Sedimentation within and among mangrove forests along a gradient of geomorphological settings

Adame, María, Neil, David, Wright, Sara F. and Lovelock, Catherine E. (2010) Sedimentation within and among mangrove forests along a gradient of geomorphological settings. Estuarine Coastal and Shelf Science, 86 1: 21-30. doi:10.1016/j.ecss.2009.10.013

Author Adame, María
Neil, David
Wright, Sara F.
Lovelock, Catherine E.
Title Sedimentation within and among mangrove forests along a gradient of geomorphological settings
Journal name Estuarine Coastal and Shelf Science   Check publisher's open access policy
ISSN 0272-7714
Publication date 2010-01-01
Year available 2009
Sub-type Article (original research)
DOI 10.1016/j.ecss.2009.10.013
Volume 86
Issue 1
Start page 21
End page 30
Total pages 10
Editor D. S. McClusky
E. Wolanski
I. Valiela
Place of publication London, England
Publisher Academic Press
Collection year 2010
Language eng
Subject C1
0501 Ecological Applications
0502 Environmental Science and Management
960802 Coastal and Estuarine Flora, Fauna and Biodiversity
Abstract Coastal wetlands provide important ecological services to the coastal zone, one of which is sediment retention. In this study we investigated sediment retention across a range of geomorphological settings and across vegetation zones comprising coastal wetlands. We selected six coastal wetlands dominated by mangroves over a gradient from riverine to tidal settings in Southeast Queensland, Australia. Each site was comprised of three distinct vegetation communities distributed as parallel zones to the coast line: seaward fringe mangroves, landward scrub mangroves and saltmarsh/ cyanobacteria mat of the high intertidal zone. We measured suspended sediment retention and sedimentation rates. Additionally, in order to assess the origin of sediment transported and deposited in the mangroves, glomalin, a novel terrestrial soil carbon tracer, was used. Our results show a mean average sedimentation of 0.64 ± 0.01 mg cm−2 spring tide−1, which was variable within sites, regardless of geomorphological setting. However, geomorphological setting influenced spatial patterns of sediment deposition. Riverine mangroves had a more homogeneous distribution of sediments across the intertidal zone than tidal mangroves, where most sedimentation occurred in the fringe zone. Overall, the fringe zone retained the majority of sediment entering the coastal wetland during a tidal cycle with 0.90 ± 0.22 mg cm−2 spring tide−1, accounting for 52.5 ± 12.5% of the total sedimentation. The presence of glomalin in suspended sediments, and thus the relative importance of terrigenous sediment, was strongly influenced by geomorphological setting, with riverine mangroves receiving more glomalin in suspended solids than tidal mangroves. Glomalin was also differentially deposited within the vegetation zones at different geomorphological settings: primarily at the fringe zone of tidal mangroves and within the scrub zone of riverine mangroves. The differences we observed in the spatial distribution of sedimentation and the difference in the origin of the sediment deposited in riverine and tidal mangroves are likely to have an impact on ecological processes.
Keyword glomalin
terrigenous sediments
Southeast Queensland
27 degrees 30 ' N, 153 degrees 10 ' E
Arbuscular Mycorrhizal Fungi
Soil protein
Salt Marshes
Q-Index Code C1
Q-Index Status Confirmed Code

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Created: Sun, 31 Jan 2010, 00:04:09 EST