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Effectiveness of acoustic cameras as tools for assessing biogenic structures formed by Sabellaria in highly turbid environments
Aquatic Conservation: Marine and Freshwater Ecosystems ( IF 2.4 ) Pub Date : 2020-03-06 , DOI: 10.1002/aqc.3313
Ross A. Griffin 1 , Robyn E. Jones 2 , Natasha E.L. Lough 3 , Charles P. Lindenbaum 3 , Maria C. Alvarez 4 , Katie A.J. Clark 5 , Jonathan D. Griffiths 4 , Peter A.T. Clabburn 4
Affiliation  

  1. Accurately mapping the extent and status of biogenic reefs formed by polychaete worms of the genus Sabellaria is of conservation importance given their protected status across Europe.
  2. Traditionally, side‐scan sonar (SSS) combined with ground‐truthing in the form of seabed photography and videography has been widely accepted as the most suitable approach for mapping these reefs in the subtidal zone. In highly turbid environments visibility at the seabed can be near zero, however, rendering optical‐based ground‐truthing redundant. Consequently, the true distribution and status of Sabellaria reefs in some shallow subtidal areas around the UK remains unclear despite their designation as Annex‐I features of several Special Areas of Conservation (SACs) under the Habitats Directive.
  3. Acoustic camera imagery (ACI) collected using acoustic cameras in two deployment configurations matched well with the backscatter signatures of seabed features in corresponding SSS data. The ACI was of suitable resolution for visualizing Sabellaria colony structures, allowing for their Annex‐I ‘reef’ defining attributes (extent, patchiness, and elevation) to be assessed. Colony formation ‘type’ was also distinguishable in the ACI, although confidence in differentiating between low‐lying Sabellaria formations and surrounding substrates was low, particularly when using a pole‐mounted configuration.
  4. This study provides a proof of concept for using acoustic cameras as tools for ground‐truthing SSS interpretation and assessing the status of Sabellaria bioconstructions in low‐visibility environments. Further development of this approach and incorporating it into statutory monitoring programmes could improve the management of the reef habitats in subtidal areas of the Severn Estuary and other highly turbid environments.


中文翻译:

声学相机作为评估在高浑浊环境中由沙贝氏菌形成的生物结构的工具的有效性

  1. 考虑到它们在欧洲的保护地位,准确绘制由沙贝菌属的多毛蠕虫形成的生物礁的范围和状况具有重要的保护意义。
  2. 传统上,侧面扫描声纳(SSS)结合海底摄影和摄像形式的地面真相已被广泛接受为在潮下带绘制这些礁石的最合适方法。在高度混浊的环境中,海底的能见度可能接近于零,但是,这使基于光学的地面修整变得多余。因此,尽管有人栖息地指令将其指定为几个特别保护区(SAC)的附件一特征,但英国周围某些浅潮下带的沙贝礁的真实分布和状况仍不清楚。
  3. 使用声学相机以两种部署配置收集的声学相机图像(ACI)与相应SSS数据中海底特征的后向散射特征非常匹配。ACI具有合适的分辨率,可用于可视化虎耳草菌落的菌落结构,从而可以评估其附件I“礁石”的定义属性(程度,斑驳度和海拔)。菌落形成的“类型”在ACI中也是可区分的,尽管区分低洼的Sabellaria形成物和周围底物的信心很低,尤其是在使用杆装配置的情况下。
  4. 这项研究提供了使用声学相机作为地面SSS解释工具和评估低可见性环境中Sabellaria生物构造状态的概念证明。对该方法的进一步发展并将其纳入法定的监测计划可以改善对塞文河口潮下带和其他高度浑浊环境中礁石栖息地的管理。
更新日期:2020-03-06
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