Stock and recruitment data for Northern Pike from Lake Windermere, 1944-1981.

Stock and recruitment data for Northern Pike (Esox lucius) from Lake Windermere, 1944-1981.

Format

A data frame of 75 observations on the following two variables:

year

Year

stock

Female biomass (kg)

recruits

Number at age-2

basin

Basin of Windermere (North or South)

tdd14

Temperature degree-days over 14C

Source

From table 3 in Kipling, C. 1983. Changes in the population of pike (Esox lucius) in Windermere from 1944 to 1981. Journal of Animal Ecology 52:989-999. CSV file

Note

Stock values were originally reported in 1000s of kgs and recruits were originally recorded in tens of numbers. Thus, plots look very discrete.

Topic(s)

• Stock-Recruit

• Recruitment

Examples

data(PikeWindermere)
str(PikeWindermere)
#> 'data.frame':	76 obs. of  5 variables:
#>  $ year    : int  1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 ...
#>  $ stock   : int  2200 1100 800 800 700 1000 1100 1100 900 700 ...
#>  $ recruits: int  370 310 300 910 340 680 360 500 430 290 ...
#>  $ basin   : Factor w/ 2 levels "North","South": 1 1 1 1 1 1 1 1 1 1 ...
#>  $ tdd14   : int  232 296 131 426 159 435 256 279 285 357 ...
head(PikeWindermere)
#>   year stock recruits basin tdd14
#> 1 1944  2200      370 North   232
#> 2 1945  1100      310 North   296
#> 3 1946   800      300 North   131
#> 4 1947   800      910 North   426
#> 5 1948   700      340 North   159
#> 6 1949  1000      680 North   435
op <- par(mfrow=c(2,2),pch=19)
plot(recruits~year,data=PikeWindermere,subset=basin=="North",main="North")
plot(recruits~stock,data=PikeWindermere,subset=basin=="North",main="North")
plot(recruits~year,data=PikeWindermere,subset=basin=="South",main="South")
plot(recruits~stock,data=PikeWindermere,subset=basin=="South",main="South")

par(op)