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

Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Amundson, C.L. (ORCID: 0000-0002-0166-7224)
Originator: Ward, D.H. (ORCID: 0000-0002-5242-2526)
Originator: Fitzmorris, P.J.
Publication_Date: 20200302
Title:
Data and Model-Based Estimates from Black Brant (Branta bernicla nigricans) Fall Age Ratio Surveys at Izembek Lagoon, Alaska
Geospatial_Data_Presentation_Form: tabular digital data
Publication_Information:
Publication_Place: Anchorage, AK
Publisher: U.S. Geological Survey, Alaska Science Center
Other_Citation_Details:
Suggested 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
Online_Linkage: https://doi.org/10.5066/P9QIJIU2
Larger_Work_Citation:
Citation_Information:
Originator: U.S. Geological Survey, Alaska Science Center
Publication_Date: 2009
Title: Population Ecology of Waterfowl and Loons
Geospatial_Data_Presentation_Form: website
Series_Information:
Series_Name: Alaska Science Portal
Issue_Identification: 377
Publication_Information:
Publication_Place: Anchorage, AK
Publisher: U.S. Geological Survey, Alaska Science Center
Other_Citation_Details:
This is a link to the broader USGS Alaska Science Center research project supported by these data. Users will find a description of the research project and links to associated reports, publications, and data products.
Online_Linkage: https://alaska.usgs.gov/portal/project.php?project_id=377
Description:
Abstract:
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.
Purpose:
Each fall, the entire population of Black brant stages during fall migration in Izembek Lagoon, Alaska. Since 1963, surveys have been conducted to record the number of juvenile (i.e., first-year birds) and adult (i.e., birds ≥ 2 years old) brant and estimate the age ratio (number of juvenile birds : total birds aged) for the overall population. This fall age ratio estimate is the first measure of annual productivity for the entire population and is a potential index of recruitment given that most first-year mortality in brant occurs between hatch and migration to Izembek.
Supplemental_Information:
Here we provide data from these surveys 1963–2019. These data were previously analyzed through 2015 in Ward et al (2018). We provide updated model estimates through 2019 using the same methods. Model estimates will be updated annually in future versions of this data release. Note that all annual estimates will change as the model is updated to account for new information informing model parameters. Therefore, historical age ratio estimates will vary slightly from those published in Ward et al (2018).
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1963
Ending_Date: 2019
Currentness_Reference: observed
Status:
Progress: In work
Maintenance_and_Update_Frequency: Annually
Spatial_Domain:
Description_of_Geographic_Extent: Izembek National Wildlife Refuge, Alaska Peninsula
Bounding_Coordinates:
West_Bounding_Coordinate: -163.14
East_Bounding_Coordinate: -161.78
North_Bounding_Coordinate: 55.42
South_Bounding_Coordinate: 55.15
Keywords:
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: biota
Theme:
Theme_Keyword_Thesaurus: NASA GCMD Earth Science Keywords Thesaurus
Theme_Keyword: Earth science
Theme_Keyword: Biological classification
Theme_Keyword: Animals/Vertebrates
Theme_Keyword: Birds
Theme_Keyword: Biosphere
Theme_Keyword: Ecological dynamics
Theme_Keyword: Species/population interactions
Theme_Keyword: Species life history
Theme:
Theme_Keyword_Thesaurus: USGS CSA Biocomplexity Thesaurus
Theme_Keyword: Migratory birds
Theme_Keyword: Waterfowl
Theme_Keyword: Animal populations
Theme_Keyword: Population dynamics
Theme:
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: Wildlife biology
Theme_Keyword: Computational methods
Theme_Keyword: Mathematical modeling
Place:
Place_Keyword_Thesaurus: USGS Geographic Names Information System (GNIS)
Place_Keyword: Alaska
Place_Keyword: Izembek Lagoon
Place_Keyword: Izembek National Wildlife Refuge
Taxonomy:
Keywords/Taxon:
Taxonomic_Keyword_Thesaurus: None
Taxonomic_Keywords: Brant Goose
Taxonomic_System:
Classification_System/Authority:
Classification_System_Citation:
Citation_Information:
Originator: Integrated Taxonomic Information System
Publication_Date: Unknown
Title: Integrated Taxonomic Information System
Geospatial_Data_Presentation_Form: online database
Series_Information:
Series_Name: ITIS
Issue_Identification: TSN 175011, 714723
Publication_Information:
Publication_Place: online
Publisher: ITIS-North America
Other_Citation_Details:
Taxonomic details retrieved 2020-01-29 from the Integrated Taxonomic Information System on-line database https://www.itis.gov
Online_Linkage: https://www.itis.gov
Taxonomic_Procedures:
Avian species were identified by skilled observers in the field based on plumage, behavior, and vocalizations
Taxonomic_Completeness:
Taxonomy is complete for all samples. No vouchers were collected.
