(A) Still images from the videos that were used to track ants in colony 1 in high- (one chamber) and low-density (four chambers) environments. (B) Tracking data for all ants in colony 1. (C) Still …
Workers are labeled with numbers.
All colonies show a much higher average movement rate in the two middle chambers.
Higher values indicate that individuals slow down, whereas lower values suggest that ants accelerate. Some general patterns are maintained in all colonies, with potential surfaces pushing ants to …
(A) The colored columns depict the different spatial groups identified by the clustering algorithm in the high- and low-density treatments of colony 2. Low numbers represent a closer position to the …
Low numbers represent a closer position to the entrance. The gray lines between these groups indicate that the ants preferred to remain in a similar spatial position relative to each other when nest …
Each node represents an ant in the network with color indicating its spatial group. Foragers are marked with black circles. Groups are arranged in a circle and sorted numerically on the basis of …
Each circle represents an interaction between two ants with color indicating spatial groups. Red, green and blue represent interactions within spatial groups 1, 2 and 3, respectively. Interactions …
For each group, we plotted every location of every ant in the group over the 4 hr period. Please note that there are three groups during the high-density period and only two groups during the low-den…
For each group, we plotted every location of every ant in the group over the 4 hr period.
For each group, we plotted every location of every ant in the group over the 4 hr period.
The values shown are the percent change in average rate of trophallaxis events when one additional ant is present at different distance lags. For all colonies, additional ants within 10 mm correlate …
(A) Overview of the foraging arena. (B) Camera box with side wall removed to show inner parts. (C) Worker walking over twine. Photos by Christoph Kurze.
Ants are represented as circles with their identity (numbers identify workers, ‘Q’ represents the queen). Food sharing is visualized as a red line between two individuals. Circle color indicates …
Total sample size is 86,406. 14,401 observation points (one observation per second) per treatment and colony (14,401 × 2×3=86,406). CL, confidence limit.
Level of effect | Estimate | Standard error | Wald stat. | Lower CL 95% | Upper CL 95% | p-value | |
---|---|---|---|---|---|---|---|
Intercept | −3.30 | 0.02 | 33538.95 | −3.34 | −3.27 | <0.0001 | |
Colony | 1 | 0.04 | 0.03 | 1.97 | −0.01 | 0.08 | 0.16 |
Colony | 2 | −0.23 | 0.03 | 71.58 | −0.28 | −0.18 | <0.0001 |
Treatment | High | −0.11 | 0.02 | 36.34 | −0.14 | −0.07 | <0.0001 |
Colony*Treatment | 1 | 0.01 | 0.03 | 0.12 | −0.04 | 0.06 | 0.73 |
Colony*Treatment | 2 | −0.16 | 0.03 | 36.86 | −0.22 | −0.11 | <0.0001 |
R code for the pairwise comparison of the interaction terms colony by treatment presented in Table 1—source data 2.
The source data for the results presented in Table 1 and Table 1—source data 2.
Pairwise comparison of the colony by treatment interaction terms presented in Table 1.
We modeled trophallaxis initiations for each pair as coming from an inhomogeneous Poisson point process, where the rate of trophallaxis initiations depends on colony and local-density effects. We …
Estimate | Standard error | Z-value | p-value | |
---|---|---|---|---|
Colony 1 | −5.80 | 0.07 | −82.25 | <2e-16 |
Colony 2 | −6.04 | 0.09 | −69.18 | <2e-16 |
Colony 3 | −8.59 | 0.29 | −30.04 | <2e-16 |
Treatment | −0.49 | 0.04 | −11.11 | <2e-16 |
n5 | 0.18 | 0.04 | 4.08 | 4.60e-05 |
n10 | 0.05 | 0.02 | 2.08 | 0.04 |
n15 | −0.41 | 0.03 | −15.01 | <2e-16 |
n20 | −0.26 | 0.02 | −10.57 | <2e-16 |
col2:n5 | −0.04 | 0.07 | −0.62 | 0.5335 |
col3:n5 | 0.40 | 0.07 | 5.98 | 2.30e-09 |
col2:n10 | −0.03 | 0.04 | −0.69 | 0.49 |
col2:n15 | 0.08 | 0.04 | 1.77 | 0.08 |
col3:n15 | 0.19 | 0.03 | 5.84 | 5.29e-09 |
col2:n20 | −0.002 | 0.04 | −0.06 | 0.96 |
col3:n20 | 0.07 | 0.03 | 2.14 | 0.03 |