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EURO-BASIN WP2 Mesocosm 2012: Status Report

EURO-BASIN WP2 Mesocosm 2012: Status Report. Basic Info. Goal: To explore how different phytoplankton populations and the presence or absence of macrozooplankton affect primary production, remineralization, aggregation, sinking fluxes, and the flow of material through the food web

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EURO-BASIN WP2 Mesocosm 2012: Status Report

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  1. EURO-BASIN WP2 Mesocosm 2012:Status Report

  2. Basic Info • Goal: To explore how different phytoplankton populations and the presence or absence of macrozooplankton affect primary production, remineralization, aggregation, sinking fluxes, and the flow of material through the food web • Experiment: A 3.5 week experiment with 18 mesocosms (+6 for a side experiment) • Facility:NTNU (Norwegian University of Science and Technology) Sletvik field station, Bay of Hopavågen (a HYDRALAB IV facility) • Access: 15-17 people, 36 days (mid July to late Aug 2012) • more people possible if funds for travel & accommodation are paid

  3. Sletvik field station, Bay of Hopavågen • Hopavågen is a semi-enclosed lagoon, 120 km west of Trondheim and 20 km west of the outlet of the Trondheimsfjord. • It is sheltered from wind and waves, has an area of 27 ha, a volume of 5,5 million m3, and a depth that varies between 22 m and 32 m. • Due to tidal forcing, about 14% of its water is exchanged per day, through a narrow inlet.

  4. Sletvik Field Station, Hopavågen Trondheim Bergen

  5. Sletvik field station, Bay of Hopavågen

  6. Sletvik field station, Bay of Hopavågen • The Sletvik field station is located 300 m from the lagoon and has a laboratory space of 250 m2, kitchen facilities, nearby catering possibilities, and dormitories for 50 people. • It has also a pier and a small laboratory at the shore of Hopavågen. • Hopavågen is ideal for testing instrumentation as well as testing and validating ecological models.

  7. Sletvik field station, Bay of Hopavågen they are no stranger to mesocosm experiments

  8. Sletvik field station, Bay of Hopavågen Access is funded through the HYDRALAB IV European transnational facilities project (i.e., they provide the travel costs, room & board, and access to the field site for 15-17 people) BASIN (WP2 funds to CDLR) pays for core measurements, sampling equipment, & consumables related to core measurements Side experiments supported through external funding (e.g., NERC, CNRS)

  9. Participants Local participants: Olav Vadstein, Yngvar Olsen, Øystein Leiknes

  10. Provisional Timeline • Day 1-7 Setup (small group); others trickle in • Day 8-20 Begin; add Si, N, P daily • Day 21-30 No addition of nutrients • Day 31-36 Finish experiment, wrap up onsite analyses, pack up, leave

  11. Matrix of Mesocosms unfiltered SW macrozoops removed unfiltered SW copepods added back diatoms dinos coccos mineral addition

  12. Vertical Sampling Plan 0 m 3 m 10 m 6 m 9 m

  13. Temporal Sampling Plan • 7-11 sampling dates within the ~22 days of the experiment (i.e., every 2nd or every 3rd day) • This would yield 500-800 water column samples for each core measurement… and 3x that if done in triplicate • strategies to reduce this number for labor intensive or expensive measurements need to be discussed

  14. Core Measurements

  15. Additional Measurements

  16. Proposed Side Experiments

  17. Tasks for the Next Few Months • receive exact dates for experiment • finalize participant, measurement, and side experiment lists • finalize sampling plan • submit data management plan to HYDRALAB • begin purchasing consumables and sampling equipment

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