municipal effluent on a freshwater forested wetland after 60 years of discharge. Wetlands 29:363–371
Hunter RG, Lane RR, Day JW Jr, Lindsey J, Hunter MG (2009b) Nutrient removal and loading rate analysis of Louisiana forested wetlands assimilating treated municipal effluent. Environ Manage 44:865–873
Hunter RG, Day JW Jr, Lane RR, Shaffer GP, Day JN, Conner WH et al (2018) Chapter 2: Using natural wetlands for municipal effluent assimilation: a half-century of experience for the Mississippi River Delta and surrounding environs. In: Nagabhatla N, Metcalfe CD (eds) Multifunctional Wetlands, Environmental Contamination Remediation and Management. Springer International Publishing, p 2018. https://doi.org/10.1007/978-3-319-67416-2_2
Hunter RG, Day JW Jr, Wiegman AR, Lane RR (2019) Municipal wastewater treatment costs with an emphasis on assimilation wetlands in the Louisiana coastal zone. Ecological Engineering 137:21–25. https://doi.org/10.1016/j.ecoleng.2018.09.020
Ialeggio JS, Nyman JA (2014) Nutria grazing preference as a function of fertilization. Wetlands 34:1039–1045. https://doi.org/10.1007/s13157-014-0557-7
Isbell F, Reich PB, Tilman D, Hobbie SE, Polasky S, Binder S (2013) Nutrient enrichment, biodiversity loss, and consequent declines in ecosystem productivity. PNAS 110:11911–11916
Jones SF, Stagg CL, Krauss KW, Hester MW (2018) Flooding alters plant-mediated carbon cycling independently of elevated atmospheric CO2 concentrations. J Geophys Res Biogeosci 123:1976–1987. https://doi.org/10.1029/2017JG004369
Kadlec RH, Bevis FB (2009) Wastewater treatment at the Houghton Lake wetland: vegetation response. Ecological Engineering 35:1312–1332. https://doi.org/10.1016/j.ecoleng.2008.11.001
Kadlec RH, Knight R (1996) Treatment wetlands, 1st edn. CRC Press, Inc., Boca Raton, Florida
Kadlec RH, Wallace SD (2009) Treatment wetlands, 2nd edn. CRC Press, Boca Raton, p 112
Kasprzyk-Hordern B, Dinsdale RM, Guwy AJ (2009) The removal of pharmaceuticals, personal care products, endocrine disruptors and illicit drugs during wastewater treatment and its impact on the quality of receiving waters. Water Research 43(2):363–380. https://doi.org/10.1016/j.watres.2008.10.047
Kayranli B, Scholz M, Mustafa A, Hedmark A (2010) Carbon storage and fluxes within freshwater wetlands: a critical review. Wetlands 30:111–124. https://doi.org/10.1007/s13157-009-0003-4
Ket WA, Schubauer-Berigan JP, Craft CB (2011) Effects of five years of nitrogen and phosphorus additions on a Zizaniopsis miliacea tidal freshwater marsh. Aquatic Botany 95:17–23. https://doi.org/10.1016/j.aquabot.2011.03.003
Ko JY, Day JW Jr, Lane RR, Day J (2004) A comparative evaluation of cost-benefit analysis and embodied energy analysis of tertiary municipal wastewater treatment using forested wetlands in Louisiana. Ecological Economics 49:331–347. https://doi.org/10.1016/j.ecolecon.2004.01.011
Lane RR, Day JW Jr, Shaffer GP, Hunter RG, Day JN, Wood B, Settoon P (2016) Hydrology and water budget analysis of the East Joyce wetlands: past history and prospects for the future. Ecological Engineering 87:34–44. https://doi.org/10.1016/j.ecoleng
Lane RR, Mack SK, Day JW Jr, Kempka R, Brady LJ (2017) Carbon sequestration at a forested wetland receiving treated municipal effluent. Wetlands 37:861–873. https://doi.org/10.1007/s13157-017-0920-6
LDWF (2005) Bottomland hardwood Forest. Conservation Habitats & Species Assessments. LA-CWCS-DEC 2005. https://www.yumpu.com/en/document/read/48783935/bottomland-hardwood-forest-louisiana-department-of-wildlife-and-. Accessed 01 Feb 2021
Lee C-g, Fletcher TD, Sun G (2009) Nitrogen removal in constructed wetland systems. Eng Life Sci 9(1):11–22. https://doi.org/10.1002/elsc.200800049
Lin YF, Jing SR, Wang TW, Lee DY (2002) Effects of macrophytes and external carbon sources on nitrate removal from groundwater in constructed wetlands. Environ Pollut 119:413–420. https://doi.org/10.1016/S0269-7491(01)00299-8
Lofrano G, Brown J (2010) Wastewater management through the ages: a history of mankind. Sci Total Environ 408:5254–5264. https://doi.org/10.1016/j.scitotenv.2010.07.062
