README

DATA COLLECTION
 Camera trap data were collected between September 2016 and May 2018 as part of a comprehensive biodiversity inventory (PNS-Survey©), along 378 systematically placed sample units (i.e. line transects) over 17,127 km2 of evergreen lowland rainforest of Salonga National Park (SNP), block South, Democratic Republic of the Congo. The 1 km transects running east-west were evenly spaced by 6 km. Two infrared camera traps (Bushnell Trophy CamTM, Model 119776), with angle of  view = 45° and inter-trigger lag time = 1 s, were set up at 250 m and 750 m from the beginning of each transect, resulting in 743  active camera trap locations. To avoid disturbance caused by the passage of field teams, cameras were  systematically positioned 50 m to the north or south of the transect line, oriented north between 70 and 90 cm above ground. Given the size of SNP and the limited number of devices (n = 160), the study area was divided into 37 sub-areas  covering 380 km2 on average (range = 72 – 1,188 km2, SD = 274.8), each surveyed once. CTs were relocated to a new sub-area after a minimum of two weeks (average = 38.4 days, range 14 – 78, SD = 12.4).   
UTM coordinates of camera traps are are available on request. Please contact the corresponding author, Mattia Bessone:

 M.Bessone@2018.ljmu.ac.uk 

METADATA
 A description of the column labels of the database is provided in the datasheet "Metadata", in the Excel database.

AVAILABILITY CALCULATION
 To improve precision of estimates, we extracted species-specific availability from available video footage using two methods 1) “ACa” (Cappelle et al., 2019) and 2) “ARo” (Rowcliffe et al., 2014).
Analysis were performed in "R", version 3.6.1.. Package "activity" version 1.3., was used for calculating species specific ARo (Rowcliffe et al., 2014). Data are provided in the "Availability" datasheets, in the Excel database.  

DENSITY CALCULATION
 We estimated density of 14 species by using Camera Trap Distance Sampling (Howe et al., 2017). Distance data were estracted from the videos following the protocols described by Howe et al. (2017) and Cappelle et al. (2019).
Data are provided in the species specific datasheets, in the Excel database. Analysis were performed in software "Distance", version 7.3 (Thomas et al., 2010).
Empty cells refer to active camera-traps with no observation of the species of interest along the whole survey period. 


ACCESS TO VIDEO-CLIPS USED IN THE STUDY
 The video-clips used in this study are available on request.
Please contact the corresponding author, Mattia Bessone:

 M.Bessone@2018.ljmu.ac.uk 


REFERENCES
 Cappelle, N., Després-Einspenner, M.L., Howe, E.J., Boesch, C. & Kühl, H.S. (2019) Validating camera trap distance sampling for chimpanzees. American Journal of Primatology, 81, e22962. https://doi.org/10.1002/ajp.22962
 Howe, E.J., Buckland, S.T., Després-Einspenner, M.L. & Kühl, H.S. (2017) Distance sampling with camera traps. Methods in Ecology and Evolution, 8, 1558-1565. https://doi.org/10.1111/2041-210X.12790
 Rowcliffe, J.M., Kays, R., Kranstauber, B., Carbone, C. & Jansen, P.A. (2014) Quantifying levels of animal activity using camera trap data. Methods in Ecology and Evolution, 5, 1170-1179. https://doi.org/10.1111/2041-210X.12278
 Thomas, L., Buckland, S.T., Rexstad, E.A., Laake, J.L., Strindberg, S., Hedley, S.L., Bishop, J.R., Marques, T.A. & Burnham, K.P. (2010) Distance software: design and analysis of distance sampling surveys for estimating population size. Journal of Applied Ecology, 47, 5-14.