Taxonomic_Classification:
Taxon_Rank_Name: Kingdom
Taxon_Rank_Value: Animalia
Taxonomic_Classification:
Taxon_Rank_Name: Subkingdom
Taxon_Rank_Value: Bilateria
Taxonomic_Classification:
Taxon_Rank_Name: Infrakingdom
Taxon_Rank_Value: Deuterostomia
Taxonomic_Classification:
Taxon_Rank_Name: Phylum
Taxon_Rank_Value: Chordata
Taxonomic_Classification:
Taxon_Rank_Name: Subphylum
Taxon_Rank_Value: Vertebrata
Taxonomic_Classification:
Taxon_Rank_Name: Infraphylum
Taxon_Rank_Value: Gnathostomata
Taxonomic_Classification:
Taxon_Rank_Name: Superclass
Taxon_Rank_Value: Tetrapoda
Taxonomic_Classification:
Taxon_Rank_Name: Class
Taxon_Rank_Value: Aves
Taxonomic_Classification:
Taxon_Rank_Name: Order
Taxon_Rank_Value: Anseriformes
Taxonomic_Classification:
Taxon_Rank_Name: Family
Taxon_Rank_Value: Anatidae
Taxonomic_Classification:
Taxon_Rank_Name: Subfamily
Taxon_Rank_Value: Anserinae
Taxonomic_Classification:
Taxon_Rank_Name: Genus
Taxon_Rank_Value: Branta
Taxonomic_Classification:
Taxon_Rank_Name: Species
Taxon_Rank_Value: Branta bernicla
Applicable_Common_Name: Brant
Applicable_Common_Name: Brant Goose
Applicable_Common_Name: Brent Goose
Applicable_Common_Name: TSN 175011
Taxonomic_Classification:
Taxon_Rank_Name: Subspecies
Taxon_Rank_Value: Branta bernicla nigricans
Applicable_Common_Name: Pacific Black Brant
Applicable_Common_Name: Black Brant
Applicable_Common_Name: TSN 714723
Access_Constraints: None
Use_Constraints:
It is requested that the authors and the USGS Alaska Science Center be cited for any subsequent publications that reference this dataset.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey, Alaska Science Center
Contact_Address:
Address_Type: Mailing and Physical
Address: 4210 University Dr.
City: Anchorage
State_or_Province: Alaska
Postal_Code: 99508
Country: USA
Contact_Voice_Telephone: 907-786-7000
Contact_Electronic_Mail_Address: ascweb@usgs.gov
Data_Set_Credit:
US Fish and Wildlife Service, Izembek National Wildlife Refuge collected and managed these data in most years. Beginning in 1985, USGS intermittently led data collection, management, and analysis of the data. We publish these complete data with USFWS permission.
Cross_Reference:
Citation_Information:
Originator: Ward, D.G
Originator: Amundson, C.L.
Originator: Stehn, R.A.
Originator: Dau, C.P.
Publication_Date: 2018
Title: Long-term trends in fall age ratios of black brant
Geospatial_Data_Presentation_Form: journal article
Series_Information:
Series_Name: Journal of Wildlife Management
Issue_Identification: 82(2):362-373
Publication_Information:
Publication_Place: online
Publisher: The Wildlife Society
Other_Citation_Details:
Ward, D.H., Amundson, C.L., Stehn, R.A., Dau, C.P. 2018. Long-term trends in fall age ratios of black brant. Journal of Wildlife Management 82(2):362-373 doi:10.1002/jwmg.21388
Online_Linkage: https://doi.org/10.1002/jwmg.21388
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Counts and age identification are affected by conditions in the field such as weather and light. Surveys after 1995 included flocks at at offshore eelgrass meadows that had been underrepresented in years prior. See Ward et al 2018 for additional details of field observations and counts. Data were cross-checked and verified against field worksheets.
