stress relief: prescriptions for a healthier delta ecosystem
DESCRIPTION
Stress Relief: Prescriptions for a Healthier Delta Ecosystem. Supported by the S . D . Bechtel, Jr. Foundation. An interdisciplinary study team. Most Californians use Delta resources. Study focused on improving conditions for native fish. How did we get here? Causes of declines - PowerPoint PPT PresentationTRANSCRIPT
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Stress Relief:Prescriptions for a
Healthier Delta Ecosystem
Supported by the S. D. Bechtel, Jr. Foundation
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An interdisciplinary study teamEllen HanakPPICEconomics
Josué Medellín-AzuaraUC DavisEconomics
Jay LundUC DavisEngineering
Jeffrey MountUC DavisGeology
John DurandUC DavisEcology
Peter MoyleUC DavisBiology
William FleenorUC DavisEngineering
Caitrin ChappellePPICPublic policy
Brian GrayUC HastingsLaw
Buzz ThompsonStanford UniversityLaw
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Most Californians use Delta resources
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Study focused on improving conditions for native fish How did we get here?
– Causes of declines Where might we go?
– A realistic vision How might we get there?
– Promising actions, institutional solutions Methods:
– Scientific, economic, and legal analysis– Small workshops – Surveys of scientists (122), stakeholders
(240)
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Outline Causes of stress A realistic vision Promising actions Prescriptions
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Five broad categories of ecosystem stressors ― all related to human actions
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Discharges
Invasive species Physical habitat loss and alteration
Direct fish management
Flow regime change
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Scientists and stakeholders agree that all five types of stressors matter…
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…but groups tend to downplay stressors that benefit them most
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…but groups tend to downplay stressors that benefit them most
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Outline Causes of stress A realistic vision Promising actions Prescriptions
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A realistic and hopeful pathway: reconciliation ecology Support ecosystem alongside continued
human use of region’s natural resources (co-equal goals)
Restore natural processes where practical Infrastructure, technology can also help
Yolo Bypass
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Area specialization will be needed to focus ecosystem efforts
Fish habitat in today’s Delta Fish habitat in specialized Delta
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Outline Causes of stress A realistic vision Promising actions Prescriptions
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Survey sought views on actions to help native fish—some already under way
Level of implementation: Under way, Planned, Considered, Conceptual
Discharges Fish Mgmt Flow Mgmt Invasives HabitatReduce toxics
Separate hatcheries
Increase outflows
Control invasive weeds
Tidal marsh, shallow habitat
Reduce farm fertilizers
Use conservation hatcheries
Reduce exports
Control invasive clams
Seasonal floodplains
Reduce farm pesticides
Harvest more predators
Vary flows for native fish
Prevent new invasions
Channel margin habitat
Reduce urban nonpoint
Reduce salmon harvest
Exports with canal/tunnel
Vary salinity Upstream habitat
Reduce urban point
More fish screens
Use gates to steer fish
Increase sediment
Dilute with more flows
Enforce poaching
Improve upstream flows
Remove selected dams
Truck fish around Delta/dams
Reduce entrainment
Deep water habitat
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Scientists agree on high potential for some habitat, flow actions
Level of implementation: Under way, Planned, Considered, Conceptual
Discharges Fish Mgmt Flow Mgmt Invasives HabitatReduce toxics Separate
hatcheriesIncrease outflows
Control invasive weeds
Tidal marsh, shallow habitat
Reduce farm fertilizers
Use conservation hatcheries
Reduce exports
Control invasive clams
Seasonal floodplains
Reduce farm pesticides
Harvest more predators
Vary flows for native fish
Prevent new invasions
Channel margin habitat
Reduce urban nonpoint
Reduce salmon harvest
Exports with canal/tunnel
Vary salinity Upstream habitat
Reduce urban point
More fish screens
Use gates to steer fish
Increase sediment
Dilute with more flows
Enforce poaching
Improve upstream flows
Remove selected dams
Truck fish around Delta/dams
Reduce entrainment
Deep water habitat
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Scientists disagree on potential of some other, highly uncertain actionsDischarges Fish Mgmt Flow Mgmt Invasives HabitatReduce toxics Separate
hatcheriesIncrease outflows
Control invasive weeds
Tidal marsh, shallow habitat
Reduce farm fertilizers
Use conservation hatcheries
Reduce exports
Control invasive clams
Seasonal floodplains
Reduce farm pesticides
Harvest more predators
Vary flows for native fish
Prevent new invasions
Channel margin habitat
Reduce urban nonpoint
Reduce salmon harvest
Exports with canal/tunnel*
Vary salinity Upstream habitat
Reduce urban point
More fish screens
Use gates to steer fish*
Increase sediment*
Dilute with more flows
Enforce poaching
Improve upstream flows
Remove selected dams
Truck fish around Delta/dams
Reduce entrainment
Deep water habitatLevel of implementation: Under way, Planned, Considered, Conceptual
* More than 20% answered “don’t know”
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Scientists’ top priorities: restoring natural processes within Delta and upstream
Habitat and flow cluster
82
65 62 61
3022 20 20
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Again, stakeholder priorities reflect economic interests
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Some signs of common ground?
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Lack of shared understanding of Delta science is an obstacle to effective policy Engaged stakeholders consult scientific &
gov’t reports regularly… …but key groups arrive at different
conclusions about nature of problems and solutions
Gaps are widest on actions that could be very costly for some stakeholder groups
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Scientists’ top priorities tend to be the most costly…
Cost estimates from Medellin-Azuara et al. 2013. Numbers in parentheses show share of scientists who chose the action among their “top 5”
‘s ‘s ‘s
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Outline Causes of stress A realistic vision Promising actions Prescriptions
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Delta Plan, BDCP contain elements of a reconciled Delta vision Still weak on adaptive
management and integrating science
BDCP is ambitious but narrow: Upstream management and other stressors also matter
And system is still too fragmented
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Institutional fragmentation has created unnecessary barriers to progressFragmentation has led to: Missed
opportunities Oversight gaps Conflicting
mandates Costly delays Less reliable science
A simplified model
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More effective institutions are needed to implement reconciliation
More integrated Science Planning and (adaptive) management
Regulatory oversight
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Achieving ecosystem goals will require broad public support Reconciliation efforts
will be costly (at least several hundred million $/year)
Need to communicate the goals and benefits…
…and demonstrate coordinated and cost-effective efforts Yes with state
fundingYes with higher
water bills
0%
20%
40%
60%
80%
100%
61%
39%
Do you support spending to improve conditions for native
fish species?
SOURCE: PPIC Statewide Survey (2012)
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More information available at www.ppic.orgStress Relief: Prescriptions for a Healthier Delta Ecosystem (Hanak et al. 2013) (Overview report)Aquatic Ecosystem Stressors in the Sacramento San-Joaquin Delta (Mount et al. 2012) (Stressor descriptions)Where the Wild Things Aren’t: Making the Delta a Better Place for Native Species (Moyle et al. 2012) (Reconciled Delta)Integrated Management of Delta Stressors: Institutional and Legal Options (Gray et al. 2013) (Institutional reforms)Scientist and Stakeholder Views on the Delta Ecosystem (Hanak et al. 2013) (Details from the surveys)Costs of Ecosystem Management Actions for the Sacramento- San Joaquin Delta (Medellín-Azuara et al. 2013) (Cost estimates)
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Notes on the use of these slidesThese slides were created to accompany a presentation. They do not include full documentation of sources, data samples, methods, and interpretations. To avoid misinterpretations, please contact:
Caitrin Chappelle, (415) 291- 4435, [email protected] you for your interest in this work.