Horizontal Trends in Larval Fish Diversity and Abundance Along an OceanEstuarine Gradient on the Northern KwaZulu-Natal Coast, South Africa

Two serpulid species build reefs in the Lagoon of Orbetello, a poly-hyperhaline coastal pond:Hydroides dianthus (Verrill) and Ficopomatus enigmaticus (Fauvel). The latter species reached higher densities and built the most conspicuous reefs, notwithstanding that the former species had tubes with better biomechanical properties (size, thickness, bulk density and porosity).