Linking soil process and microbial ecology in freshwater wetland ecosystems

2006 ◽  
Vol 289 (1-2) ◽  
pp. 17-34 ◽  
Author(s):  
Jessica L. M. Gutknecht ◽  
Robert M. Goodman ◽  
Teri C. Balser
Keyword(s):  
Microbial Ecology ◽  
Freshwater Wetland ◽  
Wetland Ecosystems ◽  
Soil Process

scholarly journals Microbial subnetworks related to short-term diel O2fluxes within geochemically distinct freshwater wetlands

2018 ◽  
Author(s):  
Dean J. Horton ◽  
Matthew J. Cooper ◽  
Anthony J. Wing ◽  
Peter S. Kourtev ◽  
Donald G. Uzarski ◽  
...  
Keyword(s):  
Community Structure ◽  
Microbial Community ◽  
Microbial Communities ◽  
Archaeal Community ◽  
Freshwater Wetlands ◽  
Freshwater Wetland ◽  
Short Term ◽  
Wetland Ecosystems ◽  
Biogeochemical Transformations ◽  
Physical And Chemical

ABSTRACTO2concentrations often fluctuate over diel timescales within wetlands, driven by temperature, sunlight, photosynthesis, and respiration. These daily fluxes have been shown to impact biogeochemical transformations (e.g. denitrification), which are mediated by the residing microbial community. However, little is known about how resident microbial communities respond to diel dramatic physical and chemical fluxes in freshwater wetland ecosystems. In this study, total microbial (bacterial and archaeal) community structure was significantly related to diel time points in just one out of four distinct freshwater wetlands sampled. This suggests that daily environmental shifts may influence wetlands differentially based upon the resident microbial community and specific physical and chemical conditions of a freshwater wetland. However, when exploring at finer resolutions of the microbial communities within each wetland, subcommunities within two wetlands were found to correspond to fluctuating O2levels. Microbial taxa that were found to be susceptible to fluctuating O2levels within these subnetworks may have intimate ties to metabolism and/or diel redox cycles. This study highlights that freshwater wetland microbial communities are often stable in community structure when confronted with short-term O2fluxes, however, specialist taxa may be sensitive to these same fluxes.

Estimating cultural benefits from surface water status improvements in freshwater wetland ecosystems

2016 ◽  
Vol 545-546 ◽  
pp. 219-226 ◽  
Author(s):  
Peter Roebeling ◽  
Nelson Abrantes ◽  
Sofia Ribeiro ◽  
Pedro Almeida
Keyword(s):  
Surface Water ◽  
Water Status ◽  
Freshwater Wetland ◽  
Wetland Ecosystems

Remediation of an Oil-Contaminated Experimental Freshwater Wetland: II. Habitat Recovery and Toxicity Reduction

2001 ◽  
Vol 2001 (1) ◽  
pp. 323-328 ◽  
Author(s):  
Kenneth Lee ◽  
Kenneth G. Doe ◽  
Lucila E. J. Lee ◽  
Makram T. Suidan ◽  
Albert D. Venosa
Keyword(s):  
Plant Growth ◽  
Ammonium Nitrate ◽  
Enhanced Recovery ◽  
Freshwater Wetland ◽  
Residual Oil ◽  
Similar Treatment ◽  
Wetland Ecosystems ◽  
Habitat Recovery ◽  
Nutrient Amendment ◽  
Induced Tolerance

