Five species of warblers were studied to determine the factors controlling the species abundances and competition (MacArthur 1958).
A list with 3 elements:
xtab is a list of sample x species matrices
sec_prc: percentages of total number of seconds of observations,
num_prc: percentages of total number of observations in seconds,
sec_cnt: counts based on percentages and totals of seconds,
num_cnt: counts based on percentages and totals),
samp is a data frame with sample level attributes such as height
(6 is the base, 1 is the top of trees, most trees were 50–60 feet tall)
and depth of branches in the canopy
(B: bare or lichen- covered base, M: middle zone of old needles,
T: terminal zone of new, less than 1.5 years old, needles or buds) ,
taxa is a data frame with scientific and common names for the species.
MacArthur, R. H., 1958. Population ecology of some warblers of northeastern coniferous forests. Ecology 39:599–619. <doi:10.2307/1931600>
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data(warblers) str(warblers) warbh <- mefa4::groupSums(warblers$xtab$num_cnt, 1, warblers$samp$height) warbd <- mefa4::groupSums(warblers$xtab$num_cnt, 1, warblers$samp$depth) op <- par(mfrow=c(1,2)) matplot(rownames(warbh), warbh, type="b", xlab="height") matplot(warbd, type="b", axes=FALSE, xlab="depth") box() axis(2) axis(1, 1:3, rownames(warbd)) par(op)
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