Ichthyoplankton density and zooplankton biomass in the northern Benguela upwelling system during D356 September 2010

DOI

Ichthyoplankton density (fish eggs and larvae) and bulk zooplankton biomass in September 2010 were determined for 10 stations in the northern Benguela upwelling system, based on oblique Multinet hauls during the RRS Discovery D356 cruise. A HYDROBIOS Multinet, type Midi (0.25 m2 mouth area) was equipped with five nets of 500 µm-mesh size, temperature and oxygen probes, and an inner and outer flow meter to monitor the net's trajectory (for volume filtered calculations) as well as net clogging. The Multinet was handled over the side, towed horizontally at 2 knots. Winch speed when fearing was 0.5 or 0.3 m/s, heaving velocity 0.2 - 0.3 m/s. The Multinet was towed obliquely at 10 stations sampling the upper 200 m of the water column, which were divided into five different depth strata after inspection of temperature and oxygen concentration depth profiles. Ichthyoplankton densities and zooplankton biomass were calculated for each depth stratum (=single net) from total abundance and the volume of water filtered [individuals per m3 and g wet weight per m3, respectively]. In addition, densities and biomass were integrated over the area for each station [individuals per m2], as sum of calculations for each net: Sum ([individuals per m*3]Delta(depth bot[m]-depth top [m]).

Geocode DEPTH, water is the mid depth of net range. Empty cell describes a missing sample.

Identifier
DOI https://doi.org/10.1594/PANGAEA.843278
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.843278
Provenance
Creator Ekau, Werner; Geist, Simon; Bröhl, Stefanie
Publisher PANGAEA
Publication Year 2015
Funding Reference Bundesministerium für Bildung und Forschung, Bonn https://doi.org/10.13039/501100002347 Crossref Funder ID 03F0650 Geochemistry and ecology of the Namibian upwelling system
Rights Creative Commons Attribution 3.0 Unported; https://creativecommons.org/licenses/by/3.0/
OpenAccess true
Representation
Resource Type Dataset
Format text/tab-separated-values
Size 433 data points
Discipline Biospheric Sciences; Ecology; Geosciences; Natural Sciences
Spatial Coverage (11.093W, -23.018S, 14.006E, -17.300N); Benguela Upwelling
Temporal Coverage Begin 2010-09-13T07:49:00Z
Temporal Coverage End 2010-09-30T06:44:00Z