Bythotrephes Functional Response Data

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Description

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

Usage

1

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
size: A factor with levels 'small', 'medium' and 'large'. The size of prey items.

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.

Source

Daniel Barrios-O'Neill.

Examples

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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)))