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Full-Text Articles in Life Sciences
Changes In Hatchery Subsidies Of Chinook Salmon In The Salish Sea: Implications For Predators, Fisheries, And Conservation, Benjamin Nelson, Eric John Ward, Ole Shelton, Joseph H. Anderson
Changes In Hatchery Subsidies Of Chinook Salmon In The Salish Sea: Implications For Predators, Fisheries, And Conservation, Benjamin Nelson, Eric John Ward, Ole Shelton, Joseph H. Anderson
Salish Sea Ecosystem Conference
Historically, salmon hatcheries were designed to increase fishery production and to recover depleted native populations. As demands of human protein consumption increase and wild populations continue to decline due to anthropogenic impacts like climate change and habitat loss, hatcheries and stocking programs will be called on to provide food security and to supplement threatened populations. Since 1950 over 3.7 billion Chinook salmon have been released into the Salish Sea and its tributaries in Washington State and southern British Columbia. However, relatively little research has been conducted that considers the impact of hatchery subsidies on estuarine and nearshore marine ecosystems in …
Interannual Variation In Early Marine Survival Patterns Of Puget Sound Steelhead Smolts Indicates Shifting Predation Pressures, Barry A. Berejikian, Megan Moore, Steve Jeffries
Interannual Variation In Early Marine Survival Patterns Of Puget Sound Steelhead Smolts Indicates Shifting Predation Pressures, Barry A. Berejikian, Megan Moore, Steve Jeffries
Salish Sea Ecosystem Conference
Marine survival of steelhead smolts during their two week migration from river mouths to the Strait of Juan de Fuca has been estimated at 20% or less for several populations originating in Puget Sound. Low survival rates likely reduce overall smolt-to-adult return rates and limit recovery of Puget Sound steelhead populations. Harbor seals are generalist predators known to eat juvenile salmon in the Salish Sea. Harbor seals were captured in 2014 (12 seals) and 2016 (16 seals) and outfitted with acoustic telemetry receivers and GPS tags to quantify likely predation events and estimate foraging area overlap with acoustically tagged steelhead …
Foraging Opportunity: A Method Of Monitoring Shorebird Migration And Overwintering Sites In A Changing Environment, James Rourke, Wendell Challenger, Ron Ydenberg
Foraging Opportunity: A Method Of Monitoring Shorebird Migration And Overwintering Sites In A Changing Environment, James Rourke, Wendell Challenger, Ron Ydenberg
Salish Sea Ecosystem Conference
Roberts Bank within the Fraser River estuary, BC contains important migratory stopover and overwintering habitat for shorebirds such as the western sandpiper (Calidris mauri) and the Pacific dunlin (Calidris alpina pacifica). Shorebirds are especially abundant during northward migration, with single-day counts numbering into the hundreds of thousands of birds. Previous research and ecological theory have demonstrated that site usage by shorebirds is influenced by numerous factors, including prey availability and predation risk. We developed a concept termed “foraging opportunity” that quantifies shorebird food availability (biofilm, meiofauna, and macrofauna) in relation to predation danger from hunting falcons. Foraging opportunity was determined …