e5d667aa-4a53-40e0-aa36-cfc521984602 Joint Nature Conservation Committee Marine Mapping Scientist Monkstone House, City Road Peterborough Cambridgeshire PE1 1JY UK Graeme.Duncan@jncc.gov.uk http://www.jncc.gov.uk 2022-02-18T09:57:09 ISO 19115:2003/19139 1.0 UTM 30N Acoustic mapping of the seabed of the Menai Strait. South West Menai. GB100088 1994-12-31 The section of the Menai Straits that were surveyed were divided into three parts. The hardness/roughness isopleths were combined using CAMRIS GIS to produce a composite map showing 7 types of group (very hard/very rough; hard/rough; moderately hard/moderately rough; moderately soft/moderately smooth; soft/moderately rough; soft/smooth; very soft/very smooth). A map for the whole of the survey area was followed by a map showing the biotope types as observed using the remote video, which are as follows (SA = superabundant; A = abundant; C = common; O = occasional) Sand/shell: Medium fine sand with shell: very silty. Coarse sand/silt: Coarse sand: very silty. Gravel: Barren Silty cobble: Silt accretion (A); Cerianthus (O-C); Urticina (O-C). Silty cobble/rich: Silt accretion (A); sponges (Haliclona, Halichondria) (C); hydroids (C); Urticina (O-C). Boulder/cobble sponge: Similar to above, but with sponges C-A. Cobble/bounder faunal turf: Hydroids (C); Tubularia (O); Alcyonium(O); Flustra(O). Cobble hydroid turf: Short turf of hydroids (C-A). Cobble Pomatoceros: Pomatoceros and barnacles (A). Bedrock/boulder silt sponge: Similar to boulder/cobble sponge above, but on bedrock/boulder. Boulder Laminaria: Small Laminaria hyperboraea (C); red algal turf (C). Bedrock sponge/Flustra: Bedrock with encrusting sponges (C-A) and Flustra (O-C). Bedrock Mytilus. Small Mytilus (A-SA); Asteria(C-SA); encrusting corralines (O). Bedrock and faunal turf: Hydroids (C); Tubularia(O); Alcyonium(O); encrusting and branching sponges(O-C). The maps were subsequently transposed into EUNIS in 2006 using expert judgement. Nature conservation Natural Resources Wales +44 (0)8451 306229 Maes-y-Ffynnon, Penrhosgarnedd Bangor LL57 2DW UK enquiries@naturalresourceswales.gov.uk https://naturalresources.wales/?lang=en Habitats title 2006-06-26 Menai strate Available under the OGL license 2.0 oceans 1994-05-01T00:00:00 1994-05-31T00:00:00 -4.21393392 -4.19260428 53.19464904 53.21364354 Countryside Council for Wales| Marine Data Manager, Bangor Marine Data Manager +44 (0)1248 385547 Maes-y-Ffynnon, Penrhosgarnedd Bangor LL57 2DW UK j.dargie@ccw.gov.uk www.ccw.gov.uk The Countryside Council for Wales is the Government's statutory adviser on sustaining natural beauty, wildlife and the opportunity for outdoor enjoyment in Wales and its inshore waters. One of the roles of the Countryside Council for Wales (CCW) is to help ensure the conservation and environmentally sustainable management of the Welsh coast and seas by providing advice on the effects of developments and activities. Marine staff in CCW carry out surveys and research on the distribution of habitats and species and on their sensitivity to change. Recent marine mapping surveys include the Sarnau reefs in Cardigan Bay and the horse mussel beds north of the Llyn Peninsula, in addition an in-house survey of intertidal habitats throughout Wales using CCW's Marine phase 1 Intertidal Survey Methodology. Unknown Unknown https://ows.emodnet-seabedhabitats.eu/geoserver/emodnet_view_maplibrary/wms? OGC:WMS gb100088 View map "GB100088" through the EMODnet Seabed Habitats "Map Library" Web Map Service https://ows.emodnet-seabedhabitats.eu/geoserver/emodnet_open_maplibrary/wfs? OGC:WFS gb100088 Access data from map "GB100088" through the EMODnet Seabed Habitats "Map Library" Web Feature Service https://files.emodnet-seabedhabitats.eu/data/EMODnetSBHsurvey_GB100088.zip WWW:LINK-1.0-http--link EMODnet Seabed Habitats download MESH Confidence Assessment https://www.emodnet-seabedhabitats.eu/resources/mesh-archive/ RemoteTechnique An assessment of whether the remote techniques used to produce this map were appropriate to the environment they were used to survey: 3 = technique(s) highly appropriate 2 = technique(s) moderately appropriate 1 = technique(s) inappropriate RemoteCoverage An assessment of the coverage of the remote sensing data including consideration of heterogeneity of the seabed: (See Coverage X Heterogeneity matrix below) Coverage scores - use these to determine coverage then combine with heterogeneity assessment to derive finale scores3 = good coverage; 100% (or greater) coverage or AGDS track spacing <50m2 = moderate coverage; swath approx 50% coverage or AGDS track spacing >100m1 = poor coverage; large gaps between swaths or AGDS track spacing > 100mFinal scores3 = good coverage OR moderate coverage + low heterogeneity2 = moderate coverage + moderate heterogeneity OR poor coverage + low heterogeneity 1 = moderate coverage + high heterogeneity OR poor coverage + moderate or high heterogeneity RemotePositioning An indication of the positioning method used for the remote data:3 = differential GPS2 = GPS (not differential) or other