Louisiana Department of Environmental Quality (LDEQ) (2018) Wetland assimilation. Source: https://deq.louisiana.gov/index.cfm?md=pagebuilder&tmp=home&pid=wetland-assimilation. Accessed 02 Dec 2018
Lu S, Hu H, Sun Y, Yang J (2009) Effect of carbon source on the denitrification in constructed wetlands. J Environ Sci 21:1036–1043. https://doi.org/10.1016/S1001-0742(08)62379-7
Lundberg CJ, Shaffer GP, Wood WB, Day JW Jr (2011) Growth rates of baldcypress (Taxodium distichum) seedlings in a treated effluent assimilation marsh. Ecol Eng 37:549–553
Malecki RA, Lassoie JR, Rieger E, Seamans T (1983) Effects of long-term artificial flooding on a northern bottomland hardwood forest community. Forest Science 29:535–544
Mander Ü, Lõhmus K, Teiter S, Mauring T, Nurk K, Augustin J (2008) Gaseous fluxes in the nitrogen and carbon budgets of subsurface flow constructed wetlands. Science of the Total Environment 404:343–353. https://doi.org/10.1016/j.scitotenv.2008.03.014
Marks JC, Power ME, Parker MS (2000) Flood disturbance, algal productivity, and interannual variation in food chain length. OIKOS 90:20–27
McCann KS, Cazelles K, MacDougall AS, Fussmann GF, Bieg C, Cristescu M, Fryxell JM, Fellner G, Lapointe B, Gonzalez A (2020) Landscape modification and nutrient-driven instability at a distance. Ecol Letters. https://doi.org/10.1111/ele.13644
McCoy MM, Sloey TM, Howard RJ, Hester MW (2020) Response of tidal marsh vegetation to pulsed increases in flooding and nitrogen. Wetlands Ecol Manage 28(1):119–135. https://doi.org/10.1007/s11273-019-09699-8
McLain N, Camargo L, Whitcraft CR, Dillon JG (2020) Metrics for evaluating inundation impacts on the decomposer communities in a Southern California coastal salt marsh. Wetlands 40:1–17. https://doi.org/10.1007/s13157-020-01361-x
Menéndez M, Carlucci D, Pinna M, Comin FA, Basset A (2003) Effect of nutrients on decomposition of Ruppia cirrhosa in a shallow coastal lagoon. Hydrobiologia 506:729–735. https://doi.org/10.1023/B:HYDR.0000008568.27981.3d
Merwe JVD, Hellgren EC (2016) Spatial variation in trophic ecology of small mammals in wetlands: support for hydrological drivers. Ecosphere 7:1–11
Middleton BA, Johnson D, Roberts BJ (2015) Hydrologic remediation for the Deepwater horizon incident drove ancillary primary production increase in coastal swamps. Ecohydrology 8(5):838–850. https://doi.org/10.1002/eco.1625
Middleton BA, Souter NJ (2016) Functional integrity of freshwater forested wetlands, hydrologic alteration, and climate change. Ecosystem Health Sustainability 2:e01200
Minor A (2014) Forested freshwater wetland responses to secondarily treated municipal effluent discharge. M.S. Thesis, Nicholls State University, Thibodaux, LA, p 143
Mitsch WJ, Bernal B, Nahlik AM, Mander Ü, Zhang L, Anderson CJ, Jørgensen SE, Brix H (2013) Wetlands, carbon, and climate change. Landscape Ecology 28:583–597. https://doi.org/10.1007/s10980-012-9758-8
Mitsch WJ, Gosselink JG (2000) The value of wetlands: importance of scale and landscape setting. Ecological Economics 35:25–33. https://doi.org/10.1016/S0921-8009(00)00165-8
Mitsch WJ, Gosselink JG (2015) Wetlands, 5th edn. Wiley, Hoboken
Mitsch WJ, Rust WJ (1984) Tree growth responses to flooding in a bottomland forest in northeastern Illinois. Forestry Sci 30:499–510. https://doi.org/10.1093/forestscience/30.2.499
Mitsch WJ, Wilson RF (1996) Improving the success of wetland creation and restoration with know-how, time, and self-design. Ecol Appl 6:77–83. https://doi.org/10.2307/2269554
Nagabhatla N, Metcalfe CD (2018) Multifunctional wetlands: pollution abatement and other ecological services from natural and constructed wetlands. Springer International Publishing, Cham
Nakamura M, Utsumi S, Miki T, Ohgushi T (2005) Flood initiates bottom-up cascade in tri-trophic system: host plant regrowth increases densities of a leaf beetle and its predators. J Anim Ecol 74:683–691
Nelson JA, Johnson DS, Deegan LA, Spivak AC, Sommer NR (2018) Feedbacks between nutrient enrichment and geomorphology alter bottom-up control on food webs. Ecosystems. 22:229–242. https://doi.org/10.1007/s10021-018-0265-x
Nichols DS (1983) Capacity of natural wetlands to remove nutrients from wastewater. Water Pollution Control Federation 55(5):495–505. https://www.jstor.org/stable/25041910?seq=1.
