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A global perspective on wetland salinization: ecological consequences of a growing threat to freshwater wetlands

Journal Article · · Ecosphere
DOI:https://doi.org/10.1890/ES14-00534.1· OSTI ID:1438199
 [1];  [2];  [3];  [4];  [4];  [5];  [6];  [7];  [8]
  1. Indiana Univ., Bloomington, IN (United States); Indiana University
  2. Victoria Univ. (New Zealand)
  3. Univ. of Nebraska, Lincoln, NE (United States)
  4. Virginia Commonwealth Univ., Richmond, VA (United States)
  5. East Carolina Univ., Greenville, NC (United States)
  6. Northern Kentucky Univ., Highland Heights, KY (United States)
  7. Radboud Univ., Nijmegen (Netherlands)
  8. Federation Univ. Australia, Mt. Helen, VIC (Australia)
Salinization, a widespread threat to the structure and ecological functioning of inland and coastal wetlands, is currently occurring at an unprecedented rate and geographic scale. The causes of salinization are diverse and include alterations to freshwater flows, land-clearance, irrigation, disposal of wastewater effluent, sea level rise, storm surges, and applications of de-icing salts. Climate change and anthropogenic modifications to the hydrologic cycle are expected to further increase the extent and severity of wetland salinization. Salinization alters the fundamental physicochemical nature of the soil-water environment, increasing ionic concentrations and altering chemical equilibria and mineral solubility. Increased concentrations of solutes, especially sulfate, alter the biogeochemical cycling of major elements including carbon, nitrogen, phosphorus, sulfur, iron, and silica. The effects of salinization on wetland biogeochemistry typically include decreased inorganic nitrogen removal (with implications for water quality and climate regulation), decreased carbon storage (with implications for climate regulation and wetland accretion), and increased generation of toxic sulfides (with implications for nutrient cycling and the health/functioning of wetland biota). Indeed, increased salt and sulfide concentrations induce physiological stress in wetland biota and ultimately can result in large shifts in wetland communities and their associated ecosystem functions. The productivity and composition of freshwater species assemblages will be highly altered, and there is a high potential for the disruption of existing interspecific interactions. Although there is a wealth of information on how salinization impacts individual ecosystem components, relatively few studies have addressed the complex and often non-linear feedbacks that determine ecosystem-scale responses or considered how wetland salinization will affect landscape-level processes. Although the salinization of wetlands may be unavoidable in many cases, these systems may also prove to be a fertile testing ground for broader ecological theories including (but not limited to): investigations into alternative stable states and tipping points, trophic cascades, disturbance-recovery processes, and the role of historical events and landscape context in driving community response to disturbance.
Research Organization:
Tulane Univ., New Orleans, LA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Grant/Contract Number:
FC02-06ER64298
OSTI ID:
1438199
Journal Information:
Ecosphere, Journal Name: Ecosphere Journal Issue: 10 Vol. 6; ISSN 2150-8925
Publisher:
Ecological Society of AmericaCopyright Statement
Country of Publication:
United States
Language:
English

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  • van der Welle, Marlies Elizabeth Wilhelmina; Cuppens, Mieke; Lamers, Leon Peter Maria
  • Environmental Toxicology and Chemistry, Vol. 25, Issue 6 https://doi.org/10.1897/05-283R.1
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Extracellular enzyme activity and uptake of carbon and nitrogen along an estuarine salinity and nutrient gradient journal January 2003
Effects of Environmental Salinity on Vertebrate Florivory and Wetland Communities journal January 2006
Sulfate-reducing microorganisms in wetlands – fameless actors in carbon cycling and climate change journal January 2012
Sulfide as a soil phytotoxin—a review journal January 2013
Salinization of soil over saline-sodic overburden from the oil sands in Alberta journal December 2010
Sulfate reduction in a New England salt marsh1: Salt marsh sulfate reduction journal November 1979
Nitrogen fixation in the temperate estuarine intertidal sediments of the River Lune: Sediment nitrogen fixation journal May 1982
Nitrogen fixation in freshwater, estuarine, and marine ecosystems. 1. Rates and importance journal January 1988
Comparison of microbial dynamics in marine and freshwater sediments: Contrasts in anaerobic carbon catabolism journal January 1988
A comparison of the ecology of planktonic bacteria in fresh and salt water journal January 1988
Forested wetlands in freshwater and salt-water environments journal January 1988
A comparison of the ecology of planktonic bacteria in fresh and salt water: Ecology of planktonic bacteria journal July 1988
Forested wetlands in freshwater and salt-water environments: Forested wetlands journal July 1988
Organic carbon oxidation and suppression of methane production by microbial Fe(III) oxide reduction in vegetated and unvegetated freshwater wetland sediments journal December 1996
The rates and pathways of carbon oxidation in bioturbated saltmarsh sediments journal January 2002
Compositional changes in free-living bacterial communities along a salinity gradient in two temperate estuaries journal March 2002
Factors controlling the extent of eutrophication and toxicity in sulfate-polluted freshwater wetlands journal March 2002
Transport of dissolved inorganic carbon from a tidal freshwater marsh to the York River estuary journal January 2003
Freshwater input structures soil properties, vertical accretion, and nutrient accumulation of Georgia and U.S tidal marshes journal May 2007
The effect of riverine discharge on biogeochemical processes in estuarine sediments journal August 2011
Saltwater intrusion into tidal freshwater marshes alters the biogeochemical processing of organic carbon journal January 2013
Anaerobic oxidation of methane: an underappreciated aspect of methane cycling in peatland ecosystems? journal January 2011
Impacts of climate variability on wetland salinization in the North American prairies journal January 2014
Intensively exploited Mediterranean aquifers: resilience to seawater intrusion and proximity to critical thresholds journal January 2014
Inter-hemispheric temperature variability over the past millennium text January 2014

