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Development of a predation index to assesstrophic stability in the Gulf of Alaska
RASMUSON FISHERIES
RESEARCH CENTER
- N. Gulf of Alaska Applied Research Award -
Cheryl Barnes, UAF
Anne Beaudreau, UAF
Martin Dorn, AFSC
Kirstin Holsman, AFSC
Franz Mueter, UAF
newbie
Predation: important source of mortality for marine fishes
• shapes size and age structures
• impacts recruitment and survival
Georges Bank BalsfjordenS. Benguela
North Sea Barents SeaE. Bering Sea
Bax 1991
mortality due to predation by other fish
> larval and early juvenile stages
pred
atio
n an
d tro
phic
stab
ility
in th
e G
ulf o
f AK
pred
atio
n an
d tro
phic
stab
ility
in th
e G
ulf o
f AK
Walleye Pollock (Gadus chalcogrammus)
Gaichas et al. 2015
5%W. Pollock
23%Pacific Halibut
33%Arrowtooth Flounder
16%Pacific Cod
6%Other Fishes 1%
Unexplained
8% Marine Mammals
1% Skates
pred
atio
n an
d tro
phic
stab
ility
in th
e G
ulf o
f AK
Walleye Pollock (Gadus chalcogrammus)
Gaichas et al. 2015
5%W. Pollock
23%Pacific Halibut
33%Arrowtooth Flounder
16%Pacific Cod
6%Other Fishes 1%
Unexplained
1% Skates84% mortality
due to predation by fish
8% Marine Mammals
mortality due to predation by other fishes
pred
atio
n an
d tro
phic
stab
ility
in th
e G
ulf o
f AK
Walleye Pollock (Gadus chalcogrammus)
0
500000
1000000
1500000
2000000
2500000
3000000
1961 1963 1965 1967 1969 1971 1973 1975 1977 1979 1981 1983 1985 1987 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007 2009 2011 2013 2015 20171960 1970 19901980
1
2
3
2000
Gro
und
fish
Biom
ass (
milli
ons o
f ton
s)
Dorn et al. 2017
2010
Walleye PollockGulf of Alaska
pred
atio
n an
d tro
phic
stab
ility
in th
e G
ulf o
f AK
0
500000
1000000
1500000
2000000
2500000
3000000
1961 1963 1965 1967 1969 1971 1973 1975 1977 1979 1981 1983 1985 1987 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007 2009 2011 2013 2015 20171960 1970 19901980
1
2
3
2000
Gro
und
fish
Biom
ass (
milli
ons o
f ton
s)
2010
Walleye PollockArrowtooth FlounderPacific CodPacific HalibutSablefish
Gulf of Alaska
Dorn et al. 2017; Spies et al. 2017; Barbeaux et al. 2017; Stewart and Hicks 2017; Hanselman et al. 2017
pred
atio
n an
d tro
phic
stab
ility
in th
e G
ulf o
f AK
0
500000
1000000
1500000
2000000
2500000
3000000
1961 1963 1965 1967 1969 1971 1973 1975 1977 1979 1981 1983 1985 1987 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007 2009 2011 2013 2015 20171960 1970 19901980
1
2
3
2000
Gro
und
fish
Biom
ass (
milli
ons o
f ton
s)
2010
Walleye PollockArrowtooth FlounderPacific CodPacific HalibutSablefish
Gulf of Alaska
Dorn et al. 2017; Spies et al. 2017; Barbeaux et al. 2017; Stewart and Hicks 2017; Hanselman et al. 2017
pred
atio
n an
d tro
phic
stab
ility
in th
e G
ulf o
f AK
0
500000
1000000
1500000
2000000
2500000
3000000
1961 1963 1965 1967 1969 1971 1973 1975 1977 1979 1981 1983 1985 1987 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007 2009 2011 2013 2015 20171960 1970 19901980
1
2
3
2000
Gro
und
fish
Biom
ass (
milli
ons o
f ton
s)
2010
Walleye PollockArrowtooth FlounderPacific CodPacific HalibutSablefish
Gulf of Alaska
Dorn et al. 2017; Spies et al. 2017; Barbeaux et al. 2017; Stewart and Hicks 2017; Hanselman et al. 2017
pred
atio
n an
d tro
phic
stab
ility
in th
e G
ulf o
f AK
Research Questions1) How does predation intensity change through time and space?