ABSTRACT A controlled oil spill experiment to determine natural recovery rates and the efficacy of potential remediation strategies in wetland ecosystems was initiated in June 1999 at a site on the St. Lawrence River, Canada dominated by Scirpus pungens. A weathered light crude oil (Mesa) was applied on 16 plots (5 m × 4 m) at the rate of 12 L per plot. Treatment of the plots included: natural attenuation (no treatment), nutrient amendment with granular ammonium nitrate and super triple phosphate, a similar treatment with plants continuously cut back (to evaluate the influence of plant growth on remediation), and a nutrient amendment treatment with sodium nitrate instead of ammonium nitrate. To elucidate the effect of nutrient amendments alone, four unoiled plots were fertilized with ammonium nitrate and triple super phosphate. Sediment samples were routinely recovered for chemical and toxicological analysis over a 21-week period that effectively covered the natural growth season of the plants. Significant changes in biological measures of habitat were observed. S. pungens, the dominant plant species, was tolerant to the oil, and its growth was significantly enhanced above that of the unoiled control by the addition of nutrients. Other biotest organisms (bacteria, Vibrio sp.,; invertebrates, Daphnia, Hyalella, and Viviparus sp.) provided additional evidence of both enhanced recovery and potential detrimental effects. GC-MS analysis could not resolve significant changes in the composition of the residual oil as a result of experimental treatments. This discrepancy in the detection of treatment efficacy between the chemical and biological methods may be due to induced tolerance to the contaminant hydrocarbons, changes in the bioavailability of the residual oil associated with stimulated plant growth, and detrimental effects of the type and quantity of bioremediation agents used.

scholarly journals Vulnerability and impacts of climate change on forest and freshwater wetland ecosystems in Nepal: A review

AMBIO ◽  
2017 ◽  
Vol 46 (8) ◽  
pp. 915-930 ◽  
Author(s):  
Pramod Lamsal ◽  
Lalit Kumar ◽  
Kishor Atreya ◽  
Krishna Prasad Pant
Keyword(s):  
Climate Change ◽  
Freshwater Wetland ◽  
Wetland Ecosystems ◽  
Impacts Of Climate Change

scholarly journals Mercury cycling and effects in freshwater wetland ecosystems

1993 ◽  
Vol 12 (12) ◽  
pp. 2245-2264 ◽  
Author(s):  
E.J. Zillioux ◽  
D.B. Porcella ◽  
J.M. Benoit
Keyword(s):  
Freshwater Wetland ◽  
Mercury Cycling ◽  
Wetland Ecosystems

scholarly journals Nitrous Oxide Emission from a Flooded Tropical Wetland across a Vegetation and Land Use Gradient

2021 ◽  
Author(s):  
David Were ◽  
Thomas Hein
Keyword(s):  
Nitrous Oxide ◽  
Typha Latifolia ◽  
Rice Paddy ◽  
Freshwater Wetland ◽  
Emission Rates ◽  
Wet Season ◽  
Vegetation Community ◽  
Wetland Ecosystems ◽  
Continuous Flooding ◽  
Tropical Freshwater

Abstract Whereas wetland ecosystems are among the most vital natural carbon sinks, they are also important sources of nitrous oxide (N2O), a highly potent greenhouse gas. However, due to differences in wetland characteristics, N2O emission is likely to vary across wetland types. We investigated the: 1) influence of vegetation community (Typha latifolia; Typha, Phragmites mauritianus; Phragmites and Cyperus papyrus; Papyrus) in a natural tropical freshwater wetland, and 2) impact of converting a natural tropical freshwater wetland into a rice paddy wetland on N2O emission. Results showed that N2O emission (µg m− 2 h− 1) from the natural wetland did not vary significantly (p > 0.05) among the vegetation communities during both the dry and wet seasons (Typha = 0.6 ± 1.6 [SE] and 0.5 ± 1.4, Phragmites = 0.5 ± 1.7 and 0.4 ± 1.5, Papyrus = 0.5 ± 1.3 and 0.5 ± 1.5, respectively). These emission rates insignificantly differed (p > 0.05) from those recorded in the rice paddy wetland (dry season = 0.7 ± 2.8 and wet season = 0.6 ± 2.7). There was no significant correlation (p > 0.05) between soil physico-chemical characteristics and N2O emission. We concluded that vegetation community does not affect N2O emission from a natural tropical freshwater wetland under continuous flooding. Similarly, under continuous flooding and no fertilization conditions, converting a natural tropical freshwater wetland into a rice paddy wetland does not influence N2O emission. We roughly estimated total annual N2O emissions (T yr− 1) and their carbon dioxide equivalents (CO2e; T yr− 1) from all Uganda’s natural and rice paddy wetlands as: natural wetlands = 115.1 ± 342.8 (CO2e = 30,501.5 ± 90,842) and rice paddy wetlands = 0.9 ± 2.7 (CO2e = 242.5 ± 707.6).

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