Description Usage Format Details Source References See Also Examples
Relative abundances of tree species for the forest plots described in E. Lucy Brauns (1950) book, Deciduous Forests of Eastern North America, as communicated by Ricklefs (2018).
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A list of 2 data.frames:
- spe
347 observations of 122 woody plant species,
- env
347 observations of 33 environmental variables.
Species matrix values are relative abundances of tree
species in 347 plots (removing one of Ricklefs which had no
species abundance information). Species names follow Ricklefs
Table 3; those beginning with X_
indicate that no
species name was provided.
Environmental matrix values include plot names, bibliographic
information, location information and WorldClim climate values
per Ricklefs (2018).
Ricklefs (2018).
Braun, E. L. 1950. Deciduous Forests of Eastern North America. Hafner, New York.
Ricklefs, R. E. 2018. Emma Lucy Brauns forest plots in eastern North America. Ecology 99(2):504.
https://en.wikipedia.org/wiki/Emma_Lucy_Braun
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 | # split into two data.frames
data(braun)
spe <- braun$spe
env <- braun$env
# describe the species abundance matrix
mx_diversity(spe) # high beta-diversity
# remove rare species and depauperate plots
rare <- (colSums((spe>0)*1) < 5)
poor <- (rowSums((spe>0)*1) < 3)
spe <- spe[!poor, !rare]
env <- env[!poor, ]
mx_diversity(spe)
mx_valid(spe)
# visualize the species abundance matrix
plot_heatmap(spe, logbase=10, labcex=0.5, yexp=1.3)
# gradient analysis (ordination)
m <- vegan::metaMDS(spe, 'bray') # tune for real usage!
s <- vegan::scores(m)
set_par(4, pch=16)
plot(s, col=colvec(env$bio3), main='Isothermality')
plot(s, col=colvec(env$bio1), main='Mean Ann Temp')
plot(env$lon, env$lat, col='#00000030', main='Plots')
plot(env$lon, env$lat, col=colvec(s[,1]), main='NMS1 scores')
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