The Amazon-influenced muddy coast of South America: A review of mud-bank–shoreline interactions

Anthony, Edward J.; Gautier, Antoine; Gratiot, Nicolas; Proisy, Christophe; Allison, Mead A.; Dolique, Franck; Fromard, François

doi:10.1016/j.earscirev.2010.09.008

Cited by 199 publications

(148 citation statements)

References 103 publications

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“…Highly mobile mudbanks extend for more than 1,500 km along the northeast coast of South America between the mouths of the Amazon and Orinoco Rivers. The mudbanks migrate alongshore, protected from wave attack by the dampening effect of mud, and are colonized by mangroves, which are subsequently overwhelmed by a further phase of mudbank instability (Fromard et al 2004, Anthony et al 2010. In some locations, the dynamics of the mangrove fringe appear to be related to the 18.6-year cycle of highest tides (Gratiot et al 2008).…”

Section: Wwwannualreviewsorg • Mangrove Sedimentation and Sea Levelmentioning

confidence: 96%

Mangrove Sedimentation and Response to Relative Sea-Level Rise

Woodroffe

Rogers

McKee

et al. 2016

Annu. Rev. Mar. Sci.

359

285

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Mangroves occur on upper intertidal shorelines in the tropics and subtropics. Complex hydrodynamic and salinity conditions, related primarily to elevation and hydroperiod, influence mangrove distributions; this review considers how these distributions change over time. Accumulation rates of allochthonous and autochthonous sediment, both inorganic and organic, vary between and within different settings. Abundant terrigenous sediment can form dynamic mudbanks, and tides redistribute sediment, contrasting with mangrove peat in sediment-starved carbonate settings. Sediments underlying mangroves sequester carbon but also contain paleoenvironmental records of adjustments to past sea-level changes. Radiometric dating indicates long-term sedimentation, whereas measurements made using surface elevation tables and marker horizons provide shorter perspectives, indicating shallow subsurface processes of root growth and substrate autocompaction. Many tropical deltas also experience deep subsidence, which augments relative sea-level rise. The persistence of mangroves implies an ability to cope with moderately high rates of relative sea-level rise. However, many human pressures threaten mangroves, resulting in a continuing decline in their extent throughout the tropics.

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Section: Wwwannualreviewsorg • Mangrove Sedimentation and Sea Levelmentioning

confidence: 96%

Mangrove Sedimentation and Response to Relative Sea-Level Rise

Woodroffe

Rogers

McKee

et al. 2016

Annu. Rev. Mar. Sci.

359

285

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“…This lack of site replication along the Guianese coast prevents any extrapolation of our results at the littoral scale; they are thus cautiously inferred from the scope of the data hereafter. Nevertheless, comparable patterns may be expected in other areas along the shore under Amazonian influence (1500 km long) because it exhibits monotonous vegetation and sedimentary characteristics, being largely dominated by the tree Avicennia germinans (L.) Stearn and mud (Fromard et al, 1998;Anthony et al, 2010). This hypothesis needs to be confirmed by replicating sites as soon as they are accessible in further studies.…”

Section: Spatial Limitationsmentioning

confidence: 94%

“…This question will be addressed in this study, in the early stages of the mangroves in French Guiana, which have specific dynamics compared to other mangroves in the world. The Guianese coast is indeed a unique entity, subjected to successive phases of massive suspended sediment discharge from the Amazon River and sediment erosion (Anthony et al, 2010). Mangrove dynamics follow the newly formed mud banks along the coast, with mangroves colonizing rapidly as soon as the mud is sufficiently consolidated (Fromard et al, 2004;Proisy et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Bioturbation functional roles associated with mangrove development in French Guiana, South America

et al. 2017

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in : http://oatao.univ-toulouse.fr/ Eprints ID : 17613 Any correspondence concerning this service should be sent to the repository administrator: staff-oatao@listes-diff.inp-toulouse.fr Abstract This study aims to qualify, quantify, and compare the sediment reworking rates induced by the meso-(0.25-1 mm) and macro-infauna ([1 mm) along a mangrove growth gradient in the sedimentary dynamics of the French Guiana coast. The characterization of the role of small-infauna bioturbation in mangroves is new despite their known numerical dominance in tropical environments. Bare sediment, pioneer mangroves, and young mangroves were investigated during the dry season and spring tide to characterize their environment, infaunal functional community structure and sediment reworking rates. The biodiffusion differed significantly between mangrove stages, co-varying mainly with density and functional richness. On the contrary, the non-local transport remained similar, despite the mangrove-agespecificity of infauna functional compositions, which responded to modifications in the nature and content of organic matter. The first mangrove infaunal functional sequence is described: organisms that first colonize deposited mud generate the maximum biodiffusive mixing and induce a total downward particle flux (BDF) as high as in the young mangroves; in the pioneer mangroves, the infauna variables and BDF are stressed to minimum values. Our study sheds light on the functional contribution of the small infauna in a mangrove coastal area and quantifies its role in particle transport during mangrove development.

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“…As stated by Green and Coco [158], "estuarine intertidal flats are excellent natural laboratories that offer opportunities for working on a number of fundamental problems in sediment transport". Fluidization of marine mud by waves [159] is a key factor for fluid mud dynamics and for the formation and migration of mud banks (e.g., [160][161][162]). Studies focus as well on hydrosedimentary processes in mangroves, which play a key role in wave attenuation and sediment trapping in muddy coasts [163].…”

Section: Cohesive Sedimentsmentioning

confidence: 99%

Why and How Do We Study Sediment Transport? Focus on Coastal Zones and Ongoing Methods

Ouillon

2018

Water

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Scientific research on sediment dynamics in the coastal zone and along the littoral zone has evolved considerably over the last four decades. It benefits from a technological revolution that provides the community with cheaper or free tools for in situ study (e.g., sensors, gliders), remote sensing (satellite data, video cameras, drones) or modelling (open source models). These changes favour the transfer of developed methods to monitoring and management services. On the other hand, scientific research is increasingly targeted by public authorities towards finalized studies in relation to societal issues. Shoreline vulnerability is an object of concern that grows after each marine submersion or intense erosion event. Thus, during the last four decades, the production of knowledge on coastal sediment dynamics has evolved considerably, and is in tune with the needs of society. This editorial aims at synthesizing the current revolution in the scientific research related to coastal and littoral hydrosedimentary dynamics, putting into perspective connections between coasts and other geomorphological entities concerned by sediment transport, showing the links between many fragmented approaches of the topic, and introducing the papers published in the special issue of Water on "Sediment transport in coastal waters".

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The Amazon-influenced muddy coast of South America: A review of mud-bank–shoreline interactions

Cited by 199 publications

References 103 publications

Mangrove Sedimentation and Response to Relative Sea-Level Rise

Mangrove Sedimentation and Response to Relative Sea-Level Rise

Bioturbation functional roles associated with mangrove development in French Guiana, South America

Why and How Do We Study Sediment Transport? Focus on Coastal Zones and Ongoing Methods

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