This is a data set from Mazerolle et al. (2014) on the occupancy of
Bullfrogs (Lithobates catesbeianus) in 50 wetlands sampled in
2009 in the area of Montreal, QC.
Usage
data(bullfrog)
Format
A data frame with 50 observations on the following 23 variables.
Location
a factor with a unique identifier for each
wetland.
Reed.presence
a binary variable, either 1 (reed
present) or 0 (reed absent).
V1
a binary variable for detection (1) or non
detection (0) of bullfrogs during the first survey.
V2
a binary variable for detection (1) or non
detection (0) of bullfrogs during the second survey.
V3
a binary variable for detection (1) or non
detection (0) of bullfrogs during the third survey.
V4
a binary variable for detection (1) or non
detection (0) of bullfrogs during the fourth survey.
V5
a binary variable for detection (1) or non
detection (0) of bullfrogs during the fifth survey.
V6
a binary variable for detection (1) or non
detection (0) of bullfrogs during the sixth survey.
V7
a binary variable for detection (1) or non
detection (0) of bullfrogs during the seventh survey.
Effort1
a numeric variable for the centered
number of sampling stations during the first survey.
Effort2
a numeric variable for the centered
number of sampling stations during the second survey.
Effort3
a numeric variable for the centered
number of sampling stations during the third survey.
Effort4
a numeric variable for the centered
number of sampling stations during the fourth survey.
Effort5
a numeric variable for the centered
number of sampling stations during the fifth survey.
Effort6
a numeric variable for the centered
number of sampling stations during the sixth survey.
Effort7
a numeric variable for the centered
number of sampling stations during the seventh survey.
Type1
a binary variable to identify the survey type,
either minnow trap (1) or call survey (0) during the first
sampling occasion.
Type2
a binary variable to identify the survey type,
either minnow trap (1) or call survey (0) during the second
sampling occasion.
Type3
a binary variable to identify the survey type,
either minnow trap (1) or call survey (0) during the third
sampling occasion.
Type4
a binary variable to identify the survey type,
either minnow trap (1) or call survey (0) during the fourth
sampling occasion.
Type5
a binary variable to identify the survey type,
either minnow trap (1) or call survey (0) during the fifth
sampling occasion.
Type6
a binary variable to identify the survey type,
either minnow trap (1) or call survey (0) during the sixth
sampling occasion.
Type7
a binary variable to identify the survey type,
either minnow trap (1) or call survey (0) during the seventh
sampling occasion.
Details
This data set is used to illustrate single-species single-season
occupancy models (MacKenzie et al. 2002) in Mazerolle (2015).
Source
MacKenzie, D. I., Nichols, J. D., Lachman, G. B., Droege, S., Royle,
J. A., Langtimm, C. A. (2002). Estimating site occupancy rates when
detection probabilities are less than one. Ecology83,
2248–2255.
Mazerolle, M. J., Perez, A., Brisson, J. (2014) Common reed
(Phragmites australis) invasion and amphibian distribution in
freshwater wetlands. Wetlands Ecology and Management22,
325–340.
Mazerolle, M. J. (2015) Estimating detectability and biological
parameters of interest with the use of the R
environment. Journal of Herpetology49, 541–559.
Examples
data(bullfrog)
str(bullfrog)
Results
R version 3.3.1 (2016-06-21) -- "Bug in Your Hair"
Copyright (C) 2016 The R Foundation for Statistical Computing
Platform: x86_64-pc-linux-gnu (64-bit)
R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.
R is a collaborative project with many contributors.
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.
Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.
> library(AICcmodavg)
> png(filename="/home/ddbj/snapshot/RGM3/R_CC/result/AICcmodavg/bullfrog.Rd_%03d_medium.png", width=480, height=480)
> ### Name: bullfrog
> ### Title: Bullfrog Occupancy and Common Reed Invasion
> ### Aliases: bullfrog
> ### Keywords: datasets
>
> ### ** Examples
>
> data(bullfrog)
> str(bullfrog)
'data.frame': 50 obs. of 23 variables:
$ Location : Factor w/ 50 levels "Arbo_Mc_gill",..: 1 2 3 4 5 6 7 8 9 10 ...
$ Reed.presence: int 0 1 1 1 0 1 1 1 1 1 ...
$ V1 : int 0 0 0 0 0 0 0 0 0 0 ...
$ V2 : int 0 0 0 NA 0 0 0 0 0 NA ...
$ V3 : int 0 0 0 NA 0 0 0 0 0 NA ...
$ V4 : int 0 0 0 0 0 1 1 1 0 1 ...
$ V5 : int 0 0 0 NA 0 0 0 0 0 0 ...
$ V6 : int 0 0 0 NA 0 0 0 0 0 0 ...
$ V7 : int 0 0 0 0 0 0 0 0 0 0 ...
$ Effort1 : num 1.334 -0.666 -0.666 -4.666 2.334 ...
$ Effort2 : num 1.334 -0.666 -0.666 -8.666 2.334 ...
$ Effort3 : num 1.334 -0.666 -0.666 -8.666 2.334 ...
$ Effort4 : num 1.334 -0.666 -0.666 -4.666 2.334 ...
$ Effort5 : num 0.334 -0.666 -0.666 -8.666 2.334 ...
$ Effort6 : num 0.334 -0.666 -0.666 -8.666 2.334 ...
$ Effort7 : num 1.334 -0.666 -0.666 -4.666 2.334 ...
$ Type1 : int 0 0 0 0 0 0 0 0 0 0 ...
$ Type2 : int 1 1 1 1 1 1 1 1 1 1 ...
$ Type3 : int 1 1 1 1 1 1 1 1 1 1 ...
$ Type4 : int 0 0 0 0 0 0 0 0 0 0 ...
$ Type5 : int 1 1 1 1 1 1 1 1 1 1 ...
$ Type6 : int 1 1 1 1 1 1 1 1 1 1 ...
$ Type7 : int 0 0 0 0 0 0 0 0 0 0 ...
>
>
>
>
>
> dev.off()
null device
1
>