scholarly journals Urbanization Altered Bacterial and Archaeal Composition in Tidal Freshwater Wetlands Near Washington DC, USA, and Buenos Aires, Argentina

2019 ◽  
Vol 7 (3) ◽  
pp. 72 ◽  
Author(s):  
Martina Gonzalez Mateu ◽  
Cedric Park ◽  
Cullen McAskill ◽  
Andrew Baldwin ◽  
Stephanie Yarwood
Keyword(s):  
Plant Species ◽  
Buenos Aires ◽  
Tidal Freshwater ◽  
Freshwater Wetlands ◽  
Rural Setting ◽  
Nitrifying Bacteria ◽  
Urban Site ◽  
Rrna Gene ◽  
Tidal Freshwater Wetlands ◽  
Urban Sites

Urban expansion causes coastal wetland loss, and environmental stressors associated with development can lead to wetland degradation and loss of ecosystem services. This study investigated the effect of urbanization on prokaryotic community composition in tidal freshwater wetlands. Sites in an urban, suburban, and rural setting were located near Buenos Aires, Argentina, and Washington D.C., USA. We sampled soil associated with two pairs of functionally similar plant species, and used Illumina sequencing of the 16S rRNA gene to examine changes in prokaryotic communities. Urban stressors included raw sewage inputs, nutrient pollution, and polycyclic aromatic hydrocarbons. Prokaryotic communities changed along the gradient (nested PerMANOVA, Buenos Aires: p = 0.005; Washington D.C.: p = 0.001), but did not differ between plant species within sites. Indicator taxa included Methanobacteria in rural sites, and nitrifying bacteria in urban sites, and we observed a decrease in methanogens and an increase in ammonia-oxidizers from rural to urban sites. Functional profiles in the Buenos Aires communities showed higher abundance of pathways related to nitrification and xenobiotic degradation in the urban site. These results suggest that changes in prokaryotic taxa across the gradient were due to surrounding stressors, and communities in urban and rural wetlands are likely carrying out different functions.

scholarly journals Vegetation Effects on Bacteria and Denitrifier Abundance in the Soils of Two Tidal Freshwater Wetlands in Virginia

2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Joseph C. Morina ◽  
Ember M. Morrissey ◽  
Rima B. Franklin
Keyword(s):  
Plant Species ◽  
Quantitative Polymerase Chain Reaction ◽  
Typha Latifolia ◽  
Growing Season ◽  
Tidal Freshwater ◽  
Freshwater Wetlands ◽  
Juncus Effusus ◽  
Peltandra Virginica ◽  
Tidal Freshwater Wetlands ◽  
Plant Effects

This study examined the abundance of bacteria and nirS-type denitrifiers associated with the rhizospheres of three emergent macrophyte species (Juncus effusus, Typha latifolia, and Peltandra virginica) to gain a greater understanding of plant-microbe interactions in wetland soils. Sampling of plant and soil properties was performed during the growing season (June) and following plant senescence (November) at two tidal freshwater wetlands. Quantitative polymerase chain reaction was used to determine the abundance of bacteria (16S rRNA) and nirS-type denitrifier genes from the rhizosphere and rhizoplane of each plant species and from nearby unvegetated soils. For bacteria, there was a positive rhizosphere effect that did not differ significantly across plant species. In contrast, significant differences in the abundance of nirS-type denitrifiers were observed across the plant species. Rhizosphere abundance was ∼2-fold greater in Peltandra virginica and 4-fold greater in Typha latifolia compared to Juncus effusus. For both bacteria and nirS-type denitrifiers, plant effects were greater during the growing season, and abundance was highly correlated with soil pH, moisture, and organic matter content. Overall, these results demonstrate plant effects on the rhizosphere microbial community can be species‐specific and that there is a synergistic relationship between plant species and environmental conditions.

scholarly journals Site History and Edaphic Features Override the Influence of Plant Species on Microbial Communities in Restored Tidal Freshwater Wetlands

2015 ◽  
Vol 81 (10) ◽  
pp. 3482-3491 ◽  
Author(s):  
Christine E. Prasse ◽  
Andrew H. Baldwin ◽  
Stephanie A. Yarwood
Keyword(s):  
Microbial Communities ◽  
Methane Oxidation ◽  
Plant Species ◽  
Tidal Freshwater ◽  
Freshwater Wetlands ◽  
Gene Copy ◽  
Microbial Composition ◽  
Content Type ◽  
Tidal Freshwater Wetlands ◽  
Site History

ABSTRACTRestored wetland soils differ significantly in physical and chemical properties from their natural counterparts even when plant community compositions are similar, but effects of restoration on microbial community composition and function are not well understood. Here, we investigate plant-microbe relationships in restored and natural tidal freshwater wetlands from two subestuaries of the Chesapeake Bay. Soil samples were collected from the root zone ofTypha latifolia,Phragmites australis,Peltandra virginica, andLythrum salicaria. Soil microbial composition was assessed using 454 pyrosequencing, and genes representing bacteria, archaea, denitrification, methanogenesis, and methane oxidation were quantified. Our analysis revealed variation in some functional gene copy numbers between plant species within sites, but intersite comparisons did not reveal consistent plant-microbe trends. We observed more microbial variations between plant species in natural wetlands, where plants have been established for a long period of time. In the largest natural wetland site, sequences putatively matching methanogens accounted for ∼17% of all sequences, and the same wetland had the highest numbers of genes coding for methane coenzyme A reductase (mcrA). Sequences putatively matching aerobic methanotrophic bacteria and anaerobic methane-oxidizing archaea (ANME) were detected in all sites, suggesting that both aerobic and anaerobic methane oxidation are possible in these systems. Our data suggest that site history and edaphic features override the influence of plant species on microbial communities in restored wetlands.

Juvenile Salmonid Use of Reconnected Tidal Freshwater Wetlands in Grays River, Lower Columbia River Basin

2010 ◽  
Vol 139 (4) ◽  
pp. 1211-1232 ◽  
Author(s):  
G. Curtis Roegner ◽  
Earl W. Dawley ◽  
Micah Russell ◽  
Allan Whiting ◽  
David J. Teel
Keyword(s):  
River Basin ◽  
Columbia River ◽  
Tidal Freshwater ◽  
Freshwater Wetlands ◽  
Columbia River Basin ◽  
Tidal Freshwater Wetlands

scholarly journals Evaluating Restored Tidal Freshwater Wetlands

2019 ◽  
pp. 889-912 ◽  
Author(s):  
Andrew H. Baldwin ◽  
Richard S. Hammerschlag ◽  
Donald R. Cahoon
Keyword(s):  
Tidal Freshwater ◽  
Freshwater Wetlands ◽  
Tidal Freshwater Wetlands

Tidal Freshwater Wetlands

2019 ◽  
pp. 619-640
Author(s):  
Dennis F. Whigham ◽  
Andrew H. Baldwin ◽  
Aat Barendregt
Keyword(s):  
Tidal Freshwater ◽  
Freshwater Wetlands ◽  
Tidal Freshwater Wetlands

scholarly journals Hydrologic Versus Biogeochemical Controls of Denitrification in Tidal Freshwater Wetlands

2012 ◽  
Vol 36 (3) ◽  
pp. 519-532 ◽  
Author(s):  
Scott Ensign ◽  
Kaylyn Siporin ◽  
Mike Piehler ◽  
Martin Doyle ◽  
Lynn Leonard
Keyword(s):  
Tidal Freshwater ◽  
Freshwater Wetlands ◽  
Tidal Freshwater Wetlands
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