Arkansas {SiZer}

Time Series of Macroinvertabrates Abundance in the Arkansas River.

Description

A time series of 16 years (5 replicates per year) of mayfly (Ephemeroptera:Heptageniidae) abundance in the fall at the monitoring station AR1 on the Arkansas River in Colorado, USA.

Usage

data(Arkansas, package='SiZer')

Format

A data frame with 90 observations on the following 2 variables.

year

The year of observation

sqrt.mayflies

The Square root of observed abundance.

Source

Sonderegger, D.L., Wang, H., Clements, W.H., and Noon, B.R. 2009. Using SiZer to detect thresholds in ecological data. Frontiers in Ecology and the Environment 7:190-195.

Examples

require(ggplot2)

data(Arkansas)
ggplot(Arkansas, aes(x=year, y=sqrt.mayflies)) + 
   geom_point()