ASSEMBLAGES OF ATTACHED (ENCRUSTING) FORAMINIFERA ACROSS A SMALL, CARBONATE PLATFORM, SAN SALVADOR, BAHAMAS
Field work took place at San Salvador, Bahamas, primarily in June 2008 and May 2009. SCUBA was used to collect clasts along shore-to-shelf-edge transects through Telephone Pole Reef in Fernandez Bay and at Rocky Point; through the channel at Cut Cay (North Point); and at numerous spot localities, including two bank-barrier reefs. Clasts were examined in 10-cm2 quadrats: attached specimens were counted and their taphonomic conditions were recorded.
Zonation results primarily from differences in relative abundance of the same taxa in different zones and from differences in average taphonomic states. Near-shore, subtidal assemblages on the west (lee) and north sides of the island are highly abundant, nearly pristine, and dominated by Homotrema and/or Miniacina; on the windward side, Homotrema/Miniacina is less common. Midshelf assemblages vary with locality, although all have fewer Homotrema/Miniacina and more Planorbulina than the near-shore assemblages. Cobbles collected in areas of high sedimentation rates and low reef growth have assemblages that are nearly barren with respect to attached foraminifera. Bank-barrier reef assemblages are similar to those near the shore but show more diversity and a greater abundance of Gypsina plana. Shelf margin assemblages are the most distinct because they are dominated by the large, sheet-like Gypsina plana, with other taxa being sparse and poorly preserved.