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Fig. 1. Trail direction ratio (TDR; see text) as a function of temperature at ant
height (4 mm) in a foraging trail of a Messor pergandei colony.
Filled circles: data from E-day; Landers earthquake and subsequent
aftershocks. The earthquake struck at the lowest temperature (05:58 h, 28
June, 1992). Temperature is a primary determinant of ant behavior, and also
serves to separate data points in time; higher temperatures correspond to
later times on all days. Other symbols: control days, all recordings starting
at approximately the same time as on E-day. Empty squares, 29 June 1992;
filled squares, 2 July 1992; crosses, 3 July 1992. Testing the null hypothesis
by ANCOVA (slopes equal) yielded P>0.2. The common slope is
0.0142. Testing the null hypothesis (intercepts equal) yielded
P>0.15. The common intercept is 0.138. The regression line for
E-day is third from the top.
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