Overview

Distribution

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.
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© WoRMS for SMEBD

Source: World Register of Marine Species

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Physical Description

Diagnostic Description

Description

A digging bristle worm with an oval, flattened head bearing two long palps covered with numerous papillae. The long filiform body (up to 170 mm) can be separated into two different regions, each characterised by short parapodia. The anterior region is coloured pale pink, the posterior region greenish grey with white patches.
  • 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.
Creative Commons Attribution 3.0 (CC BY 3.0)

© WoRMS for SMEBD

Source: World Register of Marine Species

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Type Information

Paratype for Magelona johnstoni Fiege et al., 2000
Catalog Number: USNM 186519
Collection: Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology
Preparation: Alcohol (Ethanol)
Locality: Scotland, Fife, St. Andrews, Fife, Scotland, United Kingdom, North Sea, North Atlantic Ocean
  • Paratype: Fiege, D., et al. 2000. A partial review of the European Magelonidae (Annelida: Polychaeta): Magelona mirabilis redefined and M. johnstoni sp. nov. distinguished. Jour. Mar. Biol. Assoc. U.K. 80 (2): 215-234.
Creative Commons Attribution 3.0 (CC BY 3.0)

© Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology

Source: National Museum of Natural History Collections

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Ecology

Habitat

Although Magelona johnstoni is only absent in coarse-grained sediments the species displays a clear preference for finer sediments (150 to 300 µm), where the species reaches a relative occurrence of > 40%. A similar spectrum of occurrence is found with regard to the mud content; Magelona johnstoni reaches the highest relative occurrence in sediments with a mud content of 10-20%.
  • 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.
Creative Commons Attribution 3.0 (CC BY 3.0)

© WoRMS for SMEBD

Source: World Register of Marine Species

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Depth range based on 343 specimens in 1 taxon.
Water temperature and chemistry ranges based on 212 samples.

Environmental ranges
  Depth range (m): 0.1 - 125
  Temperature range (°C): 7.150 - 11.513
  Nitrate (umol/L): 2.055 - 16.868
  Salinity (PPS): 31.982 - 34.882
  Oxygen (ml/l): 5.996 - 6.609
  Phosphate (umol/l): 0.353 - 0.890
  Silicate (umol/l): 2.172 - 11.419

Graphical representation

Depth range (m): 0.1 - 125

Temperature range (°C): 7.150 - 11.513

Nitrate (umol/L): 2.055 - 16.868

Salinity (PPS): 31.982 - 34.882

Oxygen (ml/l): 5.996 - 6.609

Phosphate (umol/l): 0.353 - 0.890

Silicate (umol/l): 2.172 - 11.419
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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