Salmon-Net | science spotlights

Human disturbances altering sockeye life-history

Human disturbances altering sockeye life-history

Human interference in the natural world affects many of the world’s fishes, but anadromous species are particularly vulnerable to anthropogenic disturbances due to their dependence on both freshwater and marine ecosystems…

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Well-intentioned transport of hatchery fish may erode salmon biodiversity

Well-intentioned transport of hatchery fish may erode salmon biodiversity

Since the 1980s, hatchery-reared Chinook salmon in the Central California Valley have been transported increasing distances from their source hatcheries to circumvent survival bottlenecks. Although trucking increases juvenile survival, the further fish are trucked, the more likely they are to stray, i.e. fail to return to their home stream to spawn…

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Shifting habitat mosaics stabilize salmon production

Shifting habitat mosaics stabilize salmon production

Production of Pacific salmon is dependent on the presence of a diversity of habitats in their natal watersheds to provide the resources needed during different life stages. Freshwater habitats aren’t static, however, but rather are highly dynamic under natural conditions…

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Evolving salmon use in the far north

Evolving salmon use in the far north

Subsistence hunting, trapping, and fishing have enabled Indigenous peoples to flourish for millennia under the harsh conditions prevalent in the High Arctic, so it is no surprise that these activities are also deeply embedded in the values, traditions, and customs of local communities…

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Human impacts driving loss of spring-run Chinook

Human impacts driving loss of spring-run Chinook

Analysis of changes in Chinook genetic structure over time indicates that human impacts on watersheds have induced a shift in the relative frequency of spring-run and fall-run alleles at a single locus, with negative implications for Chinook phenotypic variation and adaptive potential…

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Demographic structure of Chinook populations is shifting

Demographic structure of Chinook populations is shifting

The demographic structure of anadromous salmon populations is controlled by complex interactions among numerous biotic and abiotic factors, including ocean and climatic conditions, predator–prey dynamics, interspecific competition, hatchery production, and fisheries practices…

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