PERMANOVA of community composition with the two contours (Inside (I) vs Outside (O)), three water masses (WM) and two regions (R) fixed factors.

Contour compares the interior to the exterior of each canyon. Two definitions of interior were used: all samples taken within the central canyon axis and all samples taken within only the parts of the canyon that are topographically distinct in Fig 2 (central axis ≥200 m for du Couedic Canyon and ≥500 m for Bonney Canyon). Canyon exterior was all samples that were not defined as interior. The three water masses are the South Australian current at 100–200 m, Flinders current at 500 m and Antarctic Intermediate Water at 1000–1500 m. The two regions are du Couedic and Bonney. Significant differences are indicated by
* (p<0.05) or
** (p<0.01).
PERMANOVA of community composition with the two contours (Inside (I) vs Outside (O)), three water masses (WM) and two regions (R) fixed factors.