Not logged in
PANGAEA.
Data Publisher for Earth & Environmental Science

Hirche, Hans-Jürgen; Laudien, Jürgen; Buchholz, Friedrich (2015): Near-bottom zooplankton aggregations in Kongsfjorden with link to images from the optical zooplankton sensor MOKI. 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

Always quote above citation when using data! You can download the citation in several formats below.

RIS CitationBibTeX CitationShow MapGoogle Earth

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. 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. Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, PANGAEA, https://doi.org/10.1594/PANGAEA.848674
Project(s):
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 * Device: Moored onsight keyspecies investigation (MOKI) * Comment: Platform: Sabrina
M2_NearKongsbreen (M2) * Latitude: 78.910250 * Longitude: 12.186770 * Date/Time Start: 2012-09-07T19:15:00 * Date/Time End: 2012-09-07T19:35:00 * Location: Kongsfjorden, Spitsbergen, Arctic * Device: Moored onsight keyspecies investigation (MOKI) * Comment: Platform: Sabrina
M3_Kongsfjordneset (M3) * Latitude: 78.979920 * Longitude: 11.499950 * Date/Time Start: 2012-09-08T12:29:00 * Date/Time End: 2012-09-08T12:50:00 * Location: Kongsfjorden, Spitsbergen, Arctic * Device: Moored onsight keyspecies investigation (MOKI) * Comment: Platform: Teisten
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Optional event labelEvent 2
2DATE/TIMEDate/TimeGeocode
3Latitude of eventLatitude
4Longitude of eventLongitude
5DEPTH, waterDepth watermGeocode
6File nameFile nameLaudien, Jürgen
7Uniform resource locator/link to imageURL imageLaudien, JürgenMoored onsight keyspecies investigation (MOKI)BMP format, all images in zip archive
8File sizeFile sizekByteLaudien, Jürgenof archive
Size:
666 data points

Download Data

Download dataset as tab-delimited text (use the following character encoding: )

View dataset as HTML