0
500000
1000000
1500000
2000000
2500000
3000000
1961 1963 1965 1967 1969 1971 1973 1975 1977 1979 1981 1983 1985 1987 1989 1991 1993 1995 1997 1999 2001 2003 2005 2007 2009 2011 2013 2015 20171960 1970 19901980
1
2
3
2000
Gro
und
fish
Biom
ass (
milli
ons o
f ton
s)
2010
Walleye PollockArrowtooth FlounderPacific CodPacific HalibutSablefish
Gulf of Alaska
Dorn et al. 2017; Spies et al. 2017; Barbeaux et al. 2017; Stewart and Hicks 2017; Hanselman et al. 2017
pred
atio
n an
d tro
phic
stab
ility
in th
e G
ulf o
f AK
Research Questions1) How does predation intensity change through time and space?
2) How stable is the demersal food web in the Gulf of Alaska?
pollock consumed per year and area (MT) =
pred
atio
n an
d tro
phic
stab
ility
in th
e G
ulf o
f AK
Research Question
1) How does predation intensity vary in time and space?
pollock consumed per year and area (MT) =
pred
atio
n an
d tro
phic
stab
ility
in th
e G
ulf o
f AK
Research Question
1) How does predation intensity vary in time and space?
totalpredator biomass
KG
pollock consumed per year and area (MT) =
pred
atio
n an
d tro
phic
stab
ility
in th
e G
ulf o
f AK
Research Question
1) How does predation intensity vary in time and space?
*relative
predator densitytotal
predator biomass
KG
pollock consumed per year and area (MT) =
pred
atio
n an
d tro
phic
stab
ility
in th
e G
ulf o
f AK
Research Question
1) How does predation intensity vary in time and space?
* *relative
predator densitytotal
predator biomassmean
annual ration
KG
pollock consumed per year and area (MT) =
pred
atio
n an
d tro
phic
stab
ility
in th
e G
ulf o
f AK
Research Question
1) How does predation intensity vary in time and space?
* * *proportions of
pollock consumedrelative
predator densitytotal
predator biomassmean
annual ration
KG
pollock consumed per year and area (MT) =
pred
atio
n an
d tro
phic
stab
ility
in th
e G
ulf o
f AK
Research Question
1) How does predation intensity vary in time and space?
* * * *proportions of
pollock consumedages of pollock
consumedrelative
predator densitytotal
predator biomassmean
annual ration
KG
pollock consumed per year and area (MT) =
Kitchell et al. 1977Hanson et al. 1997Harvey 2009Holsman and Aydin 2015Holsman et al. 2019
* * * *proportions of
pollock consumedages of pollock
consumed
Barbeaux et al. 2017Dorn et al. 2017Hanselman et al. 2017Spies et al. 2017Stewart and Hicks 2017
- Resource Ecology and Ecosystem Modeling ProgramAlaska Fisheries Science Center, NOAA
Livingston et al. 2017
- Resource Assessment and Conservation Engineering Division- Marine Ecology and Stock Assessment Program
Alaska Fisheries Science Center, NOAA
- International Pacific Halibut Commission
relativepredator density
totalpredator biomass
meanannual ration
KG
pred
atio
n an
d tro
phic
stab
ility
in th
e G
ulf o
f AK
Research Question
1) How does predation intensity vary in time and space?
pred
atio
n an
d tro
phic
stab
ility
in th
e G
ulf o
f AK
Research Question
1) How does predation intensity vary in time and space?
pollock consumed per year and area (MT) =
* * * *proportions of
pollock consumedages of pollock
consumedrelative
predator densitytotal
predator biomassmean
annual ration
KG
Pollo
ck C
onsu
mp
tion
(mill
MT)
Arrowtooth FlounderPacific CodPacific HalibutSablefishWalleye Pollock
pred
atio
n an
d tro
phic
stab
ility
in th
e G
ulf o
f AK
74%
6%
16%
4% 1%
Pollo
ck C
onsu
mp
tion
(mill
MT)
Arrowtooth FlounderPacific CodPacific HalibutSablefishWalleye Pollock
pred
atio
n an
d tro
phic
stab
ility
in th
e G
ulf o
f AK
Research Questions1) How does predation intensity change through time and space?
