1. Trophic aspects of caste determination in Halictus ligatus, a primitively eusocial sweat bee

   • Miriam H. Richards
   • Laurence Packer

   OriginalPaper Pages: 385 - 391

2. Effects of predation risk and hunger on the behaviour of two species of tadpoles

   • Peter Horat
   • Raymond D. Semlitsch

   OriginalPaper Pages: 393 - 401

3. Paternity in naturally-occurring Utetheisa ornatrix (Lepidoptera : Arctiidae) as estimated using enzyme polymorphism

   • Craig W. LaMunyon

   OriginalPaper Pages: 403 - 408

4. Behavioral and life-history components of division of labor in honey bees (Apis mellifera L.)

   • Ernesto Guzmán-Novoa
   • Robert E. Page Jr.
   • Norman E. Gary

   OriginalPaper Pages: 117 - 409

5. New birds on the block: new neighbors increase defensive costs for territorial male willow ptarmigan

   • Perri Eason
   • S. J. Hannon

   OriginalPaper Pages: 419 - 426

6. Resource-holding power asymmetries, the prior residence effect, and reproductive payoffs in male northern elephant seal fights

   • Michael P. Haley

   OriginalPaper Pages: 427 - 434

7. Operational sex ratios and behavioural sex differences in a pipefish population

   • Amanda Vincent
   • Ingrid Ahnesjö
   • Anders Berglund

   OriginalPaper Pages: 142 - 435

8. Sexual selection and the evolutionary effects of copying mate choice

   • Mark Kirkpatrick
   • Lee Alan Dugatkin

   OriginalPaper Pages: 443 - 449

9. Uganda kob mating success does not increase on larger leks

   • James C. Deutsch

   OriginalPaper Pages: 451 - 459