Rolle der Meiofauna und ihre Nahrungsquellen in intertidalen Habitaten der Marennes-Oléron Bucht, Frankreich, und der Sylt-Rømø Bucht, Deutschland.Bedeutung der Mikrophytobenthos-Meiofauna-Nahrungskette, dargestellt am Beispiel der Gemeinschaftsstruktur, der trophischen Marker und linearer inverser Nahrungsnetzmodelle
| Autor: | van der Heijden, Luuk |
|---|---|
| Přispěvatelé: | Dr. Benoit Lebreton, Dr. Harald Asmus, HDR, Prof. Dr. Martin Wahl, Prof. Dr. Jack Middelburg, Prof. Dr. Tom Moens, Lebreton, Benoit, Wahl, Martin, Middelburg, Jack, Moens, Tom, Asmus, Harald |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
compound-specific isotope analyses
ecological food web model benthische Copepoden Abschlussarbeit microphytobenthos Seegraswiesen stable isotopes sandflats Faculty of Mathematics and Natural Sciences fatty acids Frei-lebende marine Nematoden benthische Copepoden Microphytobenthos Gemeinschaftsstruktur Stabile Isotopen Fettsäuren Komponenten-spezifische Isotopenanalyse Ökologisches Nahrungsnetzmodell Seegraswiesen Schlickwatten Sandwatten doctoral thesis Fettsäuren ddc:570 free-living marine nematodes benthic copepods microphytobenthos community structure stable isotopes fatty acids compound-specific isotope analyses ecological food web model seagrass beds mudflats sandflats mudflats Stabile Isotopen free-living marine nematodes Sandwatten Schlickwatten seagrass beds Gemeinschaftsstruktur Frei-lebende marine Nematoden Ökologisches Nahrungsnetzmodell Komponenten-spezifische Isotopenanalyse ddc:5XX community structure Mathematisch-Naturwissenschaftliche Fakultät benthic copepods |
| Popis: | Meiofauna play an important role in ecosystem processes in soft-bottom benthic habitats, e.g. food web dynamics, related to their high production, their intermediate trophic position and the energy they transfer towards higher trophic levels. The trophic linkages and flows of organic matter related to the meiofauna remain poorly known or taken into account. To better assess the role of meiofauna, the community structure and trophic relationships between food sources and meiofauna were determined in five intertidal soft-bottom habitats (i.e., mudflat, seagrass bed, sandflat) of the Marennes-Oléron Bay, France, and the Sylt-Rømø Bight, Germany, taking temporal variations into account. Meiofauna communities were dominated by nematodes and benthic copepods. Biomass of microphytobenthos and of sediment organic matter were two of the major drivers of community structure. The combination of trophic markers (i.e., stable isotopes, fatty acids) demonstrated that microphytobenthos and bacteria were the major food sources of meiofauna in the five habitats. Information from community structure assessments and trophic marker analyses were implemented in food web models. In all habitats, these models demonstrated that the main flow of carbon to meiofauna originated from microphytobenthos, highlighting negligible changes in meiofauna feeding behavior besides the large differences in availability and productivity of food sources between these habitats. All trophic groups of nematodes, except for selective deposit feeding nematodes, were highly selective and mainly fed on microphytobenthos, resulting in a high production and a short turn-over time of meiofauna. In conclusion, this thesis demonstrated the important role of meiofauna in soft-bottom habitats as well as the importance of the trophic pathway from microphytobenthos to meiofauna in the functioning of these food webs. |
| Databáze: | OpenAIRE |
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