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BUILDING STRONG®PORTLAND DISTRICT 1
Inland Avian Predation
Fish Field Unit
Nathan Zorich
FPOM Avian Update McNary emphasis
September 13, 2012
Charlie Moores
Tim Avery Mike Baird
BUILDING STRONG®PORTLAND DISTRICT 2
Fish eating bird colonies
(Roby, Collis et al. 2011)
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USACE Avian Management
Estuary In-land
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BiOp requirements
Smolt survival 96% Spring & 93% Summer Inland Avian Reasonable & Prudent Alternatives
47. Manage avian predators on Corps lands
48. Continue deterrents at dams
68. Monitor avian predators & smolt impacts
NeedsDeterrent evaluation
Long term monitoring
Prioritize avian deterrent spending
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Long Term Monitoring: Counts
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Focused Monitoring : Fish Consumption
Source: multiple: FFU studies
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Deterrent: Funding Hazing
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Monitoring: Standardization
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Monitoring: Data collectionData entries to On-line Portal
as of 2012-09-11
Lower Granite
Little Goose
Lower Monumental
Ice Harbor
McNary
John Day
The Dalles
Bonneville
Apr May Jun Jul Aug Sep
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Monitoring: Analysis & Reporting
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BUILDING STRONG®PORTLAND DISTRICT 12
Me
an
Da
ily C
ou
nt (
fora
gin
g )
0100200
BonnevilleCaspian Tern
Apr May Jun Jul Aug Sep
Ice HarborCaspian Tern
The DallesCaspian Tern
0100200
Lower MonumentalCaspian Tern
0100200
John DayCaspian Tern
Little GooseCaspian Tern
Apr May Jun Jul Aug Sep
McNaryCaspian Tern
0100200
Lower GraniteCaspian Tern
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Me
an
Da
ily C
ou
nt (
fora
gin
g )
0100200
BonnevilleGull
Apr May Jun Jul Aug Sep
Ice HarborGull
The DallesGull
0100200
Lower MonumentalGull
0100200
John DayGull
Little GooseGull
Apr May Jun Jul Aug Sep
McNaryGull
0100200
Lower GraniteGull
Foraging Gulls 2012
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McNary Dam
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McNary 2012
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McNary 2012
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John Day Gulls 2009
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John Day Gulls 2010
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John Day Dam 2009*
*Daily mean gull count n = 99 One dot = one gull
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John Day Dam 2010*
*Daily mean gull count n = 17 One dot = one gull
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John Day Gulls 2011
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Gull Counts April – July (foraging gulls / day)
*April – 20 May 2010
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JFOF Approximate
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Concerns from Project Biologist Region wants current hazing or more
► Unsustainable under O&M budget forecast► Benefits hazing vs. political reality?
• JD Consumption:
6k (0.02%) of 31 M smolt in 2011
38k (0.27%) of 40 M smolt in 2010(Zorich et al. 2011)
Maintenance cost of extensive line array JD► $6 M to build, 125 synthetic lines 3,000 ft. long► Maintenance will increase as lines age and fail
