Barlow, G. W. 1974. Extraspecific imposition of social grouping among surgeonfishes (Pisces: Acanthuridae). Journal of Zoology 174:333–340. Borgia, G. 1980. Sexual competition in Scatophaga stercoraria: size‐ and density‐related changes in male ability to capture females. Behaviour 75:185–206. Brown, J. L. 1964. The evolution of diversity in avian territory systems. Wilson Bulletin 76:160–169. Chapman, M. R., and D. L. Kramer. 1996. Guarded resources: the effect of intruder number on the tactics and success of defenders and intruders. Animal Behaviour 52:83–94. Dubois, F., L.‐A. Giraldeau, and J. W. A. Grant. 2003. Resource defense in a group‐foraging context. Behavioral Ecology 14:2–9. Emlen, S. T., and L. W. Oring. 1977. Ecology, sexual selection, and the evolution of mating systems. Science 197:215–223. Enquist, M., E. Plane, and J. Röed. 1985. Aggressive communication in fulmars (Fulmarus glacialis) competing for food. Animal Behaviour 33:1007–1020. Enquist, M., O. Leimar, T. Ljungberg, Y. Mallner, and N. Segerdahl. 1990. A test of the sequential assessment game: fighting in the cichlid fish Nannacara anomala. Animal Behaviour 40:1–14. Foster, S. A. 1985. Group foraging by a coral reef fish: a mechansim for gaining access to defended resources. Animal Behaviour 33:782–792. Giraldeau, L.‐A., and T. Caraco. 2000. Social foraging theory. Princeton University Press, Princeton, N.J. Grant, J. W. A. 1993. Whether or not to defend? the influence of resource distribution. Marine Behaviour and Physiology 23:137–153. Grant, J. W. A., M. J. Bryant, and C. E. Soos. 1995. Operational sex ratio, mediated by synchrony of female arrival, alters the variance of male mating success in Japanese medaka. Animal Behaviour 49:367–375. Grant, J. W. A., C. L. Gaboury, and H. L. Levitt. 2000. Competitor‐to‐resource ratio, a general formulation of operational sex ratio, as a predictor of competitive aggression in Japanese medaka (Pisces: Oryziidae). Behavioral Ecology 11:670–675. Gross, M. R. 1984. Sunfish, salmon, and the evolution of alternative reproductive strategies and tactics in fishes. Pages 55–75 in G. Potts and R. Wootton, eds. Fish reproduction: strategies and tactics. Academic Press, London. ———. 1996. Alternative reproductive strategies and tactics: diversity within sexes. Trends in Ecology & Evolution 11:92–98. Hamilton, I. M., and L. M. Dill. 2002. Three‐player social parasitism games: implications for resource defense and group formation. American Naturalist 159:670–686. ———. 2003a. Group foraging by a kleptoparasitic fish: a strong inference test of social foraging models. Ecology 84:3349–3359. ———. 2003b. The use of territorial gardening versus kleptoparasitism by a subtropical reef fish (Kyphosus cornelii) is influenced by territory defendability. Behavioral Ecology 14:561–568. Hutchings, J. A., and R. A. Myers. 1987. Escalation of an asymmetric contest: mortality resulting from mate competition in Atlantic salmon, Salmo salar. Canadian Journal of Zoology 65:766–768. ———. 1988. Mating success of alternative maturation phenotypes in male Atlantic salmon, Salmo salar. Oecologia (Berlin) 75:169–174. Martel, G., and L. M. Dill. 1995. Influence of movement by coho salmon (Oncorhynchus kisutch) on their detection by common mergansers (Mergus merganser). Ethology 99:139–149. Marzluff, J. M., and B. Heinrich. 1991. Foraging by common ravens in the presence and absence of territory holders: an experimental analysis of social foraging. Animal Behaviour 42:755–770. Maynard Smith, J., and G. R. Price. 1973. The logic of animal conflict. Nature 246:15–18. Myers, J. P., P. G. Connors, and F. A. Pitelka. 1981. Optimal territory size and the sanderling: compromises in a variable environment. Pages 135–158 in A. C. Kamil and T. D. Sargent, eds. Foraging behavior. Garland, New York. Östlund‐Nilsson, S. 2002. Does paternity or parental investment determine the level of parental care and does female choice explain egg stealing in the fifteen‐spined stickleback? Behavioral Ecology 13:188–192. Puckett, K. J., and L. M. Dill. 1985. The energetics of feeding territoriality in juvenile coho salmon (Oncorhynchus kisutch). Behaviour 92:97–111. Repka, J., and M. R. Gross. 1995. The evolutionarily stable strategy under individual condition and tactic frequency. Journal of Theoretical Biology 176:27–31. Sirot, E. 2000. An evolutionarily stable strategy for aggressiveness in feeding groups. Behavioral Ecology 11:351–356. Vickery, W. L., L.‐A. Giraldeau, J. J. Templeton, D. L. Kramer, and C. A. Chapman. 1991. Producers, scroungers, and group foraging. American Naturalist 137:847–863. Wilson, E. O. 1975. Sociobiology: the new synthesis. Harvard University Press, Cambridge, Mass.