AItarget: Calculate Targets for the Adult Index

In JVAdams/GLFC: Great Lakes Fishery Commission

Calculate Targets for the Adult Index

Description

Calculate lake-wide targets for the Adult Index of sea lamprey populations in the Great Lakes from the mean of specified years.

Usage

AItarget(
  lakeIndex,
  years = list(1994:1998, 1995:1999, 1989:1993, 1991:1995, 1993:1997),
  adjust = c(1, 5/8.9, 0.25, 1, 1)
)

Arguments

lakeIndex	A data frame of annual lake-wide Adult Indices with at least these 3 columns: lake, year, and the Adult Index index.
years	A list of length 5 (for each Great Lake respectively: Superior, Michigan, Huron, Erie, and Ontario), each element an integer vector of length 5 specifying the 5 years during which there were acceptable sea lamprey wounding rates on lake trout, default list(1994:1998, 1995:1999, 1989:1993, 1991:1995, 1993:1997). These will be used to generate Adult Index targets.
adjust	A numeric vector of length 5 (for each Great Lake), specifying adjustments to be made to the calculated means to generate Adult Index targets, default c(1, 5/8.9, 0.25, 1, 1). Since Lake Huron did not have a time period with acceptable sea lamprey wounding rates, the target was set to 25% of the mean for 1989-1993.

Details

The Lake Michigan Committee accepted the Sea Lamprey Control Board's recommendation for an Adult Index target at its Executive Session, 22 March 2016. Specifically, the years of acceptable wounding used to define the Adult Index target for Lake Michigan sea lampreys was changed to a time period with available Adult Index data, 1995-1999, and the index target was defined as the mean of the Adult Index during these years, adjusted by 5/8.9 to compensate for the highest wounding rate observed during this period.

Value

A data frame with the calculated targets for the Adult Index of each Great Lake, with 2 columns: lake and targInd.

JVAdams/GLFC documentation built on Jan. 5, 2023, 12:59 a.m.