Logical_Consistency_Report:
Attribute values fall within expected ranges and data were proofed for the presence of duplication and omission.
Completeness_Report:
No data were omitted and there are no missing data. Blank cells indicate data were not collected or not provided and are explained in the Attribute definitions.
Lineage:
Methodology:
Methodology_Type: Field
Methodology_Description:
Surveys were generally conducted from elevated shoreline locations that provided unobstructed views of geese as they fed on eelgrass close to shore or at consistent roosting and gritting locations. In recent years (>1995), observers occasionally used boats to access and survey brant flocks at offshore eelgrass meadows that had been under-represented in the early years (1960s to 1980s) of age ratio surveys. We selected locations for observations that maximized visibility of geese and accounted for vantage point and weather conditions, such as precipitation, sun glare, and especially wind strength and direction, which are dominating forces in this region. We aged geese while viewing a flock through spotting scopes (10–120×) and tallying adult and juveniles on a hand counter. We distinguished juvenile brant from adults by the presence of white edging on the distal ends of secondary wing coverts. We typically started scans at one end of the flock and moved through the flock from closest to the distant edge usually until we aged ≥30% of the flock. We took care not to age birds only at the edge of flock, where juveniles tend to concentrate. During a flock survey, observers recorded the location, date, time of observation, tide stage (flood, ebb, low, high), number of adults and juveniles aged, and approximate total flock size (Ward et al 2018).
Source_Information:
Source_Citation:
Citation_Information:
Originator: Ward, D.H.
Originator: Amundson, C.L.
Originator: Stehn, R.A.
Originator: Dau, C.P.
Publication_Date: 2018
Title: Long-term trends in fall age ratios of black brant
Geospatial_Data_Presentation_Form: journal article
Series_Information:
Series_Name: Journal of Wildlife Management
Issue_Identification: 82(2):362-373
Publication_Information:
Publication_Place: online
Publisher: Wiley
Other_Citation_Details:
Ward, D.H., Amundson, C.L., Stehn, R.A., Dau, C.P. 2018. Long-term trends in fall age ratios of black brant. Journal of Wildlife Management 82(2):362-373 doi:10.1002/jwmg.21388
Online_Linkage: https://doi.org/10.1002/jwmg.21388
Type_of_Source_Media: publication
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2018
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: Ward et al 2018
Source_Contribution:
Describes details of field survey methods and the model used for age ratio estimates.
Process_Step:
Process_Description:
We analyzed age ratio data using logistic regression models implemented in a Bayesian framework. We investigated variation in fall age ratios associated with sampling location, an index of flock size, survey effort, day of season, observer, survey platform (boat or land based) and tide stage. Annual predicted age ratios were standardized by survey effort and day of season.
Source_Used_Citation_Abbreviation: Ward et al 2018
Process_Date: Unknown
Spatial_Data_Organization_Information:
Indirect_Spatial_Reference:
Geographic location names represent general survey locations in and around Izembek National Wildlife Refuge.
Direct_Spatial_Reference_Method: Point
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 0.001
Longitude_Resolution: 0.001
Geographic_Coordinate_Units: Decimal degrees
Geodetic_Model:
Horizontal_Datum_Name: World Geodetic System of 1984
Ellipsoid_Name: World Geodetic System of 1984
Semi-major_Axis: 6378137
Denominator_of_Flattening_Ratio: 298.257223563
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: blackBrant_fallAgeRatioSurveyCount_izembekNWR_amundson
Entity_Type_Definition:
Table with Black brant count data for fall age ratio estimates at Izembek NWR. Presented in a Comma Separated Value (CSV) formatted table.
