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Data and Model-Based Estimates from Black Brant (Branta bernicla nigricans) Fall Age Ratio Surveys at Izembek Lagoon, Alaska

Data Download [84KB] | Metadata | AK Science Portal | Project Site | Date Range: 1963 - 2023


These data are in 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. The first file is observation data for the birds' age classes during surveys, and associated survey characteristics. The second file contains model-based estimates of age ratios by year along with SE, and 95% Bayesian credible intervals around estimates.

Author(s): Patil, V. P.; Amundson, C. L.; Ward, D. H.; Williams, A. R.

Suggested Citation:
Patil, V. P., Amundson, C. L., Ward, D. H. and 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 History:
First release: March 2020
Revised: December 2020 (ver. 2.0)
Revised: December 2021 (ver. 3.0)
Revised: January 2023 (ver. 4.0)
Revised: December 2023 (ver. 5.0)

Referenced Publication(s):

Ward, D. H., C. L. Amundson, R. A. Stehn, and C. P. Dau. 2018. Long-term trends in fall age ratios of black brant. Journal of Wildlife Management 82(2):362-373. doi:10.1002/jwmg.21388


DataID: 284 | doi:10.5066/P9QIJIU2 | Date Posted Online: 2020-03-02 | Last Updated: 2023-12-22 08:40:45

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