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

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.

Data and Resources

Field Value
accessLevel public
bureauCode {010:12}
catalog_@context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
catalog_conformsTo https://project-open-data.cio.gov/v1.1/schema
catalog_describedBy https://project-open-data.cio.gov/v1.1/schema/catalog.json
datagov_dedupe_retained 20220725164314
identifier USGS:ASC256
metadata_type geospatial
modified 20220106
old-spatial {"type": "Polygon", "coordinates": [[[-163.14, 55.15], [-163.14, 55.42], [ -161.78, 55.42], [ -161.78, 55.15], [-163.14, 55.15]]]}
publisher U.S. Geological Survey
publisher_hierarchy Department of the Interior > U.S. Geological Survey
resource-type Dataset
source_datajson_identifier true
source_hash ed4245df87202ad61ace5e916a9eb9f21c968109
source_schema_version 1.1
spatial {"type": "Polygon", "coordinates": [[[-163.14, 55.15], [-163.14, 55.42], [ -161.78, 55.42], [ -161.78, 55.15], [-163.14, 55.15]]]}
theme {geospatial}
Groups
  • AmeriGEOSS
  • National Provider
  • North America
Tags
  • alaska
  • amerigeo
  • amerigeoss
  • animal-populations
  • animals-vertebrates
  • biota
  • birds
  • black-brant
  • brent-goose
  • ckan
  • computational-methods
  • ecological-dynamics
  • environment
  • geo
  • geoss
  • izembek-lagoon
  • izembek-national-wildlife-refuge
  • mathematical-modeling
  • migratory-birds
  • national
  • north-america
  • population-dynamics
  • species-life-history
  • species-population-interactions
  • united-states
  • usgs-asc256
  • waterfowl
  • wildlife-biology
isopen False
license_id notspecified
license_title License not specified
maintainer U.S. Geological Survey, Alaska Science Center
maintainer_email ascweb@usgs.gov
metadata_created 2025-11-21T23:33:33.158260
metadata_modified 2025-11-21T23:33:33.158264
notes 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.
num_resources 2
num_tags 28
title Data and Model-Based Estimates from Black Brant (Branta bernicla nigricans) Fall Age Ratio Surveys at Izembek Lagoon, Alaska