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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