https://doi.org/10.5061/dryad.31zcrjdt8

Three data files were used to analyze variable intergroup encounter types in wild blue monkeys, including data on encounter rates, encounter types, and group behavior during encounters.

Description of the data and file structure

This submission includes 3 data files:

(1) In "Datafile_1_Rate_data.csv", each line of data represents a particular group in a particular study month. We include a rate variable, based on the monthly sum of intergroup encounters recorded relative to total group observation time in that same month. This and other variables in this data set are described below.

(2) In "Datafile_2_Encounter_data.csv", each line of data represents a single intergroup encounter, classified as intolerant or neutral. This and other variables in this data set are described below.

(3) In "Datafile_3_Group_behaviour_data.csv", each line of data represents one study group in one encounter, with its behavior categorized as aggressive, fleeing, or neutral. This and other variables in this data set are described below.

The three data files are all based on the same field records. Nearly all encounters included in Datafiles 1 and 2 contributed information to Datafile 3, but there were some exceptions: specifically, in a few cases, field records were not sufficiently complete to allow us to categorize opposing groups' behavior, and these encounters were therefore not included in Datafile 3. 

Below are descriptions of the data fields (columns) in each of the data files. In all data files, missing values are denoted with the entry "null".

Cords-Thurau_Datafile_1 _Rate_data.csv 

• Each line of data represents one group in one month.
• Columns 1 and 2 indicate month and group respectively.
• Column 3 “hours” shows number of observation hours for that group-month combination.
• Columns 4-6 show respectively the counts of neutral intergroup encounters (IGEs), intolerant IGEs and total IGEs for the group-month combination.
• Columns 7-9 show respectively the rates of neutral, intolerant and total IGEs (count per 100 hours of group observation time)
• Column 10 (“zFAI”) shows standardized Fruit Availability Index for each group-month. This index derives from combining (1) monthly mean fruit abundance scores (0-4) of 29 food tree species with (2) vegetation survey data specific to each home range, measuring tree basal area (m2 per transect, where transects measured 10 x 100 m2), as described in Methods and in the manuscript. zFAI values were standardized separately for each group using mean and standard deviation of FAI values for that group across the months in which it was observed.

Cords-Thurau_Datafile_2_Encounter_data.csv

• Each line of data represents one IGE (intergroup encounter).
• Column 1 “date” shows date of IGE.
• Columns 2-3 show focal group and opposing group participating in the IGE.
• Column 4 (“grp-dyad”) represents the group dyad identity. If either group here is identified as “UID” (unidentified, meaning a non-study group), this row of data was excluded from the subset of data that represented only study groups in which we knew the years in which two study groups fissioned. 
• Columns 5-shows whether an intergroup encounter was intolerant (coded as 0 for “no” and 1 for “yes”).
• Columns 6-7 (“zFAI”) show standardized Fruit Availability Index for each group-month. “zFAI_Focal” shows the standardized FAI for the focal group while “zFAI_Opp” shows the standardized FAI for the opposing group. This index derives from combining (1) monthly mean fruit abundance scores (0-4) of 29 food tree species with (2) vegetation survey data specific to each home range, measuring tree basal area (m2 per transect, where transects measured 10 x 100 m2), as described in the manuscript. zFAI values were standardized separately for each group using mean and standard deviation of FAI values for that group across the months in which it was observed.
• Column 8 (“zFAI_avg”) shows the average of columns 6 and 7, i.e., the average zFAI of the focal and opposing groups.
• Column 9 (“time”) shows the time of day in which the IGE occurred, binned into 3 levels: midday (1100-1300 hrs), near midday (0900-1100 hrs and 1300-1500 hrs) and beginning/end of day (0700-0900 hrs and 1500-1700 hrs).
• Columns 10 and 11 show the proportion of adult females that had infants, averaged over the month, in the focal and opposing groups respectively.
• Column 12 (“avg_af_w_inf”) shows the average of columns 10 and 11, i.e.  the average proportion of adult females that had infants across the focal and opposing groups.
• Column 13 (“yrs_since_split”) shows the number of years that had passed since the two opposing groups had been in one group together, i.e., the year of the intergroup encounter minus the year in which a common progenitor group had fissioned, producing the two opposing groups.
• Column 14 (“grpsize_diff”) shows the absolute value of the difference in the number of adult females in focal vs. opposing groups.
• Columns 15-16 show the edge score assigned to the specific IGE location (50m x 50 m quadrat) for the focal and opposing groups respectively. Edge scores are 0 at the edge of the home range, positive in the interior, and negative outside the home range. Edge scores can take a non-integer value if the encounter location was specified to two quadrats. See manuscript for further detail.
• Column 17 (“edge_disparity”) shows the absolute value of the difference between the edge scores of focal and opposing groups.

Cords-Thurau_Datafile_3_Group_behavior_data.csv

• Each line of data represents a single group’s behavior during an intergroup encounter (IGE)
• Column 1 “date” shows date of IGE.
• Columns 2-3 show focal group and opposing group participating in the encounter.
• Column 4 represents focal group’s behavior in the encounter, classified as “agg” if any group members threatened, chased, or grappled with the opponent group, “flee” if the group fled from opponents without any members showing aggressive behavior, and “neutral” otherwise (neither aggressive behavior nor flight)..
• Column 5 (“zFAI_Focal”) shows the standardized Fruit Availability Index for the focal group in the month of the encounter. This index derives from combining (1) monthly mean fruit abundance scores (0-4) of 29 food tree species with (2) vegetation survey data specific to each home range, measuring tree basal area (m2 per transect, where transects measured 10 x 100 m2), as described in the manuscript. zFAI values were standardized separately for each group using its mean and standard deviation across the months in which it was observed.
• Column 6 (“focal_af”) shows the number of adult females in the focal group.
• Column 7 (“prop_af_w_inf_focal”) shows the proportion of adult females in the focal group that had infants.
• Column 8 (“af_diff_foc_opp”) shows the difference in the number of adult females in focal vs. opposing groups, calculated as N-focal minus N-opponent. Can take negative values if the focal group is outnumbered.

• Column 9 (“time”) shows the time of day in which the IGE occurred, binned into 3 levels:

  • A1: beginning/end of day (0700-0900 hrs and 1500-1700 hrs)
  • A2: near midday (0900-1100 hrs)
  • A3: midday (1100-1300 hrs)

• Column 10 (“focal_edge”) shows the ‘edge score’ assigned to the specific IGE location (50m x 50 m quadrat) for the focal group. Edge scores are 0 at the edge of the home range, positive in the interior, and negative outside the home range. Edge scores can take a non-integer value if the encounter location was specified to two quadrats. See manuscript for further detail.

• Column 11 (“yrs_since_split”) shows the number of years that had elapsed since the two opposing groups had been together as members of single group, i.e., the year of the intergroup encounter minus the year in which a common progenitor group had fissioned, producing the two opposing groups.