Testosterone Levels in Blackbirds

Experimental manipulation of testosterone levels in male Red-winged Blackbirds (Agelaius phoeniceus) and resulting changes in antibody levels

Usage

Blackbirds

Format

A data frame with 13 observations on the following 6 variables.

before: a numeric vector
after: a numeric vector
log.before: a numeric vector
log.after: a numeric vector
diff.in.logs: a numeric vector
diff: a numeric vector

Source

Hasselquist, D., J.A. Marsh, P.W. Sherman, and J.C. Wingfield. 1999. Is avian immunocompetence suppressed by testosterone? Behavioral Ecology and Sociobiology 45: 167-175.

Examples


Blackbirds
#>    before after log.before log.after diff.in.logs diff
#> 1     105    85       4.65      4.44         0.21   20
#> 2      50    74       3.91      4.30        -0.39  -24
#> 3     136   145       4.91      4.98        -0.07   -9
#> 4      90    86       4.50      4.45         0.05    4
#> 5     122   148       4.80      5.00        -0.20  -26
#> 6     132   148       4.88      5.00        -0.12  -16
#> 7     131   150       4.88      5.01        -0.13  -19
#> 8     119   142       4.78      4.96        -0.18  -23
#> 9     145   151       4.98      5.02        -0.04   -6
#> 10    130   113       4.87      4.73         0.14   17
#> 11    116   118       4.75      4.77        -0.02   -2
#> 12    110    99       4.70      4.60         0.10   11
#> 13    138   150       4.93      5.01        -0.08  -12
xyplot(log.after ~ log.before, data = Blackbirds,
  ylab = "log Antibody production after implant",
  xlab = "log Antibody production before implant"
)