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Size measurements for penguins near Palmer Station, Antarctica

Source: R/datasets.R
peng.Rd

Data originally from palmerpenguins. Includes measurements for penguin species, island in Palmer Archipelago, size (flipper length, body mass, bill dimensions), and sex.

Usage

peng

Format

A tibble with 333 rows and 8 variables:

species

a factor denoting penguin species ("Adélie", "Chinstrap" or "Gentoo")

island

a factor denoting island in Palmer Archipelago, Antarctica ("Biscoe", "Dream" or "Torgersen")

bill_length

a number denoting bill length (millimeters)

bill_depth

a number denoting bill depth (millimeters)

flipper_length

an integer denoting flipper length (millimeters)

body_mass

an integer denoting body mass (grams)

sex

a factor denoting penguin sex ("f", "m")

year

an integer denoting the study year (2007, 2008, or 2009)

Source

Adélie penguins: Palmer Station Antarctica LTER and K. Gorman. 2020. Structural size measurements and isotopic signatures of foraging among adult male and female Adélie penguins (Pygoscelis adeliae) nesting along the Palmer Archipelago near Palmer Station, 2007-2009 ver 5. Environmental Data Initiative doi:10.6073/pasta/98b16d7d563f265cb52372c8ca99e60f

Gentoo penguins: Palmer Station Antarctica LTER and K. Gorman. 2020. Structural size measurements and isotopic signatures of foraging among adult male and female Gentoo penguin (Pygoscelis papua) nesting along the Palmer Archipelago near Palmer Station, 2007-2009 ver 5. Environmental Data Initiative doi:10.6073/pasta/7fca67fb28d56ee2ffa3d9370ebda689

Chinstrap penguins: Palmer Station Antarctica LTER and K. Gorman. 2020. Structural size measurements and isotopic signatures of foraging among adult male and female Chinstrap penguin (Pygoscelis antarcticus) nesting along the Palmer Archipelago near Palmer Station, 2007-2009 ver 6. Environmental Data Initiative doi:10.6073/pasta/c14dfcfada8ea13a17536e73eb6fbe9e

Originally published in: Gorman K.B., Williams T.D., Fraser W.R. (2014) Ecological Sexual Dimorphism and Environmental Variability within a Community of Antarctic Penguins (Genus Pygoscelis). PLoS ONE 9(3): e90081. doi:10.1371/journal.pone.0090081

Details

In this version, variable names have been shortened (removing units) and observations with missing data have been removed.

Examples

data(peng)
# Covariance ellipses, centered, first two variables
covEllipses(cbind(bill_length, bill_depth) ~ species, data=peng,
     center=TRUE, 
     fill=c(rep(FALSE,3), TRUE), 
     fill.alpha=.1, label.pos=c(1:3,0))


# All pairs when more than two variables are specified. They look pretty similar
covEllipses(peng[,3:6], peng$species, 
            variables=1:4, 
            fill=c(rep(FALSE,3), TRUE), 
            fill.alpha=.1)

            
# Box's M test   
peng.boxm <- boxM(cbind(bill_length, bill_depth, flipper_length, body_mass) ~ species, data=peng)
peng.boxm
#> 
#> 	Box's M-test for Homogeneity of Covariance Matrices
#> 
#> data:  Y
#> Chi-Sq (approx.) = 74.731, df = 20, p-value = 3.02e-08
#> 
plot(peng.boxm, gplabel="Species")


# Fit MANOVA model, predicting species 
peng.mod0 <-lm(cbind(bill_length, bill_depth, flipper_length, body_mass) ~
               species, data=peng)
car::Anova(peng.mod0)
#> 
#> Type II MANOVA Tests: Pillai test statistic
#>         Df test stat approx F num Df den Df    Pr(>F)    
#> species  2    1.6379   370.89      8    656 < 2.2e-16 ***
#> ---
#> Signif. codes:  0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1

# HE plot
heplot(peng.mod0, fill=TRUE, fill.alpha=0.1, 
       size="effect",
       xlim=c(35,52), ylim=c(14,20))