Preface The expedition ARK XIX/3 with the German icebreaking RV ...

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2. Determination of individual oxygen uptake rates of megafaunal organisms (both in situ and in the lab) and estimation of their carbon demand 3. Estimation of megabenthic carbon demand at population level by combining information on abundance and individual oxygen uptake. Methods For the assessment of small-scale distribution extensive video footage and photographs have been taken. These images will be evaluated at home using various image analysis tools. Oxygen uptake rates have been determined in situ with a fibre-optical oxygen sensitive sensor (optode). The actual respirometer consisted of three parts: the optode (1) which is mounted to a logging device (Aanderaa, RCM11) (2), which finally is build into a frame with an attached corer tube (3). The oxygen sensor is reaching into the core and measures when pushed into the sediment with “Victor 6000s” manipulating arm continuously the oxygen consumption in the overlying water of the core. Individual respiration rates of macrobenthic animals have been measured using Winklertitration. Animals have been taken from box corers and traps. Prior to the measurements the animals have been kept in aquaria at in situ temperatures (-0.8 °C). Results and discussion Overall nine in situ measurements have been carried out, lasting from 4 to 105 hours according to availability of “Victor 6000”. Sediment community oxygen consumption (SCOC) has been measured with and without megabenthic epifauna (Tab. C11-1). Figure C11-1 shows the summary of the first deployment of the respirometer. A rough estimate of consumption rates is listed in Tab. C11-2. The numbers are preliminary and have to be recalibrated at a later time. The calculated carbon demand (Tab. C11-2) ranges from 1 to 22 mg C m -2 h -1 . Cores without visible megabenthic epifauna sometimes had higher consumption rates than cores with animals (see experiment M7 and M8). This may be due to high activity in the sediment. Pictures made by “Victor 6000” indicate a high abundance of burying animals, e.g. isopods and polychaetes. - 271 -
Tab C11-1: Stationlist of in situ measurements Station Dive Measurement Latitude (N) Longitude (E) Depth (m) Date and Time 64-412 227 M1 79°03,8' 4°11,4' ? 21/07/03 22:10 64-412 227 22/07/03 10:45 64-412 227 M2 79°03,8' 4°11,4' ? 22/07/03 10:52 64-424 228 24/07/03 18:23 64-424 228 M3 79°04,416' 4°08,064' 2450 24/07/03 21:28 64-424 228 25/07/03 05:58 64-424 228 M4 79°04,416' 4°08,064' 2450 25/07/03 06:02 64-424 228 25/07/03 12:20 64-435 229 M5 79°04,403' 4°08,118' 2437 26/07/03 17:34 Duration (h) Remarks Porifera + Anthozoa 12,58 approx. 1 nm SE of Metal Frame Blind M1 55,52 2 m to the right of M1 Bathycrinus 8,50 close to Metal Frame and cages Blind M3 6,30 1 m to the right of M3 Porifera+Garnele
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Preface The expedition ARK XIX/3 wi
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B. 1 Cruise leg ARK XIX/3b: An intr
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The ARK XIX/3 expedition A. 1 Itine
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positioning and navigation of the "
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was followed to obtain video materi
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On Friday morning the 20 th of June
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Fig. A1-2: The working area of the
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"Polarstern" (actual air temperatur
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6000" was still at depth "Polarster
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aseline navigation antennae which a
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Fig. A1-3: Entire cruise track of R
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At end of the leg pressure rising b
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The temperatures during the cruise
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Most frequent wind direction was so
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A. 3.1 High resolution seabed mappi
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On the other hand, the accuracy of
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The sampling campaign was also unde
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Hydrosweep DS2 is installed onboard
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Fig. A4.2-2: Normalized backscatter
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In addition to the micro bathymetry
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ackscatter value of -37.0dB, -38.9d
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athymetry and angular backscatter d
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A. 4.3 Sedimentary and hydrodynamic
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glacial periods. There is also evid
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Fig. A4.3.2-2: Visualisation of dif
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It seems that all the mounds along
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Visible calcareous fauna removed (b
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Fig. A4.3.3-2 Location of SAMS Phot
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Box Core Sample Log Sheet Station N
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A. 4.3.4 Influence of mound topogra
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A. 4.3.5 Photo lander deployment on
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- UMI data logger controlling a tra
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Fig. A4.3.5-3. Close-up view of the
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Lineated features are present NE of
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CARACOLE Cruise Report 30/07/2001 (
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intermediate nepheloid layers (Dick
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Fig. A4.4.1-2. Location of main stu
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A. 4.4.3 Biogeoprocesses along the
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in the database with the exact posi
