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Science 7 March 1980:
Vol. 207. no. 4435, pp. 1099 - 1100
DOI: 10.1126/science.207.4435.1099
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Articles

Army Ants on the Move: Relation Between Food Supply and Emigration Frequency

HOWARD TOPOFF 1 and JOHN MIRENDA 1

1 Animal Behavior-Biopsychology Program, Hunter College of City University of New York, New York 10021, and American Museum of Natural History, New York 10024

Underfed colonies of Neivamyrmex nigrescens in the laboratory emigrated on 62 percent of the nomadic days, as compared with only 28 percent for overfed colonies. Because the emigration frequency in the field is similar to that of underfed colonies, nomadic raids may not bring in enough food to satiate the larval broods. Since emigrations take time away from raiding, the food-related mechanism underlying emigrations may have evolved under more stringent ecological conditions.

Submitted on September 26, 1979
Revised on December 6, 1979

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Science. ISSN 0036-8075 (print), 1095-9203 (online)