Taxonomic und ecologic investigations on distinct polychaetes and meiofauna-species of svalbard

Updated 2003-03-04

In the late seventies, ELLIOTT and KINGSTON (1987) discovered a polychaetous annelid in various North Sea estuaries that had previously been found only in North American estuaries. Further specimens of what appeared to be the same species were found in the mid-eighties in the coastal waters of the Baltic Sea (BICK and BURCKHARDT, 1989). The distribution of these events in time and space led to the assumption that a North American species had immigrated to the North Sea and then extended its range of distribution to the Baltic. Within several years this species became one of the most dominant species in these estuaries. Identification of the immigrant was beset with problems from the start. It was identified as M. wireni AUGENER, 1913 or as M. viridis (VERRILL, 1873). It was the population genetic studies by BASTROP et al. (1995) and ROEHNER et al. (1996a, b) that showed the presence of genetically distinct forms in the North and Baltic Sea as well as in different regions of the north eastern coast of America. The morphological studies undertaken against this background allowed a good discrimination between these species (BICK & ZETTLER, 1997). Though, all authors dealing with the two species immigrated into the European estuaries were unable to name these species. The main reasons for this uncertainty are: - species identification is difficult, because diagnostic characters vary with growth (BICK, 1995), - the geographical distribution of Marenzelleria species is far from clear, - type material no longer exists or it is in poor condition (BICK & ZETTLER, 1997). Specimens of the type species of the genus, Marenzelleria wireni, were recorded from the Arctic region, Franz-Joseph Land and Spitzbergen (WIREN, 1883 and von MARENZELLER, 1892). As mentioned above, these specimens deposited in the Zoologisches Museum Hamburg and the Swedish Museum of Natural History, Stockholm are in poor condition. As far as we know further material from these regions does not exist. In order to eliminate the taxonomic uncertainty it is necessary to investigate morphologically and genetically specimens from the type locality.

Comments and additional information:

The stay at the Koldewey Station will also be used for a faunistic analysis of the littoral meiofauna. The investigation will especially focus on the harpacticoid copepods. The results obtained are intended to be a basis for further studies dealing with the problem of recolonization of areas which were covered by ice over a long period of time. This is insofar of interest since many of the benthic meiofauna members are no swimmers and don't have any pelagic larvae. If species are found that also occur in the Baltic or North Sea, their different functional position in the environments concerned will be studied.

Time frame

Status
Planned
Project time span
2003 - 2003
Data collection
2003 - 2003
Data processing
not specified
Data reporting
not specified

Contact information

Contact person
Prof. Günter Arlt
Address
Universität Rostock, FB Biowissenschaften, Institut für aquatische Ökologie, Abt. Meeresbiologie, Einsteinstr. 3 D-18059 Rostock
Phone
+49-381 498 6053
Fax
+49-381 498 6052
Email
ed.kcotsor-inu.eigoloib@tlra.retneug

Parameters and Media

Parameter groups measured/observed/modelled
Media sampled/studied/modelled
Marine sediments
Additional information or further specification of types of data / information collected, species / tissues / organs sampled, etc.

polychaetae

Geography

Regions studied
Koldewey Station, Ny-Ålesund/Spitsbergen
Svalbard
Other areas
Kongsfjord, West Spitsbergen

Data availability

Samples/specimens archived in specimen banks?
No

Methods & Procedures

Procedures and methodology used for, e.g., sampling and sample storage, sample pretreatment, extraction and analysis, including which laboratories are involved, references to methods employed, etc.

We intend to collect Marenzelleria specimens from Spitzbergen by means of corer, grab, dredge, plankton net or by digging. After sieving, specimens will be fixed in ethanol (for genetic studies), formalin (morphological studies) or glutaraldehyde (SEM studies). Further polychaetes, e.g. specimens of the genus Spio, will be collected, to start taxonomic investigations on some other problematical polychaetous groups.

Additional Information

Is this a bi- AND multi-lateral project (i.e. a project involving cooperation between different countries)?
No
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