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{
    "pk": 62786,
    "title": "Alternative Juvenile Production Estimate (JPE) Forecast Approaches for Sacramento River Winter-Run Chinook Salmon",
    "subtitle": null,
    "abstract": "https://doi.org/10.15447/sfews.2018v16iss4art4\nSacramento River winter-run Chinook salmon are listed under the Endangered Species Act as Endangered and there are substantial efforts to estimate, predict, and limit mortalities at various stages of their life cycle. One such effort is the annual forecast of the number of juvenile winter-run entering the Sacramento-San Joaquin Delta. The natural-origin Juvenile Production Estimate (JPE) is defined as the number of winter-run juveniles produced from natural spawning areas that enter the Delta, and its forecast is used to determine the allowable level of winter-run incidental take at the state and federal pumping facilities located in the south Delta. Current monitoring programs in the Sacramento Basin do not allow for direct estimation of the JPE and thus various methods have been used to forecast this value annually. Here we describe three alternative methods for forecasting the natural-origin JPE. The methods range from the status quo approach (Method 1), which expresses the JPE forecast only as a point estimate, to two other methods that account for forecast uncertainty to various degrees. A comparison of JPE forecasts for 2018 across the three methods indicates that relative to Method 1, Methods 2 and 3 result in lower JPE forecasts, by 24 and 18 percent, respectively, primarily owing to lower forecasts of the fry-to-smolt transition and the smolt survival rate occurring downstream of Red Bluff Diversion Dam. Because post-hoc estimates of juvenile winter-run abundance at the entrance to the Delta do not currently exist, we are unable to evaluate forecast skill among the three methods.",
    "language": "en",
    "license": {
        "name": "Creative Commons Attribution 4.0",
        "short_name": "CC BY 4.0",
        "text": "Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.\n\nNo additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.",
        "url": "https://creativecommons.org/licenses/by/4.0"
    },
    "keywords": [
        {
            "word": "Chinook Salmon, Sacramento River, winter-run, Juvenile Production Estimate, forecast, incidental take"
        }
    ],
    "section": "Research Article",
    "is_remote": true,
    "remote_url": "https://escholarship.org/uc/item/8828b7r9",
    "frozenauthors": [
        {
            "first_name": "Michael",
            "middle_name": "R.",
            "last_name": "O'Farrell",
            "name_suffix": "",
            "institution": "Southwest Fisheries Science Center, \nNational Marine Fisheries Service,\nNational Oceanic and Atmospheric Administration",
            "department": ""
        },
        {
            "first_name": "William",
            "middle_name": "H.",
            "last_name": "Satterthwaite",
            "name_suffix": "",
            "institution": "Southwest Fisheries Science Center, \nNational Marine Fisheries Service,\nNational Oceanic and Atmospheric Administration",
            "department": ""
        },
        {
            "first_name": "Albert",
            "middle_name": "N.",
            "last_name": "Hendrix",
            "name_suffix": "",
            "institution": "QEDA Consulting, LLC",
            "department": ""
        },
        {
            "first_name": "Michael",
            "middle_name": "S.",
            "last_name": "Mohr",
            "name_suffix": "",
            "institution": "Southwest Fisheries Science Center, \nNational Marine Fisheries Service,\nNational Oceanic and Atmospheric Administration",
            "department": ""
        }
    ],
    "date_submitted": "2018-10-31T07:15:39+05:30",
    "date_accepted": "2018-10-31T07:15:39+05:30",
    "date_published": "2018-12-22T13:30:00+05:30",
    "render_galley": null,
    "galleys": [
        {
            "label": "",
            "type": "pdf",
            "path": "https://journalpub.escholarship.org/jmie_sfews/article/62786/galley/48467/download/"
        }
    ]
}