Subtidal natural hard substrates (SNHS) promote occupancy by rich benthic communities that provide irreplaceable and fundamental ecosystem functions, representing a global priority target for nature conservation and recognised in most European environmental legislation. However, scientifically validated methodologies for their quantitative spatial demarcation, including information on species occupancy and fine-scale environmental drivers (e.g., the effect of stone size on colonisation) are rare. This is, however, crucial information for sound ecological management. In this investigation, high-resolution (1 m) multibeam echosounder (MBES) depth and backscatter data and derivates, underwater imagery (UI) by video drop-frame, and grab sediment samples, all acquired within 32 km2 of seafloor in offshore Belgian waters, were integrated to produce a random forest (RF) spatial model, predicting the continuous distribution of the seafloor areal cover/m2 of the stones’ grain sizes promoting colonisation by sessile epilithic organisms. A semi-automated UI acquisition, processing, and analytical workflow was set up to quantitatively study the colonisation proportion of different grain sizes, identifying the colonisation potential to begin at stones with grain sizes Ø ≥ 2 cm. This parameter (i.e., % areal cover of stones Ø ≥ 2 cm/m2) was selected as the response variable for spatial predictive modelling. The model output is presented along with a protocol of error and uncertainty estimation. RF is confirmed as an accurate, versatile, and transferable mapping methodology, applicable to area-wide mapping of SNHS. UI is confirmed as an essential aid to acoustic seafloor classification, providing spatially representative numerical observations needed to carry out quantitative seafloor modelling of ecologically relevant parameters. This contribution sheds innovative insights into the ecologically relevant delineation of subtidal natural reef habitat, exploiting state-of-the-art underwater remote sensing and acoustic seafloor classification approaches.
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RBINS Staff Publications 2021
Today, collaboration between scienti fi c research and civil society is growing signi fi cantly. The general public ’ s curiosity drives it to engage with the scienti fi c process and culture and in the search for solutions to complex issues (economic, social, health, environmental, cultural, educational, or ethical). Clari fi cation is needed to differentiate between occupational scienti fi c activity and citizen-based science. They do not require the same scienti fi c and technical skills despite using similar equipment and their legal and administrative frameworks being totally different. The confusion created by the indiscriminate use of the same term “ scienti fi c diving ” to refer to different training courses and activities compromises the quality of existing occupational standards and, ultimately, has a negative impact on the safety of the activity at work. A clear de fi nition of Citizen Scienti fi c Diving and Occupational Scienti fi c Diving makes it possible to differentiate between the objectives and target groups of these two activities and their legal framework. There is a need to establish an accepted and shared standard in the occupational fi eld and to ensure the mobility of scientists. A long process undertaken by a motivated scienti fi c community (late 1980s-2000s) led to the establishment of European initial training standards for Occupational Scienti fi c Diving through the ESDP-European Scienti fi c Diving Panel ( fi rstly under the aegis of the European Marine Board, now of the MARS-European marine stations network). The quality and general acceptance of these standards by a large part of the European scienti fi c community have already adopted them in the occupational health and safety legislation of seven European countries (Belgium, Finland, France, Germany, Norway, Sweden, and the UK in 2023). Adopting them in other countries ’ health and safety legislation is still desirable. This will increase their recognition, acceptance and use for the bene fi t of scienti fi c work. Building bridges between academic science and non-academic citizen science is possible and this is done by developing coherent projects that produce results that bene fi t both science and society. While distinguishing between the two, as an added value, this approach could better guide the recreational diving training sector in developing a new market.
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RBINS Staff Publications 2023
