Study regions: South West Indian Ocean (A) and French Polynesia (B).

<p>Six geographic sectors were sampled in each region. Each sector was subdivided into bathymetric strata: neritic strata (red; absent in French Polynesia), slope strata (green) and oceanic strata (blue). Sampled transect lines are represented by solid lines inside sectors. For details on the sampling design, see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0105958#pone.0105958-Mannocci1" target="_blank">[11]</a>, <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0105958#pone.0105958-Mannocci2" target="_blank">[12]</a>.