Marine Invertebrates II
The section Marine Invertebrates II is responsible for the curation of a large part of Senckenberg’s collections of recent, mainly marine invertebrates: Plathyhelminthes, Nemertea, Aschelminthes, Sipuncula, Echiura, Annelida, Onychophora, Chaetognatha , Echinodermata and Hemichordata.
Especially the plathyhelminths, annelids, onychophorans and echinoderms represent valuable collections including numerous type specimens. The collections have been transferred to SeSam/Aquila with financial support by the Walter & Erika Datz-Foundation and the German Research Foundation (DFG; FI 433/12-1) and are available for online research. Research of the section is focused on the taxonomy, systematics, morphology and biogeography of Polychaeta.
The Polychaeta form a group of the phylum Annelida and comprise with its approximately 10000 currently known species one of the most diverse marine animal taxa besides Crustacea and Mollusca. They occurr in great diversity in all marine habitats from the intertidal down to the deep-sea, from seagrass meadows to hot vents. Polychaetes do not only show a wide variety of morphological adaptations to their habitat and mode of life, they are also able to cope with advertent living conditions in such extreme habitats as hot vents and cold seeps. These habitats are charaterized by high temperature and dissolved toxic substances like sulfur and heavy metals. In suitable habitats polychaetes often occurr in large densities producing important biomass, especially in soft sediments, e.g. Arenicola marina at our North Sea coast.
They are among the most common marine animals and therefore an important element of the marine foodweb. Many polychaetes live on detritus, thus recycling nutrients, while they themselves are preyed upon by fish, other invertebrates and even birds – on tidal flats. They also play an important role in bioturbation of the sediment, as bioindicators, fouling species on ships and harbor facilities, as species distributed by man (neozoa) and as pests in oyster farms. They are the subject of physiological and developmental research. And last but not least polychaetes grown in aquacultures are of economic importance as fishing bait. In the beginning of the 90s aquaculture of polychaetes in Maine (USA) produced an annual value of ca. 3,5 Mio US $ and thus represented an important income for fisheries in this region next to lobster, clams and fish.
Research on systematics and diversity of polychaetes is of basic importance not only for systematics itself, but also for other fields of research such as ecology and conservation. Moreover, polychaetes play an important role in the deep-sea, a global habitat that has received much attention during the last years.
Besides the curation of the above mentioned collections, the section has taken over a number of other institutional obligations, like running the scanning electron microscope and the organization of the institutional seminar.