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Dumping effects

Fauna species

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Typical fauna species

 

Links in the text refer to short video clips

Asterias rubens

The common starfish occurs in large numbers in the western Baltic. Asterias rubens is a typical predator, predominantly feeding on blue mussels. Here are short clips showing the escape reaction of a starfish during daytime and at night.

 

Arenicola marina

Arenicola marina is a polychaete worm, which lives in tube-shaped burrows inside the sediment. Its common name is either "lugworm" or "pierworm". Arenicola marina feeds on the substratum. The most remarkable attribute are twelve branched gills on its central part. Here is are two short clips of the faecal mound of a lugworm, one from the dumping site and one recorded in a laboratory aquarium.

 

Barnea candida

The white piddock Barnea candida lives in sublitoral and shallow coastal waters. It drills galleries in wood, peat and soft rocks (e.g. marl). See a short clip of holes drilled in marl (= glacial boulder clay).

 

Carcinus maenas

The crab is quite an active predator, living on soft bottom, sandy sediments or rocks alike. It also has a high osmoregulation capacity, i.e. a high tolerance for low salinity levels. This is a short clip showing a crab on sandy ripples in the dumping site area.

 

Macoma balthica

The baltic tellin is widespread in the Baltic, including the brackish northern parts. At the sediment surface, only a small sipho reveals the presence of Macoma balthica, which is used to filter and pipette food particles. The short clip shows this feeding behavior.

 

Mya arenaria

The sand gaper prefers sandy or silty sand sediments. It is found even in northern parts of the Baltic. Mya arenaria lives as a suspension feeder and burrows deep into the sediment. See a clip showing the filter feeding of a burrowed sand gaper. Some particles demonstrate the in- and exhalant currents. The clip was recorded under laboratory conditions.

 

Mytilus edulis

The body size of the blue mussel (Mytilus edulis) correlates with decreasing salinty levels in the Baltic. The mussel is a suspension feeder with high filtration rates. It needs hard substrates to attach its byssus threads. In the absence of suitable surfaces, mussels tend to form clumps or dense beds, firmly attached to each other. These conglomerates of blue mussels are shown in this clip from the dumping site 552a.

 

Pectinaria koreni

The trumpet worm usually feeds head-down on organic matter in the sediment. The short clip shows the tube aperture of a worm on the sediment surface, trying to dig back into the sediment of an aquarium.

 

Pygospio elegans

The bristleworm lives in sandy sediments and facultatively feeds on deposits or suspended matter. Dense populations are often called "tube lawns". The clip shows such a dense community of Pygospio elegans and the two tentacles can be seen flickering around in search for food particles.