non-satellite 'electronic' navigation system1 = chart based navigation, or dead-reckoning RemoteStdsApplied An assessment of whether standards have been applied to the collection of the remote data. This field gives an indication of whether some data quality control has been carried out:3 = remote data collected to approved standards2 = remote data collected to ?internal? standards1 = no standards applied to the collection of the remote data RemoteVintage An indication of the age of the remote data:3 = < 5yrs old.2 = 5 to 10 yrs old.1 = > 10 years old BGTTechnique An assessment of whether the ground-truthing techniques used to produce this map were appropriate to the environment they were used to survey. Use scores for soft or hard substrata as appropriate to the area surveyed.Soft substrata predominate (i.e. those having infauna and epifauna)3 = infauna AND epifauna sampled AND observed (video/stills, direct human observation)2= infauna AND epifauna sampled, but NOT observed (video/stills, direct human observation)1 = infauna OR epifauna sampled, but not both. No observation.Hard substrata predominate (i.e. those with no infauna)3 = sampling included direct human observation (shore survey or diver survey)2 = sampling included video or stills but NO direct human observation1 = benthic sampling only (e.g. grabs, trawls) PGTTechnique An assessment of whether the combination of geophysical sampling techniques were appropriate to the environment they were used to survey. Use scores for soft or hard substrata as appropriate to the area surveyed.Soft substrata predominate (i.e. gravel, sand, mud)3 = full geophysical analysis (i.e. granulometry and/or geophysical testing (penetrometry, shear strenght etc))2 = sediments described following visual inspection of grab or core samples (e.g. slightly shelly, muddy sand)1 = sediments described on the basis of remote observation (by camera).Hard substrata predominate (i.e. rock outcrops, boulders, cobbles)3 = sampling included in-situ, direct human observation (shore survey or diver survey)2 = sampling included video or photographic observation, but NO in-situ, direct human observation1 = samples obtained only by rock dredge (or similar) GTPositioning An indication of the positioning method used for the ground-truth data:3 = differential GPS2 = GPS (not differential) or other non-satellite 'electronic' navigation system1 = chart based navigation, or dead-reckoning GTDensity An assessment of what proportion of the polygons or classes (groups of polygons with the same ?habitat? attribute) actually contain ground-truth data:3 = Every class in the map classification was sampled at least 3 times2 = Every class in the map classification was sampled1 = Not all classes in the map classification were sampled (some classes have no ground-truth data) GTStdsApplied An assessment of whether standards have been applied to the collection of the ground-truth data. This field gives an indication of whether some data quality control has been carried out:3 = ground-truth samples collected to approved standards2 = ground-truth samples collected to 'internal' standards1 = no standards applied to the collection of ground-truth samples GTVintage An indication of the age of the ground-truth data:3 = < 5 yrs old2 = 5 to 10 yrs old1 = > 10 years old GTInterpretation An indication of the confidence in the biological interpretation of the ground-truthing data:3 = Evidence of expert interpretation; full descriptions and taxon list provided for each habitat class2 = Evidence of expert interpretation, but no detailed description or taxon list supplied for each habitat class1 = No evidence of expert interpretation; limited descriptions available RemoteInterpretation An indication of the confidence in the interpretation of the remotely sensed data:3 = Appropriate technique used and documentation provided2 = Appropriate technique used but no documentation provided1 = Inappropriate technique usedNote that interpretation techniques can range from ?by eye? digitising of side scan by experts to statistical classification techniques. DetailLevel The level of detail to which the 'habitat' classes in the map have been classified:3 = Classes defined on the basis of detailed biological analysis2 = Classes defined on the basis of major characterising species or lifeforms1 = Classes defined on the basis of physical information, or broad biological zones MapAccuracy A test of the accuracy of the map:3 = high accuracy, proven by external accuracy assessment2 = high accuracy, proven by internal accuracy assessment1 = low accuracy, proved by either external or internal assessment OR no accuracy assessment made Remote GT Interpretation Survey technique(s): Towed video ; Diver survey ; AGDS Classification scheme: Lifeforms Classification scheme details: 7 Lifeform categories Survey technique details: Track spacing of whole area: 0.25km. Areas of interest: 0.125km spacing. Ground truthed by towed video recorder and scuba diving. Newcastle University Newcastle University Mapping method: Supervised classification