Table 2.

Mean size and epifaunal species diversity for drop stones 200–1000 cm2 in plan area at depths >950 m (N. yaldwyni and crab traces abundant) and <850 m (N. yaldwyni and crab traces absent) in Palmer Deep. ‘Clean’ drop stones had no identifiable epifauna. s.e., standard error.

depth zone (m)no. of stonesmean stone plan area (cm−2)s.e.total no. of species in zonemean species density (per 500 cm−2)s.e.proportion of clean drop stones
> 950 (950–1419)334783580.4880.1420.64
<850 (600–850)1749340142.090.5050.18