Pierre Noire

Name of the station

Pierre Noire


29 - Finistère


Station Biologique Roscoff


Céline HOUBIN (houbin@sb-roscoff.fr)

WFD water mass

FRGC11 - Baie de Morlaix



48.7083 (WGS84)

-3.8662 (WGS84)

Start of the survey


Periodicity of the survey

Two times per year

Surveyed parameters

Benthic invertebrate macrofauna abundances (> 1mm)
Benthic fish abundance

δ13C and δ15N of macrofauna (invertebrates and fish)
Organic matter

Neighbourhood of other NOS

Somlit, Phytobs, Coast-HF, Sonel

Direct access to data



This long-term survey was initiated following the pollution of the bay by oil from the Amoco Cadiz in March 1978.

The point is 0.3 miles south-east of the Pierre Noire beacon (NE of Morlaix Bay) at a depth of 17 metres from the chart datum on fine sand Abra alba-Hyalinoecia bilineata community.

Sampling is done using a Smith McIntyre grab (10 unit samples of 0.1 m2 at each survey for a total area of 1 m2). Sieving is carried out on a 1 mm circular mesh. Samples are fixed to 10 % neutral formalin.

Sampling frequencies have changed over time: 12/year from 1977 to 1985, 5/year from 1986 to 2007, 2/year since 2008.

The Pierre Noire site has been a DCE support site since 2007.

Related bibliography

Dauvin J.-C., 1984. Dynamique d'écosystèmes macrobenthiques des fonds sédimentaires de la baie de Morlaix et leur perturbation par les hydrocarbures de l'Amoco Cadiz. Thèse de doctorat d'État, Université de Paris VI, 456 p. + annexes 192 p.

Dauvin J.-C., 1998. The fine sand Abra alba community of the Bay of Morlaix twenty years after the Amoco Cadiz oil spill. Marine Pollution Bulletin, 36, 669-676

Thiébaut E., Bacouillard L., Dauvin J.-C., Gentil F., Houbin C., Broudin C. & Somerfield P. J. S. (submitted). Long-term changes in the taxonomic and trait-based biodiversity and community structure of the macrobenthos in the Bay of Morlaix (western English Channel) over the last 40 years.