Ekau, Werner; Geist, Simon; Bröhl, Stefanie (2015): Ichthyoplankton density and zooplankton biomass in the northern Benguela upwelling system during D356 September 2010 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.843278
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Abstract:
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 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 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 m**3 and g wet weight per m**3, respectively]. In addition, 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]).
Project(s):
Funding:
Bundesministerium für Bildung und Forschung, Bonn (BMBF), grant/award no. 03F0650: Geochemistry and ecology of the Namibian upwelling system
Coverage:
Median Latitude: -20.005842 * Median Longitude: 12.322789 * South-bound Latitude: -23.018000 * West-bound Longitude: 11.093000 * North-bound Latitude: -17.300000 * East-bound Longitude: 14.006000
Date/Time Start: 2010-09-13T07:49:00 * Date/Time End: 2010-09-30T06:44:00
Minimum DEPTH, water: 10 m * Maximum DEPTH, water: 180 m
Event(s):
D356-6_6 * Latitude Start: -17.345000 * Longitude Start: 11.483000 * Latitude End: -17.336000 * Longitude End: 11.495000 * Date/Time Start: 2010-09-13T07:49:00 * Date/Time End: 2010-09-13T08:06:00 * Elevation: -159.0 m * Location: Benguela Upwelling * Campaign: D356 * Basis: Discovery (1962) * Method/Device: Multiple opening/closing net, 500 µm meshsize (MSN500)
D356-7 * Latitude: -17.300000 * Longitude: 11.670000 * Date/Time: 2010-09-13T14:57:00 * Elevation: -66.0 m * Location: Benguela Upwelling * Campaign: D356 * Basis: Discovery (1962) * Method/Device: Multiple opening/closing net, 500 µm meshsize (MSN500)
D356-15_1 * Latitude Start: -22.950000 * Longitude Start: 13.065000 * Latitude End: -22.970000 * Longitude End: 13.061000 * Date/Time Start: 2010-09-19T20:15:00 * Date/Time End: 2010-09-19T20:39:00 * Elevation: -323.0 m * Location: Benguela Upwelling * Campaign: D356 * Basis: Discovery (1962) * 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):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Optional event label | Event 2 | ||||
| 3 | Date/Time of event | Date/Time | ||||
| 4 | Latitude of event | Latitude | ||||
| 5 | Longitude of event | Longitude | ||||
| 6 | Elevation of event | Elevation | m | |||
| 7 | Method/Device of event | Method/Device | ||||
| 8 | Number | No | Geist, Simon | of net | ||
| 9 | Depth, top/min | Depth top | m | Geist, Simon | net opening | |
| 10 | Depth, bottom/max | Depth bot | m | Geist, Simon | net closed | |
| 11 | DEPTH, water | Depth water | m | Geocode | ||
| 12 | Volume | Vol | m3 | Geist, Simon | Calculated | of net |
| 13 | Zooplankton, biomass, wet mass | Zoopl biom wm | mg/m3 | Geist, Simon | Calculated | original unit is in [g/100 m**3] |
| 14 | Zooplankton, biomass, wet mass | Zoopl biom wm | g/m2 | Geist, Simon | Calculated | per station |
| 15 | Fish eggs | Fish eggs | # | Geist, Simon | Calculated | per net |
| 16 | Fish eggs | Fish eggs | #/m3 | Geist, Simon | Calculated | original unit is in [#/100 m**3] |
| 17 | Fish eggs | Fish eggs | #/m2 | Geist, Simon | Calculated | original unit is in [#/10 m**2] |
| 18 | Fish larvae | Fish larv | # | Geist, Simon | Calculated | per net |
| 19 | Fish larvae | Fish larv | #/m3 | Geist, Simon | Calculated | original unit is in [#/100 m**3] |
| 20 | Fish larvae | Fish larv | #/m2 | Geist, Simon | Calculated | original unit is in [#/10 m**2] |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
433 data points