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

Description

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

Topic(s)

• Stock-Recruit
• Recruitment

Note

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

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.

Examples

data(PikeWindermere)
str(PikeWindermere)
head(PikeWindermere)
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)