Abstract
The metabolic responses ofMarenzelleria cf.wireni, a newly established polychaete worm within North Sea estuaries, to various kinds of environmental stress are summarised. With respect to salinity,M. cf.wireni is able to deal with variations within a wide range. In the process of osmotic acclimation, free amino acids are involved. The major amino acid in terms of osmotic effector is glycine, followed by alanine. Under severe hypoxia,M. cf.wireni switches to an anaerobic metabolism, but at a very low oxygen partial pressure ( 1 mmol l−1). This might have an influence on the distribution pattern of the two sibling species.
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