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Horizontal and vertical distribution of zooplankton biomass in the southern Benguela, May 1983
Verheye, H.M.; Hutchings, L. (1988). Horizontal and vertical distribution of zooplankton biomass in the southern Benguela, May 1983. S. Afr. J. Mar. Sci./S.-Afr. Tydskr. Seewet. 6(1): 255-265. hdl.handle.net/10.2989/025776188784480474
In: South African Journal of Marine Science = Suid-Afrikaanse Tydskrif vir Seewetenskap. Marine & Coastal Management: Cape Town. ISSN 0257-7615, more
Peer reviewed article  

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Keyword
    Marine

Authors  Top 
  • Verheye, H.M.
  • Hutchings, L.

Abstract
    Zooplankton was sampled over four depth ranges with an obliquely towed, multiple, opening-closing RMT-1 × 6 net in May 1983 during an anchovy recruitment survey in the southern Benguela. This sampler allowed animals ranging in size from small copepods (> 200 µm diameter) to large euphausiids (> 3 500 µm diameter) to be collected quantitatively over the whole water column on the continental shelf. The stratification of biomass estimates into different layers is a significant improvement over existing data in the southern Benguela region. The discovery of subsurface peaks in the vertical distribution of zooplankton biomass at night allowed estimation of the zooplankton standing stock with more confidence than previously. The horizontal distributions of zooplankton biomass are, in general, consistent with patterns previously observed in the southern Benguela. Copepods were dominant inshore, whereas larger organisms such as euphausiids, chaetognaths and hyperiid amphipods were dominant farther offshore. The difference in the patterns of vertical distribution between inshore and offshore zooplankters is discussed in relation to predation pressure and population maintenance.

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