The microphytobenthos of Königshafen—spatial and seasonal distribution on a sandy tidal flat

Asmus, Ragnhild; Bauerfeind, Ernst

doi:10.1007/bf02367040

Cited by 36 publications

(22 citation statements)

References 33 publications

(29 reference statements)

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“…The diatom associations at site D conform to the descriptions of those on the sandflats at Königshafen provided by Asmus and Bauerfeind (1994), where the main genera were Achnanthes, Amphora, Navicula, and Pleurosigma, while Cylindrotheca gracilis, Diploneis, Gyrosigma fasciola, and Nitzschia are largely lacking during the summer. The development of Merismopedia glauca completes the comparison.…”

Section: Discussionsupporting

confidence: 75%

“…Biomass is represented by corresponding surface areas. Exotic species mean in this context species that are normally not occurring at the site acteristic diatom associations have been described for the different kinds of sediments and the various mudand sandflat areas (Brockmann 1950;Sundbäck 1983;Asmus and Bauerfeind 1994). According to the results reported here, the influence of the nutrient supplies is so strong, however, that the typical associations can be completely replaced.…”

Section: Factors With Influencesupporting

confidence: 50%

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Structural changes in the benthic diatom community along a eutrophication gradient on a tidal flat

Agatz¹,

Asmus²,

Deventer

1999

Helgol Mar Res

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In the mud-and sandflat region of the outer Königshafen off List on Sylt, the effects of the outflow from a sewage treatment plant on the benthic diatom flora were investigated. The spectrum of shapes, biomass, and diversity was determined in relation to the concentrations of phosphate, silicate, and nitrogen compounds in the overlying and pore water. The biomass increased with the available quantities of nutrients, while the diversity reached a maximum at the intermediate concentrations.Every different set of nutrient concentrations is characterized by a different diatom community. Slight inputs of nutrients led to changes in the relative abundances of forms typical of the habitat. Moderate concentrations permitted the species that are normally present in winter to occur in summer as well. In the strongly eutrophic region, nutrientloving species that are not locally present under normal conditions formed nearly monospecific populations. A relatively constant input of nutrients almost eliminated the seasonal variations. Navicula gregaria, Nitzschia sigma, and Nitzschia tryblionella proved to be tolerant of pollution, while the genera Achnanthes and Amphora were typical in the nutrient-poor regions. The nutrient budget, particularly that of the nitrogen compounds, was found to be predominant among the physical and chemical factors.

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Section: Discussionsupporting

confidence: 75%

Section: Factors With Influencesupporting

confidence: 50%

Structural changes in the benthic diatom community along a eutrophication gradient on a tidal flat

Agatz¹,

Asmus²,

Deventer

1999

Helgol Mar Res

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“…Data on the biomass of sediment and pelagic bacteria were obtained from Kirchman et al (1986), Schulz (1990) and Rusch et al (2001). The biomass, rates of gross primary (GPP) and net primary (NPP) production of the 3 primary producer communities, namely phytoplankton, microphytobenthos and macrophytes were given by Asmus & Bauerfeind (1994) and R. . Average annual biomass estimates for the various macrofaunal and fish species and communities were extracted from the published literature (cf.…”

Section: Methodsmentioning

confidence: 99%

Energy flow of a boreal intertidal ecosystem, the Sylt-Rømø Bight

Baird¹,

Asmus

Asmus³

2004

Mar. Ecol. Prog. Ser.

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A detailed energy flow model consisting of 56 living and 3 non-living compartments was assembled for the intertidal area of the Sylt-Rømø Bight. The model depicts the biomass of each compartment, carbon flow between the components, imports and exports, as well as an energy budget for each. The food web was analysed by means of network analysis which showed that about 17% of the total daily flow through the system is recycled through a complex cycling structure consisting of 1197 cycles. The cycling network indicated that about 99% of the recycling involves 2 to 3 compartments, with sediment bacteria and particulate organic carbon (POC) participating in most instances. Input/output analyses indicated that phytoplankton production in the Bight does not satisfy the demands of filter-feeders on an annual average basis so that about 160 mg C m -2 d -1 of phytoplankton have to be imported. We compared several dimensionless system level indices, such as internalised and normalised A/DC (ascendancy/development capacity) ratios, calculated for the Bight with those of other marine and estuarine ecosystems on a global basis. These comparisons showed that energy is rather inefficiently transferred within the Bight at a mean trophic efficiency index of 2.61%, and that most of the system level indices are lower than those of other coastal ecosystems. However, higher values were obtained for flow diversity and food web connectance compared to other systems. This study has revealed the Bight to be a highly complex system whose energy pathways appear to be sensitive to external perturbations.

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“…Major data sources: Drebes [16], Asmus [17], Asmus and Bauernfeind [18] and Hoppenrath [19][20][21] (5) Benthic macroflora-Additional file 1: Table S5 A high number of macroalgal species occurring around the island of Sylt have already been described in Kornmann and Sahling [22]. Twenty years later, Schories et al [23] gave a first comprehensive overview on macroalgae species in the area.…”

Section: Resultsmentioning

confidence: 99%

Microscopic species make the diversity: a checklist of marine flora and fauna around the Island of Sylt in the North Sea

et al. 2018

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Based on the past 150 years of research and ongoing time-series observations we give a comprehensive overview of marine species composition around the island of Sylt in the eastern North Sea. A total of 2758 species is listed according to the categories microplankton (591 species), zooplankton (137), nekton (118), benthic microflora (158), benthic macroflora (125), benthic micro-and meiofauna (1204), benthic macrofauna (509), birds and mammals (91), and neobiota (39). Plants account for a third of the species, most (85%) of them are microscopic Chromista. Among animals, 60% of the species are micro-and meiofauna though this faunal component is still insufficiently known. These figures are similar to records from the southern North Sea and therefore may by typical for temperate climate sedimentary coastal areas. A comparison with the total of marine species suggests that the small benthic fauna may be severely understudied over most of the world. Analysis of global change depends on sound baseline data and species inventories like this can assist in the detection of biodiversity changes. They emphasise rare species and the full range of local habitats while time-series measurements usually rely on a few selected habitats and biotic components to generate a very general picture of the state of an ecosystem.

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The microphytobenthos of Königshafen—spatial and seasonal distribution on a sandy tidal flat

Cited by 36 publications

References 33 publications

Structural changes in the benthic diatom community along a eutrophication gradient on a tidal flat

Structural changes in the benthic diatom community along a eutrophication gradient on a tidal flat

Energy flow of a boreal intertidal ecosystem, the Sylt-Rømø Bight

Microscopic species make the diversity: a checklist of marine flora and fauna around the Island of Sylt in the North Sea

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