Data and Model-Based Estimates from Black Brant (Branta bernicla nigricans) Fall Age Ratio Surveys at Izembek Lagoon, Alaska Current Citation: Patil, V.P., Amundson, C.L., Ward, D.H., Williams, A.R., 2020, Data and model-based estimates from Black Brant (Branta bernicla nigricans) fall age ratio surveys at Izembek Lagoon, Alaska (ver 5.0, December 2023): U.S. Geological Survey data release, https://doi.org/10.5066/P9QIJIU2 ======================================= Version 1.0 posted online March 2020 Original Citation: Amundson, C.L., Ward, D.H. Fitzmorris, P.J., 2020, Data and model-based estimates from Black brant (Branta bernicla nigricans) fall age ratio surveys at Izembek Lagoon, Alaska: U.S. Geological Survey data release, https://doi.org/10.5066/P9QIJIU2 Overview: Two tables relating to fall age ratios (number of juvenile birds : total birds aged) of Black brant (Branta bernicla nigricans) staging in Izembek Lagoon, Alaska since 1963. Data: blackBrant_fallAgeRatioSurveyCount_izembekNWR_amundson.csv blackBrant_fallAgeRatioModelEstimate_izembekNWR_amundson.csv ======================================== Version 2.0 posted online December 2020 Appended: one additional year (2020) of data to both tables. All original data retained. Updated metadata record: added additional author, describes current data presentation, follows current USGS Alaska Science Center metadata standards and conventions. Renamed tables: removed author name from title to increase filename durability Data: blackBrant_fallAgeRatioSurveyCount_izembekNWR.csv blackBrant_fallAgeRatioModelEstimate_izembekNWR.csv ======================================== Version 3.0 posted online December 2021 Appended: one additional year (2021) of data to both tables. All original data retained. ======================================== Version 4.0 posted online January 2023 Appended: one additional year (2022) of data to both tables. All original data retained. Removed: "observer" column from publicly released data Updated metadata record: to clarify entity and attribute definitions ======================================== Version 5.0 posted online December 2023 Appended: one additional year (2023) of data to both tables. All original data retained.