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

This project explores how diel vertical migration influences E. pacifica krill recruitment in Monterey Bay using a coupled biological-physical model. The research focuses on idealized scenarios to understand the effects on krill populations, aided by ROMS circulation model and Lagrangian drifters.

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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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