References is a Moving Target in Sea-Level Controlled Wetlands

Christian, Robert R.; Stasavich, Laura E.; Thomas, Cassondra R.; Brinson, Mark M.

doi:10.1007/0-306-47534-0_35

Cited by 8 publications

(11 citation statements)

References 24 publications

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“…Contributions relative to compartment throughput from almost all import sources were highest in the high marshes (Table 4). This is consistent with the recognition that the hydrodynamics of high marshes may be more bog-like than intertidal (Stasavich 1998, Christian et al 2000. Contributions to production from precipitation not only were highest in all high marshes but also lowest in all creekbanks.…”

Section: Marsh Zone Trendssupporting

confidence: 86%

“…If the marsh is prograding at the seaward edge, mudflat can become creekbank and then low marsh. It is unlikely, however, that low marsh will become infrequently flooded high marsh in the context of rising sea level (Christian et al 2000). As these landscape changes take place, there are changes in ecosystem characteristics.…”

Section: Relation To Sea-level Risementioning

confidence: 99%

“…We make predictions in the context of 4 scenarios for whole marshes similar to those used by Brinson et al (1995) and Christian et al (2000). They focused on the sustainability of coastal marshes with respect to the slope at their upland edge and availability of sediments.…”

Section: Relation To Sea-level Risementioning

confidence: 99%

“…These zones may experience increased inundation and move horizontally in the landscape as relative sea-level rises. The way these zones respond to increased inundation depends on their position in the landscape, slope, and sedimentary regime (Redfield 1972, Stevenson et al 1985, Bertness 1992, Brinson et al 1995, Christian et al 2000. The creekbank either may prograde seaward or erode depending on sediment supply.…”

Section: Introductionmentioning

confidence: 99%

“…Although these zones are recognized by their plant communities, they also have different ecosystem functions (Christian et al 2000). Some of these functions include primary production (Kruczynski et al 1978, Gallagher et al 1980, sedimentation and peat accu-mulation (Bricker-Urso et al 1989, Kastler & Wiberg 1996, and biogeochemical cycling (Howarth & Hobbie 1982, Osgood et al 1995.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of nitrogen cycling in salt marsh zones related to sea-level rise

Thomas¹,

Christian²

2001

Mar. Ecol. Prog. Ser.

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Zones in salt marshes can be distinguished by different community and ecosystem properties. As marshes respond to changes in sea level, one might expect alterations in the relative proportions of these zones and, hence, alterations in overall functioning. We used ecological network analysis to assess potential changes in 1 ecosystem function, nitrogen cycling. We constructed nitrogen cycle networks of zones (creekbank, low marsh, and high marsh) for 3 salt marshes on the East Coast of the USA; Great Sippewissett in Massachusetts, Upper Phillips Creek in Virginia, and Sapelo Island in Georgia. The same network structure was applied to all zones, largely using data derived from the literature on the 3 marshes. The factors used to analyze how nitrogen flowed through each zone included how nitrogen imported into the marsh was exported, how imports were related to primary productivity, and how much nitrogen was cycled within the system. Emphasis was placed on identifying patterns across zones that were consistent for all 3 marshes. When precipitation and tidal particulate nitrogen (PN) were the imports, export from active cycling via burial and denitrification significantly increased in importance moving across the marsh from the creekbank to the high marsh. Relative nitrogen cycling also significantly increased from creekbank to high marsh. As the area of the marsh zones decrease or increase in response to sea-level rise, nitrogen dynamics will change as a consequence. If the landscape slope is low allowing the marsh to migrate overland, the high marsh zone will increase in area. Nitrogen cycling as a percentage of total system throughput will increase per unit area averaged over the total marsh. If, however, the marsh stalls because of a steep slope at the upland margin, cycling will decrease on a per unit area basis. If the supply of sediment is great and the marsh progrades toward the sea, nitrogen cycling within the marsh may decrease. Therefore, as relative sea-level rises, the response of a salt marsh's nitrogen cycle will depend on the slope and sediment supply available to the marsh. KEY WORDS: Salt marsh · Nitrogen cycle · Network analysis · Sea-level riseResale or republication not permitted without written consent of the publisher

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Section: Marsh Zone Trendssupporting

confidence: 86%

Section: Relation To Sea-level Risementioning

confidence: 99%