Date created: 08/03/2021 License: CC BY-SA 4.0 Datafile:Papworth population density of titi monkeys in Yasuni National Park.csv Contact: Sarah Papworth (sarah.papworth@rhul.ac.uk) Research project: 'Small scale human-primate behavioural interactions in Amazonian Ecuador': Interdisciplinary PhD studentship awarded to Sarah Papworth by Natural Environment Research Council and Economical and Social Research Council 2008-2012. Data collected in 2010 for a population census of Plecturocebus discolor (formerly Callicebus discolor) around Estación Científica Yasuní (ECY), Ecuador. Data used in PhD thesis (https://doi.org/10.25560/10616) and referenced in publication (https://doi.org/10.1896/044.021.0209). Data collection: Data were collected around Estación Científica Yasuní (ECY) in Yasuní National Park, north-east Ecuador (-0.67, -76.40). Playbacks of titi monkey loud choruses were conducted using the methods outlined in Dacier et al. (2011) Biotropica 43(2): 135-140 (https://doi.org/10.1111/j.1744-7429.2010.00749.x). A two minute duet was recorded using a Marantz PMD661 Professional Portable SD Field Recorder and Seinnheiser ME67 directional microphone. An anchor-audio PB-25 Minivox speaker was used to broadcast a playback consisting of 4 repeats of the duet. The call sequence was played back so that the loudest part was at 100dB when measured at 1 metre from the speaker with a CEM DT-85A dB meter. In October / November of 2010, this recording was played to 12 groups of red titi monkeys (six groups at ECY and six group at nearby Tiputini Biodiversity Station) at distances of 15 to 100 metres to determine response rate. Eight of the twelve groups responded. 68 playbacks of the stimulus were conducted in an area of approximately 8km2 at 250 – 500m intervals along the trail system at ECY between 08:00 and 17:00, during November and December 2010. The direction and distance of responses were recorded. Data collected by Sarah Papworth and Manuel Mejia. Analysis and results: Fuller details are presented in Papworth (2012) 'Small scale human-primate behavioural interactions in Amazonian Ecuador' (PhD thesis, https://doi.org/10.25560/10616). The program Distance 6.0 was used to estimate density, using the hazard-rate key function with two cosine adjustments. Observations were truncated at 400m, and distances were grouped in the same bins as used by Dacier et al. (2011). Population density was estimated as 8.7±SE1.4 groups per km2, with a 95% confidence interval of 6 – 12 groups. Dataset: If multiple groups responsed to a playback, each group was entered in the dataset as a separate line. Therefore there are 81 observations over 68 playbacks. Dataset has the following variables: Census point: Numerical, unique number for each playback, labelled in chronological order Latitude: Latitude of the playback in 1984-WGS Longitude: Longitude of the playback in 1984-WGS Date: Date of the playback (dd/mm/yyyy) Playback start: Time the two minute playback started, 24 hour clock Census finish: Time listening for responses terminated, 24 hour clock. Time spent listening varied, depending on responses, but a minimum of 15 minutes was spent at each playback location. Direction of playback speaker: Compass direction (0-350) the playback speaker was facing to nearest 10 degrees. Distance speaker-observer: Distance in metres between the playback speaker and the observer. Direction of response: Compass direction (0-350) of loud call responses by titi monkey groups to nearest 10 degrees. If multiple groups responded to a playback, each group was entered in the dataset as a separate line. If no groups responded, recorded as NA. Initial distance of response: Estimated distance of titi monkey group when they started responded to the playback, measured in metres. If multiple groups responded to a playback, each group was entered in the dataset as a separate line. If no groups responded, recorded as NA.