AICcmodavg (version 2.3-1)

bullfrog: Bullfrog Occupancy and Common Reed Invasion

Description

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).

Examples

data(bullfrog)
str(bullfrog)