Ecology of Juvenile Salmon in Shallow Tidal Freshwater Habitats in the Vicinity of the Sandy River Delta, Lower Columbia River, 2008

Sather, Nichole K.; Johnson, Gary E.; Storch, Adam J.; Teel, David J.; Skalski, John R.; Jones, Tucker; Dawley, Earl M.; Zimmerman, Shon A.; Borde, Amy B.; Mallette, Christine; Farr, Ruth A.

doi:10.2172/962847

Cited by 9 publications

(35 citation statements)

References 14 publications

(24 reference statements)

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“…Based on acoustic telemetry of tagged fish (>95 mm), juvenile salmon are residing in shallow, tidal freshwater habitats during winter (see Section 3.3.2 and Johnson et al 2011). Future investigations to tag smaller juvenile salmon will provide further information on this topic.…”

Section: "Wintertime Use Of Off-channel Reference and Restored Areasmentioning

confidence: 99%

“…These sites were selected for the purposes of the Before-After-Reference-Impact (BARI) design (see below). Full descriptions of habitat characteristics for each of the SRD sites are provided by Sobocinski et al (2008) and Sather et al (2009). …”

Section: Study Areamentioning

confidence: 99%

“…Up to 15 sites were randomly sampled seasonally across three habitat strata (main channel, off channel, and wetland channel; Figure 2.3) within a rotational panel design. Details pertaining to site selection criteria are described by Sather et al (2011). For the current reporting period, LRR sites were sampled during winter and summer 2011; high flow conditions prevented the spring 2011 sampling event.…”

Section: Sampling Designmentioning

confidence: 99%

“…The remaining individuals (i.e., non-salmon taxa) were placed in separate holding buckets until processing. When catches were large, non-salmon fishes were subsampled according to the protocol described by Sather et al (2011). To minimize handling stress, salmon and steelhead were anesthetized using a 40-mg/L solution of MS-222 (tricaine methanesulfonate) prior to processing.…”

Section: Fish Capturementioning

confidence: 99%

“…Previous research from 2007 through 2010 were reported on an annual basis by Sobocinski et al (2008), Sather et al (2009), andJohnson et al (2011a) and can be downloaded from http://efw.bpa.gov/IntegratedFWP/reportcenter.aspx.…”

Section: Introductionmentioning

confidence: 99%

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Multi-Scale Action Effectiveness Research in the Lower Columbia River and Estuary, 2011 - FINAL ANNUAL REPORT

Sather¹,

Storch²,

Johnson³

et al. 2012

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Section: "Wintertime Use Of Off-channel Reference and Restored Areasmentioning

confidence: 99%

Section: Study Areamentioning

confidence: 99%

Section: Sampling Designmentioning

confidence: 99%

Section: Fish Capturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Multi-Scale Action Effectiveness Research in the Lower Columbia River and Estuary, 2011 - FINAL ANNUAL REPORT

Sather¹,

Storch²,

Johnson³

et al. 2012

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A spatially and temporally explicit risk assessment for salmon from a prey base exposed to agricultural insecticides

