The distribution of Magelona johnstoni was in both periods limited to the near-coastal zone, where the species was characterised by a rather uniform distribution and a high relative occurrence. Whereas M. johnstoni was found in maximum densities of about 200 ind./m2 in the 1976-1984 period, higher densities were found in the 1994-2001 period (up to approximately 9,000 ind./m2)
- Degraer S., J. Wittoeck, W. Appeltans, K. Cooreman, T. Deprez, H. Hillewaert, K. Hostens, J. Mees, E. Vanden Berghe & M. Vincx (2006). The macrobenthos atlas of the Belgian part of the North Sea. Belgian Science Policy. D/2005/1191/3. ISBN 90-810081-6-1. 164 pp. http://www.marinespecies.org/aphia.php?p=sourcedetails&id=9234
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