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The Influence of Diel Vertical Migration on Krill Recruitment to Monterey Bay

The Influence of Diel Vertical Migration on Krill Recruitment to Monterey Bay. Sarah Carr Summer Internship Project Monterey Bay Aquarium Research Institute Mentor: Francisco Chavez and Tim Pennington. Background. Using coupled biological-physical model Physical model:

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The Influence of Diel Vertical Migration on Krill Recruitment to Monterey Bay

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  1. The Influence of Diel Vertical Migration on Krill Recruitment to Monterey Bay Sarah Carr Summer Internship Project Monterey Bay Aquarium Research Institute Mentor: Francisco Chavez and Tim Pennington

  2. Background • Using coupled biological-physical model • Physical model: • ROMS circulation model (UCLA) used to generate current velocity fields of Monterey Bay region • Coupled model: • Krill (E. pacifica) modeled as Lagrangian drifters with diel vertical migration (DVM) • Idealized scenarios (passive and idealized DVM) applicable to other organisms

  3. ROMS Setup • Grid: • 1.6 km resolution near Monterey Bay • 5 km resolution regionally • Variable vertical resolution (20 sigma levels) • Driver: Coamps/Quickscat blended wind product • Time: October 1999 - September 2000 • “Offline” Model Runs: ROMS velocity fields recorded 2X daily and averaged

  4. Grids and Sample Model Output 5 km resolution 1.6 km resolution

  5. Experimental Design • Behaviors • Passive • Set DVM • Swimming speed = 50, 100, 200, 300 m/hr (0.01 - 0.08 m/s) • Vertical velocity = Model vertical velocity + Swimming speed • Ontogenetic changes in DVM capacity of E. pacifica

  6. Experimental Design • Release locations: • Horizontal • 10 krill sampling locations in Monterey Bay • Vertical • Passive- Surface, 50, 100, 200, 300 m • All DVM- Surface

  7. Experimental Design • Release times: • Daily at midnight • 3 seasons • Upwelling (March- May) • Oceanic (August-October) • Davidson (November-January) • Duration of tracking: • Idealized Behaviors- 20 days • Krill- ~ 6 mo. Average alongshore current velocity at the M1 mooring. Figure from Chavez et al. 2002.

  8. Results: Model Sensitivity • Starting Location • Starting Time: • Hour • Day • Season • Starting Depth • Behavior Note: The following results are for particles started at these locations on six consecutive days in January and July 2000.

  9. Temperature/Velocity Fields at Start of Simulations

  10. Sensitivity to Start Time: Season

  11. Sensitivity to Behavior

  12. Sensitivity to Initial Depth- July 2000

  13. Suggestions? • Experimental design: • Behavior • Release locations (H,V) • Release time • Duration of tracking • Visualization • Trajectories (2D, 3D) • Particle Density

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