BIOTIC

BIOTIC Species Information for Jassa falcata
All Taxonomy Biology Distribution Reproduction

Researched by	Jacqueline Hill	Data supplied by	MarLIN
Refereed by	Prof. P. Geoff Moore
Distribution and Habitat
Distribution in Britain & Ireland	Found on all British coasts. Reported from several sites around the coast of Ireland.
Global distribution	Cosmopolitan in temperate and warm-temperate waters; widespread and frequently recorded in Atlantic, Pacific and Indian Oceans, both north and south of the equator. Reported from most coastal regions of North East Atlantic, and often locally abundant.
Biogeographic range	Not researched	Depth range	Lower eulittoral to 5 m
Migratory	Non-migratory / Resident
Distribution Additional Information	This species is an important fouling organism. The animals construct tubes from pieces of debris and sediment cemented together, often forming dense mats, particularly in warm water discharge pipes from power stations (Fish & Fish, 1996). Reported to depths of 5m in Japan (Kamenskaya, 1977). Jassa falcata is often found inhabiting Laminaria holdfasts and so may be found at the greater depths inhabited by some kelps. Jassa falcata appears to be out-competed by Parajassa pelagica or unable to survive in very strong wave action at shallow depths (K. Hiscock personal communication).

Substratum preferences	Other species (see additional information) Algae Artificial (e.g. metal/wood/concrete) Bedrock	Physiographic preferences	Open coast Strait / sound Enclosed coast / Embayment
Biological zone	Lower Eulittoral Sublittoral Fringe Upper Infralittoral	Wave exposure	Very Exposed Exposed Moderately Exposed Sheltered
Tidal stream strength/Water flow	Strong (3-6 kn) Moderately Strong (1-3 kn)	Salinity	Full (30-40 psu)
Habitat Preferences Additional Information
Distribution References	Hayward & Ryland, 1995b, Lincoln, 1979, Picton & Costello, 1998, Costello et al., 1989,