Entity_Type_Definition_Source: Author defined
Attribute:
Attribute_Label: flkID
Attribute_Definition: Unique ID for each flock surveyed
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain:
Unique ID from a concatinations of the survey year and a sequential survey number
Attribute:
Attribute_Label: flksize
Attribute_Definition:
Flock size (in birds) for each flock estimated by observers. Blank cells represent missing data.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 3
Range_Domain_Maximum: 30000
Attribute:
Attribute_Label: year
Attribute_Definition: Survey year
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1963
Range_Domain_Maximum: 2019
Attribute:
Attribute_Label: longitude_WGS84
Attribute_Definition: Survey location longtitude
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -163.06606
Range_Domain_Maximum: -161.7791
Attribute_Units_of_Measure: Decimal degrees (WGS84)
Attribute:
Attribute_Label: latitude_WGS84
Attribute_Definition: Survey location latitude
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 55.17192
Range_Domain_Maximum: 55.41996
Attribute_Units_of_Measure: Decimal degrees (WGS84)
Attribute:
Attribute_Label: nadults
Attribute_Definition:
Number of adult (2+ years old) black brant counted per observer-flock.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1
Range_Domain_Maximum: 4557
Attribute:
Attribute_Label: njuvs
Attribute_Definition:
Number of juvenile (hatched in year of survey) black brant counted per observer-flock.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0
Range_Domain_Maximum: 1154
Attribute:
Attribute_Label: ntotal
Attribute_Definition:
Number of total black brant (njuvs+nadults) counted per observer-flock.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 3
Range_Domain_Maximum: 4628
Attribute:
Attribute_Label: tide
Attribute_Definition: Tidal stage at time of survey.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: high
Enumerated_Domain_Value_Definition: High tide
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: high falling
Enumerated_Domain_Value_Definition: High tide, post peak
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: low
Enumerated_Domain_Value_Definition: Low tide
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: mid
Enumerated_Domain_Value_Definition: Mid tide
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: falling
Enumerated_Domain_Value_Definition: Falling tide
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: high rising
Enumerated_Domain_Value_Definition: High tide, prior to peak
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: NA
Enumerated_Domain_Value_Definition: Not recorded
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute:
Attribute_Label: observer
Attribute_Definition: Name or initials of observer who recorded data for that survey
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain: Name or initials of observer
Attribute:
Attribute_Label: location
Attribute_Definition: Abreviated Name for survey location in and around Izembek NWR
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Appg
Enumerated_Domain_Value_Definition: Applegate Cove (approximately 55.237N, 162.862W)
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: HwQP
Enumerated_Domain_Value_Definition: Half-round and Quarter points (approximately 55.289N, 162.816W)
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: OMRI
Enumerated_Domain_Value_Definition: Outermarker and Round Island (approximately 55.317N, 162.792W)
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: OpGz
Enumerated_Domain_Value_Definition:
Operl Island and Glaznap Point (approximately 55.423N, 162.641W)
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Morz
Enumerated_Domain_Value_Definition: Morzhovoi Bay (approximately 55.082N, 163.160W)
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: GPt
Enumerated_Domain_Value_Definition: Grant Point (approximately 55.271N, 162.894W)
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: BPNI
Enumerated_Domain_Value_Definition:
Blaine Point and Newmann Island (approximately 55.435N, 162.599W)
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: NB
Enumerated_Domain_Value_Definition: Norma Bay (approximately 55.183N, 163.035W)
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Moff
Enumerated_Domain_Value_Definition: Moffet Bay (approximately 55.381N, 162.555W)
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Kinz
Enumerated_Domain_Value_Definition: Kinzarof Lagoon (approximately 55.295N, 162.641W)
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute:
Attribute_Label: vantage
Attribute_Definition: Whether a survey was conducted from land or by boat
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: offshore
Enumerated_Domain_Value_Definition: Surveyed from boat
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: land
Enumerated_Domain_Value_Definition: Surveyed from land
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: NA
Enumerated_Domain_Value_Definition: Not recorded
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute:
Attribute_Label: tod
Attribute_Definition: Time of Day (minutes after midnight)
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 420
Range_Domain_Maximum: 1260
Attribute_Units_of_Measure: Minutes
Attribute:
Attribute_Label: doy
Attribute_Definition: Day of Year
