Lost Watersheds: Barriers, Aquatic Habitat Connectivity, and Salmon Persistence in the Willamette and Lower Columbia River Basins

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Synthesis, part of a Special Feature on Pathways to Resilient Salmon Ecosystems Evolutionary History, Habitat Disturbance Regimes, and Anthropogenic Changes: What Do These Mean for Resilience of Pacific Salmon Populations? (2009, background): “Finally, salmon historically had access to a wide range of habitats, but current access is much reduced (Pess et al. 2005a,b, Sheer and Steel 2006, McClure et al. 2008).”
Effectiveness monitoring of fish passage facilities: historical trends, geographic patterns and future directions (2010, background): “Fragmentation of aquatic habitat by anthropogenic barriers is frequently associated with extirpation or extinction of fish species (Nehlsen et al. 1991; Slaney et al. 1996; Sheer and Steel 2006) and with severe negative consequences at the ecosystem level (Fahrig 2003; Nilsson et al.”
Effects of ocean sprawl on ecological connectivity: impacts and solutions (2017, background): “…structures can directly affect the passage of diadromous ﬁ sh, between both marine and freshwater environments used at different life-history stages (Sheer and Steel, 2006; Aprahamian et al., 2010), and also the movement of ﬁ sh and invertebrates among estuarine breeding and nursery grounds, and…”