Acoustic mapping of the Seabed of the Menai Strait. North East Menai.

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: Bar 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.本次勘测的梅奈海峡（Menai Straits）区段被划分为三个部分。 研究团队借助CAMRIS地理信息系统（GIS）将硬度/粗糙度等值线进行融合，生成包含7种类别的合成地图：极硬/极粗糙、硬/粗糙、中等硬度/中等粗糙、中等柔软/中等光滑、软/中等粗糙、软/光滑以及极软/极光滑。 整张勘测区域的地图之后，附带了基于远程视频观测得到的生境类型分布图，各生境类型及对应丰度等级如下（SA：极多；A：丰富；C：常见；O：偶见）： 砂/贝壳生境：含贝壳的中细砂，且粉砂含量极高。 粗砂/粉砂生境：粗砂基质，且粉砂含量极高。 砾石生境：砾石滩。 粉砂质卵石生境：粉砂淤积（丰度A）；筒花海葵（Cerianthus）（丰度O-C）；海葵（Urticina）（丰度O-C）。 富粉砂质卵石生境：粉砂淤积（丰度A）；海绵（Haliclona、Halichondria属）（丰度C）；水螅虫（丰度C）；海葵（Urticina）（丰度O-C）。 砾石/卵石海绵生境：与上述生境类似，但海绵丰度为C-A。 卵石/砾石动物垫群落生境：水螅虫（丰度C）；筒螅（Tubularia）（丰度O）；软珊瑚（Alcyonium）（丰度O）；膜孔苔虫（Flustra）（丰度O）。 卵石水螅虫垫生境：由水螅虫构成的短垫群落（丰度C-A）。 卵石龙介虫（Pomatoceros）生境：龙介虫与藤壶（丰度A）。 基岩/砾石粉砂海绵生境：与上述砾石/卵石海绵生境类似，但附着于基岩/砾石之上。 砾石海带生境：小型海带（Laminaria hyperboraea）（丰度C）；红藻垫群落（丰度C）。 基岩海绵/膜孔苔虫生境：基岩表面附着有结壳海绵（丰度C-A）与膜孔苔虫（Flustra）（丰度O-C）。 基岩贻贝生境：小型贻贝（Mytilus）（丰度A-SA）；海星（Asteria）（丰度C-SA）；结壳珊瑚藻（丰度O）。 基岩与动物垫群落生境：水螅虫（丰度C）；筒螅（Tubularia）（丰度O）；软珊瑚（Alcyonium）（丰度O）；结壳与分枝状海绵（丰度O-C）。 上述地图随后于2006年通过专家研判，被转换为符合欧洲自然信息系统（EUNIS）标准的格式。