Fig 1.
Locations of investigated platforms.
Studied locations of five gas platforms in the southern North Sea (○) with bathymetry.
Table 1.
Platform locations, distance from shore, maximum observed depths on the footage, year of installation of the platform, community age (years since last cleaning activities) at the time the video was recorded, for depths < 10 m >.
Table 2.
Different classes with corresponding analysis value.
Table 3.
All observed taxa (●) per platform with detectability scores (≤6 = low, >6 high).
Table 4.
Averaged categorised abundance of the 11 high detectable taxa, with 95% confidence interval around the mean, per depth band on platform P1.
Table 5.
Averaged categorised abundance of the 11 high detectable taxa, with 95% confidence interval around the mean, per depth band on platform P2.
Table 6.
Averaged categorised abundance of the 11 high detectable taxa, with 95% confidence interval around the mean, per depth band on platform P3.
Table 7.
Averaged categorised abundance of the 11 high detectable taxa, with 95% confidence interval around the mean, per depth band on platform P4.
Table 8.
Averaged categorised abundance of the 11 high detectable taxa, with 95% confidence interval around the mean, per depth band on platform P5.
Fig 2.
Species richness per platform & depth band.
Boxplot showing the number of species per sample (n = 215), per platform with all depths combined (left image) and per depth-band with all platforms (n = 5) combined.
Fig 3.
Modelled relation of species richness (S) with depth.
Plot of the fitted Generalised Additive Model smoother showing the significant non-linear effect of depth (p = 0.001) on the species richness (S) on all platforms.
Table 9.
PERMANOVA on variables that influence species assemblages significantly.