High-resolution Reconstruction of a Holocene Coastal Sequence (NW Germany) Using Inorganic Geochemical Data and Diatom Inventories

Dellwig, Olaf; Watermann, Frank; Brumsack, Hans‐Jürgen; Gerdes, Gisela

doi:10.1006/ecss.1998.0462

Cited by 38 publications

(22 citation statements)

References 35 publications

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“…Fragments representing more than half frustules were counted as a whole (Schrader and Gersonde 1978). Detailed results on stratigraphy and species composition have been published elsewhere (Dellwig et al 1998(Dellwig et al , 1999.…”

Section: Own Datamentioning

confidence: 99%

Differences in species richness patterns between unicellular and multicellular organisms

Hillebrand

Watermann²,

Karez³

et al. 2001

Oecologia

189

124

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For unicellular organisms, a lack of effects of local species richness on ecosystem function has been proposed due to their locally high species richness and their ubiquitous distribution. High dispersal ability and high individual numbers may enable unicellular taxa to occur everywhere. Using our own and published data sets on uni- and multicellular organisms, we conducted thorough statistical analyses to test whether (1) unicellular taxa show higher relative local species richness compared to multicellular taxa, (2) unicellular taxa show lower slopes of the species:area relationships and species:individuals relationships, and (3) the species composition of unicellular taxa is less influenced by geographic distance compared to multicellular taxa. We found higher local species richness compared to the global species pool for unicellular organisms than for metazoan taxa. The difference was significant if global species richness was conservatively estimated but not if extrapolated, and therefore higher richness estimates were used. Both microalgae and protozoans showed lower slopes between species richness and sample size (area or individuals) compared to macrozoobenthos, also indicating higher local species richness for unicellular taxa. The similarity of species composition of both benthic diatoms and ciliates decreased with increasing geographic distance. This indicated restricted dispersal ability of protists and the absence of ubiquity. However, a steeper slope between similarity and distance was found for polychaetes and corals, suggesting a stronger effect of distance on the dispersal of metazoans compared to unicellular taxa. In conclusion, we found partly different species richness patterns among uni- and multicellular eukaryotes, but no strict ubiquity of unicellular taxa. Therefore, the effect of local unicellular species richness on ecosystem function has to be reanalyzed. Macroecological patterns suggested for multicellular organisms may differ in unicellular communities.

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Section: Own Datamentioning

confidence: 99%

Differences in species richness patterns between unicellular and multicellular organisms

Hillebrand

Watermann²,

Karez³

et al. 2001

Oecologia

189

124

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“…Using stable isotopes, (Dellwig et al (1999(Dellwig et al ( , 2001 documented the microbiological reduction of SO 4 2-in a number of sediment cores that were collected in a region a few kilometers west of the CAT-Field. Furthermore, they determined seawater as the main source for SO 4 2-.…”

Section: Sulfate Reductionmentioning

confidence: 99%

Geochemical processes in the saltwater–freshwater transition zone: comparing results of a sand tank experiment with field data

Panteleit¹,

Hamer

Kringel

et al. 2010

Environ Earth Sci

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Geochemical processes, occurring in a stable transition zone between saltwater and freshwater, were simulated in a 2D, multi-layer flow chamber experiment. Mixing, calcite dissolution, and oxidative degradation of organic matter were identified as the main controlling factors. The results of the chamber experiment were compared to field data and verified by thermodynamic modeling. Similarity in most ion distributions suggests the general applicability of the experimental method. Differences in the redox conditions between field and experiment were reflected by the oxidants involved in the mineralization of organic carbon; while field data show evidence of sulfate reduction, the presence of oxygen in the laboratory experiment resulted in the reoxidation of sulfides.

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“…However, from about 7300 bp onwards the continuous transgression was interrupted by several fluctuations and even regressive phases. This approach is reflected clearly by the formation of peat layers found within the marine sediments of the Holocene wedge (Streif, 1990, 2004; Dellwig et al. , 1998, 1999; Freund & Streif, 1999).…”

Section: Introductionmentioning

confidence: 99%

Geochemistry of Holocene salt marsh and tidal flat sediments on a barrier island in the southern North Sea (Langeoog, North‐west Germany)

Kolditz

Dellwig²,

Barkowski

et al. 2011

Sedimentology

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The barrier islands of the southern North Sea were formed during the Holocene sea-level rise. These islands form part of a highly dynamic environment whose evolution continues today. Subjected to sea-level changes, tides and storm events, the sedimentary record reflects processes occurring under varying energy conditions. This article presents geochemical, mineralogical and diatom investigations carried out in the salt marsh of the East Frisian barrier island of Langeoog, which is re-exposed to a rising sea-level due to de-embankment. The major aim of this study is to improve the knowledge of the sedimentological and geochemical development of these deposits under the influence of sea-level rise, with a special focus on the geochemistry and distribution of heavy mineral-associated elements. Correlation diagrams between FeO, TiO 2 and MnO, as well as ternary plots (Al 2 O 3 -SiO 2 -Zr or TiO 2 ), clearly indicate the variable appearance of heavy minerals in different lithological facies, comprising marsh soil, mixed and sand flat, and relocated beach sands. A dominating abundance of ilmenite followed by zircon, garnets and some other heavy minerals is evidenced by Scanning Electron Microscope-Energy Dispersive X-ray measurements. The data presented here suggests that these geochemical proxies are useful tools for characterizing depositional energy conditions. Increasing depositional energy is evident for the lithological units in the following order: marsh soil, mixed flat, sand flat and relocated beach sand. The energetic conditions during sediment deposition, as well as the sedimentary history, are confirmed by diatom analyses as an additional independent indicator. Depending on source rock composition, the geochemical parameters used in this study may also help to investigate depositional energy regimes of other siliciclastic sedimentary systems.

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High-resolution Reconstruction of a Holocene Coastal Sequence (NW Germany) Using Inorganic Geochemical Data and Diatom Inventories

Cited by 38 publications

References 35 publications

Differences in species richness patterns between unicellular and multicellular organisms

Differences in species richness patterns between unicellular and multicellular organisms

Geochemical processes in the saltwater–freshwater transition zone: comparing results of a sand tank experiment with field data

Geochemistry of Holocene salt marsh and tidal flat sediments on a barrier island in the southern North Sea (Langeoog, North‐west Germany)

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