Nielsen DL, Podnar K, Watts RJ, Wilson AL (2013) Empirical evidence linking increase hydrologic stability with decreased biotic diversity within wetlands. Hydrobiologia 708:81–96. https://doi.org/10.1007/s10750-011-0989-5
Pereira A, Tassin B, Jörgensen ASE (1994) Model for decomposition of the down vegetation in an Amazonian reservoir. Ecol Model 75(76):447–458. https://doi.org/10.1016/0304-3800(94)90039-6
Putz FE, Coley PD, Lu K, Montalvo A, Aiello A (1983) Uprooting and snapping of trees: structural determinants and ecological consequences. Can J Forest Res 13:1011–1020. https://doi.org/10.1139/x83-133
Reddy K, Kadlec R, Flaig E, Gale P (1999) Phosphorus retention in streams and wetlands: a review. Crit Rev Environ Sci Technol 29:83–146. https://doi.org/10.1080/10643389991259182
Reinhardt M, Müller B, Gächter R, Wehrli B (2006) Nitrogen removal in a small constructed wetland: an isotope mass balance approach. Environ Sci Technol 40(10):3313–3319. https://doi.org/10.1021/es052393d
Rich PH, Wetzel RG (1978) Detritus in the lake ecosystem. Am Naturalist 112:57–71. https://doi.org/10.1086/283252
Richardson CJ (1994) Ecological functions and human values in wetlands: a framework for assessing forestry impacts wetlands 14:1-9. https://doi.org/10.1007/BF03160616
Roberts BJ, Rossi R, Schutte CA, Bernhard AE, Giblin AE, Overton E, Rabalais NN (2020) Oiling Impacts on Salt Marsh Ecosystem Processes: Insights from a Large-Scale Marsh Mesocosm Experiment, presented at Gulf of Mexico Oill Spill and Ecosystem Science (GoMOSES) Conference, Tampa, FL, vol 2020, pp 3–6
Roberts BJ, Schutte CA, Rossi R, Bernhard AE, Giblin AE (2019) (2019) Oiling impacts on salt marsh nitrogen cycling rates: insights from a large-scale marsh mesocosm experiment, Abstract 622092 presented at 2019 Fall Meeting. AGU, San Francisco, CA, pp 9–13
Sawyer CN (1947) Fertilization of lakes by agricultural and urban drainage. J New Engl Water Works Assoc 61:109–127
Scholtz M (2015) Wetlands for water pollution control, 2nd edn. Elsevier, Amsterdam, p 556
Shaffer GP, Wood WB, Hoeppner SS, Perkins TE, Zoller J, Kandalepas D (2009) Degradation of baldcypress–water tupelo swamp to marsh and open water in southeastern Louisiana, USA: an irreversible trajectory? J Coastal Res 10054:152–165. https://doi.org/10.2112/SI54-006.1
Sonune A, Ghate R (2004) Developments in wastewater treatment methods. Desalination 167:55–63. https://doi.org/10.1016/j.desal.2004.06.113
Souther RF, Shaffer GP (2000) The effects of submergence and light on two age classes of baldcypress (Taxodium distichum (L.) Richard) seedlings. Wetlands 20:697–706
Spieles DJ, Mitsch WJ (2000) The effects of season and hydrologic and chemical loading on nitrate retention in constructed wetlands: a comparison of low- and high-nutrient riverine systems. Ecol Eng 14:77–91
Stefanakis AI, Akratos CS, Tsihrintzis VA (2014) Vertical flow constructed wetlands: eco-engineering systems for wastewater and sludge treatment, 1st edn. Elsevier, Burlington, p 378
Stoler AB, Golembieski MN, Stephens JP, Raffel TR (2016) Differential consumption and assimilation of leaf litter by wetland herbivores: alternative pathways for decomposition and trophic transfer. Freshwater Science 35:178–187. https://doi.org/10.1086/684205
Sundaravadivel M, Vigneswaran S (2001) Constructed wetlands for wastewater treatment. Crit Rev Environ Sci Technol 31:351–409. https://doi.org/10.1080/20016491089253
Tanner CC, Sukias JP (1995) Accumulation of organic solids in gravel-bed constructed wetlands. Water Sci Technol 32:229–239. https://doi.org/10.1016/0273-1223(95)00624-9
Tripler C, Canham C, Inouye R, Schnurr J (2002) Soil nitrogen availability, plant luxury consumption, and herbivory by white-tailed deer. Oecologia 133:517–524. https://doi.org/10.1007/s00442-002-1046-x
