BrookTrout {abd} | R Documentation |

## Salmon Survival in the Presence of Brook Trout

### Description

Total numbers of salmon released (`salmon.released`

) and surviving
(`salmon.surviving`

) in 12 streams, 6 with brook trout `present`

and 6 with brook trout `absent`

. The proportion of salmon surviving
(`proportion.surviving`

) is given for each stream.

### Format

`BrookTrout`

is a data frame with 12 observations on the
following 4 variables. `BrookTrout2`

is a different summary of the
same study and gives survival rates for chinook in different years.

- trout
a factor with levels

`absent`

and`present`

indicating whether brook trout are absent or present in the stream- salmon.released
a numeric vector of the total number of salmon released

- salmon.surviving
a numeric vector of the number of salmon surviving

- proportion.surviving
a numeric vector of the proportion of salmon surviving

### Source

Levin, P.S., S. Achord, B.E. Fiest, and R.W. Zabel. 2002.
Non-indigenous brook trout and the demise of Pacific salmon: a forgotten
threat? *Proceedings of the Royal Society of London, Series B,
Biological Sciences* 269: 1663-1670.

### Examples

```
str(BrookTrout)
str(BrookTrout2)
bwplot(proportion.surviving ~ trout, BrookTrout)
aggregate(proportion.surviving ~ trout, BrookTrout, FUN = favstats)
summary(proportion.surviving ~ trout, BrookTrout, fun = favstats)
```

*abd*version 0.2-8 Index]