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The Influence of Environmental Variation on the Columbia River Estuarine Fish Community: Implications for Predation on Juvenile Salmonids

Published on Dec 30, 2016
路 DOI :10.23849/npafcb6/33.44
Laurie Weitkamp , Thomas Good + 1 AuthorsDaniel D. Roby30
Estimated H-index: 30
Abstract
  • References (12)
  • Citations (0)
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References12
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#1Amanda J. Gladics (OSU: Oregon State University)H-Index: 7
#2Robert M. SuryanH-Index: 23
Last. Laura Z. Filliger (URI: University of Rhode Island)H-Index: 3
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Variable ocean conditions can greatly impact prey assemblages and predator foraging in marine ecosystems. Our goal was to better understand how a change in ocean conditions influenced dietary niche overlap among a suite of midtrophic-level predators. We examined the diets of three fishes and one seabird off central Oregon during two boreal summer upwelling periods with contrasting El Nino (2010) and La Nina (2011) conditions. We found greater niche specialization during El Nino and increased nic...
7 CitationsSource
#1Joseph P. Fisher (OSU: Oregon State University)H-Index: 11
#2Laurie A. Weitkamp (NOAA: National Oceanic and Atmospheric Administration)H-Index: 14
Last. Marc Trudel (Fisheries and Oceans Canada)H-Index: 24
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AbstractSeveral evolutionarily significant units (ESUs) of Columbia River asin Chinook Salmon Oncorhynchus tshawytscha and Coho Salmon O. kisutch are listed as threatened or endangered under the U.S. Endangered Species Act. Yet little is known about the spatial and temporal distributions of these ESUs immediately following ocean entry, when year-class success may be determined. We documented differences in dispersal patterns during the early ocean period among groups defined by ESU, adult run ti...
25 CitationsSource
#1William T. Peterson (NMFS: National Marine Fisheries Service)H-Index: 30
#2Cheryl A. MorganH-Index: 19
Last. Edmundo Casillas (NMFS: National Marine Fisheries Service)H-Index: 29
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Yearling juvenile coho and Chinook salmon were sampled on 28 cruises in June and September 1981鈥85 and 1998鈥07 in continental shelf and oceanic waters off the Pacific Northwest. Oceanographic variables measured included temperature, salinity, water depth, and chlorophyll concentration (all cruises) and copepod biomass during the cruises from 1998鈥07. Juvenile salmonids were found almost exclusively in continental shelf waters, and showed a patchy distribution: half were collected in 鈭5% of the c...
43 CitationsSource
#1Donald E. LyonsH-Index: 1
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#1Michela Burla (OHSU: Oregon Health & Science University)H-Index: 3
#2Ant贸nio M. Baptista (OHSU: Oregon Health & Science University)H-Index: 30
Last. Sergey Frolov (OHSU: Oregon Health & Science University)H-Index: 10
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[1] As integral capability within an end-to-end observatory for the Columbia River estuary-plume-shelf system, we routinely create simulation databases of 3-D baroclinic circulation with unstructured grid models SELFE (Semi-implicit Eulerian-Lagrangian Finite Element) and ELCIRC (Eulerian-Lagrangian Circulation). Here, 1999鈥2006 SELFE simulations are used to study plume variability at multiple temporal scales: interannual, seasonal, and event scale. Time series of plume metrics, together with cl...
45 CitationsSource
#1Steven J. Bograd (NOAA: National Oceanic and Atmospheric Administration)H-Index: 44
#2Isaac D. Schroeder (NOAA: National Oceanic and Atmospheric Administration)H-Index: 15
Last. Franklin B. Schwing (NOAA: National Oceanic and Atmospheric Administration)H-Index: 33
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[1]聽Changes in the amplitude and phasing of seasonal events (phenology) can affect the functioning of marine ecosystems. Phenology plays a particularly critical role in eastern boundary ecosystems, which are driven largely by the seasonal cycle of coastal upwelling. Here we develop and describe a set of indicators that quantify the timing, evolution, intensity, and duration of coastal upwelling in the California Current large marine ecosystem (CCLME). There is significant interannual variability...
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#1Marti J. AndersonH-Index: 48
#2Ray N. GorleyH-Index: 3
Last. Mj AndersomH-Index: 1
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#1Donald E. LyonsH-Index: 14
#2Daniel D. RobyH-Index: 30
Last. Ken CollisH-Index: 16
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We examined spatial and temporal foraging patterns of Caspian terns and double-crested cormorants nesting in the Columbia River estuary, to potentially identify circumstances where juvenile salmonids listed under the U.S. Endangered Species Act might be more vulnerable to predation by these avian piscivores. Data were collected during the 1998 and 1999 breeding seasons, using point count surveys of foraging birds at 40 sites along the river鈥檚 banks, and using aerial strip transect counts through...
15 CitationsSource
#1Brad A. Ryan (NMFS: National Marine Fisheries Service)H-Index: 6
#2Steven G. Smith (NMFS: National Marine Fisheries Service)H-Index: 25
Last. John W. Ferguson (NMFS: National Marine Fisheries Service)H-Index: 10
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Abstract Caspian terns Sterna caspia and double-crested cormorants Phalacrocorax auritus that colonize dredge-spoil islands in the Columbia River estuary prey upon millions of juvenile Pacific salmonids annually. We estimated the relative vulnerability of various salmonid stocks to these predators by using data from passive integrated transponder (PIT) tags detected on these colonies; 96,382 tags were detected from the 1998鈥2000 migration years. On tern colonies, detection rates were highest for...
67 CitationsSource
#1Philip W. Mote (UW: University of Washington)H-Index: 39
#2Nathan J. Mantua (UW: University of Washington)H-Index: 37
[1]聽Coastal upwelling helps set the physical context for marine ecosystems, and upwelling zones are among the most productive regions of the global ocean. Unlike earlier models, two state-of-the-art climate models exhibit little change during the next century in the magnitude and seasonality of coastal upwelling, but climate models are still probably not sufficiently developed (for example, they underestimate interdecadal variability in upwelling) to provide valid projections of this key compone...
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