Scottish Marine And Freshwater Science Report Volume 14 No 1.

This metadata entry covers the data and R-code used to generate the Scottish Marine and Freshwater Science Report ‘Priority marine feature surveys within the Small Isles MPA and surrounding waters’, and the report itself.

Report abstract:
The Small Isles Marine Protected Area (MPA) is one of Scotland’s biggest inshore MPAs, covering more than 800 km2 and containing a complex mosaic of habitats. The six-year survey programme (2012 – 2017) conducted by Marine Scotland collected imagery of the seafloor within the Small Isles MPA: 9,374 digital images and 3,690 minutes of high definition video footage. This imagery was analysed to determine baseline abundances of eight seafloor invertebrate species with conservation importance related to Priority Marine Features. These imagery data showed that the Sound of Canna provides important habitat within the MPA. There were sufficient data to model changes in abundance over time for two species in four survey locations. The abundance of the Tall seapen (Funiculina quadrangularis) reduced after 2014, whilst the abundance of the Northern sea fan (Swiftia pallida) was stable over time. The potential impact of bottom-contacting towed fishing gear on the distribution of the Tall seapen in the wider area of the Minch, Inner Sound and Sea of Hebrides was also investigated. There was no evidence that fishing activity caused reductions in seapen abundance. However the analysis was limited by the available fishing data, which was at a broader scale (over space and time) than the abundance data. Finer scale fishing data would be needed for future studies to assess the impact of fishing activities on the abundance of seafloor invertebrate species. The results of this study provide a more extensive biological baseline of the Small Isles MPA than previously available, including more survey locations and repeat surveys over time. The data strengthen the biological evidence base underpinning the Scottish MPA network by improving our understanding of where species occur and identifying important locations for different species. The data could be used to help establish management measures to support an ecologically coherent MPA network by identifying where the abundances of some species have reduced. Continued surveying of the Small Isles MPA and the surrounding region is discussed with respect to monitoring changes in species abundance over space and time and assessing the effectiveness of any future management measures.

The dataset includes:
- All of the observations for digital still images, including biological, sediment, habitat and community data, and station metadata (2012 - 2017)
- A subset of observations for Priority Marine Feature (PMF) species or habitat components from digital still images where less than 25% of the image was obscured (2012 - 2017)
- All of the observations for high-definition video, including biological data and station metadata (2015, 2016, 2017)
- All of the observations for digital still images in the Funiculina quadrangularis fishing effects study, including F. quadrangularis counts, environmental data, VMS data and station metadata (2017)
- Spatial location of the survey boxes used in the PMF study (2012 - 2017)
- R-code to calculate the box-level densities for the PMF species or habitat components featured in the report
- R-code to calculate the effects of fishing intensity, depth, percentage mud, percentage gravel, salinity, seafloor slope, seafloor curvature, and study area (Sea of the Hebrides, the Inner Sound and the Minch) on F. quadrangularis counts as featured in the report
- R-code to calculate change in box-level densities for the Northern seafan Swiftia pallida and F. quadrangularis as part of the detailed case study in the report.

Please also consult the code and documentation on Github: https://github.com/MarineScotlandScience/Small-Isles_2012-17