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 236
Range_Domain_Maximum: 336
Attribute_Units_of_Measure: Days
Attribute:
Attribute_Label: disttoflock
Attribute_Definition: Distance between the observer and the flock
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 75
Range_Domain_Maximum: 900
Attribute_Units_of_Measure: Meters
Attribute:
Attribute_Label: behavior
Attribute_Definition: Behavior of the flock at the time of the survey
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: feeding
Enumerated_Domain_Value_Definition: feeding
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: resting
Enumerated_Domain_Value_Definition: resting
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: swimming
Enumerated_Domain_Value_Definition: swimming
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: swimming/resting
Enumerated_Domain_Value_Definition: swimming/resting
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: feeding/swimming
Enumerated_Domain_Value_Definition: feeding/swimming
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: gritting
Enumerated_Domain_Value_Definition: gritting
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: feeding/resting
Enumerated_Domain_Value_Definition: feeding/resting
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: preening
Enumerated_Domain_Value_Definition: preening
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: feeding/preening
Enumerated_Domain_Value_Definition: feeding/preening
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: NA
Enumerated_Domain_Value_Definition: Not recorded
Enumerated_Domain_Value_Definition_Source: Author defined
Attribute:
Attribute_Label: comments
Attribute_Definition:
Observations on weather, flushing birds, flock identification, or other factors. Note: rows that state 'same flock' and reference a position (e.g., same flock as above may not be referencing that specific flock. We assigned flkID based on comments, but order of rows may have changed. Blank cells denote missing data.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Unrepresentable_Domain: Observer notes
Detailed_Description:
Entity_Type:
Entity_Type_Label: blackBrant_fallAgeRatioModelEstimate_izembekNWR_amundson
Entity_Type_Definition:
Table with model-based estimates of age ratios by year along with SE, and 95% Bayesian credible intervals around estimates. Presented in a Comma Separated Value (CSV) formatted table.
Entity_Type_Definition_Source: Author defined
Attribute:
Attribute_Label: year
Attribute_Definition: Survey year
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1963
Range_Domain_Maximum: 2019
Attribute_Units_of_Measure: Year (YYYY)
Attribute:
Attribute_Label: ageratio
Attribute_Definition:
Numerical model-based age ratio estimates (number of juvenile birds: total number of birds) for each year of the survey
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.048012246
Range_Domain_Maximum: 0.480158777
Attribute:
Attribute_Label: SE
Attribute_Definition: Numerical standard error for age ratio estimate.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.004640142
Range_Domain_Maximum: 0.041544601
Attribute:
Attribute_Label: LCI95
Attribute_Definition:
Numerical lower 95% Bayesian credible interval (2.5 percent quantile) for model based age ratio estimates.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.039468042
Range_Domain_Maximum: 0.438700532
Attribute:
Attribute_Label: UCI95
Attribute_Definition:
Numerical upper 95% Bayesian credible interval (97.5% quantile) for model based age ratio estimates.
Attribute_Definition_Source: Author defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.057780768
Range_Domain_Maximum: 0.521686556
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey, Alaska Science Center
Contact_Address:
Address_Type: Mailing and Physical
Address: 4210 University Drive
City: Anchorage
State_or_Province: Alaska
Postal_Code: 99508
Country: USA
Contact_Voice_Telephone: 907-786-7000
Contact_Electronic_Mail_Address: ascweb@usgs.gov
Resource_Description:
The USGS Alaska Science Center is the authoritative source and distributor of these data.
Distribution_Liability:
Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey, no warranty expressed or implied is made regarding the display or utility of the data for other purposes or on all computer systems, nor shall the act of distribution constitute any such warranty. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: Zip
Format_Version_Number: 19.0
Format_Information_Content:
Zip file containing the data in CSV file format and FGDC metadata in XML and HTML formats.
File_Decompression_Technique: Winzip legacy compression applied
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: https://doi.org/10.5066/P9QIJIU2
Fees: None
Metadata_Reference_Information:
Metadata_Date: 20200302
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey, Alaska Science Center
Contact_Address:
Address_Type: Mailing and Physical
Address: 4210 University Drive
City: Anchorage
State_or_Province: Alaska
Postal_Code: 99508
Country: USA
Contact_Voice_Telephone: 907-786-7000
Contact_Electronic_Mail_Address: ascweb@usgs.gov
Metadata_Standard_Name:
FGDC Biological Data Profile of the Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001.1-1999

Generated by mp version 2.9.50 on Mon Mar 2 11:15:44 2020