Ecopath with Ecosim: Ecotracerdoga.ogs.trieste.it/doga/echo/ecem07/workshop/03_ECEM07... · 2007....
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Ecopath with Ecosim: Ecotracer Biogeochemical processes and fish dynamics in food web models International Centre for Theoretical Physics Trieste, Nov 26-27, 2007 Villy Christensen UBC Fisheries Centre
Transcript of Ecopath with Ecosim: Ecotracerdoga.ogs.trieste.it/doga/echo/ecem07/workshop/03_ECEM07... · 2007....
Ecopath with Ecosim: Ecotracer
Biogeochemical processes and fish dynamics in food web models
International Centre for Theoretical Physics
Trieste, Nov 26-27, 2007
Villy Christensen
UBC Fisheries Centre
EwE Ecotracer
• Part of the Ecopath with Ecosim (EwE) approach and software system
• Ecotracer is integrated with the three major EwE modules (Ecopath, Ecosim, Ecospace)
• Can use reference data for tuning (in time and space)
Ecopath flow accounting
Consumer 1
Consumer 2
P.Producer Detritus
ImmigrantsInitial conc.
Decay
Environment (time-varying)
Ecotracer adds:
Excretion
Ecotracer input
CB Hg-loading: Tristan Kading
Hg-loading to CB
y = 0.000000461151971x5 - 0.004640244866876x4 + 18.674012460293300x3 - 37,570.355086074100000x2 + 37,788,947.800964300000000x - 15,201,520,023.941900000000000
0
20
40
60
80
100
120
140
160
180
1940 1950 1960 1970 1980 1990 2000 2010 2020
MeHg
Year
Hg (MeHg)data from Chesa-peaketidal waters
x0
0.0
00.0
40.0
8
1998 2002 2006
Alew ife/herring
x0
y0
0.0
00.1
00.2
00.3
0
1990 2000
American eel
x0
y0
0.0
00.1
00.2
00.3
0
1998 2002 2006
Atlantic croaker
x0
y0
0.0
00.0
4
1998 2002 2006
Atlantic Croaker
x0
y0
0.0
00
0.0
10
0.0
20
1998 2002 2006
Black drum
x0
0.0
00.1
00.2
0
1996 2002 2008
Blue crab
x0
y0
0.0
0.2
0.4
1985 1995
Bluefish
x0
y0
0.0
00.0
40.0
8
1980 1984 1988
Bluefish YOY
x0
y0
0.0
0.4
0.8
1.2
1985 1995 2005
Catfish
x0
y0
0.0
00.0
50.1
00.1
5
1998 2002 2006
Gizzard shad
x0
0.0
00
0.0
03
0.0
06
1996 2000 2004
Hard clam
x0
y0
0.0
00.1
00.2
0
1998 2002 2006
Littoral forage fish
x0
y0
0.0
00.0
20.0
40.0
6
1998 2002 2006
Menhaden
x0
y0
0.0
00.0
40.0
8
1998 2002 2006
Non-reef associated f ish
x0
y0
0.0
00.0
60.1
2
1998 2002 2006
Other elasmobranchs
x0
0.0
000
0.0
020
1996 2000 2004
other epi/in fauna
x0
y0
0.0
00
0.0
15
1996 2002 2008
Oyster
x0
y0
0.0
00.0
20.0
4
1998 2002 2006
Reef associated f ish
x0
y0
0.0
00
0.0
03
0.0
06
1996 2000 2004
Soft clam
x0
y0
0.0
00.1
00.2
0
1998 2002 2006
Spot
0.0
0.2
0.4
0.6
0.8 Striped bass
y0
0.0
00.1
00.2
00.3
0
Striped bass resident
y0
0.0
0.1
0.2
0.3
0.4
Summer f lounder
y0
0.0
000
0.0
006
0.0
012
Weakfish
y0
0.0
0.2
0.4 White perch
Ecosim: parallel accounting for persistent pollutants
Ecotracer
Chesapeake Bay: Where’s the MeHg?
0
1
2
3
4
5
6
1950 1960 1970 1980 1990 2000
Other in/epi fauna
Environment
Piscivorous birds
American eel
Littoral forage fish
Spot
Striped bass resident
Non-piscivorous seabirds
Non reef assoc. fish
Bluefish adult
Striped bass migratory
Summer flounder
White perch adult
Catfish
American shad
Atl. croaker
Blue crab adult
MeH
g (a
mo
un
t)
What impacts MeHg level?
Predict MeHg levels for all components
Predict impact of policy measure
R² = 0.466
0.001
0.01
0.1
1
10
100
1 1.5 2 2.5 3 3.5 4 4.5
Me
Hg
Co
nce
ntr
atio
n
Trophic level
R² = 0.189
0.00001
0.0001
0.001
0.01
0.1
1
10
0 1 2 3 4 5 6 7
Me
Hg
Co
nce
ntr
ati
on
Longevity (average, year)
Concentration in space
One application (so far) where Ecotracer has been fitted to spatial reference data
Dioxin-loading: Global model
Predicted Dioxin: Approaching steady state
Dioxin: Observed vs. Predicted
Dioxin: Predicted/Observed
Ecotracer applications
• Watkinson, S. 2001. Life after death: the importance of salmon carcasses to watershed function. M.Sc., Resource Management and Environmental Studies Program, Univ. of British Columbia, Vancouver, B.C.
• Coombs, A.P. 2004. Marine mammals and human health in the Eastern Bering Sea: Using an ecosystem-based food web model to track PCBs M.Sc., RMES, Univ. of British Columbia.
• Booth, S., and Zeller, D. 2005. Mercury, food webs, and marine mammals: implications of diet and climate change for human health. Environmental Health Perspectives 113(5): 521-526.
• Christensen, V., and Booth, S. 2006. Ecosystem modeling of dioxin distribution patterns in the marine environment. In: Alder, J. Pauly, D (eds.) On the multiple uses of forage fish: from ecosystems to markets. Fisheries Centre Research Reports V(n). Fisheries Centre, University of British Columbia [ISSN 1198-6727]
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Ecotracer implementation
• EwE5
– Initial version implemented
• EwE6
– Currently not included
– Expecting to implement in cooperation with Finnish Institute of Marine Science and NOAA Chesapeake Bay by early 2008
– Time series handling added
– Lipophilic handling
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