James C. Ha

Behavioral Ecology and Foraging Behavior of Corvids,

(and a few other birds)

Publications and Presentations

Publications

  1. Ha, J.C., P.N. Lehner and S.D. Farley. 1990. Risk-prone foraging behavior in captive gray jays (Perisoreus canadensis). Anim. Behav. 39:91-96.

  2. Ha, J.C. and P.N. Lehner. 1990. Notes on gray jay demographics in Colorado. Wilson Bull. 102:698-702.

  3. Ha, J.C. 1991. Risk-sensitive foraging: the role of ambient temperature and foraging time. Anim. Behav. 41:528-529.

  4. Luhring, K.A., J.C. Ha and P.N. Lehner. 1992. Agonistic displays of the gray jay (Perisoreus canadensis): a comparison with other corvids. Northwestern Naturalist 73:22- 24.

  5. Robinette, R.L. and J.C. Ha. 1997. The significance of fishing behavior by Northwestern crows. Wilson Bulletin 109:748-749.

  6. Robinette, R.L. and J.C. Ha. 2000. Beach-foraging behavior of Northwestern crows as a function of tide height. Northwestern Naturalist 81:18-21.

  7. Robinette, R.L. and J.C. Ha. 2001. Social and ecological factors influencing vigilance by Northwestern crows (Corvus caurinus).  Animal Behaviour 62:447-452.

  8. Robinette, R.L., P. Bentzen, J.L. Marsh and J.C. Ha.  2003.  Kin discrimination in food stealing by Northwestern Crows (Corvus caurinus).  Bird Behavior 15: 65-75.

  9. Ha, R.R. and J.C. Ha.  2003.  Effects of prey type, prey density and energy requirements on the use of alternative foraging tactics in crows.  Animal Behaviour 66: 309-316.

  10. Agness, A.M., J.F. Piatt, J.C. Ha, and G.R. VanBlaricom.  2007.  Effects of vessel activity on the near shore ecology of the Kittlitz’s murrelet (Brachyramphus brevirostris) in Glacier Bay, Alaska.  Accepted, Auk.

Scientific Presentations

  1. Ha, J.C., S.D. Farley and P.N. Lehner. 1987. Gray jay (Perisoreus canadensis) responses to changes in food density within a closed economy laboratory simulation: temporal patterns and risk sensitivity. Annual meeting of the Animal Behavior Society, June 21-26, 1987.

  2. Ha, J.C. 1988. Foraging behavior in captive gray jays (Perisoreus canadensis): response to altered foraging time and metabolic requirements. Annual meeting of the Animal Behavior Society, August 7-12, 1988.

  3. Luhring, K.A., P.N. Lehner and J.C. Ha. 1988. Agonistic behavior in gray jays (Perisoreus canadensis): a comparison to other corvids. Annual meeting of the Animal Behavior Society, August 7-12, 1988.

  4. Ha, J.C. and P.N. Lehner. 1990. Survivorship, movements, and group composition of gray jays in Colorado. Annual meeting of the Animal Behavior Society, June 11- 15, 1990.

  5. Ha, J.C. and A. Cepaitis. 1991. The role of harmonic and arithmetic means in risk- sensitive foraging by gray jays (Perisoreus canadensis). Annual meeting of the Animal Behavior Society, June 1-6, 1991.

  6. Ha, J.C. and S.J. Ha. 1995. Significant differences in call structure among Pacific Northwest crow populations. Annual meeting of the Animal Behavior Society, July 8-13, 1995.

  7. Robinette, R. and J.C. Ha. 1995. Beach foraging behavior of American crows as a function of tide height. Annual meeting of the Animal Behavior Society, July 8-13, 1995.

  8. Robinette, R. and J.C. Ha. 1996. The relationship between tide height, prey density, foraging efficiency in beach-foraging American crows. Annual meeting of the Animal Behavior Society, August 3-9, 1996.

  9. Ha, J.C. and R.L. Robinette. 1997. Beach foraging crows I: Ecological and behavioral determinants of patch departure. Annual meeting of the Animal Behavior Society, June 21-26, 1997.

  10. Robinette, R.L. and J.C. Ha. 1997. Beach foraging crows II: Social foraging. Annual meeting of the Animal Behavior Society, June 21-26, 1997.

  11. Robinette, R.L. and J.C. Ha. 1998. Evidence for multiple factors influencing vigilance. Annual meeting of the Animal Behavior Society, July 18-22, 1998. WINNER: 1998 Founders' Memorial Poster Award

  12. Robinette, R.L. and J.C. Ha. 1998. Successful scrounging by beach-foraging Northwestern Crows (Corvus caurinus). Foraging/98: Nervous Systems to Ecosystems, July 21-24, 1998.

  13. Colon, M., J.C. Ha, and R.R. Ha.  2006.  Relationships of forest birds on Rota, Mariana Islands.  North American Ornithological Conference, Veracruz Mexico, October 30, 2006.

  14. Ha, RR., J. Ha, L. Berry, and J. Morton.  2007. Nest site selection in the endangered Mariana crow. Annual meeting of the Animal Behavior Society, July 21-25, 2007.