Directional and non‐directional vegetation changes in a temperate salt marsh in relation to biotic and abiotic factors

Schröder, Henning K.; Kiehl, Kathrin; Stöck, Martin

doi:10.1658/1402-2001(2002)005[0033:dandvc]2.0.co;2

Cited by 21 publications

(23 citation statements)

References 38 publications

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“…The elongated response curves of 'low marsh' species probably reflect the impact of disturbance on these competitive processes. For example, P. maritima was frequent high up along the elevational gradient possibly due to the widespread grazing regime in salt marshes prior to and during our study (Olff et al 1997;Schröder et al 2002). Accordingly, this species is the most abundant and widespread grass in temperate European salt marshes, especially if grazed (Gray and Mogg 2001).…”

Section: Discussionmentioning

confidence: 78%

“…This indicates, that our results reflect the species' entire elevational range in the study area. Effects of slope, expansion, age, or management of salt marshes (Olff et al 1997;Esselink et al 2000;Schröder et al 2002;Silvestri et al 2005) on the distribution pattern of species were probably subsumed in our data-set. Comparisons of species' responses among studies are rarely possible (Huisman et al 1993;Olff et al 1997;Esselink et al 2000) because species' frequency is often too low to create acceptable SRCs (Coudun and Gégout 2006) and the specific species present vary.…”

Section: Discussionmentioning

confidence: 92%

“…Thus far, studies of species' responses to gradients in North Sea salt marshes have been restricted to small areas (Olff et al 1997;Esselink et al 2000;Schröder et al 2002) or a few species (Huisman et al 1993;Gray and Mogg 2001). In this study, we analyze for the first time species responses in a large and consistent data set of 2,691 plots from salt marshes of the German North Sea coast.…”

Section: Introductionmentioning

confidence: 99%

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Plant Species Responses to an Elevational Gradient in German North Sea Salt Marshes

Suchrow¹,

Jensen²

2010

Wetlands

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Salt marsh vegetation often occurs in zones along an elevational gradient. We present a detailed analysis of the distribution of species in a data set of 2,691 plots from salt marshes along the German North Sea coast. For each 1 m 2 plot, we estimated species' percent cover and calculated elevation in relation to mean high tide. For the 19 most frequent species, distribution and dominance pattern along the elevational gradient (correlated with moisture and salinity) were quantified and species' responses to this gradient analyzed by Huisman-Olff-Fresco (HOF) modelling. Elevational ranges, distribution pattern, and response curves varied widely among the species, with most species' niches positioned in the middle part of the gradient. Nonparametric multiple comparisons (in total 171) did not reveal significant differences in species' ranges for 40 species pairings. Most HOF models resulted in unimodal skewed response curves, with the probability of occurrence decreasing towards the lower and more extreme end of the gradient. We conclude that elevation largely explains species distribution within the studied salt marshes and that species ranges follow a continuum along the gradient. Our data provide a baseline for future studies of possible changes in distribution pattern caused by conservation management or sea level rise.

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Section: Discussionmentioning

confidence: 78%

Section: Discussionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

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Plant Species Responses to an Elevational Gradient in German North Sea Salt Marshes

Suchrow¹,

Jensen²

2010

Wetlands

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“…Currently, with a few exceptions, salt marshes form only a narrow fringe in front of the sea wall as a result of historic land claims. Wide coastal salt marshes also feature a more diverse accretion gradient in comparison with narrow marshes, thus affecting vegetation diversity (Schröder et al 2002). The more gradient-rich characteristics of wide salt marshes prompted Esselink et al (2009) to advise for prioritizing the restoration of wide sites in salt-marsh restoration.…”

Section: Salinization and Elevationmentioning

confidence: 99%

Salinization during salt-marsh restoration after managed realignment

et al. 2015

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Salt marshes provide an important and unique habitat for plants and animals. To restore salt marshes, numerous coastal realignment projects have been carried out, but restored marshes often show persistent ecological differences from natural marshes. We evaluate the effects of elevation and marsh topography, which are in turn affected by drainage and livestock grazing, on soil salinity after de-embankment. Salinity in the topsoil was monitored during the first 10 years after de-embankment and compared with salinity in an adjacent reference marsh. Additionally, salinity at greater depths (down to 1.2 m below the marsh surface) was monitored during the first 4 years by measuring the electrical conductivity of the groundwater. Chloride concentration in the top soil strongly decreased with increasing elevation; however, it was not affected by marsh topography, i.e. distance to creek or breach. Chloride concentrations higher than 2 g Cl − /litre were found at elevations below 0.6 m + MHT. Salinization of the groundwater, however, took several years. At low marsh elevations, the salinity of the deep groundwater (at 1.2 m depth) increased slowly throughout the full 4-year period of monitoring but did not reach the level of seawater. Compared to the ungrazed treatment, the grazed treatment led to lower accretion rates, lower soil-moisture content and higher chloride content of soil moisture. The de-embankment of the agricultural grasslands resulted in a rapid increase of soil salinity, although deeper ground-water levels showed a much slower response. Elevation accounted for most of the variation in the salinization of the soil. Grazing may enhance salinity of the top soil.

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“…The use of salt marsh soils as livestock grazing is once a widespread practice in North America (Hatvany, 2003) and in Europe (Jensen, 1985;Kiehl et al, 1996;Bos et al, 2002;Schroder et al, 2002;Tessier, 2003) or in Africa (Ouattara & Louppe, 1998 (Bakker et al, 1985;Malo & Suazer, 1995). …”

Section: Pollen's Analysis Of Surface Sediments In Lagoamentioning

confidence: 99%

Pollen approach and evolution of the floristic biodiversity of the humid and salty zone of the Fetzara lake (Northeast of Algeria)

2017

Int. J. Biosci.

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The study of pollen grain deposits in two transects of Fetzara lake (North/East of Algeria) was confronted with the floristic environment cover. This study required an inventory of vegetation (264 species) supported by archival documents (ancient botanical studies) and pollen analyzes (86 taxa). A total of 12 surface pollen samples was collected, then, chemically treated according to the standard method. Percentages of pollen were calculated in all samples. The results have showed that the current deposits palynomorphes in lake surface sediments reflect the regional vegetation of the watershed. The differential distribution indicates a dominance of nonarboreal pollen (52%) represented by the Asteraceae, Poaceae and Asphodelaceae on two transects. This reflects the current state of the vegetation cover, further, the presence of Alnus probably comes from the wet complex Guerbès Sanhadja, while that of Pinus, Quercus and Pistacia come from the bushes and the degraded subery of the Edough. The dominance of halophyte species such as Suaeda maritima L. and Salsola soda, as well as pollen from Chenopodiaceae, confirms the salinity of the environment. The richness of the site of aquatic and semiaquatic vegetation such as Typha domingensis (Pers.) Steudel, Juncus acutus L. and Myriophyllum verticillatum L. indicates the existence of water less than a wet period in the site. The study also showed the presence of a large amount of damaged pollen, probably related to poor conservation conditions and especially the moisture and desiccation phenomena that prevail on the surface of the soil.

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Directional and non‐directional vegetation changes in a temperate salt marsh in relation to biotic and abiotic factors

Cited by 21 publications

References 38 publications

Plant Species Responses to an Elevational Gradient in German North Sea Salt Marshes

Plant Species Responses to an Elevational Gradient in German North Sea Salt Marshes

Salinization during salt-marsh restoration after managed realignment

Pollen approach and evolution of the floristic biodiversity of the humid and salty zone of the Fetzara lake (Northeast of Algeria)

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