We managed to survey five areas in detail where Sabellaria spinulosa reef had been previously recorded , collecting 100% acoustic data in these blocks with accompanying video and grab samples. In some areas, it was very clear from the sidescan sonar signature that there was reef on the seabed. The image below demonstrates what I like to call a “mackerel’s back” pattern indicative of a well-developed reef in the centre (clearer in the darker areas).
|Areas of suspected Sabellaria spinulosa reef to the west of Saturn Reef in the North Norfolk Sandbanks and Saturn Reef SCI (JNCC/Cefas 2013)|
|Concretions of Sabellaria spinulosa tubes that will be assessed for “reefiness” when back in the laboratory (JNCC/Cefas 2013)|
|Sabellaria spinulosa worm tubes sampled using a Hamon grab (JNCC/Cefas 2013)|
|A processed Hamon grab sample ready to be preserved in formaldehyde (JNCC/Cefas 2013)|