Institut für Ostseeforschung Warnemünde
IOW Logo

Arbeitsgruppe Ökologie benthischer Organismen - Aktuelle Projekte

Marine Bivalvia of Germany

Duration: 01.10.2018-31.12.2020

Especially since the beginning of the 1990s, due to the increase of offshore activities associated with wind mill farms, gas pipelines and oil fields and the consequent need for environmental impact assessments, the demand for knowledge of benthic residents, their distribution and ecological needs has increased. There is more than one reason to present a new key book on bivalves for the German parts of the North Sea and Baltic Sea. First, it is an attempt to consider all marine species observed at least once in the whole catchment area. All species are figured and described comprehensively and their distribution is given in a map. Second, due to the rapid increase of non-indigenous species, we included species that seem to be in the process of becoming established as well as those that already are. The reader now has the opportunity to rely on one monograph rather than having to combine several well-known handbooks from neighbouring areas (see above) or to search in several publications dealing with a single species.

The present handbook will be published in the famous series “Die Tierwelt Deutschlands und der angrenzenden Meeresteile”, which did not yet contain the marine bivalves.

Förderung durch: Hausprojekt
Ansprechpartner: Dr. Michael L. Zettler 
Monitoringstationen in der Ostsee
Monitoringstationen in der Ostsee
Monitoring Ostsee
Dauer: fortlaufend
Die Arbeitsgruppe beschäftigt sich seit Jahren mit der Untersuchung, Analyse und Bewertung benthischer Lebensgemeinschaften in der Ostsee. Eine wesentliche Aufgabe ist dabei das biologische Monitoring im Rahmen des Baltic Monitoring Programms der HELCOM (Helsinki-Kommission zum Schutz der Meeresumwelt des Ostseeraums) im Auftrag des Bundesamtes für Seeschifffahrt und Hydrographie (BSH). Einmal pro Jahr werden dabei an 9 Ostseestationen Proben entnommen. Die Ergebnisse werden in die MUDAB-Datenbank des Bund-Länder-Mess-Programmes (BMLP) eingespeist und in Form von Monitoringberichten alljährlich veröffentlicht. Die Qualitätssicherung erfolgt über die Teilnahme an taxonomischen Workshops und den Makrozoobenthos-Ringtests des Umweltbundesamtes.
Das Analytik-Labor der Arbeitsgruppe ist DAkks-akkreditiert.
Förderung durch: Bundaamt für Seeschifffahrt und Hydrographie (BSH)
Ansprechpartner: Dr. Michael L. Zettler 
Benthos data in the German Baltic Sea
Benthos data in the German Baltic Sea
Dauer: 01.06.2019 bis 31.12.2021

Mapping of habitats (biotopes) and their living communities at the sea floor along the coasts of Mecklenburg-Vorpommern

Benthic communities are an important interface between fluxes of the water column and the sea floor and are sensitive to changes in both compartments. Based on this ecological function and the slow mobility of most benthic species, they play a special role in assessing anthropogenic influences on marine ecosystems. Therefore, the state of benthic communities represents a basis for water quality assessments and is considered in Descriptor 1 ‘biodiversity’, Descriptor 2 ‘non-indigenous species’ and in Descriptor 6 ‘sea-floor integrity’ of the European Marine Strategy Framework Directive (MSFD).

The ATLAS project is funded by the „Landesamt für Umwelt, Naturschutz und Geologie Mecklenburg-Vorpommern (LUNG M-V)“ and the European Maritime and Fisheries Fund (EMFF). In the framework of the project habitat mapping in the coastal water of Mecklenburg-Pomerania is conducted to create a basis for assessment. In general, Specially Protected Habitats by law (Section 30 of the Federal Nature Conservation Act) and Broad Habitat Types (BHT) are distinguished. This leads to higher resolution mapping within protected areas and lower resolution mapping in broad habitats. Within the ATLAS project three focus areas were defined in the coastal waters of Mecklenburg-Western Pomerania, being located in the Bay of Wismar, Darss Sill and Plantagenetgrund.

