Steelhead Viability: Where are we now and where are we going?
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Transcript of Steelhead Viability: Where are we now and where are we going?
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Steelhead Viability: Where are we now and where are we going?
Paul McElhany
NOAA Fisherie
Northwest Fisheries Science Center
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Talk Outline
• Recent NOAA Status Review– General Conclusions– Big Issues– Next Steps
• TRT Viability Criteria– Purpose of criteria– General Structure– Preliminary Targets
• TRT Population Evaluations
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Biological Review Team
• Reviewed status of all listed species in 2003
• Relied on available data
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Winter Steelhead Populations in LCR
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Summer Steelhead Populations in LCR
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Population Statistics in BRT Review
0
200
400
600
800
1,000
1,200
1,400
1,600
1988 1990 1992 1994 1996 1998 2000 2002 2004
Year
Ab
un
da
nc
e
Total Spawners Natural Origin Spawners
0
200
400
600
800
1,000
1,200
1,400
1,600
1988 1990 1992 1994 1996 1998 2000 2002 2004
Brood Year
Ab
un
da
nc
e
Pre-Harvest Recruits Spawners
Coweeman
Kalama
Sandy
WindSF Toutle
NF Toutle
Clackamas
Washougal
0.77
0.82
0.87
0.92
0.97
1.02
1.07
0 100 200 300 400 500 600 700 800Recent Mean Natural Origin Spawners
Gro
wth
Ra
te (l
)
Run Population
Years for Trend
Prob. Trend <1
Prob. l < 1
Hatchery = 0
Hatchery = Wild
Winter
Coweeman 1990-2002 0.822 0.851 0.995
South Fork Toutle 1990-2002 0.919 0.797 0.812
North Fork Toutle 1990-2002 0.026 0.135 0.135
Kalama 1990-2002 0.463 0.593 0.846
Clackamas 1990-2001 0.929 0.849 0.929
Sandy 1990-2001 0.999 0.991 1.000
Summer
Kalama 1990-2003 0.991 0.849 1.000
Washougal 1990-2003 0.249 0.349 0.757
Wind 1990-2003 0.659 0.538 0.989
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Big Issue #1: Hatcheries
• Interim Policy: ESU’s must be naturally self sustaining
• Identified relation of hatchery stocks to ESUs
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rela
tion
ship
to n
atur
al p
opul
atio
n
Substantial naturalorigin fish inbroodstock andminimaldivergence
Moderate to fewnatural origin fishin broodstock andno more thanmoderatedivergence *
substantialdivergence **
Source of hatchery stock and status of local population
source fromlocal, nativenaturalpopulation
source non-local butwithin ESU, nativelocal naturalpopulation exists
source non-local butwithin ESU, no nativelocal natural population
source non-local andpredominantly from outside ofESU
1a
2a
3a
2c
3b
1b
2b
3c
4
* moderate divergence = no more than observed between similar populations within ESU** substantial divergence = comparable to divergence observed within entire ESU*** extreme divergence = greater than divergence observed within ESU or substantial artificial selection or manipulation
NA
extreme divergence***
4 4 4 4
Hatchery Stock Categories
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Key Point About Hatcheries->
Hatchery fish may be part of ESU ----
but they do not positively affect the natural self-sustainability of the ESU
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Big Issue #2: Anadromous-Resident Interactions
• ESU Question – three categories– Sympatric = in ESU– Historically Allopatric = out of ESU– Recently Allopatric (i.e. Above Dams) = unknown
• Risk Question– Big Uncertainty– Anadromy essential life-history component for
long-term ESU viability
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Big Issue #3: Recent High Returns
• How do recent high returns affect risk evaluation?
• What happens next time marine survivals decline?
• Long-term predictions in marine survival?
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Next Steps in ESA Listing
• Policy consideration of recovery measures
• Public announcement of proposed listing this month
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Technical Recovery Team Tasks
• Identify populations
• Inform recovery goals (viability criteria)
• Identify limiting factors
• Determine impact of potential recovery actions
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Useful Figure?
