https://www.coastalwiki.org/w/index.php?title=Spatial_and_temporal_variability_of_salt_marshes&feed=atom&action=historySpatial and temporal variability of salt marshes - Revision history2024-03-28T17:43:12ZRevision history for this page on the wikiMediaWiki 1.31.7https://www.coastalwiki.org/w/index.php?title=Spatial_and_temporal_variability_of_salt_marshes&diff=80125&oldid=prevDronkers J at 16:54, 7 March 20232023-03-07T16:54:12Z<p></p>
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</table>Dronkers Jhttps://www.coastalwiki.org/w/index.php?title=Spatial_and_temporal_variability_of_salt_marshes&diff=80092&oldid=prevDronkers J at 14:49, 2 March 20232023-03-02T14:49:17Z<p></p>
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</table>Dronkers Jhttps://www.coastalwiki.org/w/index.php?title=Spatial_and_temporal_variability_of_salt_marshes&diff=78378&oldid=prevDronkers J at 16:37, 24 November 20202020-11-24T16:37:58Z<p></p>
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</table>Dronkers Jhttps://www.coastalwiki.org/w/index.php?title=Spatial_and_temporal_variability_of_salt_marshes&diff=78189&oldid=prevDronkers J: Created page with " {|Width = "100%" | style="padding:2px 0px 0px 0px"|image:Saefringhe NIOO-CEME.jpg|left|thumb|250px|caption|Figure 1: Example of a salt-marsh: Land of Saeftinghe - Belgium..."2020-09-20T10:30:50Z<p>Created page with " {|Width = "100%" | style="padding:2px 0px 0px 0px"|image:Saefringhe NIOO-CEME.jpg|left|thumb|250px|caption|Figure 1: Example of a salt-marsh: Land of Saeftinghe - Belgium..."</p>
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==Introduction==<br />
A [[Salt_marshes | salt marsh]] (Figure 1) is a tidal wetland in the upper coastal intertidal zone between salty or brackish water. They replace [[mangroves]] in temperate and arctic regions. Their flora is dominated by [[Halophytic_plants |halophytic]] (salt-tolerant) vegetation (Adam, 1990 <ref>Adam P., 1990. ''Saltmarsh Ecology''. Cambridge University Press, New York.</ref>), such as grasses, shrubs and herbs <ref name= "Salt marsh">[[Salt_marshes]]</ref>. The sediment consists of [[mud]] and sand. Salt marshes are normally associated with [[Tidal flats from space|mud flats]], these mud flats are sometimes dominated by [[algae]]. However, salt marshes can also occur on sand flats<ref name= "Salt marsh"/>. </br><br />
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Salt marshes are regularly subjected to tidal movement and wave action. Tidal channels control the drainage of this seawater and allow [[detritus]], dissolved [[nutrients]], [[plankton]] and small fishes to be flushed in and out the salt marshes<ref name="Salt marsh"/>. Salt marshes protect the lowlands from marine flooding by damping storm and waves and by slowing flows pushing inland (Allen, 2000<ref>Allen, J.R.L., 2000. Morphodynamics of Holocene salt marshes: a review sketch from the Atlantic and Southern North Sea coasts of Europe. ''Quaternary Science Reviews''. '''19(12)''', pp. 1155-1231.</ref>). </br><br />
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The total number and area of salt marshes have been declining for many years. The main cause is enclosure, which removes the habitat from tidal inundation<ref name="Salt marsh"/>. Another problem, especially across Europe, is lateral erosion which leads to a loss of salt-marsh habitat. ([[Natural shore protecting barriers#Salt_marshes|More info]]) <br />
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[[Image: Figure_salt-marsh_zonation.JPG|thumb|center|450px|Figure 2: Typical salt marsh zonation (modified from Bertness ''et al.'', 2002 <ref name="Bertness"/>). Species along the tidal elevation gradient are adapted to the inundation frequency, including extreme flooding and storm events.]]<br />
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==European-scale distribution of salt marshes==<br />
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===Species composition and zonation of marsh vegetation===<br />
