beetles: Population density growth of beetles

In datana: Datasets and Functions to Accompany Analisis De Datos Con R

Population density growth of beetles

Description

Temporal measurements of density of beetles (Tribolium confusum) growing in different controlled environments.

Usage

beetles

Format

days

Number of days.

diet

The quantities of flour (in grams) of the environments where the beetles were growing. Six levels of the factor Diet.

type

The various stage of beetles, i.e., eggs, larvae, pupae, and adults.

density

The number of insects per environment.

Source

Data from Table No. 1, page 116, of Chapman (1928). Series of experiments under controlled conditions in which flour beetles (Tribolium confusum) are kept in environments of known size. The period from egg to adult is approximately forty days at 27C degrees. The data were entered by Miss Yamara Arancibia, a former student of Prof. Christian Salas-Eljatib.

References

• Chapman RN. 1928. The quantitative analysis of environmental factors. Ecology 9(2):111-122. \Sexpr[results=rd]{tools:::Rd_expr_doi("10.2307/1929348")}

Examples

data(beetles)
table(beetles$type)
name.diet<-unique(beetles$diet)
num.diet<-length(name.diet)
##Time series plot
#first, some computation
alys<-with(beetles,tapply(density,list(as.factor(days),as.factor(diet)),sum))
out<-as.data.frame(alys)
out$time<-row.names(out)
head(out)
#Figure 1 of the paper
matplot(out[,"time"], out[,1:num.diet], las=1, type=c("b"),pch=1,
        xlab="Time in days",ylab="Total individuals")
legend("topleft", legend = name.diet, title = "Diet (gr)",
       col = 1:6, lty = 1:6, pch = 1)

datana documentation built on June 13, 2025, 1:11 a.m.