Supporting Information. Jansen, J., P. K. Dunstan, N. A. Hill, P. Koubbi, J. Melbourne-Thomas, R. Causse, and C. R. Johnson. 2020. Integrated assessment of the spatial distribution and structural dynamics of deep benthic marine communities. Ecological Applications. Appendix S1 Figure S1 Observed total counts of demersal fish per main feeding-type and species archetype. The underlying maps indicate the spatial distribution of the probability of occurrence for each species archetype. The big aggregation of zoobenthos-feeding fish in SA-B is a school of Trematomus tokarevi. Appendix S1: Page 1 Figure S2 Observed total abundances of benthic macro-invertebrates per main feeding-type and species archetype from Jansen et al. (2018a). The underlying maps indicate the spatial distribution of the probability of occurrence for each species archetype. OTUs= Operational taxonomic units (= species or other groups of morphologically resembling fauna identified to the highest possible taxonomic resolution). Letters F-K identify each species archetype and are identical to the letters used in Fig. 5. Appendix S1: Page 2 Figure S3 Predicted values from the species archetype models versus observed values from the sample-sites (the probability of occurrence across all species in each species archetype). The red dotted line indicates the 1:1 line between predicted and observed values; the R2-value is for a linear regression between observed and predicted values. The predictions are based on trawl-data from 68 sites. From top to bottom: SA-A (Species Archetype - A) to SA-E SA-A SA-B SA-C SA-D SA-E Appendix S1: Page 3 Figure S4 Hard classed distribution of five species archetype predictions for demersal fish across the George V shelf, East Antarctica. Map (a) identifies which group of species is most likely to be encountered at any specific prediction point across the study area. (b) shows the probability of occurrence for the most likely archetype. Appendix S1: Page 4 Figure S5 Hard classed categorisation of the George V shelf, East Antarctica from kmeans clustering of the species archetype models of both demersal fish and benthic invertebrates. K-means clustering on four clusters is done using the probability of occurrence of each species archetype (both invertebrates and fish) in each cell of the environmental raster. Note the clustering based on the species archetype models does not separate out the shallow-steep habitat well when comparing only depth and slope of the sample sites (only 2 and 4 sample-locations for invertebrates and fish respectively). Map (a) show the distribution of the four habitats. Plot (b) shows the categorisation of each sample with respect to the depth and slope of the seafloor. Appendix S1: Page 5 Figure S6 Cross-comparison of changes in macro-invertebrate and fish functional groups between major Antarctic benthic habitats. The top-right part of the figure shows the change between habitats for each functional group, as predicted from the qualitative network model (the difference in total positive outcomes after 10000 press-perturbations). The bottom-left shows the observed change in functional group abundances from sample sites located in the different habitats (see Appendix S1: Figure S5 and methods for details on the calculation). Appendix S1: Page 6 Table S1 Taxonomic family, species identity, feeding-type and associated species archetype (where species archetype association is ≥ 0.8; colour coded for easier interpretation) for each demersal fish-species used in this study. The last column identifies the source used to identify the feeding-type. Sub-families are identified for the Nototheniidae (Nototh.). * = feeding-type information from unpublished data Family Species Feeding-type Species Archetype Reference Nototh. - Artedidraconidae Artedidraco loennbergi zoobenthos SA-E (wide distr., medium depth) www.fishbase.se Nototh. - Artedidraconidae Artedidraco shackletoni zoobenthos SA-D (banks) www.fishbase.se Nototh. - Artedidraconidae Artedidraco skottsbergi zoobenthos SA-D (banks) www.fishbase.se Nototh. - Artedidraconidae Dolloidraco longedorsalis zoobenthos SA-A (basins - common species) www.fishbase.se Nototh. - Artedidraconidae Histiodraco velifer zooplankton SA-D (banks) www.fishbase.se Nototh. - Artedidraconidae Pogonophryne phyllopogon zoobenthos SA-D (banks) Lombarte et al. (2003) Nototh. - Artedidraconidae Pogonophryne maculatus zoobenthos SA-B (basins - rare species) Lombarte et al. (2003) Nototh. - Artedidraconidae Pogonophryne sp. zoobenthos SA-B (basins - rare species) Lombarte et al. (2003) Nototh. - Bathydraconidae Acanthodraco dewitti Nototh. - Bathydraconidae Akarotaxis nudiceps SA-A (basins - common species) www.fishbase.se Nototh. - Bathydraconidae Bathydraco antarcticus SA-B (basins - rare species) Nototh. - Bathydraconidae Bathydraco macrolepis SA-B (basins - rare species) www.fishbase.se Nototh. - Bathydraconidae Bathydraco marri SA-B (basins - rare species) Nototh. - Bathydraconidae Cygnodraco mawsoni nekton SA-D (banks) www.fishbase.se Nototh. - Bathydraconidae Gerlachea australis zooplankton SA-A (basins - common species) www.fishbase.se Nototh. - Bathydraconidae Gymnodraco acuticeps nekton SA-D (banks) www.fishbase.se Nototh. - Bathydraconidae Prionodraco evansii zoobenthos SA-D (banks) www.fishbase.se Nototh. - Bathydraconidae Racovitzia glacialis zooplankton SA-E (wide distr., medium depth) www.fishbase.se Nototh. - Bathydraconidae Vomeridens infuscipinnis SA-A (basins - common species) www.fishbase.se Nototh. - Channichthyidae Chaenodraco wilsoni zooplankton SA-B (basins - rare species) www.fishbase.se Nototh. - Channichthyidae Chionobathyscus dewitti zooplankton SA-C (shelf-break) www.fishbase.se Nototh. - Channichthyidae Chionodraco hamatus nekton SA-E (wide distr., medium depth) www.fishbase.se Nototh. - Channichthyidae Chionodraco myersi zooplankton SA-B (basins - rare species) www.fishbase.se Nototh. - Channichthyidae Cryodraco antarcticus zooplankton SA-E (wide distr., medium depth) www.fishbase.se Nototh. - Channichthyidae Dacodraco hunteri SA-B (basins - rare species) www.fishbase.se Nototh. - Channichthyidae Neopagetopsis ionah zooplankton SA-C (shelf-break) www.fishbase.se Nototh. - Channichthyidae Pagetopsis macropterus nekton SA-D (banks) www.fishbase.se Nototh. - Channichthyidae Pagetopsis maculatus nekton SA-D (banks) www.fishbase.se; * Nototh. - Nototheniidae Trematomus eulepidotus zooplankton SA-E (wide distr., medium depth) www.fishbase.se Nototh. - Nototheniidae Trematomus hansoni zooplankton www.fishbase.se Nototh. - Nototheniidae Trematomus lepidorhinus/loennbergii zoobenthos SA-E (wide distr., medium depth) Nototh. - Nototheniidae Trematomus newnesi zooplankton SA-B (basins - rare species) www.fishbase.se Nototh. - Nototheniidae Trematomus pennellii zoobenthos SA-D (banks) www.fishbase.se Nototh. - Nototheniidae Trematomus scotti zooplankton SA-E (wide distr., medium depth) www.fishbase.se Nototh. - Nototheniidae Trematomus tokarevi zoobenthos SA-B (basins - rare species) www.fishbase.se Liparidae Careproctus longipectoralis zoobenthos SA-C (shelf-break) Duhamel et al. (2010) Liparidae Edentoliparis terraenovae zooplankton SA-B (basins - rare species) Duhamel et al. (2010) Liparidae Paraliparis antarcticus zoobenthos SA-B (basins - rare species) Duhamel et al. (2010) Liparidae Paraliparis charcoti zoobenthos SA-B (basins - rare species) Duhamel et al. (2010) Liparidae Paraliparis leobergi zoobenthos SA-D (banks) Duhamel et al. (2010) Liparidae Paraliparis mawsoni zoobenthos SA-C (shelf-break) Duhamel et al. (2010) Liparidae Paraliparis valentinae zoobenthos Duhamel et al. (2010) Macrouridae Macrourus whitsoni zoobenthos SA-C (shelf-break) www.fishbase.se Muraenolepididae Muraenolepis sp. zooplankton SA-C (shelf-break) Zoarcidae Lycenchelys antarcticus zoobenthos Duhamel et al. (2010) Zoarcidae Lycenchelys aratrirostris zoobenthos SA-B (basins - rare species) Duhamel et al. (2010) Zoarcidae Lycenchelys tristichodon zoobenthos SA-B (basins - rare species) Duhamel et al. (2010) Zoarcidae Lycenchelys xanthoptera zoobenthos SA-C (shelf-break) Duhamel et al. (2010) Zoarcidae Lycodapus pachysoma zooplankton SA-C (shelf-break) Duhamel et al. (2010) Zoarcidae Lycodichthys antarcticus zoobenthos SA-D (banks) Duhamel et al. (2010) Zoarcidae Oidiphorus mcallisteri zoobenthos SA-C (shelf-break) Duhamel et al. (2010) Zoarcidae Ophthalmolycus amberensis zoobenthos SA-A (basins - common species) Duhamel et al. (2010) Zoarcidae Pachycara brachycephalus zoobenthos SA-B (basins - rare species) Duhamel et al. (2010) Zoarcidae Pachycara sp. zoobenthos Duhamel et al. (2010) Appendix S1: Page 7 Table S2 Notes and some relevant references for the signed interaction nodes in the qualitative network diagram. P=positive, N=negative, uncertain or weak links marked in grey. From To sign Notes reference High export ratios for primary production and Surface-derived food near Pelagic food sources P particulate organic carbon in the Southern Henson et al. (2012) seafloor Ocean Surface-derived food near Depth of seafloor N Decomposition of food-particles during sinking seafloor Same volume of water moving over shallow Depth of seafloor Tidal-current speed N areas induces higher tidal-current speeds Slope of seafloor Food-deposition / sedimentation N Particles less likely to settle on sloped surfaces Slope of seafloor Hard substratum P Particles less likely to settle on sloped surfaces Ocean-current speed Suspended food P Ocean-currents resuspend food-particles Jansen et al. (2018b) Ocean-current