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The procedures for deploying, recovering, and subsampling sediment cores using a multicorer during marine research. It covers recording essential data, measuring sediment length, examining sediment and water surfaces, making core diagrams, and subsampling for various marine biology courses such as mars 452/512, biol 451w/mars 511, and mars 510.
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1) Record the date, station number, latitude, longitude, bottom depth, time of deployment and time of recovery on the data sheet. 2) Carefully measure the length of sediment recovered for each core and enter this information on the data sheet. 3) Examine the sediment surface and overlying water in each core. Describe any macrofauna, mounds, tracks, trails, detritus, etc. and write the descriptions on the data sheet. 4) Examine each of the cores. Make a diagram of the core indicating any layering, color changes, textural changes, organisms, burrows, or other features observed. Be sure to note the depth (from the top of the core) of each feature. 5) Subsample each of the cores according to the protocols established for each course. MULTICORER SUBSAMPLING I. Bottom water samples for MARS 452/ a) For two cores per station, siphon off the water just above the sediment/water interface into a 250 ml Nalgene bottle. b) Fill in leg number, station number, Niskin bottle number, water depth. c) Place all MARS 452/512 water bottles in chest freezer. II. Sectioned cores for BIOL 451W/MARS 511 a) Using a handheld meter, measure the temperature, salinity and dissolved oxygen concentration of the water just above the sediment in each core. b) Siphon off the liquid just above the sediment/water interface. c) Extrude and slice core sections over the following intervals:
III. Sectioned cores for MARS 450/ a) Choose two cores from opposite sides of the multicorer and a third core adjacent to one of the first two. b) For each of the three cores, siphon off the liquid just above the sediment/water interface. Transfer the liquid into a labeled 250 ml Nalgene bottle for preservation. c) FOR THE TWO OPPOSITE CORES: