survival of steelhead smolts through puget sound in...
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![Page 1: Survival of steelhead smolts through Puget Sound in ...southsoundscience.org/wp-content/uploads/2018/12/6.-Moore.pdf · 12/6/2018 · Megan Moore, Barry Berejikian, Steve Jeffries1](https://reader034.vdocuments.site/reader034/viewer/2022050605/5fac78010e4e426ac65bed00/html5/thumbnails/1.jpg)
Megan Moore, Barry Berejikian, Steve Jeffries1
Northwest Fisheries Science Center
1/ Washington Department of Fish and Wildlife
Funding sources: Washington Department of Fish and Wildlife, Nisqually Indian Tribe, NOAA Northwest Fisheries Science Center
Survival of steelhead smolts through Puget Sound in relation to shifting
predator-prey relationships
Photo: John McMillan
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Tag
Quantifying steelhead smolt survival
Hydrophone deploymentN = 40 (2014-2019)
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Data from Moore et al. 2015. Mar. Ecol. Prog. Ser. 3
0.000.050.100.150.200.250.300.350.400.45
2006
2007
2008
2009
Estim
ated s
urviv
al thr
ough
Pug
et So
und
Migration year
Nisqually (PS) Green (PS)Skagit (PS) Skokomish (HC)Big Beef (HC) Average
Low and decreasing steelhead smolt survival in Puget Sound (2-week migration)
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4
Seals as mobile ‘receivers’
12 Packs deployed• Vemco VMT Tag-hydrophone• GPS/archival tag• Vhf transmitter
Orchard Rocks2014-6 packs
Colvos Rocks2014- 6 packs
2014
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• Stationary steelhead tags detected by seals at haulouts in Puget Sound
• Tag detection patterns consistent with harbor seal movements in Puget Sound (Welch et al. 2007; Berejikian et al. 2016) and estuaries (N = 12)
2014 - Evidence of predation in Puget Sound
-1.00.01.02.03.04.0
Berejikian et al. 2016. Mar. Ecol. Prog. Ser.
• Higher proportions of stationary tags and total seal-detected tags in Central Puget Sound where mortality was greatest
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6
2016
5(5)
3(3)
4(3)
4(4)
200 smolts
• Similar approach 2014• 16 seals• Include South Puget Sound
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10/17/2018 7
7
2016 – Substantial increase in steelhead survival20
06
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017riv
er m
outh
to J
DF
surv
ival
est
imat
e (%
)
0
10
20
30
40
50
Nisqually River steelhead smolt survival
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8
55%Survival rate
34%Survival rate
2014 2016
70%Survival rate
83%Survival rate
69%Survival rate
71%Survival rate
Little evidence of seal predation in high survival year
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Recent shifts in PS and HC steelhead early marine survival
0.000.050.100.150.200.250.300.350.400.45
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
Estim
ated s
urviv
al to
JDF
Migration year
Nisqually (PS) Green (PS) Skagit (PS)Skokomish (HC) Big Beef (HC) Average
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What has caused the shift in steelhead smolt survival and apparent predation?
U.S. Department of Commerce | National Oceanic and Atmospheric Administration | NOAA Fisheries | Page 10
- Change in steelhead smolt behavior
- Change in predator behavior/predation pressure
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Travel time
Days from release
0 2 4 6 8 10 12 14
Kilo
me
ters
fro
m J
DF
0
50
100
150
200
250
Nisqually 2016Nisqually 2015Nisqually 2014
Rkm 19River MouthNAR
CPS
ADM
JDF
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Top-down effects?
05
101520253035
Jan-
06Se
p-06
May-0
7Ja
n-08
Sep-
08Ma
y-09
Jan-
10Se
p-10
May-1
1Ja
n-12
Sep-
12Ma
y-13
Jan-
14Se
p-14
May-1
5Ja
n-16
Sep-
16Numb
er of
days
with
at le
ast 1
sig
hting
Whale Museum Data - transient sightings 2006 -2016Area 9
Area 13
Area 11
Area 10
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Duguid et al. (2018) Deep Sea Research Part II, https://doi.org/10.1016/j.dsr2.2018.05.018
0.000
0.100
0.200
0.300
0.400
0.500
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
Survi
val (p
ropo
rtion)
Nisqually steelhead early marine survival
Alternative prey hypothesisStrait of Georgia zooplankton
survey
Strait of Georgia Age-0 herring survey
Fraser River plume study
S. Strait of Georgia tow net
Skagit Bay tow net
Whidbey Basin town net
Central Puget Sound tow net
South Puget Sound tow net
Snohomish beach seine
Elwha beach seine
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14
F=5.91, p = 0.051R2 = 0.496
F=11.97, p = 0.013R2 = 0.666
Close relationship between anchovy abundance and steelhead mortality rate
Anchovy data from Correigh Greene – Skagit Bay tow net survey
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15Duguid et al. (2018) Deep Sea Research Part II,
https://doi.org/10.1016/j.dsr2.2018.05.018
Anchovy abundance regulated by temperature
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Summary1. Significant changes in early marine survival 2. Evidence for predation by harbor seals in
Puget Sound inversely related to marine survival rates
3. Smolt behavior similar among years4. Variation in survival appears to be associated
with increased transient killer whale activity and anchovy pulses
Photo:Steve Jeffries
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Acknowledgements
Salish Sea Marine Survival Project Steelhead WorkgoupMatt KlungleEric WardKaty DoctorJeff AtkinsJed MooreTom FriedrichWalker DuvallDennis Lucia + Hickson crewDevin WestChris FrazierLars Swartling
Iris KempDyanna LambournJosh OliverBrian MurphyAusten ThomasJames HackettSayre HodgsonChris EllingsRob EndicottMichael SchmidtErik Neatherlin
Many others!