9d4cb96450f3302fc7eeabbab70e7954 English dataset NatureScot (HQ Inverness) data_supply@nature.scot pointOfContact 2025-06-03 MEDIN 3.1.2 EPSG Geodetic Parameter Registry 2021-01-06 revision WGS 84 2005 Scottish Natural Heritage (SNH) Loch Creran site condition monitoring survey of subtidal reefs 2006-12-31 publication GB-SCT-SNH-ME-000107-MRSNH01700000002-LC Marine Recorder NS-000106 NatureScot project ID The purpose of this survey was to initiate site condition monitoring of the biogenic and rocky reefs of Loch Creran. This survey took place between the 11th July and 23rd December 2005, run by Heriot Watt University for NatureScot (Scottish Natural Heritage at time of survey). The extent and distribution of serpulid reefs was determined from observations by divers along 110 transects around the loch between 11th-25th July 2005. Detailed studies were also performed at four of the major serpulid reef sites in the loch; distribution of the serpulid reefs was examined with sidescan sonar between 6th-8th September 2005, reef density by video and the community of organisms associated with the habitat by diver survey of the reefs themselves and of the surrounding sediment was undertaken between 23rd-26th July 2005. The distribution and abundance of Modiolus was also examined along seven relocatable transects and, at one of the major mussel beds, the size structure of the population and associated community surveyed. Scottish Natural Heritage (SNH) Scottish Natural Heritage (SNH), Headquaters Data Manager 01463 725000 data_supply@nature.scot owner NatureScot (HQ Inverness) NatureScot Data Manager data_supply@nature.scot custodian Scottish Natural Heritage (SNH) Scottish Natural Heritage (SNH), Headquaters Data Manager 01463 725000 data_supply@nature.scot originator Esther Hughes Data Archive for Seabed Species and Habitats (DASSH) Data Manager 01752 633102 dassh.enquiries@mba.ac.uk distributor notPlanned Marine Environmental Data and Information Network MEDIN metadata record availability 2025-06-03 revision NDGO0005 NDGO0005 2025-06-03 revision Habitats and biotopes GEMET - INSPIRE themes, version 1.0 2021-09-28 revision Habitat characterisation Habitat extent Zoobenthos taxonomic abundance Zoobenthos taxonomy-related counts SeaDataNet Parameter Discovery Vocabulary 2021-09-28 revision otherRestrictions This survey recorded no species or biotope occurrences that NatureScot consider as sensitive; all records may therefore be released in response to requests covered by Environmental Information Regulations or Freedom of Information Regulations; additionally its re-use and dissemination is permissible under Open Government Licence terms. Any re-use of this data will acknowledge the copyright owner. otherRestrictions No restriction on public access 200 English 8-bit variable size UCS Transfer Format, based on ISO/IEC 10646 biota environment oceans -5.4250 -5.2400 56.5070 56.5600 SeaVox salt and freshwater body gazetteer 2021-01-06 creation Inner Seas off the West Coast of Scotland Charting Progress 2 Sea Areas 2021-01-06 creation Minches and Western Scotland 2005-07-11 2005-12-23 SeaVoX Vertical Co-ordinate Coverages 2021-01-06 revision circalittoral SeaVoX Vertical Co-ordinate Coverages 2021-01-06 revision infralittoral Moore, Harries, Tulbure, Cook, Saunders, Lyndon, Kamphausen, James (2020) The current status of serpulid reefs, horse mussel beds and flame shell beds in Loch Creran SAC and MPA; Moore, Saunders, Harries, Mair, Bates, Lyndon (2006) The establishment of site condition monitoring of the subtidal reefs of Loch Creran Special Area of Conservation Database Marine Recorder Geographic Information System shapefile Image Documents Published report dataset MEDIN data guideline for side scan sonar (SSS) data 2018-10-08 publication See the referenced specification true MEDIN data guideline for video surveys of species and benthos 2018-01-23 publication See the referenced specification true Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services 2010-12-08 publication Bathymetric sidescan survey undertaken from 5th to 7th September 2005 using 117kHz transducers and motion reference unit and positional information from DGPS. Survey line spacing was chosen to give swath overlap and the acoustic data were continually monitored on the acquisition computer and a bottom coverage map produced in real-time in order to ensure full seafloor coverage. All depths are reduced to chart datum and all latitude and longitude positions are WGS84 datum. Survey output was a bathymetric grid with a horizontal resolution of 5m, from which contour maps were derived. Serpulid reefs (peripheral distribution survey) was undertaken to determine the extent and distribution of serpulid reefs by diver observations along 110 transects, approximately 250m apart, around the periphery of the loch between the 11th and 25th July 2005. Diver swam on a compass bearing perpendicular to the shore from chart datum to a nominal depth of 14m. Transect start and end points were fixed by DGPS from a surface vessel by recording the position of descent of diver and prior to ascent. Diver recorded depth at start and end of transect, depths of shallow and deep limits of reef distribution, and depth limits of medium and large reefs. Serpulid reefs (detailed studies at major sites) were undertaken using Sidescan sonar at four major serpulid reef sites in the loch between 6th and 8th September 2005. A 500kHz sidescan system was used. Track width of 35m to each side of the vessel was adopted and track spacing of 25m. Groundtruthing of sidescan mosaics was achieved by drop-down video. Video was recorded onto digital video tape, together with position and time of each frame using a video overlay system fed by data from DGPS. A diver video density survey to quantify Serpulid reef abundance from 23rd to 26th July 2005 was undertaken at four sites. Ten replicate video transects perpendicular to seabed contours, were worked by divers. The percentage of points overlying reef material gives an estimate of percentage cover of the seabed.