Aquaculture in the 21st Century. Anita M. Kelly and Jeffrey Silverstein, eds. American Fisheries Society, Bethesda, MD, 2006. 643 pp., illus. $69.00 (ISBN 1888569719 paper).

Enhancing Participation and Governance in Water Resources Management: Conventional Approaches and Information Technology. Libor Jansky and Juha I. Uitto, eds. United Nations University Press, New York, 2006. 236 pp., illus. $32.00 (ISBN 9280811207 paper).

Environmental Leadership Equals Essential Leadership: Redefining Who Leads and How. John C. Gor-don and Joyce K. Berry. Yale University Press, New Haven, CT, 2006. 192 pp., illus. $22.00 (ISBN 0300108915 cloth).

Evolution and Ecology of the Organism. Michael R. Rose and Laurence D. Mueller. Prentice Hall, Upper Saddle River, NJ, 2006. 720 pp., illus. $115.33 (ISBN 0130104043 cloth).

The Evolving World: Evolution in Everyday Life. David P. Mindell. Harvard University Press, Cambridge, MA, 2006. 352 pp., illus. $24.95 (ISBN 0674021916 cloth).

Freshwater Fishes of Mexico. Robert Rush Miller. University of Chicago Press, Chicago, 2006. 652 pp., illus. $75.00 (ISBN 0226526046 cloth).

Handbook of Avian Hybrids of the World. Eugene M. McCarthy. Oxford University Press, New York, 2006. 598 pp., illus. $89.50 (ISBN 0195183231 cloth).

Pete Dunne's Essential Field Guide Companion: A Comprehensive Resource for Identifying North Amer-ican Birds. Peter Dunne. Houghton Mifflin, Boston, 2006. 720 pp. $28.00 (ISBN 0618236481 cloth).

Statistics Explained: An Introductory Guide for Life Scientists. Steve McKillup. Cambridge University Press, New York, 2006. 280 pp., illus. $29.99 (ISBN 0521543169 paper).

Variation:A Central Concept in Biology. Benedikt Hallgrímsson and Brian K. Hall, eds. Elsevier, Burlington, MA, 2005. 592 pp., illus. $74.95 (ISBN 0120887770 cloth).