Cited by 28Coastal wetland ecosystem dynamicsHydrology and Sediment Transport ProcessesMarine and coastal ecosystems

Storm‐driven particulate organic matter flux connects a tidal tributary floodplain wetland, mainstem river, and estuary

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Thom, Ronald M., Breithaupt, Stephen A., Diefenderfer, Heida L., Borde, Amy B., Roegner, G. Curtis, Johnson, Gary E., Woodruff, Dana L.·2018·Ecological Applications

Abstract

The transport of terrestrial plant matter into coastal waters is important to regional and global biogeochemical cycles, and methods for assessing and predicting fluxes in such dynamic environments are needed. We investigated the hypothesis that upon reconnection of a floodplain wetland to its mainstem river, organic matter produced in the wetland would reach other parts of the ecosystem. If so, we can infer that the organic matter would ultimately become a source for the food web in the mainstem river and estuary. To accomplish this, we adapted numerical hydrodynamic and transport modeling methods to estimate the mass of particulate organic matter (POM) derived from the annually senescent aboveground parts of herbaceous marsh plants (H‐POM). The Finite‐Volume Community Ocean Model (FVCOM), parameterized with flow, tide, and aboveground biomass data, simulated H‐POM mobilization from fluid shear stress during tidal exchange, flooding, and variable river flow; entrainment into the water column; transport via channel and overland flow; and entrapment when wetted surfaces dry. We examined export from a recently reconnected, restoring tidal emergent marsh on the Grays River, a tributary to the Columbia River estuary. Modeling indicated that hydrologically reconnecting 65 ha at the site resulted in export of about 96 × 10 3 kg of H‐POM, primarily during pulsed storm flooding events in autumn and early winter. This exported mass amounted to about 19% of the summer peak aboveground biomass measured at the site. Of that 19%, about 48% (47 × 10 3 kg) was deposited downstream in the Grays River and floodplain wetlands, and the remaining 52% (50 × 10 3 kg) passed the confluence of the Grays River and the mainstem estuary located about 7 km from the study site. The colonization of the restoring study site largely by nonnative Phalaris arundinacea (reed canarygrass) may have resulted in 18–28% lower H‐POM mobilization than typical marsh plant communities on this floodplain, based on estimates from regional studies of marshes dominated by less recalcitrant species. We concluded that restored floodplain wetlands can contribute significant amounts of organic matter to the estuarine ecosystem and thereby contribute to the restoration of historical trophic structure.

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  • The direct effects of reconnection on hydrology and sedimentation in turn produce indirect effects on native plants and the aquatic food web.

    “The direct effects of reconnection on hydrology and sedimentation in turn produce indirect effects on native plants and the aquatic food web (Thom et al. 2018).”

    From Applying cumulative effects to strategically advance large‐scale ecosystem restoration (2021) · cites this paper as Thom et al. 2018

    The Accepted Article passages (page unavailable) report that reconnection restored water-level variations, that sediment accretion helped restore marsh elevation and vegetation structure, and that vegetation changed after reconnection. They also describe exported organic matter as a potential contribution to the aquatic food web, but say further research is needed to establish how it is taken up. The paper does not establish the claimed effects on native plants or a demonstrated food-web response. (LLM, conf=0.86)

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2 of the 64 references couldn’t be matched to a known paper.

Research works printed but not linked: 5

  1. Collins, L. M., J. N. Collins, and L. B. Leopold. 1987. Geomorphic processes of an estuarine marsh. Pages 1049-1072 in V. Gardiner (ed.), International Geomorphology 1986: Part I. Proceedings of the First International Conference on Geomorphology.
  2. Mitsch W. J. and J. G. Gosselink. 2007. Wetlands, 4th ed. Hoboken, NJ: Wiley.
  3. Odum, W. E. 1984. Dual-gradient concept of detritus transport and processing in estuaries. Bulletin of Marine Science 35:510-521.
  4. Odum, W. E. and E. J. Heald. 1975. The detritus-based food web of an estuarine mangrove community. In Estuarine Research, Vol. 1, ed. L.E. Cronin, 265-286. New York: Academic Press.
  5. Summerhayes, V. S., and C. S. Elton. 1923. Contributions to the ecology of Spitsbergen and Bear Island. Journal of Ecology 11:214-286.

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Authors
Thom, R. M., Breithaupt, S. A., Diefenderfer, H. L., Borde, A. B., Roegner, G. C., Johnson, G. E., & Woodruff, D. L.
Affiliations
  • Pacific Northwest National Laboratory (US)
  • NOAA National Marine Fisheries Service (US)
Corresponding author
Diefenderfer, Heida L.
Venue
Ecological Applications
Publisher
Wiley
Published
2018-07-23
Volume
28
Issue
6
Pages
1420-1434
ISSN
  • 1051-0761 (ISSN-L)
  • 1939-5582
OpenAlex
W2884180961
Cited by
27
References
64
Citations by year
2026: 3 · 2025: 7 · 2024: 2 · 2023: 2 · 2022: 2 · 2021: 5 · 2020: 5 · 2019: 1
FWCI
2.07
Type
journal article
Language
en
Open access
Locations
  • Ecological Applications (publishedVersion)
  • PubMed (publishedVersion)
  • OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
  • NOAA Institutional Repository (submittedVersion, public-domain)
Funders
U.S. Army Corps of Engineers
Topics
  • Physical Sciences › Environmental Science › Ecology › Coastal wetland ecosystem dynamics
  • Physical Sciences › Environmental Science › Ecology › Hydrology and Sediment Transport Processes
  • Physical Sciences › Earth and Planetary Sciences › Oceanography › Marine and coastal ecosystems
Keywords
particulate organic matter flux, tidal marsh restoration, estuarine food webs, reed canary grass, Columbia River estuary, tidal exchange
MeSH terms
Northwestern United States, Particulate Matter, Wetlands, Estuaries

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