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Table 3 Results of inter-observer agreement test on wolf recognition. A selection of 40 videos was used for the tests. The number of capture events attributed by operators to a different wolf pack are reported

From: Estimation of pack density in grey wolf (Canis lupus) by applying spatially explicit capture-recapture models to camera trap data supported by genetic monitoring

 

Operator 1

Operator 2

Operator 3

Operator 4

PS -Poti South pack

5

9

8

8

MF - Monte Favalto pack

5

0

0

0

PNE –Poti North East pack

4

4

4

4

PN – Poti North pack

4

4

4

4

LG - Monte Lignano pack

2

2

2

0

VC –Val di Chio pack

2

2

2

3

CS –Catenaia South pack

2

2

2

2

CN –Catenaia North pack

2

2

2

2

VE –Vallesanta East pack

4

4

4

4

AT - Alto Tevere pack

1

1

1

1

Indeterminate

9

10

11

12

Total CE

40

40

40

40

Different Packs identified

10

9

9

8

Capture histories (nr. of CE assigned to a pack)

31

30

29

28

Matches with operator 1 (%)

 

34 (85.0)

34 (85.0)

32 (80.0)

Matches with operator 2 (%)

  

39 (97.5)

36 (90.0)

Matches with operator 3 (%)

   

37 (92.5)

Pack density (SD) estimated from full capture histories(model SPACECAP HN_TP)

1.56 (0.45)

1.14 (0.33)

1.17 (0.35)

1.01 (0.32)

Pack density (SD) estimated from only concordant capture histories(model SPACECAP HN_TP)

 

1.48 (0.47)

1.49 (0.46)

1.31 (0.44)

  1. Operator 1 was experienced researcher contributing to study design and camera-trapping. Operators 2 and 3 were experienced field assistants in camera trapping, while operator 4 was inexperienced. Discrepancies among operators were solved by NGS data and confirmed the interpretation of operator 1. Hence, capture histories provided by operator 1 were used for model analysis. CE, capture event