On a return crossing from Biscay through the English Channel in February, BDRP and its affiliated Spanish research organisation AMBAR (Sociedad para Estudio y la Conservacion de la Fauna Marina) encountered an unusual sight – two separate large groups of Risso’s Dolphin. This particular species of dolphin tends to be encountered sporadically by BDRP in small groups of 2 – 6 animals over deep waters in Biscay.
BDRP Research Director, Dr Tom Brereton, commented: “In over 13 years of research in the Channel and Biscay, BDRP have never before recorded Risso’s Dolphin in the group sizes encountered this month.
The first group numbered 26 and included 4 young dolphins, the second group, which was observed further into the Channel, numbered 40 dolphins. BDRP Chairman Clive Martin said: “Both groups seemed to be travelling from North to South and may have been part of a mass migration from colder, more northerly waters”.
This species has a unique appearance; pale grey-coloured, robust, blunt headed dolphins with a prominent dorsal fin and lacking a beak. They are often highly scarred due to fighting between individuals and tend to be more sedate than other dolphins.
BDRP researcher and PR Officer, Adrian Shephard commented: “Risso’s Dolphin are frequently encountered off the Welsh coastline and in the Irish sea by our affiliated research organisation and charity; SeaTrust”. Cliff Benson who heads SeaTrust records this species from both land and sea-based surveys, but again in relatively small groups.
BDRP continues to monitor the Channel and Biscay for a re-appearance of these large groups of Risso’s Dolphin together with other species with the aim of understanding their behaviour, movements and the threats they face.
Marinelife is a Charitable Limited Company established to co-ordinate and develop a growing portfolio of global research and monitoring projects. Through these we aim to further the conservation of the wildlife of coasts and oceans through scientific investigation and educational activities. Marinelife continues to work in partnership with a number of other research groups, spearheading an international initiative, the Atlantic Research Coalition (ARC) that aims to describe changes in the status of whales and dolphins at a European scale.
Adrian Shephard | alfa
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