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Modeling 3D copepod distributions on Georges Bank during 1995 and 1999

Modeling 3D copepod distributions on Georges Bank during 1995 and 1999 Davis, Ji, Beardsley, Chen, Townsend, Flagg, Runge, Durbin. Stock ̶ Recruitment. Number of Recruits. Spawning Stock Biomass. Biomass at Age. GLOBEC Georges Bank Objective:

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Modeling 3D copepod distributions on Georges Bank during 1995 and 1999

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  1. Modeling 3D copepod distributions on Georges Bank during 1995 and 1999 Davis, Ji, Beardsley, Chen, Townsend, Flagg, Runge, Durbin

  2. Stock ̶ Recruitment Number of Recruits Spawning Stock Biomass Biomass at Age GLOBEC Georges Bank Objective: To understand the processes controlling recruitment of cod and haddock and their dominant prey species. Georges Bank Haddock

  3. Georges Bank cod/haddock spawning and larval and juvenile drift (Lough and Manning, 2001) Pratt Haddock larva

  4. The copepods: Centropages Hopcroft Pseudocalanus Calanus Oithona Hopcroft 1 mm Hopcroft Temp & Food Dependent: Fertility Molting Growth Mortality Davis

  5. Results (cont): Broadscale Surveys Broad-scale Phytoplankton vs Salinity Salinity Anomaly Copepods vs Year Cod & Haddock Growth vs Copepods Cod & Haddock Mortality vs Year Cod & Haddock Mortality vs Salinity Anomaly

  6. Greene and Pershing, 2007 Science 1990s Freshening Freshwater in early 1990s traced to Arctic • AO+ winds strengthen Beaufort Gyre • AO- winds release freshwater

  7. Present Work, Synthesis: Models Basin-scale Model Regional-scale Model

  8. S1: Uptake (P on N) S1=μmaxf(I)f(N)f(T)P S2: Grazing (Z on P) S2=gmaxf(P)f(T)Z S3: Loss of P S3=λP S4: Remineral. of D S4=εD S5: Loss of Z S5=mZ2 Eggs Nauplii Copepodids Adults Copepod Population 4-Stage (ENCA) Lower Food Web S5 Z γS5 αS2 S2 βS2 P (1-α-β)S2 S3 S1 N D S4

  9. 100 100 100 Time t Time t+1 0 0 0 4-stage, ENCA A E N C (Hu et al., in press) 0 Time (d) 70 Numerical Diffusion & Mean-Age Model 200 age-stage classes, 13-stages Number of individuals 200 age-stage classes, 13-stages E N C A

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