Poletika¹,

Teply

Dominguez

et al. 2012

Integr Envir Assess & Manag

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This risk assessment applied a framework for determining probable co-occurrence of juvenile spring Chinook salmon (Oncorhynchus tshawytscha) with agricultural pesticides in the Willamette Basin, Oregon (Teply et al. this issue) to characterize risk to the threatened population. The assessment accounted for spatial and temporal distribution of 6 acetylcholinesterase-inhibiting insecticides in salmonid habitat within the basin and their relative contributions to mixture toxicity estimated from chemical monitoring data. The 6 insecticides were chlorpyrifos, diazinon, malathion, carbaryl, carbofuran, and methomyl. Seasonal distributions of the juvenile salmon prey base across the basin were determined and compared to co-occurrence with the insecticide mixture to determine the probability of prey reduction and reduced production of juvenile fish. Probability of effect on freshwater aquatic invertebrates was based on acute toxicity species sensitivity distributions (normalized to the most potent compound, chlorpyrifos) using a novel approach to apply the toxicological concept of concentration addition to species sensitivity distributions with differing slopes. The chlorpyrifos distribution was then used to determine relative sensitivity among various species tested within the important taxa making up the prey base. A prey base index was devised, incorporating diet composition and prey availability, to evaluate the indirect effects of the insecticide mixture on juvenile salmon production occurring as a result of a reduction in the prey base. Our analysis targeted fish use of backwater and off-channel habitat units, because they generally coincide with agricultural lands in lowlands and represent shallow habitat with limited water exchange. The percentage of agricultural land use within 300 m of critical habitat stream reaches was used to scale chemical measurement data from a site with high agricultural land use across the full extent of the basin to provide estimates of chemical exposure in each reach. Seasonal impacts were evaluated from mean monthly concentrations. Stressor impact on 5 key taxa was evaluated at each time step and for each reach, and the outcome was compared to a conservation threshold assigned to the prey base index. Only 13% of juveniles reared in backwater, off-channel habitat within 300 m of agricultural land. Percent reduction of carrying capacity as a consequence of reduced prey was estimated to be 5% over the entire brood year. This can be considered lost capacity that is probably compensated elsewhere via increased occupancy (emigration to other habitat units within the reach), which is not accounted for in the model.

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Distribution, Size, and Origin of Juvenile Chinook Salmon in Shallow‐Water Habitats of the Lower Columbia River and Estuary, 2002–2007

et al. 2012

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We monitored fish assemblages monthly at estuarine and tidal freshwater sites in the lower Columbia River and estuary from January 2002 through September 2007 in order to identify specific salmon stocks and migration stages that may benefit from habitat restoration initiatives. We report landscape‐scale and seasonal variation in abundance, size, hatchery production (based on adipose fin clips), and genetic stock of origin of juvenile Chinook salmon Oncorhynchus tshawytscha. From fish implanted with coded wire tags (CWTs), we also determined the sites of release and inferred migration patterns. Chinook salmon were found in diverse life history stages and forms, including fry migrants, fingerlings, and (fewer) yearlings. Abundance increased in February and decreased in August, but salmon were present in all months each year. Spatial gradients in abundance and size were strong, with fewer but larger fish in brackish than in tidal freshwater zones. Overall, 30% of the Chinook salmon measured were fry (≤60 mm) that were likely naturally produced fish. These occurred at higher mean monthly proportions in tidal freshwater than in estuarine zones. In contrast, most larger fish were probably raised in hatcheries. Genetic stock assessment revealed that the majority of the Chinook salmon analyzed were from fall‐run stock groups originating in the lower Columbia River, with 15% originating from other stock groups. Of these minority contributors, about 6% were identified as upper Columbia River summer–fall‐run Chinook salmon while seven other stock groups accounted for the remainder, including 3% from transplants originating in southern Oregon's Rogue River. Recaptures of tagged fish revealed maximum migration times of 143 d for subyearlings and 52 d for yearlings, and both CWT and genetic data indicated that fall Chinook salmon from coastal rivers occasionally entered the estuary. These data demonstrated a widespread temporal and spatial distribution of subyearling Chinook salmon in shallow‐water habitats of the lower Columbia River and estuary. Received June 28, 2011; accepted February 28, 2012

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Ecology of Juvenile Salmon in Shallow Tidal Freshwater Habitats in the Vicinity of the Sandy River Delta, Lower Columbia River, 2008

Cited by 9 publications

References 14 publications

Multi-Scale Action Effectiveness Research in the Lower Columbia River and Estuary, 2011 - FINAL ANNUAL REPORT

Multi-Scale Action Effectiveness Research in the Lower Columbia River and Estuary, 2011 - FINAL ANNUAL REPORT

A spatially and temporally explicit risk assessment for salmon from a prey base exposed to agricultural insecticides

Distribution, Size, and Origin of Juvenile Chinook Salmon in Shallow‐Water Habitats of the Lower Columbia River and Estuary, 2002–2007

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