For the mapping of the sea floor, acoustic data has to be collected first by using side scan sonar and multibeam echosounder in yet uncharted areas. Macrobenthic communities are sampled by Van Veen grab in sandy to gravel sediments and scratch samples are taken by divers on hard bottom substrate. Secondly, in large areas dominated by homogeneous soft substrates, the existing database of macrobenthic communities is complemented by additional sampling stations. Low resolution biotope maps will be delineated using predictive modelling. The recorded data will be used to apply and develop state of the art habitat classification models based on acoustic as well as macrobenthic data over a large-scale area in the Baltic Sea.

Förderung durch: Landesamt für Umwelt, Naturschutz und Geologie (LUNG) Mecklenburg-Vorpommern über den Europäischen Fischereifond
Ansprechpartner: Dr. Michael L. Zettler 
Lembulus bicuspidatus from Namibia
Lembulus bicuspidatus from Namibia

EVAR-WP7 (Adaptation of macrozoobenthic species to fluctuating oxygen concentrations and their effect on benthic fluxe)

Duration: 01.01.2019 - 31.12.2021
Workpackage-PI: Dr. Michael L. Zettler
Funded by: Bundesministerium für Bildung und Forschung (BMBF)

The coe areas of oxygen minimum zones (OMZs) have been subject to studies concerning ecological consequences of permanent low oxygen. The boundaries of OMZs, however, have not been considered as intensely despite their importance with regard to climate change and expansion of OMZs. Several studies concluded that organisms that are able to simultaneously cope with potentially long-lasting hypoxic periods and intense oxygen input e.g. by upwelling events, can build up high densities and biomass if food supply is abundant. Given the high variety of adaption mechanisms to these conditions, successful organisms in and along OMZs likely rely not only on one mechanism, but rather combine several strategies such as, for example, morphological and behavioural traits. In general, the boundaries of the Benguela Upwelling System have been poorly investigated in terms of species inventory, but during preliminary investigations we have observed that certain species occur with highest biomass directly at the edges of the OMZ. Therefore, we now aim to address the question:

By which mechanisms and up to which extent can abundant macrobenthic species survive fluctuations in oxygen availability and how does their activity affect benthic fluxes?

To clarify this, we will initially investigate the distribution of macrobenthic organisms along the transect with changing availability of oxygen in the bottom water. In addition, we will assess the abundance of macrobenthic species in the in situ and ex situ experiments planned to quantify benthic fluxes. This will reveal how the composition and activity of benthic macro organisms affect the fluxes between the sediment and water column. Furthermore, we will conduct targeted incubation experiments with selected, highly abundant species to determine how long they can survive without oxygen and their activity under fluctuations of oxygen availability on different time and concentration scales. This will contribute important boundary conditions for implementation of bioturbation in the benthic modelling work.


Sampling at stony reefs in the Baltic
Sampling at stony reefs in the Baltic
LEGRA (Living along gradients - Analysing the effect of natural and anthropogenic induced parameters on the distribution, diversity and function of benthic communities and their habitats in the southern Baltic Sea)
Duration: 01.01.2019 to 30.06.2022

It is part of a successive series of projects funded by the German Federal Agency for Nature Conservation (BfN) with the goal to establish a sound scientific basis for the implication of relevant European Marine Directives with regard to benthic habitats. Within the project, we will continue our investigations on the spatial-temporal variability of the benthic communities in offhsore areas with a focus on special habitats such as boulder fields and exposed coarse substrates. Our work includes the mapping of benthic habitats on different spatial scales as well as the establishment of new monitoring programmes. We also will apply our findings on common assessment indicators and suggest alternative indicators if required. The analysis will be done in close cooperation with national and regional expert groups and consequently will be integrated into the national and regional discussion on the implementation of European Marine Strategy Framework Directive and the Habitats Directive.

Funded by: Bundesamt für Naturschutz (BfN)
Project Leader: Dr. Michael L. Zettler 
Project Coordinator: Dr. Alexander Darr