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Species compositions of vegetation communities are governed by species’ ability to compete and their tolerance to site‐specific environmental conditions and physical disturbance (Grime 1979 <ref> GRIME J.P., 1979. Plant Strategies, vegetation processes, and ecosystem properties. J. Wiley & Sons, Chichester.</ref>). Most classification schemes recognize five vegetation zones in salt‐marshes along the vertical gradient in seawater exposure (inundation frequency) (Figure 2). To some degree, this vertical [[zonation]] reflects a general decline from the low to high elevations in the tolerance of species to seawater flooding (Allen 2000<ref name="Allen"> ALLEN J.R.L., 2000. Morphodynamics of Holocene salt marshes: a review sketch from the Atlantic and Southern North Sea coasts of Europe. ''Quaternary Science Reviews''. '''19''', 1155‐1231.</ref>). Thus, the grazing-marsh above the intertidal zone has less predominance of salinity‐tolerant species than the salt marsh. However, the predictable vertical alignment of species along the salinity gradient is strongly modified by the species’ competitive abilities, as well as their tolerances to site‐specific conditions, including tidal range and climate (e.g. rainfall), as well as [[salinity]], [[nutrient]] and disturbance (e.g. waves or grazing) regimes (Allen 2000<ref name="Allen"/>; Bertness ''et al.'', 2002 <ref name="Bertness"> Bertness, M.D., Ewanchuk, P.J., 2002. Latitudinal and climate-driven variation in the strength and nature of biological interactions in New England salt marshes. ''OECOLOGIA''. '''132''', 392-401.</ref>). For instance, intense grazing disturbance may cause less competitively strong mid‐marsh species to become more common in the high marsh (Kiehl ''et al.'' 1996 <ref>KIEHL K., EISCHEID I., GETTNER S., WALTER J., 1996. Impact of different sheep grazing intensities on salt-marsh vegetation in northern Germany. ''Journal of Vegetation Science''. '''7''', 99–106. </ref>). Traits for competition, environmental and disturbance tolerance often exist in trade-off. Thus, while competitive fitness generally increases up‐shore, some low marsh species compensate for lack of competitive ability by being more tolerant to wave disturbance than high shore species (Pennings and Calloway 1992 <ref>PENNINGS S.C., CALLOWAY R.M., 1992. Salt marsh plant zonation: the relative importance of competition and physical factors. ''Ecology'', '''73''': 681‐690.</ref>).<br />
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[[Image: Salt marshes across Europe.JPG|thumb|right|250px| Figure 3: Salt marshes across Europe divided to regional type: (red) Baltic and boreal, (yellow) North Atlantic, (blue) South Atlantic, and (purple) Mediterranean.]]<br />
===European salt‐marsh distribution and vegetation composition===<br />
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Although salt‐marshes are not the most diverse [[Ecosystems|ecosystems]], due to the influence of the salinity regime, they are highly productive. Along the European coasts salt‐marsh vegetation composition<br />
differs between four regions (Figure 3) from which a large area is protected within Natura 2000: 1) North Atlantic; 2) South Atlantic; 3) Mediterranean; 4) Baltic and Boreal regions (European Commission, 2007<ref>EUROPEAN COMMISSION, 2007. Interpretation Manual of European Union Habitats‐EUR27.</ref>). A short description of these regional vegetation differences in vegetation composition is given in Table 1, Table 2 and Table 3. In general the salt marshes in North-West Europe can be considered to belong to the North Atlantic. In contrast to the other types, these marshes are mostly exposed to large tidal amplitudes. In general the salt marshes and meadows along the [[Baltic Sea]] experience minimal tidal differences, and can be considered micro-tidal. Most of the Baltic and boreal coastal areas were traditionally used for mowing or grazing, thus enlarging the areas and keeping the vegetation low, rich in vascular plants, characteristically the vegetation occurs in distinct zones, with saline vegetation closest to the sea. The Mediterranean and South Atlantic coastal areas consist largely of the same species composition. This is due to the temperature, although Mediterranean species higher up on the shore are usually more dessication resistant. In general the salt marshes and meadows along the Mediterranean experience minimal tidal differences, and can be considered micro‐tidal.</br><br />
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{| border="1" cellspacing="0" width="600px" style="margin: 1em auto 1em auto;"<br />
