The Freshwater Animal Diversity Assessment (FADA) database contains authoritative species lists for several taxonomic groups and distribution data at the level of faunistic regions. This dataset contains the Glasby, C. " Timm, T., 2016 December 15, World checklist of freshwater Polychaeta species. World Wide Web electronic publication. Available online at http://fada.biodiversity.be/group/show/11. It has been updated based on Glasby, Christopher J., Timm, Tarmo, Muir, Alexander I., Gil, João (2009): Catalogue of non-marine Polychaeta (Annelida) of the World. Zootaxa 2070: 1-52, DOI: 10.5281/zenodo.187085.
The larvae of the reef-building polychaete Lanice conchilega can make up to 15% of the summer zooplankton biomass in the North Sea. Despite their importance for reef maintenance (which positively affects the benthic community), little is known about the trophic ecology of this meroplanktonic larva. Qualitative and quantitative estimates of carbon (C) transfer between trophic levels and of fatty acid (FA)-specific assimilation, biosynthesis, and bioconversion can be obtained by compound-specific stable isotope analysis of FA. The present work tested the hypothesis that the concept of fatty acid trophic markers (FATM), widely used for studies on holoplankton with intermediate to high lipid contents, is also applicable to lipid-poor organisms such as meroplanktonic larvae. The incorporation of isotopically-enriched dietary C by L. conchilega larvae was traced, and lipid assimilation did not follow FA-specific relative availabilities in the diet. Furthermore, FAs that were unavailable in the diet, such as 22:5(n-3), were recorded in L. conchilega, suggesting their bioconversion by the larvae. The results indicate that L. conchilega larvae preferentially assimilate certain FAs and regulate their FA composition (lipid homeostasis) independently of that of their diet. Their quasi-homeostatic response to dietary FA availability could imply that the concept of FATM has limited application in lipid-poor organisms such as L. conchilega larvae.
The larvae of the reef-building polychaete Lanice conchilega can make up to 15% of the summer zooplankton biomass in the North Sea. Despite their importance for reef maintenance (which positively affects the benthic community), little is known about the trophic ecology of this meroplanktonic larva. Qualitative and quantitative estimates of carbon (C) transfer between trophic levels and of fatty acid (FA)-specific assimilation, biosynthesis, and bioconversion can be obtained by compound-specific stable isotope analysis of FA. The present work tested the hypothesis that the concept of fatty acid trophic markers (FATM), widely used for studies on holoplankton with intermediate to high lipid contents, is also applicable to lipid-poor organisms such as meroplanktonic larvae. The incorporation of isotopically-enriched dietary C by L. conchilega larvae was traced, and lipid assimilation did not follow FA-specific relative availabilities in the diet. Furthermore, FAs that were unavailable in the diet, such as 22:5(n-3), were recorded in L. conchilega, suggesting their bioconversion by the larvae. The results indicate that L. conchilega larvae preferentially assimilate certain FAs and regulate their FA composition (lipid homeostasis) independently of that of their diet. Their quasi-homeostatic response to dietary FA availability could imply that the concept of FATM has limited application in lipid-poor organisms such as L. conchilega larvae.
The larvae of the reef-building polychaete Lanice conchilega can make up to 15% of the summer zooplankton biomass in the North Sea. Despite their importance for reef maintenance (which positively affects the benthic community), little is known about the trophic ecology of this meroplanktonic larva. Qualitative and quantitative estimates of carbon (C) transfer between trophic levels and of fatty acid (FA)-specific assimilation, biosynthesis, and bioconversion can be obtained by compound-specific stable isotope analysis of FA. The present work tested the hypothesis that the concept of fatty acid trophic markers (FATM), widely used for studies on holoplankton with intermediate to high lipid contents, is also applicable to lipid-poor organisms such as meroplanktonic larvae. The incorporation of isotopically-enriched dietary C by L. conchilega larvae was traced, and lipid assimilation did not follow FA-specific relative availabilities in the diet. Furthermore, FAs that were unavailable in the diet, such as 22:5(n-3), were recorded in L. conchilega, suggesting their bioconversion by the larvae. The results indicate that L. conchilega larvae preferentially assimilate certain FAs and regulate their FA composition (lipid homeostasis) independently of that of their diet. Their quasi-homeostatic response to dietary FA availability could imply that the concept of FATM has limited application in lipid-poor organisms such as L. conchilega larvae.
Gegenstand des Projektes ist die Untersuchung der Biodiversitaet der Polychaeten im Suedpolarmeer. Die existierenden faunistischen und zoogeographischen Daten sowie die taxonomische Literatur soll zu weiterfuehrenden Studien ueber die Zusammensetzung der Polychaetenfauna in hoch- und subantarktischen Lebensgemeinschaften genutzt werden, um die Abhaengigkeit der Diversitaet und Dominanz von biotischen und abiotischen Umweltfaktoren wie Substrat, Wassertiefe, Wasserstroemung und Sedimenttransport, Nahrungszufuhr u.a. zu ermitteln. Neben der Artenzusammensetzung sollen, soweit moeglich, auch Lebensformtypen charakterisiert werden, wie Ernaehrungstypen (z.B. Filtrierer, Raeuber), vagile bzw. sessile Lebensweise und Tiefe der Roehren und Gaenge von sessilen Arten im Sediment. Diese Fragestellungen zielen auf eine Dokumentation der Nutzung oekologischer Nischen, besonders in groesseren Tiefen des Suedpolarmeeres. Schliesslich soll geklaert werden, ob sich die antarktische und subantarktische Polychaetenfauna hinsichtlich der numerisch dominanten Familien von anderen Tiefseegemeinschaften unterscheidet.