bythotrephes: Bythotrephes Functional Response Data

In frair: Tools for Functional Response Analysis

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
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 and total experimental time was 12 hours. Provides a example dataset for type-III and flexible exponent models.

Source

Daniel Barrios-O'Neill.

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)))

Example output

Loading required package: stats4
Loading required package: bbmle
'data.frame':	72 obs. of  4 variables:
 $ density: int  1 1 1 3 3 3 2 2 2 4 ...
 $ eaten  : int  1 1 0 3 2 3 2 2 2 4 ...
 $ alive  : int  0 0 1 0 1 0 0 0 0 0 ...
 $ size   : Factor w/ 3 levels "small","medium",..: 3 3 3 3 3 3 3 3 3 3 ...

frair documentation built on May 2, 2019, 8:17 a.m.