Marsh expansion at Calaveras Point Marsh, South San Francisco Bay, California

Watson, E. B.

doi:10.1016/j.ecss.2008.02.008

Cited by 16 publications

(7 citation statements)

References 34 publications

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“…3a), partly as isolated clumps of pioneer plants, and far to the northeast had spread outward to the channel of Cake Pill on the mudflat. As in similar situations in San Francisco Bay (Watson 2008), the advancing edge at Cake Pill and Old Passage was very ragged, as the pioneer vegetation was restricted to the barely perceptible levees of the many small gullies that drained across the mudflat (Fig. 3b).…”

Section: Low Marsh (Northwick Formation)mentioning

confidence: 63%

Salt-marsh evolution at Northwick and Aust warths, Severn Estuary, UK: a case of constrained autocyclicity.

Haslett

Allen

2014

atgeol

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Historic maps, remote imagery and field surveys reveal that a terraced sequence of four salt marshes has arisen on a decadal-centennial time-scale over a frontage of about 4 km at Northwick and Aust warths exposed to westerly to northerly winds on the east bank of the Severn Estuary, UK. Except for the youngest marsh, at present very immature, each marsh built up through differential sedimentation from a mudflat until the outer zone reached a critical steepness; at that point wave-attack caused erosion that led to the rapid landward retreat of a bold, laterally extensive, marsh-edge cliff. This observed behaviour is consistent with previous models of autocyclic marshes, but evidence suggests that the extrinsic factor of medium-scale changes in wind-wave climate constrained the particular timing of marsh responses. rÉSUMÉ Selon les cartes historiques, les images satellites et les études sur le terrain, une suite de quatre marais salés s' élevant en étages est apparue à une échelle de temps décennale et centennale. Ces marais s' étendent sur environ 4 km entre Northwick et Aust warths, au Royaume-Uni, et sont exposés à des vents de l' ouest, du nord-ouest et du nord sur la rive est de l'estuaire de la Severn. À l' exception du marais le plus récent, qui se trouve actuellement à un stade de développement très peu avancé, chacun de ces marais s' est formé grâce à la sédimentation différentielle d'une vasière. Leur périmètre latéral consiste en une falaise abrupte que l' érosion des vagues a rapidement fait reculer vers le continent. L'évolution observée concorde avec les anciens modèles de fonctionnement autocyclique des marais, mais des signes tendent à indiquer que le facteur extrinsèque du changement à moyenne échelle des conditions liées à la mer du vent a restreint le développement de ces systèmes. Salt-marsh evolution at Northwick and Aust warths, Severn Estuary[Traduit par la redaction]

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Section: Low Marsh (Northwick Formation)mentioning

confidence: 63%

Salt-marsh evolution at Northwick and Aust warths, Severn Estuary, UK: a case of constrained autocyclicity.

Haslett

Allen

2014

atgeol

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“…Interestingly, the significant effect of species identity on seedling demographics with a 2 d disturbance‐free period in our CS and IS treatment groups shows that S. anglica requires shorter WO than S. alterniflora . This may explain the highly successful global invasion of S. anglica (Watson ).…”

Section: Discussionmentioning

confidence: 99%

“…However, when facing high rates of changes in the seascape, time may be limited for geomorphological adjustment of tidal flats (Mariotti and Fagherazzi ; Fagherazzi, et al ; Suykerbuyk et al ). Thus, in order to (re)create salt marshes for long‐term sustainable coastal protection under global change (Temmerman et al ; Bouma et al ), it is key to consider both present and estimated future sedimentation regimes before considering restoration projects, and where necessary, to engineer the site conditions to create—at least temporarily—disturbance‐free periods that enable the primary establishment of pioneer species (Adam ; Watson ; Bouma et al ). For example, engineering measures that can either temporarily reduce disturbances (e.g., reduce hydrodynamic forces, sediment dynamics or negative biotic interactions) or stabilize substrate for settlement, might offer useful ways to provide WO for marsh seedling establishment (Bouma et al ).…”

Section: Discussionmentioning

confidence: 99%

Effects of sediment disturbance regimes onSpartinaseedling establishment: Implications for salt marsh creation and restoration

Cao

Zhu

Balke

et al. 2017

Limnology & Oceanography

155

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Seedling establishment is an important process relevant for the restoration of salt marsh within the framework of sustainable coastal defense schemes. Recent studies have increasingly highlighted how the short-term (i.e., the day-to-day) sediment dynamics can form major bottlenecks for seedling establishment. Until recently, studies on quantifying the threshold values of such short-term sediment dynamics for marsh seedlings remain rare. As accretion/erosion trends and dynamics may differ greatly under global change, we study the effects of short-term sediment disturbance-regimes on seedling establishment of two globally distributed foundation species: Spartina alterniflora and Spartina anglica. Seedlings with different disturbance-free periods were exposed to a set of different accretion/erosion-regimes in the laboratory. Seedling survival appeared to be much more sensitive to erosion than accretion, seedlings with short disturbance-free periods were more sensitive than seedlings with longer ones, and S. alterniflora was more sensitive than S. anglica. Seedlings were less sensitive to gradual changes in sediment height (accretion/erosion) than to abrupt changes where time for morphological adjustment is lacking. Critical erosion depth (the maximum erosion that seedlings are able to withstand) was shown to mainly depend on sedimentation history. Our results confirm that the establishment of Spartina seedlings requires a flooding disturbance-free "window of opportunity" and that sediment disturbances affect their survival both directly and via morphological adjustment. These results provide fundamental insights into seedling establishment that can be used for designing engineering measures to create suitable conditions and enable marsh creation/restoration for nature goals or as part of coastal defense schemes under global change.

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“…Accretion was measured in the experiment based on the depth of sedimentation plates (French and Burningham, 2003;Watson, 2008;Nolte et al, 2013a). We measured a total of 96 plates.…”

Section: Accretionmentioning

confidence: 99%

Effects of livestock species and stocking density on accretion rates in grazed salt marshes

Nolte

Esselink

Bakker

et al. 2015

Estuarine, Coastal and Shelf Science

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Marsh expansion at Calaveras Point Marsh, South San Francisco Bay, California

Cited by 16 publications

References 34 publications

Salt-marsh evolution at Northwick and Aust warths, Severn Estuary, UK: a case of constrained autocyclicity.

Salt-marsh evolution at Northwick and Aust warths, Severn Estuary, UK: a case of constrained autocyclicity.

Effects of sediment disturbance regimes onSpartinaseedling establishment: Implications for salt marsh creation and restoration

Effects of livestock species and stocking density on accretion rates in grazed salt marshes

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