Turner RE (2011) Beneath the salt marsh canopy: loss of soil strength with increasing nutrient loads. Estuaries and Coasts 34:1084–1093. https://doi.org/10.1007/s12237-010-9341-y
Turner RE, Bodker JE, Schulz C (2018) The belowground intersection of nutrients and buoyancy in a freshwater marsh. Wetlands Ecology and Management 26:151–159
United States Environmental Protection Agency (USEPA) (1999) Stormwater Technology Fact Sheet: Sand Filters (EPA 832-F-99-007)
Valiela I, Vince S, Teal JM (1976) Assimilation of sewage by wetlands. In: Estuarine Processes: Uses, Stresses, and Adaptation to the Estuary, pp 234–253. https://doi.org/10.1016/B978-0-12-751801-5.50028-9
VanZomeren CM, White JR, DeLaune RD (2012) Fate of nitrate in vegetated brackish coastal marsh. Soil Sci Soc Am J 76:1919–1927
Vörösmarty CJ, Green P, Salisbury J, Lammers RB (2000) Global water resources: vulnerability from climate change and population growth. Science 289:284–288. https://doi.org/10.1126/science.289.5477.284
Vuorinen H, Juuti P, Katko T (2007) History of water and health from ancient civilizations to modern times. Water Sci Technol 7:49–57. https://doi.org/10.2166/ws.2007.006
Vymazal J (2007) Removal of nutrients in various types of constructed wetlands. Sci Total Environ 380:48–65. https://doi.org/10.1016/j.scitotenv.2006.09.014
Vymazal J (2010) Constructed wetlands for wastewater treatment. Water 2:530–549. https://doi.org/10.3390/w2030530
Watson EB, Oczkowski AJ, Wigand C, Hanson AR, Davey EW, Crosby SC, Johnson RL, Andrews HM (2014) Nutrient enrichment and precipitation changes do not enhance resiliency of salt marshes to sea level rise in the Northeastern U.S. Climatic Change 125:501–509. https://doi.org/10.1007/s10584-014-1189-x
Webster JR, Benfield EF (1986) Vascular plant breakdown in freshwater ecosystems annual review of ecology. Evolution Syst 17:567–594. https://doi.org/10.1146/annurev.es.17.110186.003031
Weller MO, Bossart JL (2017) Insect community tracks degradation and recovery of a wastewater assimilation marsh in southeastern Louisiana. Wetlands 37:661–673. https://doi.org/10.1007/s13157-017-0897-1
Whiting GJ, Chanton JP (2001) Greenhouse carbon balance of wetlands: methane emission versus carbon sequestration. Tellus B 53:521–528. https://doi.org/10.1034/j.1600-0889.2001.530501.x
Xie Y, Yu D, Ren B (2004) Effects of nitrogen and phosphorus availability on the decomposition of aquatic plants. Aquatic Botany 80:29–37. https://doi.org/10.1016/j.aquabot.2004.07.002
Zeing B (2003) Functional equilibrium between photosynthetic and above-ground nonphotosynthetic structures of plants: evidence from a pruning experiment with three subtropical tree species. Acta Botanica Sinica 45:152–157
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The authors extend gratitude to E. Yando and the anonymous reviewers for their edits and suggestions to enhance this manuscript.
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All authors contributed to the conception, review of literature, and execution of this review manuscript. TMS composed the first draft and BJR, SRF, and JAN authors provided section content and collected data for tables. BJR and JAN provided review of final draft; editing and revision was provided by TMS.
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Sloey, T.M., Roberts, B.J., Flaska, S.R. et al. Critical Research Gaps for Understanding Environmental Impacts of Discharging Treated Municipal Wastewater into Assimilation Wetlands. Wetlands 41, 15 (2021). https://doi.org/10.1007/s13157-021-01396-8
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DOI: https://doi.org/10.1007/s13157-021-01396-8