2) How stable is the demersal food web in the Gulf of Alaska?
the portfolio effectpr
edat
ion
and
troph
ic st
abilit
y in
the
Gul
f of A
K
synchrony
diversity ∝ stabilityWits University Coral Reef AllianceMarket Watch
the portfolio effectpr
edat
ion
and
troph
ic st
abilit
y in
the
Gul
f of A
K
Com
mun
ity B
iom
ass
Time
Adapted from Oken et al. 2018
the portfolio effectpr
edat
ion
and
troph
ic st
abilit
y in
the
Gul
f of A
K
Time
Adapted from Oken et al. 2018
Variance
Com
mun
ity B
iom
ass
the portfolio effectpr
edat
ion
and
troph
ic st
abilit
y in
the
Gul
f of A
K
A
BC
Com
mun
ity B
iom
ass
Time
Adapted from Oken et al. 2018
Variance
A
B
C
the portfolio effectpr
edat
ion
and
troph
ic st
abilit
y in
the
Gul
f of A
K
A
BC
community biomass
community biomass
community biomass
Time
Synchronous
Adapted from Oken et al. 2018
Variance
Com
mun
ity B
iom
ass
species biomass
the portfolio effectpr
edat
ion
and
troph
ic st
abilit
y in
the
Gul
f of A
K
A
B
C
A
BC
community biomass
Time
Synchronous
Statistically Independent
Adapted from Oken et al. 2018
Variance
Com
mun
ity B
iom
ass
the portfolio effectpr
edat
ion
and
troph
ic st
abilit
y in
the
Gul
f of A
K
A
B
C
A
BC
Time
Synchronous
Statistically Independent
Adapted from Oken et al. 2018
Variance
A
BC
A
B
Com
mun
ity B
iom
ass
the portfolio effectpr
edat
ion
and
troph
ic st
abilit
y in
the
Gul
f of A
K
CAsynchronous
Time
Adapted from Oken et al. 2018
Variance
A
BC
A
B
Com
mun
ity B
iom
ass
the portfolio effectpr
edat
ion
and
troph
ic st
abilit
y in
the
Gul
f of A
K
C
portfolioeffect
Synchronous
Statistically Independent
Asynchronous
Time
Adapted from Oken et al. 2018
Variance
A
BC
A
B
Com
mun
ity B
iom
ass
the portfolio effectpr
edat
ion
and
troph
ic st
abilit
y in
the
Gul
f of A
K
C
portfolioeffect
Synchronous
Statistically Independent
Asynchronous
LESS STABLE
MORE STABLE
YouTube
pred
atio
n an
d tro
phic
stab
ility
in th
e G
ulf o
f AK
Sports Illustrated
the portfolio effect
pred
atio
n an
d tro
phic
stab
ility
in th
e G
ulf o
f AK
variance in total consumption
sum of predator-specific variancessynchrony =
portfolio effect = 1 - synchrony
Spatial Scales:Time Series: 1990 to 2015
- Basin- Pollock Stock Assessment Area- Subregion- INPFC Statistical Area
Gulf of Alaska
pred
atio
n an
d tro
phic
stab
ility
in th
e G
ulf o
f AK
variance in total consumption
sum of predator-specific variancessynchrony =
portfolio effect = 1 - synchrony
Spatial Scales:Time Series: 1990 to 2015
- Basin- Pollock Stock Assessment Area- Subregion- INPFC Statistical Area
Eastern
Western
Central
pred
atio
n an
d tro
phic
stab
ility
in th
e G
ulf o
f AK
variance in total consumption
sum of predator-specific variancessynchrony =
portfolio effect = 1 - synchrony
Spatial Scales:Time Series: 1990 to 2015
- Basin- Pollock Stock Assessment Area- Subregion- INPFC Statistical Area
1990 to 2015pr
edat
ion
and
troph
ic st
abilit
y in
the
Gul
f of A
K
Gulf of Alaska
1990 to 2015
- 0.42
pred
atio
n an
d tro
phic
stab
ility
in th
e G
ulf o
f AK
1990 to 2003 2005 to 2015
- 0.42
1990 to 2003
1990 to 2015pr
edat
ion
and
troph
ic st
abilit
y in
the
Gul
f of A
K
2005 to 2015
0.13
pred
atio
n an
d tro
phic
stab
ility
in th
e G
ulf o
f AK
1990 to 2015
Western
Central