Extinct
Current Status
Viable (delisting)
“Broad SenseRecovery”
Historic
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ESA Delisting Criteria
• No longer threatened or endangered
• “Measurable and objective”
• Must relate to listed unit (e.g. ESU)
• Not necessarily the flip side of listing criteria
• Includes biological metrics of fish performance AND evaluation of threats
• Part science– part policy
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Viable Salmonid Populations (VSP)
• Partition ESU into demographically independent populations
• Evaluate viability of individual populations– Abundance– Productivity– Spatial structure– Diversity
• Determine how many and which populations need to be in what status
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How many and which populations?
• Catastrophic Risk
• Metapopulation Processes
• Evolutionary Processes
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WLC-TRTViability Criteria
Framework
ESU Criteria
Strata Criteria
Population Persistence Probability
Population Attributes•Productivity and Abundance
•Diversity
•Habitat
•Spatial Structure
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LCR Steelhead Strata
Summer Winter
Cascade 4 14
Gorge 2 3
Life History
Ecological
Zone
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Within strata- How many and which populations?
• The recovery unit should have a enough populations with sufficiently high viability levels that the unit will persist.
• The populations restored/maintained at viable status should be selected to:– Allow normative metapopulation processes (include
“core” populations). – Allow normative evolutionary processes (include
“genetic legacy” populations) – Minimize susceptibility to catastrophic events.
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Population Persistence Categories
Persistence Category
Description
0Very high extinction risk; extirpated
1 High extinction risk
2 Moderate extinction risk
3Low extinction risk over 100 years; VSP
4 Very low extinction risk
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Strata rule set
• At least two viable populations (>= level 3)
• Average population persistence score >=2.25
Results in viability criteria proportional to historical population numbers
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Current Status
0
1
2
3
4
Cowee
man
Wint
er
Lower
Cow
litz W
inter
S.F. T
outle
Wint
er
N.F. T
outle
Wint
er
Tilton
Wint
er
Upper
Cow
litz W
inter
Cispus
Wint
er
Kalam
a W
inter
N.F. L
ewis
Wint
er
E.F. L
ewis
Wint
er
Salmon
Cre
ek W
inter
Was
houg
al W
inter
Clacka
mas
Wint
er
Sandy
Wint
er
Lower
Gor
ge W
inter
Upper
Gor
ge W
inter
Hood
Wint
er
Kalam
a Sum
mer
N.F. L
ewis
Summ
er
E.F. L
ewis
Summ
er
Was
houg
al Sum
mer
Wind
Sum
mer
Hood
Summ
er
Population
Per
sist
ence
Cat
ego
ry
1.061.21 1.26
1.16
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Example Viable ESU
0
1
2
3
4
Cowee
man
Wint
er
Lower
Cow
litz W
inter
S.F. T
outle
Wint
er
N.F. T
outle
Wint
er
Tilton
Wint
er
Upper
Cow
litz W
inter
Cispus
Wint
er
Kalam
a W
inter
N.F. L
ewis
Wint
er
E.F. L
ewis
Wint
er
Salmon
Cre
ek W
inter
Was
houg
al W
inter
Clacka
mas
Wint
er
Sandy
Wint
er
Lower
Gor
ge W
inter
Upper
Gor
ge W
inter
Hood
Wint
er
Kalam
a Sum
mer
N.F. L
ewis
Summ
er
E.F. L
ewis
Summ
er
Was
houg
al Sum
mer
Wind
Sum
mer
Hood
Summ
er
Population
Per
sist
ence
Cat
ego
ry
2.292.33 2.25
3.00
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North Santiam Steelhead Attribute Persistence Probabilities
05
10152025303540
Very Low Low Moderate High Very High
Persistence Category
Cer
tain
ty P
oint
s
05
10152025303540
Very Low Low Moderate High Very High
Persistence Category
Cer
tain
ty P
oint
s
05
10152025303540
Very Low Low Moderate High Very High
Persistence Category
Cer
tain
ty P
oint
s
0
5
10
15
20
25
30
35
40
Very Low Low Moderate High Very High
Persitence Category
Cer
tain
ty P
oint
s
Abundance and Productivity Diversity
Habitat Spatial Structure
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Conclusions
• BRT recognizes many ESUs still at risk
• Viability criteria in development
• Identifying recovery plan actions…