Marine Biology

, Volume 156, Issue 9, pp 1949–1961 | Cite as

Macrozoobenthos diversity in an oxygen minimum zone off northern Namibia

  • Michael Lothar Zettler
  • Ralf Bochert
  • Falk Pollehne
Original Paper

Abstract

A benthological survey in the Benguela upwelling area off northern Namibia (located at 17.3°S and water depth ranging between 26 and 117 m) showed the concentration of dissolved oxygen and the accumulation of organic-rich sediments to control macrozoobenthic community patterns. In contrast to highly biodiverse nearshore areas with well-structured shell deposits of the brachiopod Discinisca tenuis (Sowerby 1847), the benthic community in the oxygen minimum zone (OMZ) decreased strongly in species numbers. Nevertheless, a well-established community ranging from 13 to 31 species persisted. Species densities (300–3,350 ind m−2) and biomass (4–109 g afdw/m2) were surprisingly high for areas with near bottom oxygen concentrations from 0.06 to 0.88 ml l−1. In contrast to OMZ’s of other upwelling areas, where the benthic macrofauna is generally dominated by small-bodied polychaetes, off Namibia larger key organisms like the bivalve Nuculana bicuspidata (Gould 1845) and the snail Nassarius vinctus (Marrett 1877) accounted for a large proportion of the macrozoobenthos >1 mm. This is supposed to have a distinct effect on the functional properties of the sediments.

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Michael Lothar Zettler
    • 1
  • Ralf Bochert
    • 1
  • Falk Pollehne
    • 1
  1. 1.Department of BiologyLeibniz Institute for Baltic Sea Research (IOW)WarnemuendeGermany

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