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Ekau, Werner; Geist, Simon; Bröhl, Stefanie (2015): Ichthyoplankton density and zooplankton biomass in the Benguela upwelling system during AFR258 in December 2009 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.843216

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Abstract:
IIchthyoplankton density (fish eggs and larvae) and bulk zooplankton biomass in December 2009 were determined for 22 stations in the Benguela upwelling system, based on oblique Multinet hauls during the FRS Africana cruise AFR258. A HYDROBIOS Multinet, type Midi (0.25 m**2 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 22 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 m**3 and g wet weight per m**3, respectively]. Densities and biomass were integrated over the area for each station [individuals per m**2], as sum of calculations for each net: Sum ([individuals per m**3]*Delta (depth bot[m]-depth top [m]).
Funding:
Bundesministerium für Bildung und Forschung, Bonn (BMBF), grant/award no. 03F0650: Geochemistry and ecology of the Namibian upwelling system
Coverage:
Median Latitude: -22.632196 * Median Longitude: 13.288104 * South-bound Latitude: -32.300000 * West-bound Longitude: 10.480000 * North-bound Latitude: -17.230000 * East-bound Longitude: 17.983330
Date/Time Start: 2009-12-03T11:00:00 * Date/Time End: 2009-12-15T05:32:00
Minimum DEPTH, water: m * Maximum DEPTH, water: 220 m
Event(s):
AFR258_30244_2 (Fi-1_2) * Latitude: -32.300000 * Longitude: 17.983330 * Date/Time Start: 2009-12-03T11:00:00 * Date/Time End: 2009-12-03T12:30:00 * Elevation: -112.0 m * Location: Benguela Upwelling * Campaign: AFR258 * Basis: Africana (1982) * Method/Device: Multiple opening/closing net, 500 µm meshsize (MSN500)
AFR258_30245_2 (Fi-2_2) * Latitude: -30.298330 * Longitude: 17.108330 * Date/Time Start: 2009-12-04T03:58:00 * Date/Time End: 2009-12-04T04:08:00 * Elevation: -132.0 m * Location: Benguela Upwelling * Campaign: AFR258 * Basis: Africana (1982) * Method/Device: Multiple opening/closing net, 500 µm meshsize (MSN500)
AFR258_30246_3 (Fi-3_3) * Latitude: -30.633330 * Longitude: 16.016660 * Date/Time Start: 2009-12-04T11:34:00 * Date/Time End: 2009-12-04T13:26:00 * Elevation: -212.0 m * Location: Benguela Upwelling * Campaign: AFR258 * Basis: Africana (1982) * Method/Device: Multiple opening/closing net, 500 µm meshsize (MSN500)
Comment:
Geocode DEPTH, water is the mid depth of net range. Empty cell describes a missing sample.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEvent
2Optional event labelEvent 2
3Date/Time of eventDate/Time
4Latitude of eventLatitude
5Longitude of eventLongitude
6Elevation of eventElevationm
7Method/Device of eventMethod/Device
8NumberNoGeist, Simonof net
9Depth, top/minDepth topmGeist, Simonnet opened
10Depth, bottom/maxDepth botmGeist, Simonnet closed
11DEPTH, waterDepth watermGeocode
12VolumeVolm3Geist, SimonCalculatedof net
13Zooplankton, biomass, wet massZoopl biom wmmg/m3Geist, SimonCalculatedoriginal unit is in [g/100 m**3]
14Zooplankton, biomass, wet massZoopl biom wmg/m2Geist, SimonCalculatedper station
15Fish eggsFish eggs#Geist, SimonCalculatedper net
16Fish eggsFish eggs#/m3Geist, SimonCalculatedoriginal unit is in [#/100 m**3]
17Fish eggsFish eggs#/m2Geist, SimonCalculatedoriginal unit is in [#/10 m**2]
18Fish larvaeFish larv#Geist, SimonCalculatedper net
19Fish larvaeFish larv#/m3Geist, SimonCalculatedoriginal unit is in [#/100 m**3]
20Fish larvaeFish larv#/m2Geist, SimonCalculatedoriginal unit is in [#/10 m**2]
Size:
861 data points

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