Figure 2.

Social networks and TB transmission in a meerkat group. Comparative networks of (a) grooming and (b) aggressive interactions over a three-month period are shown. Each node (circle) represents a meerkat; node size is proportional to outdegree centrality (an indication of how much interaction each individual initiated). Arrowhead size is proportional to frequency of interactions, thus the sum of arrowheads around each node gives an indication of indegree centrality (the relative amount of interaction received by that meerkat). Asterisks indicate the three individuals that became TB test-positive during the time period for which the interaction data are shown. Meerkats are arranged in descending order of age from top to bottom of each diagram. White nodes, females; grey nodes, males; D, dominant individuals.