frair (version 0.5)

bythotrephes: Bythotrephes Functional Response Data

Description

Functional response dataset for Bythotrephes spp. (water fleas) preying on prey items of different sizes.

Usage

data(bythotrephes)

Format

A dataframe with the following structure:

density:	An integer. The initial density of prey	eaten:
An integer. The number of prey eaten	alive:	An integer. The number of prey left alive

Source

Daniel Barrios-O'Neill.

Details

Bythotrephes spp. (water fleas) preying on prey items of different sizes. Prey were not replaced during the experiment. Provides a example dataset for type-III and flexible exponent models.

Examples

data(bythotrephes)
str(bythotrephes) 

with(bythotrephes, 
	plot(density, eaten, type='n', 
	xlab='Density', ylab='No. Prey Eaten'))
with(bythotrephes[bythotrephes$size=='large',], 
	points(density-0.2, eaten, pch=20, col=rgb(0.5,0,0,0.4)))
with(bythotrephes[bythotrephes$size=='medium',], 
	points(density, eaten, pch=20, col=rgb(0,0.5,0,0.4)))
with(bythotrephes[bythotrephes$size=='small',], 
	points(density+0.2, eaten, pch=20, col=rgb(0,0,0.5,0.4)))

legend(1,12, c('Large', 'Medium', 'Small'), pch=20, bty = 'n', 
    col=c(rgb(0.5,0,0), rgb(0,0.5,0), rgb(0,0,0.5)))