13 February 1998
Vol 279, Issue 5353

About The Cover

Gypsy moth outbreaks and Lyme disease are major problems in eastern U.S. forests. The abundance of gypsy moths and the tick vectors of Lyme disease are determined by an ecological chain reaction. Acorn production determines the abundance of white-footed mice and deer. Abundant mice suppress gypsy moth outbreaks, and mice and deer support tick populations, potentially increasing the risk of Lyme disease. See 1023 and the News story on 984. [Photos: deer, R. J. Winchcombe; acorns, M. Adhean. Collage: P. Morrighan]