BIOTIC Species Information for Nephtys hombergii
|Researched by||Lizzie Tyler||Data supplied by||University of Sheffield|
|Refereed by||This information is not refereed.|
|Distribution and Habitat|
|Distribution in Britain & Ireland||Found throughout Britain and Ireland.|
|Global distribution||Found from the northern Atlantic, from such areas as the Barents Sea, the Baltic and the North Sea, to the Mediterranean. Nephtys hombergii has been reported from as far south as South Africa.|
|Biogeographic range||Not researched||Depth range|
|Migratory||Non-migratory / Resident|
|Distribution Additional Information||Maximum densities of Nephtys hombergii tend to occur in the lower part of the intertidal that is also occupied by %Arenicola marina% (Clark & Haderlie, 1960; Clark et al., 1962) but Nephtys hombergii has been collected from dredge hauls at various depths.
On some shores, the intertidal zonation of Nephtys hombergii is probably determined by the type of substratum found at various levels (Clark & Haderlie, 1960).
Although the species may colonize a variety of substrata, Nephtys hombergii may be found in higher densities in muddy environments and this tends to isolate it from %Nephtys cirrosa%,
which is characteristic of cleaner, fairly coarse sand.
High densities of Nephtys hombergii were found in substrata of 0.3% particles >0.25mm and 5.8% <0.125mm in diameter but the worm tolerated up to 3.8% 0.25mm and 2.2-15.9% <0.125mm (Clark et al.,1962).
Nephtys species penetrate into the mouths of estuaries and estuarine lagoons until the salinity falls below 20 psu, but Nephtys hombergii occasionally extends into waters with a salinity <18 psu (Barnes, 1994). Clark & Haderlie (1960) found Nephtys hombergii in the Bristol Channel at salinities between 15.9 psu and 25.1 psu.
|Substratum preferences||Coarse clean sand
Fine clean sand
|Physiographic preferences||Open coast
Enclosed coast / Embayment
|Biological zone||Mid Eulittoral
|Wave exposure||Moderately Exposed
|Tidal stream strength/Water flow||Insufficient information
||Salinity||Variable (18-40 psu)
Reduced (18-30 psu)
|Habitat Preferences Additional Information||None entered|
|Distribution References||Rainer, 1989, Rainer, 1990, Hayward & Ryland, 1995b, Hayward et al., 1996, Rainer, 1991, Fish & Fish, 1996, Clark & Haderlie, 1960, Clark et al., 1962, Barnes, 1994, Clay, 1967(f), Alheit, 1978, Hayward & Ryland, 1990, Julie Bremner, unpub data,|