Eastern
pred
atio
n an
d tro
phic
stab
ility
in th
e G
ulf o
f AK
1990 to 2015
Western
Central
Eastern
pred
atio
n an
d tro
phic
stab
ility
in th
e G
ulf o
f AK
1990 to 2015pr
edat
ion
and
troph
ic st
abilit
y in
the
Gul
f of A
K
1990 to 2003 2005 to 2015
N/A
- 0.30
- 0.34
1990 to 2015
1990 to 2003
- 0.17
N/A
0.31
N/A
- 0.30
- 0.34
pred
atio
n an
d tro
phic
stab
ility
in th
e G
ulf o
f AK
2005 to 2015
1990 to 2015
1990 to 2003 2005 to 2015
N/A
- 0.30
- 0.34
- 0.17
N/A
0.31
- 0.03
0.06
- 0.36
pred
atio
n an
d tro
phic
stab
ility
in th
e G
ulf o
f AK
Key Findingspr
edat
ion
and
troph
ic st
abilit
y in
the
Gul
f of A
K
• intense and highly-variable predation
• Arrowtooth Flounder = dominant predator
• synchronous consumption dynamics− increased through time
• dep. on scale/location
Ecological Inferences• trophic instability in the Gulf of Alaska• spatial heterogeneity: buffer
Adapted from Oken et al. 2016
Potential for Top-Down Control
+
-
Key Findingspr
edat
ion
and
troph
ic st
abilit
y in
the
Gul
f of A
K
• trophic instability in the Gulf of Alaska• spatial heterogeneity: buffer
Ecological Inferences
Adapted from Oken et al. 2016
Potential for Top-Down Control
Con
sum
ptio
n Sy
nchr
ony
+
-
• intense and highly-variable predation
• Arrowtooth Flounder = dominant predator
• synchronous consumption dynamics− increased through time
• dep. on scale/location
Key Findingspr
edat
ion
and
troph
ic st
abilit
y in
the
Gul
f of A
K
• trophic instability in the Gulf of Alaska
• strong top-down control over pollock
- spatial heterogeneity: buffere.g., Thorson et al. 2018
Ecological Inferences
Adapted from Oken et al. 2016
Potential for Top-Down Control
Predator Diversity
Con
sum
ptio
n Sy
nchr
ony
+
-
• intense and highly-variable predation
• Arrowtooth Flounder = dominant predator
• synchronous consumption dynamics− increased through time
• dep. on scale/location
Development of a predation index to assesstrophic stability in the Gulf of Alaska
Applications
Development of a predation index to assesstrophic stability in the Gulf of Alaska
Applications
- temporal variation in portfolio effects
Zador and Yasumiishi 2018
GOA: Ecosystem Status Report
Development of a predation index to assesstrophic stability in the Gulf of Alaska
Applications
GOA: Ecosystem and Socioeconomic Profile (ESP)- appendix to SAFE Report
Martin DornAFSC, NOAA
- modifier for constant natural mortality
- spatially-explicit, time-varying, age-specific estimates of predation
“gross caricatures of complex natural systems” – Nicholas J. Bax 1991
scalespace
time
spatial heterogeneity
“gross caricatures of complex natural systems” – Bax 1991
Committee & Co-AuthorsAnne BeaudreauLorenzo CiannelliMartin DornKirstin HolsmanMary HunsickerFranz MueterTerry QuinnRichard Yamada
UAFCoastal Fisheries Ecology LabJordan Watson
Acknowledgments
Funding:
Data provided by:
RASMUSON FISHERIES
RESEARCH CENTER
N. Gulf of Alaska Applied Research Award (2018, 2019)
AFSC, NOAAKerim AydinSteve BarbeauxDana HanselmanGeoff LangWayne PalssonNancy RobersonMark Zimmerman
IPHCIan StewartThomas Kong
Fish ArtNick Ingram
Cheryl L. BarnesCFOS, University of Alaska Fairbanks
cheryl.barnes@alaska.eduhttps://github.com/cheryl-barnes/
Gulf of Alaska Food Web