|+ <span style="Font-size: 120%">'''Table 1: North Atlantic salt-marshes.'''</span><br />
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| colspan="2" style="text-align: left;" |<span class="plainlinks"> '''''Salicornia'' spp. and other annuals colonizing mud and sand''' ([http://eunis.eea.europa.eu/habitats/10018 PAL.CLASS.:15.1,1310]):<br />
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|-<br />
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| align=”left”| Glasswort swards (Thero-Salicornietalia): annual glasswort (''[http://www.marinespecies.org/aphia.php?p=taxdetails&id=403903 Salicornia spp.]'', ''Microcnemum coralloides''), seablite (''[http://www.marinespecies.org/aphia.php?p=taxdetails&id=425938 Suaeda maritima]''), or sometimes saltwort (''[http://www.marinespecies.org/aphia.php?p=taxdetails&id=415952 Salsola spp]''.) formations colonizing periodically inundated muds of coastal salt marshes and inland salt‐basins.<br />
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| align=”left”| Mediterranean halo-nitrophilous pioneer communities (''Frankenion pulverulentae''): formations of halo‐nitrophilous annuals (''Frankenia pulverulenta'', ''Suaeda splendens'', ''Salsola soda'', ''Cressa cretica'', ''Parapholis incurva'', ''P. strigosa'', ''Hordeum marinum'', ''Sphenopus divaricatus'') colonizing salt muds of the Mediterranean region, susceptible to temporary inundation and extreme drying.<br />
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| align=”left”| Atlantic sea‐pearlwort communities (''Saginion maritimae''): formations of annual pioneers occupying sands subject to variable salinity and humidity, on the coasts, in dune systems and salt marshes. They are usually limited to small areas and best developed in the zone of contact between dune and salt marsh.<br />
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| align=”left”| Central Eurasian crypsoid communities : Sparse solonchak formations of annual grasses of genus ''Crypsis'' (''Heleochloa'') colonizing drying muds of humid depressions of the salt steppes and saltmarshes (15.A) of Eurasia, from Pannonia to the Far East.<br />
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|colspan="2" style="text-align: left;" |<span class="plainlinks">'''''Spartina swards'' (''Spartinion maritimae'')''' ([http://eunis.eea.europa.eu/habitats/10019/general PAL.CLASS.: 15.2, 1320]). Perennial pioneer grasslands of coastal salt muds are formed by Spartina or similar grasses. When selecting sites, preference should be given to those areas supporting rare or local Spartina. Sub-types are:<br />
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|Flat‐leaved cordgrass swards: perennial pioneer grasslands of coastal salt muds, dominated by flat-leaved ''Spartina maritima'', ''[http://www.marinespecies.org/aphia.php?p=taxdetails&id=234041 S. townsendii]'', ''S. anglica, [http://www.marinespecies.org/aphia.php?p=taxdetails&id=234072 S. alterniflora]''. <br />
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|Rush‐leaved cordgrass swards: perennial pioneer grasslands of southern Iberian coastal salt muds, dominated by the junciform‐leaved ''[http://www.marinespecies.org/aphia.php?p=taxdetails&id=394827 Spartina densiflora]''. <br />
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| colspan="2" style="text-align: left;" |<span class="plainlinks">'''Atlantic salt meadows (''Glauco-Puccinellietalia maritimae'')''' ([http://eunis.eea.europa.eu/habitats/10020/general PAL.CLASS.: 15.3, 1330])<br />
|}<br />
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{| border="1" cellspacing="0" width="600px" style="margin: 1em auto 1em auto;"<br />
|+ <span style="Font-size: 120%">'''Table 2: Mediterranean and South Atlantic salt-Marshes.'''</span><br />
| colspan="2" style="text-align: left;" |<span class="plainlinks">'''Mediterranean salt meadows (''Juncetalia maritime'')''' ([http://eunis.eea.europa.eu/habitats/10023/general PAL.CLASS.: 15.5, 1410])<br />
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|Tall rush (''[http://www.marinespecies.org/aphia.php?p=taxdetails&id=426076 Juncus maritimus]'' and/or ''[http://www.marinespecies.org/aphia.php?p=taxdetails&id=394966 J. acutus]'') dominated salt<br />
