mountain et al

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M ortality 95 & 96 -0.10 0.00 0.10 0.20 0.30 0 30 60 90 120 C ohort(yr.d) Mortality(/d) M ortality 98 & 99 -0.05 0.00 0.05 0.10 0.15 0.20 0 30 60 90 120 C ohort(yr.d) Mortality(/d) Mountain et al. Buckley et al. Modeling the change in biomass of cod cohorts Gi = m1*ln(Pro) + m2*PP + C Hold effect of photoperiod constant prior to March 20 Growth Model GAMs Seasonal Trends Interannual Differences

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Seasonal Trends Interannual Differences. Modeling the change in biomass of cod cohorts. Mountain et al. Buckley et al. Growth Model. Gi = m1*ln(Pro) + m2*PP + C Hold effect of photoperiod constant prior to March 20. GAMs. Modeling the change in biomass of cod cohorts. - PowerPoint PPT Presentation

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Page 1: Mountain et al

Mortality 95 & 96

-0.10

0.00

0.10

0.20

0.30

0 30 60 90 120

Cohort (yr. d)

Mor

talit

y (/d

)

Mortality 98 & 99

-0.050.000.05

0.100.150.20

0 30 60 90 120

Cohort (yr. d)

Mor

talit

y (/d

)

Mountain et al.

Buckley et al.

Modeling the change in biomass of cod cohorts

Gi = m1*ln(Pro) + m2*PP + C

Hold effect of photoperiod constant prior to March 20

Growth Model

GAMs

Seasonal Trends

Interannual Differences

Page 2: Mountain et al

Low Mortality with 1999 Growth

0

1

2

3

4

20 40 60 80 100 120 140

Julian day

M/G

-0.05

0.00

0.05

0.10

0.15

0.20

34 ug Cod

M an

d G

(d-1

)MG

M/G

Modeling the change in biomass of cod cohorts

0

10

20

30

40

50

60

70

0 10 20 30 40

Age (d)

Bio

mas

s (g

)

March

February

AprilMay

Biomass

Gi = m1*ln(Pro) + m2*PP + C

Poor (95) or Fast (99)

Mi = m1*cohort + m2*(cohort)3 + C

Low (98+99) or High (95+96)

0

10

20

30

40

0 10 20 30

Age (d)

Biom

ass

(g)

High Mortality with 1995 Growth

April

Page 3: Mountain et al

-0.1

-0.05

0

0.05

0.1

0.15

2 4 6 8 10 12

Temperature (C)

Gro

wth

Rat

e (.

d-1

)

1995

1999

1997

Growth rate of larval cod versus water temperature on Georges Bank

(Buckley et al. 2004 and in press)

Page 4: Mountain et al

Conclusions• Strong seasonal trends in growth and

mortality rates• Large interannual differences• Position in fixed solar cycle explains

more variability in M and G than temperature

• Low mortality and rapid growth are necessary but not sufficient for production of a strong year-class

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