CompositeIndices: Compile index estimates for Pacific Flyway data book

In USFWS/AKaerial: Analysis of Alaska Region Aerial Survey Data

Compile index estimates for Pacific Flyway data book

Description

CompositeIndices compiles appropriate estimates from multiple surveys for Taverner's geese, Pacific whitefronts, mid-continent whitefronts, western tundra and Pacific coast trumpeter swans, and lesser Canada geese.

Usage

CompositeIndices(
  tavs.year = c(1985:2024),
  pw.year = c(1985:2024),
  tusw.year = c(1985:2024),
  lesser.year = c(1964:2024),
  mcw.year = c(1964:2024),
  trsw.year = c(1964:2024),
  versioning = FALSE
)

Arguments

tavs.year	range of years for the Taverner's geese composite table, defaults to 1985-2022
pw.year	range of years for the Pacific white-fronted goose composite table, defaults to 1985-2022
tusw.year	range of years for the western tundra swan composite table, defaults to 1985-2022
lesser.year	range of years for the lesser Canada goose composite table, defaults to 1964-2022
mcw.year	range of years for the mid-continent white-fronted goose composite table, defaults to 1964-2022
trsw.year	range of years for the Pacific coast trumpeter swan composite table, defaults to 1964-2022
versioning	TRUE/FALSE should the time stamp of the data tables used be included with the composite table?

Details

USFWS-MBM-Alaska Region surveys are used in harvest management decisions by the Pacific Flyway. Although management plans generally use a single survey index to decide appropriate management actions, 6 species require a composite index across 2 or more Alaska Region surveys. These species and their composite indices are:

1. Taverner's geese (TAVS) - All strata from the Arctic Coastal Plain (ACPHistoric), CCGO in the "low" stratum or at latitudes > 63 on the Yukon-Kuskokwim Delta (YKGHistoric), strata 10, 11, and 99 (clipped section of 9) on the WBPHS (WBPHSHistoric)

2. Pacific white-fronted geese - GWFG on the Yukon-Kuskokwim Delta (YKGHistoric) or in strata 8 or 99 on the WBPHS (WBPHSHistoric)

3. Western tundra swans (TUSW) - TUSW or SWAN on the Yukon-Kuskokwim Delta (YKGHistoric) or in strata 8, 99, 10, or 11 on the WBPHS (WBPHSHistoric)

4. Lesser Canada geese - CCGO in strata 1, 2, 3, 4, or 12 on the WBPHS (WBPHSHistoric)

5. Mid-continent white-fronted geese - GWFG in strata 3, 4, 5, 6, 10, or 11 on the WBPHS (WBPHSHistoric) and all GWFG on the Arctic Coastal Plain (ACPHistoric)

6. Pacific coast trumpeter swans (TRSW) - TRSW or SWAN in strata 1, 2, 3, 4, 6, or 7 on the WBPHS (WBPHSHistoric)

Note that WBPHS stratum 9 is clipped and renamed 99 to avoid double counting birds in an area surveyed on the Yukon-Kuskokwim Delta surveys. The default range of years for each species is set to the earliest year in which all surveys that make up the index were conducted.

Value

Six .csv files are written to the current working directory (1 for each species) and optionally a .csv of the current version of the data files used

Author(s)

Charles Frost, [e-mail]

References

https://github.com/USFWS/AKaerial

USFWS/AKaerial documentation built on April 3, 2025, 4:06 p.m.