BIOTIC

BIOTIC Species Information for Gammarus insensibilis
All Taxonomy Biology Distribution Reproduction

Researched by	Nicola White	Data supplied by	MarLIN
Refereed by	Dr Martin Sheader
Distribution and Habitat
Distribution in Britain & Ireland	In England, distribution is restricted to the central southern coast with two isolated east coast sites. Not recorded west of Fleet in Dorset and is absent from the lagoons of Cornwall.
Global distribution	South from the English Channel along the Atlantic coasts of Europe to the Mediterranean and in the Black Sea.
Biogeographic range	Not researched	Depth range	Restricted to depth of lagoons; 2-3 m max.
Migratory	Non-migratory / Resident
Distribution Additional Information	Distribution is restricted to southern parts of England and probably represents the northern limit of the species' range. Found in Dorset, Hampshire, Sussex, Isle of Wight, Essex and Kent in the south and isolated sites in Lincolnshire and Suffolk on the east coast. The species was present in Widewater lagoon, Sussex, but has not been recorded there since 1979. Other habitat characteristics are: a regular tidal input of seawater; a small tidal range; no or low freshwater input other than rainfall; water retained at all states of the tide and at all seasons; salinity within the range 10-58 psu, usually 15-35 psu, with seasonal variation.

Substratum preferences	Mud Muddy sand Sandy mud	Physiographic preferences	Isolated saline water (Lagoon)
Biological zone	Lower Littoral Fringe	Wave exposure	Very Sheltered Extremely Sheltered
Tidal stream strength/Water flow	Insufficient information	Salinity	See additional Information
Habitat Preferences Additional Information
Distribution References	Lincoln, 1979, Sheader & Sheader, 1985, Sheader & Sheader, 1987, Anonymous, 1999(s),