Strangford Lough Ecological Change Investigation WorkshopRecent changes in the distribution of some intertidal molluscs Julia Nunn Centre for Environmental Data and Recording Ulster Museum
History of recording intertidal marine molluscs in Strangford Lough • early 19th century: Dickie (published 1858) • 1940’s-1950’s: Williams (published 1954) • 1960’s - 1970’s: Queen’s University • 1984-1987: Northern Ireland Littoral Survey • 1989-1992: M.Sc. Nunn (published 1994) • 1999 onwards: Biotope mapping Queen’s University • 2003 SLECI
Ostrea edulis L., 1758 all records pre-1994
Gibbula umbilicalis1952-1953 Gibbula umbilicalisall records to 2003
Gibbula umbilicalis recording history in Strangford Lough • Dickie (published 1858) • 1940’s-1950’s Williams (published 1954) • Northern Ireland Littoral Survey • 1989-1992 M.Sc.
Osilinus lineatus 1952-53 Osilinus lineatusall records to 2003
Osilinus lineatus recording history post 1993 • St John’s Point • Phennick, Ardglass • Benderg Bay
Kilclief Bay 15.8.03 near sewage plant 17.8.03
Osilinus lineatus Strangford Lough all records to 2003 including negative
Summary • The status of some intertidal species recorded from Strangford Lough (known to be at the limits of their range in the north of Ireland), has been discussed • Gibbula umbilicalis is reported for the first time from the main body of Strangford Lough in 1999, where it is now abundant • Osilinus lineatus is reported for the first time from Strangford Lough in 2003 extending its northern limit on the east coast of Ireland by more than 17km. Settlement in the Narrows and main Lough took place progressively during the late 1990's and has continued into the years 2000 & 2001.