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Effect of Drought-Induced Salinization on Wetland Methane Emissions, Gross Ecosystem Productivity, and Their Interactions journal August 2019
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Differential effects of chronic and acute simulated seawater intrusion on tidal freshwater marsh carbon cycling journal March 2018
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Model instability and channel connectivity for 2D coastal marsh simulations journal September 2018
5-Aminolevulinic acid (ALA) biosynthetic and metabolic pathways and its role in higher plants: a review journal December 2018
Linking residential saltwater intrusion risk perceptions to physical exposure of climate change impacts in rural coastal communities of North Carolina journal July 2019
Seasonal and Long-Term Dynamics in Stream Water Sodium Chloride Concentrations and the Effectiveness of Road Salt Best Management Practices journal January 2019
Linking variability in climate to wetland habitat suitability: is it possible to forecast regional responses from simple climate measures? journal November 2018
A Landscape-Scale Assessment of Above- and Belowground Primary Production in Coastal Wetlands: Implications for Climate Change-Induced Community Shifts journal October 2016
Declines in Plant Productivity Drive Carbon Loss from Brackish Coastal Wetland Mesocosms Exposed to Saltwater Intrusion journal July 2018
Assessing the ability of zebrafish scales to contribute to the short-term homeostatic regulation of [Ca2+] in the extracellular fluid during calcemic challenges journal September 2019
Ecological Value of the Sorokaoziorki Wetland Complex in the Steppe of Central Eurasia (Khakassia, Russian Federation) journal February 2018
Wetlands In a Changing Climate: Science, Policy and Management journal April 2018
Biogeochemical Characteristics of the Last Floating Coastal Bog Remnant in Europe, the Sehestedt Bog journal October 2018
Denitrification Potential and Carbon Mineralization in Restored and Unrestored Coastal Wetland Soils Across an Urban Landscape journal April 2019
Environmental Controls on CO2 Exchange along a Salinity Gradient in a Saline Boreal Fen in the Athabasca Oil Sands Region journal December 2019
Herpetofauna Occupancy and Community Composition along a Tidal Swamp Salinity Gradient journal January 2020
Modulators of mercury risk to wildlife and humans in the context of rapid global change journal January 2018
A global dataset of surface water and groundwater salinity measurements from 1980–2019 journal July 2020
Assisted natural recovery of hypersaline sediments: salinity thresholds for the establishment of a community of bioturbating organisms journal January 2018
Salting our freshwater lakes journal April 2017
Assessment of soil salinisation in the Ejina Oasis located in the lower reaches of Heihe River, Northwestern China journal December 2018
The Invisible Flood: The Chemistry, Ecology, and Social Implications of Coastal Saltwater Intrusion journal May 2019
Salt in freshwaters: causes, effects and prospects - introduction to the theme issue
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Lost in translation: the German literature on freshwater salinization journal December 2018
Do all roads lead to Rome? Exploring community trajectories in response to anthropogenic salinization and dilution of rivers
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Salinity impacts on river ecosystem processes: a critical mini-review journal December 2018
Evolved tolerance to freshwater salinization in zooplankton: life-history trade-offs, cross-tolerance and reducing cascading effects journal December 2018
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Temperature affects acute mayfly responses to elevated salinity: implications for toxicity of road de-icing salts journal December 2018
Genomic signature of ongoing alkaline adaptation in a Schizothoracine fish (Cyprinidae) inhabiting soda lake on the Tibetan Plateau posted_content October 2019
Genomic signature of accelerated evolution in a saline-alkaline lake-dwelling Schizothoracine fish journal January 2020
Direct and indirect controls on organic matter decomposition in four coastal wetland communities along a landscape salinity gradient journal December 2017
A Review of Water Quality Responses to Air Temperature and Precipitation Changes 1: Flow, Water Temperature, Saltwater Intrusion journal December 2018
Emerging threats and persistent conservation challenges for freshwater biodiversity journal November 2018
A review of the species, community, and ecosystem impacts of road salt salinisation in fresh waters journal March 2019
A meta-analysis of soil salinization effects on nitrogen pools, cycles and fluxes in coastal ecosystems journal August 2016
Novel microbial community composition and carbon biogeochemistry emerge over time following saltwater intrusion in wetlands journal December 2018
Influence of salt stress on propagation, growth and nutrient uptake of typical aquatic plant species journal December 2019
Xylem–phloem hydraulic coupling explains multiple osmoregulatory responses to salt stress journal June 2019
Saving freshwater from salts journal February 2016
Coastal Land Use in Northeast Brazil: Mangrove Coverage Evolution Over Three Decades journal January 2019
First human impacts and responses of aquatic systems: A review of palaeolimnological records from around the world journal December 2017
Bird community shifts associated with saltwater exposure in coastal forests at the leading edge of rising sea level journal May 2019
Bund removal to re-establish tidal flow, remove aquatic weeds and restore coastal wetland services—North Queensland, Australia journal January 2020
Chronic Exposure to High Concentrations of Road Salt Decreases the Immune Response of Dragonfly Larvae journal October 2019
Evolutionary history influences the salinity preference of bacterial taxa in wetland soils journal October 2015
Impacts of Elevated CO2 Levels on the Soil Bacterial Community in a Natural CO2-Enhanced Oil Recovery Area journal May 2019
Effects of Tidal Scenarios on the Methane Emission Dynamics in the Subtropical Tidal Marshes of the Min River Estuary in Southeast China journal August 2019
Assessing the Changes of Ecosystem Services in the Nansi Lake Wetland, China journal April 2019
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Carbon degradation in agricultural soils flooded with seawater after managed coastal realignment journal November 2016