Aydin et al. 2007
Aydin et al. 2007
Top down control in the Gulf of Alaska
Arrowtooth Flounder - Spies et al. 2017Walleye Pollock - Dorn et al. 2017Pacific Halibut - Stewart and Hicks 2017 +
Pacific Cod - Barbeaux et al. 2017Sablefish - Hanselman et al. 2017
Gulf of Alaska
pred
atio
n an
d tro
phic
stab
ility
in th
e G
ulf o
f AK
Con
sum
ptio
n of
Wal
leye
Pol
lock
(mill
MT)
Wal
leye
Pol
lock
(mill
MT)
1.511.34
2.76
1.53
3.57
3.05
2.37 2.90
0.74
0.48
0.74
0.45
pred
atio
n an
d tro
phic
stab
ility
in th
e G
ulf o
f AK
1.30[- 0.30]
0.97[0.03]
1.19[- 0.19]
0.95[0.05]
1.31[- 0.31]
1.22[- 0.22]
0.88[0.12]
1.30[- 0.30]
0.64[0.36]
N/A
N/A
N/A
N/A
1990 to 2003 2005 to 2015
1990 to 2015pr
edat
ion
and
troph
ic st
abilit
y in
the
Gul
f of A
K
CtenophoraCnidariaMolluscaTeuthidaOctopodaAnnelidaCrustaceaEuphausiaceaMisc. ShrimpsMisc. CrabsEchinodermataTunicataChondrichthyesTeleosteiClupeiformesSalmoniformesOsmeriformesArgentiniformesMyctophiformesGadiformes
G. chalcogrammusG. macrocephalus
PerciformesTrachiniformesScorpaeniformesPleuronectiformesOffalOther
1+ yr, ≥ 19 cm
529 520 1283 415 951 358 189 383 602 592 728 696
Prop
ortio
n of
Pre
y C
onsu
med
(by
wei
ght)
pred
atio
n an
d tro
phic
stab
ility
in th
e G
ulf o
f AK
0+ yr, ≥ 0 cm
685 799 463 339 598 231 195 534 720 843 871 806
CtenophoraCnidariaMolluscaTeuthidaOctopodaAnnelidaCrustaceaEuphausiaceaMisc. ShrimpsMisc. CrabsEchinodermataTunicataChondrichthyesTeleosteiClupeiformesSalmoniformesOsmeriformesArgentiniformesMyctophiformesGadiformes
G. chalcogrammusG. macrocephalus
PerciformesTrachiniformesScorpaeniformesPleuronectiformesOffalOther
Prop
ortio
n of
Pre
y C
onsu
med
(by
wei
ght)
pred
atio
n an
d tro
phic
stab
ility
in th
e G
ulf o
f AK
336 341 228 104 640 160 98 455 411 410 929 660
8+ yr, ≥ 82 cm
CtenophoraCnidariaMolluscaTeuthidaOctopodaAnnelidaCrustaceaEuphausiaceaMisc. ShrimpsMisc. CrabsEchinodermataTunicataChondrichthyesTeleosteiClupeiformesSalmoniformesOsmeriformesArgentiniformesMyctophiformesGadiformes
G. chalcogrammusG. macrocephalus
PerciformesTrachiniformesScorpaeniformesPleuronectiformesOffalOther
*
Prop
ortio
n of
Pre
y C
onsu
med
(by
wei
ght)
pred
atio
n an
d tro
phic
stab
ility
in th
e G
ulf o
f AK
2+ yr, ≥ 45 cm
194 208 45 44 216 109 94 194 227 193 0 0
CtenophoraCnidariaMolluscaTeuthidaOctopodaAnnelidaCrustaceaEuphausiaceaMisc. ShrimpsMisc. CrabsEchinodermataTunicataChondrichthyesTeleosteiClupeiformesSalmoniformesOsmeriformesArgentiniformesMyctophiformesGadiformes
G. chalcogrammusG. macrocephalus
PerciformesTrachiniformesScorpaeniformesPleuronectiformesOffalOther
Prop
ortio
n of
Pre
y C
onsu
med
(by
wei
ght)
pred
atio
n an
d tro
phic
stab
ility
in th
e G
ulf o
f AK
3+ yr, ≥ 37 cm
CtenophoraCnidariaMolluscaTeuthidaOctopodaAnnelidaCrustaceaEuphausiaceaMisc. ShrimpsMisc. CrabsEchinodermataTunicataChondrichthyesTeleosteiClupeiformesSalmoniformesOsmeriformesArgentiniformesMyctophiformesGadiformes
G. chalcogrammusG. macrocephalus
PerciformesTrachiniformesScorpaeniformesPleuronectiformesOffalOther
599 583 227 246 312 375 148 402 601 569 603 602
Prop
ortio
n of
Pre
y C
onsu
med
(by
wei
ght)
pred
atio
n an
d tro
phic
stab
ility
in th
e G
ulf o
f AK
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