Hirche, Hans-Juergen; Laudien, Jürgen; Buchholz, Friedrich (2015): Near-bottom zooplankton aggregations in Kongsfjorden with link to images from the optical zooplankton sensor MOKI [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.840353, Supplement to: Hirche, H-J et al. (2015): Near-bottom zooplankton aggregations in Kongsfjorden: implications for pelago-benthic coupling. Polar Biology, https://doi.org/10.1007/s00300-015-1799-4
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Abstract:
Near-bottom zooplankton communities have rarely been studied despite numerous reports of high zooplankton concentrations, probably due to methodological constraints. In Kongsfjorden, Svalbard, the near-bottom layer was studied for the first time by combining daytime deployments of a remotely operated vehicle (ROV), the optical zooplankton sensor moored on-sight key species investigation (MOKI), and Tucker trawl sampling. ROV data from the fjord entrance and the inner fjord showed high near-bottom abundances of euphausiids with a mean concentration of 17.3 ± 3.5 n/100 m**3. With the MOKI system, we observed varying numbers of euphausiids, amphipods, chaetognaths, and copepods on the seafloor at six stations. Light-induced zooplankton swarms reached densities in the order of 90,000 (euphausiids), 120,000 (amphipods), and 470,000 ind/m**3 (chaetognaths), whereas older copepodids of Calanus hyperboreus and C. glacialis did not respond to light. They were abundant at the seafloor and 5 m above and showed maximum abundance of 65,000 ind/m**3. Tucker trawl data provided an overview of the seasonal vertical distribution of euphausiids. The most abundant species Thysanoessa inermis reached near-bottom concentrations of 270 ind/m**3. Regional distribution was neither related to depth nor to location in the fjord. The taxa observed were all part of the pelagic community. Our observations suggest the presence of near-bottom macrozooplankton also in other regions and challenge the current view of bentho-pelagic coupling. Neglecting this community may cause severe underestimates of the stock of elagic zooplankton, especially predatory species, which link secondary production with higher trophic levels.
Related to:
Laudien, Jürgen (2014): Sea-bottom video in QuickTime format at ROV station Kongsfjordneset in 2009 [dataset]. Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, PANGAEA, https://doi.org/10.1594/PANGAEA.834613
Laudien, Jürgen; Fleury, Dominique (2015): Sea-bottom video in QuickTime format at a ROV station close to Blomstrand Halvoya in 2014 [dataset]. Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, PANGAEA, https://doi.org/10.1594/PANGAEA.848674
Project(s):
Bentho-Pelagic Processes @ AWI (AWI_BPP)
Coverage:
Median Latitude: 78.946018 * Median Longitude: 12.087877 * South-bound Latitude: 78.910250 * West-bound Longitude: 11.499950 * North-bound Latitude: 78.979920 * East-bound Longitude: 12.322120
Date/Time Start: 2012-09-05T14:01:00 * Date/Time End: 2012-09-08T15:13:00
Minimum DEPTH, water: 45 m * Maximum DEPTH, water: 270 m
Event(s):
M1_NearBlomstrand (M1) * Latitude: 78.966670 * Longitude: 12.266670 * Date/Time Start: 2012-09-05T16:15:00 * Date/Time End: 2012-09-05T18:15:00 * Location: Kongsfjorden, Spitsbergen, Arctic * Method/Device: Moored onsight keyspecies investigation (MOKI) * Comment: Platform: Sabrina
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Optional event label | Event 2 | ||||
| 2 | DATE/TIME | Date/Time | Geocode | |||
| 3 | Latitude of event | Latitude | ||||
| 4 | Longitude of event | Longitude | ||||
| 5 | DEPTH, water | Depth water | m | Geocode | ||
| 6 | File name | File name | Laudien, Jürgen | |||
| 7 | Uniform resource locator/link to image | URL image | Laudien, Jürgen | Moored onsight keyspecies investigation (MOKI) | BMP format, all images in zip archive | |
| 8 | File size | File size | kByte | Laudien, Jürgen | of archive |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
666 data points