Densities of sponge fauna on each transect segment.

<p>Letters as for <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0105424#pone-0105424-g003" target="_blank">Fig. 3</a>. Error bars represent standard error. Densities are only shown for taxa which were observed more than once.</p

Crustaceans observed at the deep reef.

<p>A, <i>Bythocaris leucopis</i>; B, small red-and-white shrimp; C, <i>Verum striolatum</i>; D, Lysianassidae sp. 1; E, Lysianassidae sp. 2; F, small white isopod; G, dunce hat shrimp; H, fantail shrimp; I, <i>Saduria megalura</i>; J, <i>Birsteiniamysis inermis</i>; K, <i>Halirages cainae</i>; L, <i>Neohela lamia</i>. Scale bar  = 5 cm.</p

Miscellaneous taxa observed at the deep reef.

<p>A, <i>Lycodes frigidus</i>; B, <i>Mohnia mohnia</i>; C, laminar bryozoan. Scale bar  = 5 cm.</p

Densities of habitat features observed on each transect segment.

<p>Letters as for <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0105424#pone-0105424-g018" target="_blank">Fig. 18</a>. I, percent hard substratum cover.</p

Densities of crustacean fauna on each transect segment.

<p>Letters as for <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0105424#pone-0105424-g005" target="_blank">Fig. 5</a>. Error bars represent standard error. Densities are only shown for taxa which were observed more than once.</p

Physical environment of the deep-water rocky reef.

<p>A, velocity of the bottom current as measured by a long-term lander at station HG-IV; B, bathymetry of the deep reef with location of the photographic transect and predominant bottom current; C, topography of the reef showing transect segments and presumed hydrodynamic patterns over the reef.</p

Densities of cnidarian fauna on each transect segment.

<p>Letters as for <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0105424#pone-0105424-g004" target="_blank">Fig. 4</a>. Error bars represent standard error. Densities are only shown for taxa which were observed more than once.</p

MDS bubble plot depicting megafaunal composition according to percent hard substratum cover.

<p>Data have been fourth-root transformed. A 2-D stress value of 0.11 indicates a good fit of the data.</p

Densities of miscellaneous taxa observed on each transect segment.

<p>Letters as for <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0105424#pone-0105424-g007" target="_blank">Fig. 7</a>. Error bars represent standard error.</p

Sponges observed at the deep reef.

<p>A, <i>Caulophacus arcticus</i>; B, narrow white sponge; C, hairy white sponge; D, <i>Cladorhiza gelida</i>; E, puffy white encrustment; F, <i>Polymastia</i>; G, cup sponge; H, thin white encrustment; I, hole punch sponge; J, dough-like sponge; K, lobe-like sponge; L, half-and-half sponge; M, tennis ball sponge; N, Myxillina sponge; O, bulb-tipped clump; P, pipe sponge; Q, papilla sponge; R, bubble sponge; S, pancake sponge; T, white dome sponge; U, <i>Tentorium semisuberites</i>; V, gray dome sponge; W, volcano sponge; X, slipper sponge; Y, rocket sponge; Z, circle sponge; α, flame sponge. Scale bar  = 20 cm.</p