Influence of relict milldams on riparian sediment biogeochemistry

Peck, Erin K.; Inamdar, Shreeram; Peipoch, Marc; Gold, Arthur J.

doi:10.1007/s11368-023-03507-w

Cited by 2 publications

(7 citation statements)

References 75 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Chiques Creek is an agriculture stream running through Lancaster County in Pennsylvania while the Cooch dam site is a more urbanized site near Newark in Delaware. Previous studies for the Roller and Cooch riparian sediments indicated significant differences in biogeochemistry ( Inamdar et al, 2022 ; Peck et al, 2022 , 2023 ). The sediment samples from Chiques Creek contained higher %C, %N, nitrate-N, and metals (Cu, Zn, Ca etc.)…”

Section: Discussionmentioning

confidence: 94%

“…For Krady, the dam removal occurred in 2–4 h and riparian sediments drained within days ( Lewis et al, 2021 ). Riparian sediments above all the dams are primarily fine-grained with lenses of coarse grained (sand) sediments ( Peck et al, 2022 , 2023 ). Carbon dating of buried organic material at depths of 3–4 m suggest that much of the riparian legacy sediments were deposited in the past 200–300 years ( Peck et al, 2022 ).…”

Section: Methodsmentioning

confidence: 99%

“…A total of five riparian sediment cores were collected using a hand-operated auger to a depth of refusal (~3–4 m): two from Krady dam site (KMW1B and KMW3B), one from Roller milldam (RMT1W1), and two from Cooch milldam (CMT1W1 and CMT2W1). All of these cores were collected within 10 m from the stream edge and detailed sampling sites, procedures, and chemical analyses can be found in previous publications ( Inamdar et al, 2022 ; Peck et al, 2022 , 2023 ; Sherman et al, 2022 ). The cores were segmented to different depths on site, stored in air-tight Whirl-Pak® bags and transported to the lab on ice (4°C; Table 1 ).…”

Section: Methodsmentioning

confidence: 99%

“…Milldams also alter the hydrologic environment with high stream and groundwater levels upstream (typically equal to the height of the dam) and lower levels and drier conditions downstream ( Sherman et al, 2022 ). The high-water levels and wet and stagnant conditions upstream of the dams promote hypoxic and anoxic conditions in stream and riparian sediments with consequences for carbon and nitrogen biogeochemistry and cycling ( Inamdar et al, 2020 , 2022 ; Hripto et al, 2022 ; Peck et al, 2022 , 2023 ). In contrast, when dams are removed, upstream stream and groundwater levels drop rapidly resulting in drained and oxic riparian sediments ( Lewis et al, 2021 ) that are susceptible to fluvial and subaerial erosive processes ( Wolman, 1959 ; Fox et al, 2016 ; Gellis et al, 2017 ).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Mill dams impact microbiome structure and depth distribution in riparian sediments

et al. 2023

Self Cite

View full text Add to dashboard Cite

IntroductionDamming has substantially fragmented and altered riverine ecosystems worldwide. Dams slow down streamflows, raise stream and groundwater levels, create anoxic or hypoxic hyporheic and riparian environments and result in deposition of fine sediments above dams. These sediments represent a good opportunity to study human legacies altering soil environments, for which we lack knowledge on microbial structure, depth distribution, and ecological function.MethodsHere, we compared high throughput sequencing of bacterial/ archaeal and fungal community structure (diversity and composition) and functional genes (i.e., nitrification and denitrification) at different depths (ranging from 0 to 4 m) in riparian sediments above breached and existing milldams in the Mid-Atlantic United States.ResultsWe found significant location- and depth-dependent changes in microbial community structure. Proteobacteria, Bacteroidetes, Firmicutes, Actinobacteria, Chloroflexi, Acidobacteria, Planctomycetes, Thaumarchaeota, and Verrucomicrobia were the major prokaryotic components while Ascomycota, Basidiomycota, Chytridiomycota, Mortierellomycota, Mucoromycota, and Rozellomycota dominated fungal sequences retrieved from sediment samples. Ammonia oxidizing genes (amoA for AOA) were higher at the sediment surface but decreased sharply with depth. Besides top layers, denitrifying genes (nosZ) were also present at depth, indicating a higher denitrification potential in the deeper layers. However, these results contrasted with in situ denitrification enzyme assay (DEA) measurements, suggesting the presence of dormant microbes and/or other nitrogen processes in deep sediments that compete with denitrification. In addition to enhanced depth stratification, our results also highlighted that dam removal increased species richness, microbial diversity, and nitrification.DiscussionLateral and vertical spatial distributions of soil microbiomes (both prokaryotes and fungi) suggest that not only sediment stratification but also concurrent watershed conditions are important in explaining the depth profiles of microbial communities and functional genes in dammed rivers. The results also provide valuable information and guidance to stakeholders and restoration projects.

show abstract

Section: Discussionmentioning

confidence: 94%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Mill dams impact microbiome structure and depth distribution in riparian sediments

et al. 2023

Self Cite

View full text Add to dashboard Cite

show abstract

“…The sediments upstream of the dam at both riparian sites were predominantly silt and clay (56%–100%; Peck et al., 2022) with thickness of the riparian sediments varying between 1 and 4 m depending on the height of the dam. Organic matter in the upstream riparian sediments varied between 0.7% and 9.8% (Peck et al., 2023). Sodium (Na + ) at the road‐salt affected Cooch site was significantly greater than Roller for both soil (mean 293 vs. 38 mg kg −1 , respectively) and groundwater (mean 199 vs. 33 mg L −1 , respectively) (Inamdar et al., 2022).…”

Section: Methodsmentioning

confidence: 99%

Riparian Groundwater Nitrogen (N) Isotopes Reveal Human Imprints of Dams and Road Salt Salinization

Inamdar,

Peipoch,

Sena

et al. 2024

Geophysical Research Letters

Self Cite

View full text Add to dashboard Cite

Groundwater nitrate‐N isotopes (δ15N‐) have been used to infer the effects of natural and anthropogenic change on N cycle processes in the environment. Here we report unexpected changes in groundwater δ15N‐ for riparian zones affected by relict milldams and road salt salinization. Contrary to natural, undammed conditions, groundwater δ15N‐ values declined from the upland edge through the riparian zone and were lowest near the stream. Groundwater δ15N‐ values increased for low electron donor (dissolved organic carbon) to acceptor ratios but decreased beyond a change point in ratios. Groundwater δ15N‐ values were particularly low for the riparian milldam site subjected to road‐salt salinization. We attributed these N isotopic trends to suppression of denitrification, occurrence of dissimilatory nitrate reduction to ammonium (DNRA), and/or effects of road salt salinization. Groundwater δ15N‐ can provide valuable insights into process mechanisms and can serve as “imprints” of anthropogenic activities and legacies.

show abstract

Influence of relict milldams on riparian sediment biogeochemistry

Cited by 2 publications

References 75 publications

Mill dams impact microbiome structure and depth distribution in riparian sediments

Mill dams impact microbiome structure and depth distribution in riparian sediments

Riparian Groundwater Nitrogen (N) Isotopes Reveal Human Imprints of Dams and Road Salt Salinization

Contact Info

Product

Resources

About