Linking Wildbook and marked via RWildbook

Simon Bonner

2016-12-27

Here we show how data retrieved from a Wildbook database can be formatted and analysed using the marked package by Jeff Laake (also the creator of the RMark package). In particular, we fit a simple Cormack-Jolly-Seber model to data retrieved from whaleshark.org.

First we load the RWildbook and marked package:

## Load other packages
library(RWildbook)
## Loading required package: jsonlite
## Loading required package: data.table
library(marked)
## Loading required package: lme4
## Loading required package: Matrix
## Loading required package: parallel
## This is marked 1.1.11

Next we use the searchWB() function from RWildbook to retrieve data for the first 99 whale sharks:

## Extract data for individual A-001 through A-099
vignette_2_data <- searchWB(username="username",
                            password="password",
                            baseURL ="whaleshark.org",
                            object="Encounter",
                            individualID=paste0("A-0",rep(0:9,rep(10,10)),rep(0:9,10))[-1])

This results in the following data frame (not the that the time of encounter has been modified to maintain data privacy):

data("vignette_2_data",package="RWildbook")
head(vignette_2_data)[,c("individualID","location","year","month","day")]
##   individualID                                        location year month
## 1        A-098                Ningaloo Marine Park (Coral Bay) 2003    11
## 2        A-052 Exmouth Gulf, Back of Reef in Bundegi Sanctuary 2005    11
## 3        A-013                                  North Ningaloo 2014    11
## 4        A-003                      north ningaloo marine park 2011     5
## 5        A-079                                  North Ningaloo 2013     6
## 6        A-063                  coral bay ningaloo marine park 2011     7
##   day
## 1  10
## 2  13
## 3  16
## 4  13
## 5   6
## 6   7

Now we can create capture histories by defining the start and end times of the capture occasions. For illustration, we assume that the capture occasions cover January, February, and March of each year from 1998 through 2016.

 ## Define start and end dates of capture occasions
 start.dates1 <- paste0(1998:2016,"-01-01") #Define the start.date value
 end.dates1 <- paste0(1998:2016,"-04-01") #Define the end.date value

 ## Format data for use in marked
 markedData1 <- markedData(data = vignette_2_data,
                              varname_of_capturetime = "dateInMilliseconds",
                              varlist = c("individualID"),
                              start.dates = start.dates1,
                              end.dates = NULL,
                              date_format = "%Y-%m-%d",
                              origin = "1970-01-01")
## Note: Removing 25 individuals with no observed captures.

We can now fit the Cormack-Jolly-Seber model using the functions in mark to first format the data:

 ## Fit simple CJS model in marked
 markedData1.proc=process.data(markedData1,model="cjs",begin.time=1)
## 74 capture histories collapsed into 74
 markedData1.ddl=make.design.data(markedData1.proc)
 markedData1.cjs=crm(markedData1.proc,markedData1.ddl,model.parameters=list(Phi=list(formula=~time),p=list(formula=~time)))
## Fitting model
## Computing initial parameter estimates
## Accumulating capture histories based on design. This can take awhile...
## 74 capture histories collapsed into 51
## Starting optimization for 36 parameters...
## 
 Number of evaluations:  100  -2lnl: 661.4810565
 Number of evaluations:  200  -2lnl: 657.6593186
 Number of evaluations:  300  -2lnl:  654.738069
 Number of evaluations:  400  -2lnl: 654.2391281
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## Elapsed time in minutes:  0.0497

and plot the estimated capture and survival probabilities:

## Plot parameter estimates
plot(1998:2015,markedData1.cjs$results$reals$Phi$estimate,
        pch=16,col="green",
        main="Estimated Capture and Survival Probabilities",
        xlab="Occasion",ylab="Estimate",ylim=c(0,1))
points(1999:2016,markedData1.cjs$results$reals$p$estimate,pch=16,col="blue")
legend("bottomright",pch=16,col=c("green","blue"),legend=c("Survival","Capture"))