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|Short rush, sedge and clover saltmarshes (''Juncion maritimi'') and humid meadows behind the littoral, rich in annual plant species and in Fabacea (''Trifolion squamosi'') <br />
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|Mediterranean halo-psammophile meadows (''Plantaginion crassifoliae'')<br />
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|Iberian salt meadows (''Puccinellion fasciculatae'') <br />
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|Halophilous marshes along the coast and the coastal lagoons (''Puccinellion festuciformis'')<br />
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|Humid halophilous moors with the shrubby stratum dominated by ''Artemisia Coerulescens''<br />
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|colspan="2" style="text-align: left;" |<span class="plainlinks">'''Mediterranean and thermo‐Atlantic halophilous scrubs (''Sarcocornetea fruticosi'')''' ([http://eunis.eea.europa.eu/habitats/10024/general PAL.CLASS.: 15.6, 1420]). Perennial vegetation of marine saline muds mainly composed of scrub, essentially with a Mediterranean‐Atlantic distribution<br />
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|colspan="2" style="text-align: left;" |<span class="plainlinks">'''Halo‐nitrophilous scrubs (''Pegano-Salsoletea'')''' ([http://eunis.eea.europa.eu/habitats/10025 PAL.CLASS.: 15.72, 1430]), Halo-nitrophilous scrubs (matorrals) belonging to the Pegano-Salsoletea class, typical of dry soils under arid climates, sometimes including taller, denser bushes. <br />
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|colspan="2" align=”right” | <span class="plainlinks">'''Mediterranean salt steppes (''Limonietalia'')''' ([http://eunis.eea.europa.eu/habitats/10027/general PAL.CLASS.: 15.8, 1510])<br />
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{| border="1" cellspacing="0" width="600px" style="margin: 1em auto 1em auto;"<br />
|+ <span style="Font-size: 120%">'''Table 3: Boreal and Baltic salt-marshes.'''</span><br />
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| style="text-align: left;" |''Agrostis stolonifera, Blysmus rufus, [http://www.marinespecies.org/aphia.php?p=taxdetails&id=416203 Bolboschoenus maritimus], Calamagrostis stricta, Carex nigra, [http://www.marinespecies.org/aphia.php?p=taxdetails&id=577503 C. paleacea], Centaurium littorale, C. pulchellum, [http://www.marinespecies.org/aphia.php?p=taxdetails&id=577518 Eleocharis uniglumis], E. parvula, [http://www.marinespecies.org/aphia.php?p=taxdetails&id=431962 Festuca rubra], [http://www.marinespecies.org/aphia.php?p=taxdetails&id=394967 Juncus gerardii], Odontites litoralis, Ophioglossum vulgatum, Plantago maritima.''<br />
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==Examples of temporal variability==<br />
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Salt marshes can show large spatial and temporal variability. Due to the interaction of hydrodynamic forces and vegetation‐sedimentation feedbacks, complex patterns of marsh establishment, development and destruction can occur at the same time spread across the marsh. Moreover, salt-marshes can go through cycles of large-scale marsh build-up alternated with lateral erosion resulting in a spatial shift of the leading vegetation edge and eroding cliff in time. Consequently, it will be a challenge to separate development trends in salt-marsh extant caused by environmental changes, by e.g. [[climate change]] and [[sea level rise]], from changes due to the natural variability of this ecosystem.</br><br />
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{|style="margin: 1em auto 1em auto;"<br />
|[[Image: Spatiotemporal development.JPG|thumb|329heightpx| Figure 4: Spatiotemporal development of eight salt marshes along the Scheldt-estuary (figure taken from van der Wal ''et al.'', 2008<ref name="Van de Wal"/>).]] <br />
|[[Image: Spatio-temporal dynamics.JPG|thumb|300heightpx| Figure 5: The Spatio-temporal dynamics of salt marsh vegetation at Jiuduansha sands.]]<br />
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</br><br />
===Case study 1: Salt marshes along the Western Scheldt, Netherlands ===<br />
