Habitat compartmentation and environmental correlates of food chain length.

REFERENCES given preference. A considerable amount of 1 C. H. Greene, P. H. Wiebe, J. Burczynski, M. J. work by oceanographers and fishery scienYoungbluth, Science 241, 359 (1988). tists must be done before the role of krill in 2. E. S. Hobson, ibid. the Georges Bank food chain can be fully 3. J. D. Isaacs and R. A. Schwartzlose, ibid. 150, 1810 (1965); A. Genin, L. Haury, P. Greenblatt, Deepappreciated. Sea Res. 35, 151 (1988). CHARLES H. GREENE 4. G. W. Boehlert and A. Genin, in Sea Mounts, Islands, Ecosystems Research Center, and Atolls, B. H. Keating, P. Frycr, R. Bainza, Ecosystems ~~~~G. Boehlert, Eds. (American Geophysical Union, Corson Hall, Washington, DC, 1987), pp. 319-334. Cornell University, 5. C. S. Davis, in Georges Bank, R. H. Backus and D. W. Bourne, Eds. (MIT Press, Cambridge, MA, Ithaca, NY 14853 1987), pp. 256-267; K. Sherman et al., in ibid., pp. PETER H. WIEBE 268-282. Biolog Deparment, 6. T. R. Azarovitz and M. D. Grosslein, in ibid., pp. WoodsiHoleOceaographc I utiont, 315-346; B. E. Brown, in ibid., pp. 480-493. Woods Hole Oceanographic Institution, Woods Hole, MA 02543 9 September 1988; accepted 16 September 1988