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- W2181574239 abstract "Fail-rim Chinook salmon (Oncorhynchus tsharo~cha) escapement in the Tuolunme River. Central Valley of California, has declined from 130,000 salmon during the 1940s to less than 500 salmon during the early 1990s and in 2007. The Tuolumne River's naturally produced fail-run Chinook salmon population was judged to be at a high risk of extinction since 1990 because escapement has repeatedly declined to low levels, the population has declined rapidly, and the mean percentage of hatchery fish in the escapement has been high. A potential consequence of the population declining to 157 salmon from 1990 to 1992 and the resulting loss of genetic viability is that the population's productivity declined by about 50% from 1996 to 2005. The decline in escapement is primarily due to inadequate minimum iv.stream flow releases from La Grange Dam in late winter and spring during the non-flood years. In most years, except spring 2005, the number of smolts migrating from the Tuolmnne River has been a good predictor of adult recruitment. The estimated number of smoltsized ouUnigrants passing rotary screw traps near the mouth of the Tuolumne River approximately doubled in response to 2- to 3-day, 3,000 cfs pulse flows in late winter that inundated about 500 acres of floodplain habitat. Adult recruitment more than doubled when prolonged late winter pulse flows of at least 3,000 cfs occurred and the water temperatures near the river's mouth were kept below 15°C through at least early May. Another problem is that up to 58% of Mew, ed River Hatchery Chinook salmon strayed to the Sacramento River Basin whenever flows in the San Joaquin River were less than 3,500 cfs for 10 days in late October. Other analyses show that spawner abundance, spawning habitat degradation, and the harvest of adult salmon in the ocean have not caused the decline in escapement." @default.
- W2181574239 created "2016-06-24" @default.
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- W2181574239 date "2009-01-01" @default.
- W2181574239 modified "2023-09-26" @default.
- W2181574239 title "The High Risk of Extinction for the Natural Fail-Run Chinook Salmon Population in the Lower Tuolumn.e River due to Insufficient Instr~am Flow Releases" @default.
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