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Recently the spatiotemporal variability of eight salt marshes along the Scheldt estuary have been investigated (Figure 4, van der Wal., et al 2008 <ref name="Van de Wal">VAN DER WAL D., WIELEMAKER-VAN DEN DOOL A., HERMAN P.M.J., 2008. Spatial patterns, rates and mechanisms of saltmarsh cycles (Westerschelde, The Netherlands). ''Estuarine, Coastal and Shelf Science''. '''76''', 357-368. Available from: [http://www.vliz.be/imis/imis.php?module=ref&refid=143078 www.vliz.be/imis]</ref>). The study revealed the significance of intrinsic processes in salt marsh development, and the necessity to consider the local feedback mechanisms between plant growth, [[morphology]] and hydrodynamics of both the salt marsh and the [[mudflat]], when assessing the status of salt marshes. Furthermore, the importance of assessing salt marsh changes in a spatial context is highlighted, rather than looking at changes in total salt marsh area. Most salt marshes showed simultaneous expansion of ''Spartina anglica'' tussocks, and lateral retreat of the mature salt marsh plateau, resulting in salt marsh rejuvenation, which support these conclusions. However, based on this study no clear relationship could be found between the net expansion or [[erosion]] and the hydrodynamic conditions at the edge of the salt marsh. Hence, additional mechanistic insight is required to determine which and how hydrodynamic and sedimentary conditions are important for the development and erosion of salt marshes.</br> <br />
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===Case study 2: Salt marshes along the Yangtze Esturary, China ===<br />
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The Yangtze Estuary is a typical medium tidal estuary with multi-order [[Bifurcation|bifurcations]], [[Shoal| shoals]] and sand bars. The enormous quantities of sediment produced by the Yangtze River have created extensive areas of shoals and tidal flats in the estuarine region, which have been colonized by various types of salt-marsh vegetation. According to a recent study based on remote sensing mapping (Huang ''et al.'', 2008 <ref>HUANG H.M;, Zhang, L.Q., Guan Y.JK., Wang, D.H., 2008. A cellular automata model for population expansion of ''Spartina alterniflora'' at ''Jiuduansha Shoals'', Shanghai, China. ''Estuarine Coastal And Shelf Science''. '''77''', 47-55.</ref>), the salt marsh vegetation in the Shanghai region amounted to 18314.8 ha (Year 2008) and more than 95% of salt marsh vegetation belonged to the four major plant communities, i.e. the reed (''Phragmites australis'') community, the smooth cord-grass (''Spartina alterniflora'', an exotic species) community, and two types of sedge (''Scirpus mariqueter'' and ''Carex scabriflora'') communities.</br><br />
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The tidal flats closest to the low water mark, elevation less than 2 m, are characterized by mud flats that are devoid of any vascular plants. As sedimentation and succession progressed, the ''Phragmites australis'' community replaced the ''Scirpus mariqueter'' community above the 2.9 m elevation. An additional species in this zone was ''Spartina alterniflora'', which was introduced to the Yangtze Estuary in 1990s. Over the last two decades this species has gradually invaded large areas which were previously covered by ''P. australis'' and has also started to invade the upper parts of the ''S. mariqueter'' zone (Figure 5). This expansion of ''S. alterniflora'', is a prime example of a spatially‐structured invasion in a relatively simple habitat, for which strategic control efforts can be modeled and applied.<br />
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{{THESEUS}}<br />
==See also==<br />
:[[Salt_marshes| Salt marshes]]<br />
:[[Dynamics, threats and management of salt marshes]]<br />
:[[Natural_shore_protecting_barriers#Salt_marshes | Natural barriers, salt marshes]]<br />
:[[Biogeomorphology of coastal systems]]<br />
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==References==<br />
<references/><br />
</br><br />
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[[Category:Salt marshes]]<br />
<br />
{{ 5Authors<br />
|AuthorID1=25081<br />
|AuthorFullName1= van Belzen, Jim<br />
|AuthorID2=8361<br />
|AuthorFullName2= Bouma, Tjeerd<br />
|AuthorID3=20719<br />
|AuthorFullName3= Skov, Martin<br />
|AuthorID4=20751<br />
|AuthorFullName4= Zhang, Liquan<br />
|AuthorID5=?<br />
|AuthorFullName5= Yuan, Lin<br />
}}</div>Dronkers J