Salmon Survival in the Presence of Brook Trout

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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.

Usage

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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

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data(BrookTrout)
data(BrookTrout2)
str(BrookTrout)
str(BrookTrout2)

bwplot(proportion.surviving ~ trout, BrookTrout)

aggregate( proportion.surviving ~ trout, BrookTrout, FUN = favstats)

if (require(Hmisc)) {
  summary( proportion.surviving ~ trout, BrookTrout, fun = favstats)
}

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