Seagrass impact on sediment exchange between tidal flats and salt marsh, and the sediment budget of shallow bays
Ganju, Neil K.
MetadataShow full item record
Seagrasses are marine flowering plants that strongly impact their physical and biological surroundings and are therefore frequently referred to as ecological engineers. The effect of seagrasses on coastal bay resilience and sediment transport dynamics is understudied. Here we use six historical maps of seagrass distribution in Barnegat Bay, USA, to investigate the role of these vegetated surfaces on the sediment storage capacity of shallow bays. Analyses are carried out by means of the Coupled‐Ocean‐Atmosphere‐Wave‐Sediment Transport (COAWST) numerical modeling framework. Results show that a decline in the extent of seagrass meadows reduces the sediment mass potentially stored within bay systems. The presence of seagrass reduces shear stress values across the entire bay, including unvegetated areas, and promotes sediment deposition on tidal flats. On the other hand, the presence of seagrasses decreases suspended sediment concentrations, which in turn reduces the delivery of sediment to marsh platforms. Results highlight the relevance of seagrasses for the long‐term survival of coastal ecosystems, and the complex dynamics regulating the interaction between subtidal and intertidal landscapes.
Author Posting. © American Geophysical Union, 2018. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 45 (2018): 4933-4943, doi:10.1029/2018GL078056.
Suggested CitationArticle: Donatelli, Carmine, Ganju, Neil K., Fagherazzi, Sergio, Leonardi, Nicoletta, "Seagrass impact on sediment exchange between tidal flats and salt marsh, and the sediment budget of shallow bays", Geophysical Research Letters 45 (2018): 4933-4943, DOI:10.1029/2018GL078056, https://hdl.handle.net/1912/10440
Showing items related by title, author, creator and subject.
Natural-abundance radiocarbon as a tracer of assimilation of petroleum carbon by bacteria in salt marsh sediments Wakeham, Stuart G.; McNichol, Ann P.; Kostka, Joel E.; Pease, Tamara K. (2005-12-29)The natural abundance of radiocarbon (14C) provides unique insight into the source and cycling of sedimentary organic matter. Radiocarbon analysis of bacterial phospholipid lipid fatty acids (PLFAs) in salt-marsh sediments ...
Nutrient enrichment induces dormancy and decreases diversity of active bacteria in salt marsh sediments Kearns, Patrick J.; Angell, John H.; Howard, Evan M.; Deegan, Linda A.; Stanley, Rachel H. R.; Bowen, Jennifer L. (Nature Publishing Group, 2016-09-26)Microorganisms control key biogeochemical pathways, thus changes in microbial diversity, community structure and activity can affect ecosystem response to environmental drivers. Understanding factors that control the ...
Salt marsh sediment bacterial communities maintain original population structure after transplantation across a latitudinal gradient Angermeyer, Angus; Crosby, Sarah C.; Huber, Julie A. (PeerJ, 2018-05-01)Dispersal and environmental selection are two of the most important factors that govern the distributions of microbial communities in nature. While dispersal rates are often inferred by measuring the degree to which community ...