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SEAPODYM & APECOSM

SEAPODYM & APECOSM. Almost everything. ‘ed from P. Lehodey & O. Maury. Bottom-up & Top-down Forcing. global fishery data . fishing effort (catchability & selectivity). “Tuna Forage”. Tunas. global coupled physical-biogeochemical models . temp, currents, oxygen, primary production, etc.

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SEAPODYM & APECOSM

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  1. SEAPODYM & APECOSM Almost everything ‘ed from P. Lehodey & O. Maury

  2. Bottom-up & Top-down Forcing global fishery data fishing effort (catchability & selectivity) “Tuna Forage” Tunas global coupled physical-biogeochemical models temp, currents, oxygen, primary production, etc. A S

  3. z “Tuna Forage” 1 SEAPODYM APECOSM 6 groups in 3 layers 3 groups in multiple layers horizontal movement via advection (currents) and diffusion (randomness)

  4. “Tuna Forage” 2 SEAPODYM APECOSM delay-differential dynamics with a phenomenological basis size-spectrum dynamics with a bioenergetics basis

  5. A Challenge • validating predictions about tuna forage 165E predicted biomass in epipelagic layer vs. ADCP 170W how much of this stuff do tunas really eat? 140W

  6. Tuna Dynamics 1 SEAPODYM APECOSM • size-specific advection and diffusion • advection based on an IBM • decisions to maximize egg production when energy content below some threshold • decisions to maximize larval survival otherwise • vertical behavior described from archival-tag data size-specific advection (towards good “adult habitat” but modified by currents) and diffusion (decreases in good habitat) depth frequency

  7. age-structured dynamics with fixed size-at-age recruitment proportional to quality of “spawning habitat” temperature primary production predation dynamics based on bioenergetics Tuna Dynamics 2 SEAPODYM APECOSM

  8. “Easier” Validation

  9. Extensions – SEAPODYM IPCC Forcing of Mid-trophics Sardine Spawning Habitat

  10. Summary • similar inputs • lots of different stuff in the middle • similar outputs • CLIOTOP • unclear how will be used for advising management (international)

  11. multiple peer-reviewed publications can run on a notebook computer adjoint code for parameter estimation www.seapodym.org first publication in review (possibly in press by now) needs a cluster or highly parallelized code no formal estimation procedure Practicalities SEAPODYM APECOSM

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