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The areas with significant benthic
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predators and strong bottom current
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faunal distribution. Palaentologica
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ocks predate the last glaciation, s
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A. 4.4.6 Biological and geological
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Hovland M, Croker PF, Martin M (199
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Live fauna Sediments Live fauna and
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sites can subsequently be transport
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4) The NSOW has similar water mass
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0 100 200 300 400 500 600 700 800 P
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A. 4.8 Deep water coral ecology and
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and video observations made. On ret
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Fig. A4.8.2-2: This orange, planar
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Fig. A4.8.2-4: Feather-shaped alcyo
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Fig. A4.8.2-7: Top left) Yellow alc
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scour or demersal trawling. The gro
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survey at frequencies of 38, 70, 12
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"Belgica mounds" - Porcupine Seabig
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"Twin mounds" - Porcupine Bank 14°
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corals were alive, relatively abund
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Network Setup for Tests The setup f
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are only initial testings and much
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pressure produced as a consequence
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surrounded by elevated sediment fea
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B. 2 Microbathymetry on ROV "Victor
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Pitch correction Due to assembling
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Maps Complete area Håkon Mosby Mud
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B. 3 Geochemistry, geophysics and s
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Heat Flow HMMV 2m # # # # # # # # #
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Lat_dec. Lon_dec Name k T_0m PS64/s
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Temperature / Gravity Corer # GC9 #
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Table B3.2-1: Technical specificati
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Sound velocity: As the cores all co
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Fig. B3.3-1: Display of a 4 km long
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sediment cores varies between 166 t
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Fig. B3.4-1b: Lithological descript
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Fig. B3.4-1d: Lithological descript
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Fig. B3.4-1f: Lithological descript
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hydrotroilite and gas hydrate, this
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As an example, a echo sounder image
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B. 5 Biological investigations at t
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- How much methane is oxidized aero
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profiler). Bottom water samples hav
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the water column was measured using
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1 kg of tubeworms in wet weight. Th
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B. 5.2 Microscale analysis of the s
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Laboratory measurements Central sit
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O2, CO3-- (mM) Beggiatoa mats, 30/0
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Photograph of the sulfide oxidising
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Central area No measurements could
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the temperature profile showed adve
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B. 5.3 Methane in gas hydrate beari
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The deployments covered 3 (5) diffe
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flows at the Håkon Mosby Mud Volca
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The quality of the mosaics depends
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Page 225 and 226: References Milkov, A., Vogt, P., Ch
Page 227 and 228: ROV "Victor 6000" The ROV "Victor 6
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Page 243 and 244: C. 4 Marine Geology Kukina, N. Majo
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Page 253 and 254: material via the Transpolar Drift t
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Page 261 and 262: C. 6 Debris on the seafloor at “H
Page 263 and 264: Results A summary of the results is
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Page 275 and 276: Tab. C11-2: In-situ measurements of
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Page 283 and 284: - Molecular phylogeny and phylogeog
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Station Date Time PositionLat Posit
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E. Participating institutes / compa
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Acronym Participants iSiTEC GmbH IS
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F. Participants F. 1 Participants A
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F. 2 Participants ARK XIX/3b Armand
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F. 3 Participants ARK XIX/3c Bauerf
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Preface The expedition ARK XIX/3 with the German icebreaking RV ...

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