PCB {asbio}

PCBs and herring egg thickness

Description

Thirteen sites in the Great Lakes were selected for a study to quantify PCB concentrations in 1982 and 1996 (Hughes et al. 1998). At each site 9-13 American herring gull (Larus smithsonianus) eggs were randomly collected and tested for PCB content.

Usage

data(PCB)

Format

A data frame with 26 observations on the following 3 variables.

nest

Nest number

level

PCB levels microgram/gram of dry weight

year

a numeric vector

Source

Ott, R. L., and M. T. Longnecker (2004) A First Course in Statistical Methods. Thompson.

References

Hughes, K. D., Weselogh, D. V., and B. M. Braune (1998) The ratio of DDE to PCB concentrations in Great Lakes herring gull eggs and its use in interpreting contaminants data. Journal of Great Lakes Research 24(1): 12-31.