ex1125 {Sleuth3}

Ingestion Rates of Deposit Feeders

Description

The data are the typical dry weight in mg, the typical ingestion rate (weight of food intake per day for one animal) in mg/day, and the percentage of the food that is composed of organic matter for 22 species of deposit feeders. The goal is to see whether the distribution of species' ingestion rates depends on the percentage of organic matter in the food, after accounting for the effect of species weight and to describe the association. The last three species happen to be Bivalves, so may behave differently from the others.

Usage

ex1125

Format

A data frame with 22 observations on the following 5 variables.

Species

a character variable with the name of the species

Weight

the dry weight of the species, in mg

Ingestion

ingestion rate in mg per day

Organic

percentage of organic matter in the food

Bivalve

a factor with levels "no" and "yes" to indicate whether a species is a bivalve

Source

Ramsey, F.L. and Schafer, D.W. (2013). The Statistical Sleuth: A Course in Methods of Data Analysis (3rd ed), Cengage Learning.

References

Cammen, L. M. (1980) Ingestion Rate: An Empirical Model for Aquatic Deposit Feeders and Detritivores, Oecologia 44: 303–310.

See Also

ex0921

Examples

str(ex1125)